Advances in Civil Engineering

Advances in Civil Engineering / 2018 / Article

Research Article | Open Access

Volume 2018 |Article ID 8980756 | 11 pages |

Finite Element Model Updating in Bridge Structures Using Kriging Model and Latin Hypercube Sampling Method

Academic Editor: Filippo Ubertini
Received07 Sep 2018
Revised19 Nov 2018
Accepted24 Nov 2018
Published11 Dec 2018


Computational cost reduction and best model updating method seeking are the key issues during model updating for different kinds of bridges. This paper presents a combined method, Kriging model and Latin hypercube sampling method, for finite element (FE) model updating. For FE model updating, the Kriging model is serving as a surrogate model, and it is a linear unbiased minimum variance estimation to the known data in a region which have similar features. To predict the relationship between the structural parameters and responses, samples are preselected, and then Latin hypercube sampling (LHS) method is applied. To verify the proposed algorithm, a truss bridge and an arch bridge are analyzed. Compared to the predicted results obtained by using a genetic algorithm, the proposed method can reduce the computational time without losing the accuracy.

1. Introduction

Bridge structures are playing important roles in our lives for supporting essential social and economic functionalities. However, they are potentially prone to damage due to significant loads during their service lives. For this reason, structural health monitoring (SHM) technologies have been deeply studied with the goal to monitor the conditions of the bridges and detect the damages as well as assess their conditions [1]. As a result, high accuracy FE models of bridges are often critical to structural condition evaluations. However, the initial FE model is established based on the design drawings which does not take environmental effects and other unexpected conditions into consideration, thus some inevitable differences occur, and modelling errors always exist in FE models. While there are many methods proposed to accommodate the errors, it is critical to reduce modelling errors through FE model updating by calibrating structural model parameters based on measured data [2].

For a long time, algorithm development for FE model updating is a hot research area in SHM, and the goal of FE model updating is to minimize the discrepancies between measured data of a real structure and FE model [3]. Until now, FE model updating methods can be divided into two groups. One is called the direct method, which updates the elements of mass and stiffness matrix. The other is the iteration method, which updates the structural parameters iteratively to minimize the differences between the measured data and the analytical response values. For the direct method, the updated mass or stiffness matrixes usually lose the sparse character, and some elements do not maintain corresponding physical meaning [4]. In order to overcome the drawbacks, many researchers proposed different methods. Kabe [5] used the structural connective information to optimally adjust deficient stiffness matrices and obtained the excellent results. By utilizing the added known masses, new mass and stiffness updating algorithms were proposed by Cha and Gu [6]. Their method preserved the physical configuration of the analytical model and reduced the computational efforts. Minas and Inman [7] used an eigenstructure assignment algorithm to calculate corrections by the FE model, and the results from an updated FE model agreed with experimental data. Based on the development of a new symmetric eigenstructure assignment method, Zimmerman and Widengren [8] used the incorporated measured experimental modal data to update an FE model. However, the mentioned methods have the limitation that the updated structural matrices cannot feedback to the general FE model software. Compared to the direct method, parametric methods are widely used by selecting specific parameters to update the FE model to obtain the minimum error between the updated model and experimental data.

For complex structures, such as cable-stayed bridges, suspension bridges, and the other composite bridges, the number of nodes, elements, materials, and boundary conditions are complex.

It is still an issue to obtain accurate results with less computational time. To achieve high computational efficiency, some studies on substructure methods are accounted for truncation approximation method proposed by Weng et al. [9]. The improved computation efficiency of the method was verified by a frame structure and a practical bridge with the lowest eigensolutions of substructures. However, this kind of method lacks principles for substructure division, which affects the results of the updated FE model. Then, the focus of researchers turned to the surrogate model method, which considers the regression analysis and experiment design. It established the explicit function to model the relationship between the structural responses and the parameters of structures and then applied the explicit function to the FE model to get the analytical data [10]. Marwala [11] proposed the response surface method for FE model updating, using genetic algorithm (GA) to optimize the selected parameters and verified the computational efficiency of the proposed method by an unsymmetrical H-shaped structure. By using response surface method, Ren and Chen [12] accounted for sampling with a design of experiments, selecting the significant updating parameters and constructing polynomial response surface, and then a novel method was proposed and its application to a full-size bridge had been demonstrated efficiently. Furthermore, Shan et al. [13] proposed an FE model updating method, which combined the substructure and response surface model updating method together. The proposed method was applied to a cable-suspension bridge, and the efficiency of the method was verified. As response surface method and its related methods are almost constructed on training samples which include input and output information of the system, researchers have been motivated to tackle the challenge from the perspective of the Kriging model. The theory of the Kriging model is based on a correlation function, which is an interpolation of the known data and can go through all the sampling points. Compared to traditional response surface method, the Kriging model has much higher approximation accuracy.

For exploring Kriging model updating in bridge structures, lots of researchers play important roles during the development of this method. In order to select the inputs to predict efficiently, Sacks et al. introduced the Kriging model, which originated from a statistical approach to mine valuation by a South African geologist Krige [14, 15]. Based on progressive lattice sampling, Romero et al. constructed several efficiently upgradable response surface approximations. Compared to other interpolation schemes, the Kriging model almost performed best [16]. Zhang and Au [17] applied the Kriging model in initial cable forces calibration, and the advantages of feasibility and accuracy of the Kriging model were verified. To balance the accuracy and efficiency of implementing reliability analysis, Zhang et al. [18] proposed an advanced Kriging method to combine with simple random sampling method and leave-one-out technique as well as Monte Carlo simulation method, and the accuracy and efficiency of the proposed method were verified through some engineering examples. Huang et al. [19] proposed an active learning method which combined the Kriging model and subset simulation to do small failure probability assessment. By applying the proposed method to several benchmark functions, the advantage of providing accurate solutions much more efficiently was demonstrated. Based on frequency response function, Wang et al. [20] updated the model with the Kriging model.

This paper uses the Kriging model updating for a truss bridge and an arch bridge. The training points for the Kriging model are obtained by Latin hypercube Sampling (LHS) instead of the design of an experiment. For these the two cases, the acceleration data were measured and used for optimization. LHS is applied to produce training samples. Compared to genetic algorithm (GA), the model updating results of two cases showed that the proposed method has significant improvement to reduce the calculation time without losing the accuracy.

2. Methodology

2.1. Kriging Model

The Kriging model was proposed by a geologist D. G. Krige. When applied it as a surrogate model, the response function consists of two parts. One is a regression model , and the other is stochastic process [2123]:where is the trend function which consists of a vector of regression function. is the corresponding vector of unknown regression coefficients, and is the number of . The term is the realization of a stochastic process with zero mean, variance, and nonzero covariance. The covariance matrix of can be described aswhere denotes the number of the experiment points. is the correlation function between and and defined by its set of parameters [22, 24]. The correlation function needs to be selected by users. In this paper, is defined by Gaussian spatial correlation function [25, 26]:where is unknown correlation parameter utilized to fit the model [27] and and are the components of sample points and .

In the Kriging model, the values of , , and are determined by maximizing the likelihood function. First, is obtained by minimizing the concentrated log-likelihood function as [28]

and can be estimated as [29]

Then, the prediction value for the response at an untried value of can be obtained aswhere is the estimated value of , is the correlation vector evaluated at , and is the vector or responses to the sample locations [30].

Above equation is equivalent to the minimum optimization problem:

Finally, can be obtained, and the Kriging model can be also constructed.

2.2. Latin Hypercube Sampling Method

For FE model updating, one key issue is to obtain several sample points. The sampling methods mainly can be classified as simple random sampling (SRS), stratified sampling method, cluster sampling method, and systematic sampling. For SRS, it is an unbiased surveying technique and a subset of individuals chosen from a large set [31]. For stratified sampling, it is a method of sampling from a population [32]. Cluster sampling is a sampling plan used when mutually homogeneous, yet internally heterogeneous groupings are evident in a statistical population and often used in marketing research [33]. Systematic sampling is a statistical method involving the selection of elements from an ordered sampling frame [34]. SRS is a basic type of sampling since it can be a component of other more complicated sampling methods. However, when a complete sampling frame is not available or not much information about the population is available, SRS is not a good choice. In this case, stratified sampling may be a better choice.

Latin hypercube sampling (LHS) is a stratified sampling technique proposed by Mckay et al. [35]. It was developed by W. J. Conover in the summer of 1975 when he was a consultant. It was further elaborated by Iman et al. in 1981 [36]. It has been widely used in many fields, such as risk assessment, hurricane loss modelling, nuclear power safety assessment, and manufacturing equipment reliability analyses [37].

In LHS, it must be decided how many sample points are to be used, and for each sample point, it is important to remember in which row and column the sample point was taken. LHS can ensure that the ensemble of random numbers is representative of the real variability whereas random sampling is just an ensemble of random numbers without any guarantees.

For LHS, it can take all the variation of input variables into consideration, just with a small number of runs. The total range of the input variables is ensured to be represented. For example, if we want to sample points in the dimensional vector space , it should be done as follows [38]:(1)Divide the interval of each dimension into nonoverlapping intervals, and each interval has equal probability (take a uniform distribution, and the intervals should have the equal size)(2)Sample randomly from a uniform distribution, a point in each interval in each dimension(3)Pair randomly (equal likely combinations) the points from each dimension

Figure 1 is prepared to show the advantage of LHS. In Figure 1, 10 samples of two random variables obtained by two methods are shown, one is simple random sampling (SRS), and the other is LHS method. It is easy to find that the results of LHS method are much more spread out and have no clustering effects compared to the result of SRS method.

3. Experimental Verifications

3.1. Experimental Verification of a Truss Bridge

In this example, we apply the Kriging model to a plane truss to do model updating [39]. The elevation view of the truss bridge is shown in Figure 2. All the members are steel tubes. The inner and outer diameter of each member is 5.4 cm and 8.5 cm, respectively. Initial elastic modulus is , initial mass density is , and Poisson’s ratio is 0.3.

In the literature [39], FE model updating is based on genetic algorithm (GA), and the Kriging model is applied to the structure. The procedure based on GA is given as follows, and a flowchart of the method is shown in Figure 3:(1)Establish the FE model through ANSYS [40] FE model analysis program. There are 28 nodes, each node has two degrees of freedom (DOF), with 53 DOFs in total.(2)Assume the damping ratio is 1% and excite the structure at node 3 with vertical excitation, and the excitation force is simulated with band-limited white noise (BLWN). The vertical acceleration response of each DOF of the structure was calculated by Newmark-beta time-history analysis method. Eigensystem realization algorithm (ERA) was applied to obtain the first sixth modal parameters.(3)The objective function is established and then optimized by GA. The number of populations is 100. Then, the updated results are shown in Table 1.

Mode numberTestLiterature [39]Error (%)Kriging modelError (%)


When applying the Kriging model to do model updating, the procedure is as follows, and the flowchart of the Kriging model is shown in Figure 4:(1)Set elastic modulus and density of the materials as design parameters. Assume these design parameters and follow normal distributions , where is the design value for the design parameters, which is the initial value; the standard deviation of variables is , and is the variation coefficient of design parameters.(2)According to the distribution range of each random variable, the initial training samples are obtained through LHS method, and the training samples can be ranged from 10 to 100.(3)With the training samples, the structural responses are obtained with the FE model, and then the mapping relation of input-output of the initial training samples is obtained.(4)The parameter in the Kriging model is optimized based on GA, and the Kriging model is established after the optimization.(5)Based on the Kriging model, the prediction is performed on the test samples to obtain the corresponding modal parameters.

The comparison optimization results between the GA method in the literature [39] and the Kriging model in this paper are shown in Table 1.

The frequencies of the first 3 modes from the Kriging model are better than that of the GA from the literature, and the errors for the first 6 modes are all below 2%. Based on the updated FE model, the updated design parameters are and .

3.2. Experimental Verification of a Tied-Arch Bridge

In this example, the FE model of a tied-arch bridge is taken as an object. This bridge is a long-span concrete-filled steel tubular continuous girder arch composite system bridge with the span length of 58.4 + 128.0 + 58.4 m (Figure 5). The beam is prestressed concrete structure. The arch rib is a concrete-filled steel tubular structure, which is designed as a dumbbell-shaped section with equal height, and the section height is 2.8 m. The arch rib chord and the plate of the bridge are filled with microexpansion concrete. The design vector height is 25.6 m, and the calculated span of the arch rib is 128 m. In total, there are 14 pairs of suspenders, and each of them is in the form of double sling with the uniform diameter (85 mm).

The ambient arbitrary vibration measurement was conducted on the bridge after the bridge construction and before its opening to the operation to obtain the eigenmodes (including natural frequencies, mode shapes, and damping ratios), which were very important parameters for health monitoring and malfunctioning diagnosis of bridges.

In order to obtain the vertical and lateral modal characteristics of the bridge, measuring points are arranged. For the vertical test of the girder, there are 28 sensors, and each of them is arranged on each boom of the girder. For the lateral test of the girder, 7 sensors are arranged, and each of them is placed at the boom of the downstream. For the test of arch rib, in total, 32 sensors are arranged, half for vertical test and the half for the lateral test. The sensors are placed at the position of lateral braces. The arrangement of measuring points is shown in Figure 6.

The space bar model of the bridge was established by ANSYS (Figure 7). The girder is simulated by the element beam 44, which can simulate the varying cross sections. Element beam 189 is used to simulate the arch rib, and element link 10 is used to simulate the hanger rod. For the arch rib brace and main arch, girder, and hanger rods, they are connected by rigid arm element.

By using the multiple reference DOF stabilization diagram algorithms based on NExT/ERA (M-NExT/ERA), the modal parameters (natural frequencies and mode shapes) of the bridge are identified. Through the comparison, the results are shown in Table 2.

Measured frequencyFEM frequencyError (%)PositionModal description

0.59110.489417.21Arch rib1st order symmetrical lateral bending
1.18041.032212.562nd order antisymmetrical lateral bending
1.83871.614512.193rd order symmetrical lateral bending
2.58832.309110.794th order antisymmetrical lateral bending
3.41362.934314.045th order symmetrical lateral bending
4.30123.800811.636th order antisymmetrical lateral bending
5.10214.537511.077th order symmetrical lateral bending

2.01432.0799−3.26Girder and arch rib1st order antisymmetrical vertical bending
2.93673.0691−4.512nd order symmetrical vertical bending
3.24993.5905−10.483rd order symmetrical vertical bending
3.82894.2221−10.274th order antisymmetrical vertical bending
4.79444.47136.745th order symmetrical vertical bending
4.95245.0990−2.966th order antisymmetrical vertical bending

3.97603.297917.05Girder1st order antisymmetrical lateral bending
4.62625.2794−14.122nd order symmetrical lateral bending

4.45074.6486−4.45Arch rib1st order torsional
5.48515.5923−1.952nd order torsional

According to the structural design parameters given in the design drawings, the FE model was established to obtain the original natural frequencies and mode shapes of the bridge. By comparing the results between initial FE model and the experimental results (Table 2), it is obvious to find that for the initial model, in the 17th model, almost 65% of their natural frequency errors exceeded 10%, indicating that there is a big difference between the initial FE model and the real structure.

As the initial FE model cannot show the responses of the real structure, in order to ensure the accuracy of the prediction and analysis of the FE model, model updating is necessary. For this arch bridge, the Kriging model and GA are applied.

In the FE model updating, there are many candidate parameters that could be used to produce the required change. One way is to allow all the parameters to take part in the updating procedure, which could lead to expensive computational expense. The other is to select a certain number of updating parameters based on the sensitivity. Then, how to select updating parameters and how many should be selected become important issues. Referred to the literature [10], in this engineering project, the FE model updated parameters are as follows:(1)Arch rib-concrete: elastic modulus (), density ();(2)Arch rib-steel tube: elastic modulus (), density ();(3)Hanger rod: elastic modulus (), density ();(4)Girder-concrete: elastic modulus (), density ();(5)Wind support rigid arm: elastic modulus ();(6)Hanger rod rigid arm: elastic modulus ();(7)Secondary dead load ().

Based on the selected parameters, the two updating methods can be applied.

As mentioned above, the Kriging model is a learning theory which is based on small sample statistical learning and forecasting and is regarded as the best optimizing linear unbiased estimate method. Without affecting the accuracy of the results, the time of calculation and analysis is reduced, and the computational efficiency is improved. To apply the Kriging model, firstly, take 100 sets of parameters as the design variables, and then substitute them to the FE model to obtain 100 sets of results. Secondly, take the first two or three corresponding natural frequencies of the arch rib lateral mode, arch rib vertical mode, girder lateral mode, and arch rib torsional mode as training samples. Then, based on the obtained four groups of modified design parameters, the corresponding weight values are assigned according to the accuracy of the modified results, and the final update results are obtained. The weight coefficient is a random number with the sum of 1 and is distributed according to the accuracy.

When applying genetic algorithm (GA), assume the design parameters obey uniform distributions , where is the value of the design parameter and is the variation coefficient of the design parameters (same as the Kriging model). In order to obtain the updated parameters, firstly, establish the interface between ANSYS and MATLAB. Then, generate the design parameters within a range of specified variables, and the natural frequencies and mode shapes are obtained by substituting the generated design parameters into the FE model. The results show that the order of mode shapes changes with the change of design parameters.

By using the Kriging model and GA, the updated parameters are listed in Table 3.

Design parameterInitial modelKriging modelGAVariation coefficient (%)

Ec1 (Pa)3.45E + 103.51E + 103.76E + 1010
ρc1 (kgm−3)2600.002394.302537.3010
Es1 (Pa)2.06E + 112.47E + 12.58E + 115
ρs1 (kgm−3)7800.007992.407794.805
Es2 (Pa)1.96E + 112.10E + 111.99E + 115
ρs2 (kgm−3)7800.007738.207661.605
Eg1 (Pa)1.50E + 141.81E + 141.71E + 1410
Ec2 (Pa)3.45E + 103.41E + 103.25E + 1010
ρc2 (kgm−3)2600.002850.902603.0010
Eg2 (Pa)1.50E + 141.98E + 141.83E + 1410
F (N)1.45E + 061.35E + 061.45E + 068

Based on the updated parameters, the updated natural frequencies and mode shapes are also obtained. The specific results are shown in Table 4.

Measured frequencyFEM frequencyError (%)Kriging modelGAPositionModal description

0.59110.489417.210.53690.5408Arch rib1st order symmetrical lateral bending
1.18041.032212.561.13071.13802nd order antisymmetrical lateral bending
1.83871.614512.191.76641.78053rd order symmetrical lateral bending
2.58832.309110.792.52282.54454th order antisymmetrical lateral bending
3.41362.934314.043.19783.23065th order symmetrical lateral bending
4.30123.800811.634.13384.17536th order antisymmetrical lateral bending
5.10214.537511.074.92154.97647th order symmetrical lateral bending

2.01432.0799−3.262.03502.0455Girder and arch rib1st order antisymmetrical vertical bending
2.93673.0691−4.512.97303.00572nd order symmetrical vertical bending
3.24993.5905−10.483.43773.49423rd order symmetrical vertical bending
3.82894.2221−10.274.14274.18154th order antisymmetrical vertical bending
4.79444.47136.744.40204.42825th order symmetrical vertical bending
4.95245.0990−2.965.25735.16146th order antisymmetrical vertical bending

3.97603.297917.053.76373.8466Girder1st order antisymmetrical lateral bending
4.62625.2794−14.125.02665.13182nd order symmetrical lateral bending

4.45074.6486−4.454.85884.8203Arch rib1st order torsional
5.48515.5923−1.955.96175.83062nd order torsional

In order to show the high correlation of mode shapes between the measurement and FE model, for the simplicity of calculation, only some modes are listed in Table 5. In Table 5, the modal assurance criterion (MAC) of arch rib 1st order symmetrical lateral bending, girder 1st order antisymmetrical lateral bending, girder and arch rib 1st order antisymmetrical vertical bending, and arch rib 1st order torsional mode shapes are given. Except for the arch rib 1st order antisymmetrical vertical bending, the MAC of the others is over 0.95, which shows a high correlation between the model and measured data.

Mode shapeFE modelKriging modelGA

Arch rib 1st order symmetrical lateral bending0.96730.96780.9579
Girder 1st order antisymmetrical bending0.99310.99320.9932
Arch rib 1st order antisymmetrical vertical bending0.81850.81730.8193
Girder 1st order antisymmetrical vertical bending0.99310.99320.9932
Arch rib 1st order torsional0.97960.97910.9791

In order to obtain the corresponding frequency of the bridge, the MAC was applied to match the mode shapes (Table 5). Furthermore, error 2-norm of first-order natural frequency is also shown in Table 6.

Initial modelKriging model 1Kriging model 2Kriging model 3Kriging model 4Kriging modelGA


Note. Kriging model 1 takes the corresponding frequency of girder lateral mode shapes as the training samples; Kriging model 2 takes the corresponding frequency of arch rib torsional mode shapes as the training samples; Kriging model 3 takes the corresponding frequency of the girder arch rib vertical mode shapes as the training samples; Kriging model 4 takes the corresponding frequency of girder lateral mode shapes as the training samples; Secondary updated Kriging model is based on the calculation accuracy of the previous 4 Kriging models.

In Table 6, the frequency error of the updated model by using the Kriging model is the smallest, while the frequency accuracy of the noncorresponding updated model is slightly insufficient. All the errors of updated models with the Kriging model are below 10%, while the error 2-norm of the Kriging model is higher than GA. For this bridge, the calculation time of Kriging model is about 0.2 times that of GA. The FE model updated method based on the Kriging model reduces the dependency on the number of samples and improves the calculation efficiency without sacrificing the accuracy.

The updated results by using GA show that only the error of first-order natural frequency is over 10%, and the updated results have been improved a lot (its error 2-norm is smallest). Moreover, as enough population and genetic algebra are defined, GA can obtain higher accurate results, while the process takes a long time.

4. Conclusions

In this paper, a dynamic model updating procedure for bridges based on the Kriging model is presented. The Kriging model was established based on LHS, and the effectiveness of the Kriging model method was investigated in two typical bridges. Comparing the proposed method with GA, the following conclusions can be drawn:(1)After the FE model updating, the accuracy of modal frequencies and mode shapes is greatly improved. Therefore, the updated FE model can be used for a long-time structural health monitoring.(2)The updated FE model with the Kriging model just needs a certain number of measured natural frequencies, and then a high accurate updated model can be obtained. In terms of computational cost reduction, compared to GA, the proposed method can reduce the computational cost without losing accuracy, which implies further potential application in the engineering field.(3)The proposed method only applies to a truss bridge and a tied-arch bridge in the paper, and although the Kriging model has its advantages in reducing the computational expense compared to GA, the advantages of the proposed method should be further validated for the application in complex bridge structures, such as cable-stayed bridges, suspension bridges, and composite bridges.(4)The proposed method is verified on a truss bridge and a tie-arch bridge; for the other types of bridges, such as simple supported beam bridge, suspension bridge, and cable-stayed bridge, the application can be done in the same manner.

Data Availability

The datasets generated and analyzed during the current study are available from the corresponding author upon reasonable request.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.


The first author wishes to thank the support from National Natural Science Foundation of China Grants nos. 11672108, 11202080, and 51478193 and the innovation fund of South China University of Technology leading to an excellent Ph.D. dissertation. Shiping Huang is also supported by the Research Fund of The State Key Laboratory of Coal Resources and Safe Mining, CUMT, and by the Fundamental Research Funds for the Central Universities. The authors wish to thank all colleagues for helping in the survey and measurements. The support of China Railway Guangzhou Bureau Group Co., Ltd., Research Project is also gratefully appreciated.


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