Mechanical Behavior and Calculation Method for RC Fifteen-Pile Cap of Mixed Passenger and Freight Railway Bridge
Table 4
Comparison of ultimate load of caps between FEM and the present method.
Calculation model
Ultimate load
(2)/(1)a
(1) The result of FEM (106 N)
(2) The result of present method (106 N)
Concrete strength grade
C25
249.5
238.8
0.957
C30
306.4
280.9
0.917
C35
340.0
330.1
0.971
C40
374.5
379.2
1.013
C45
417.7
421.4
1.009
Pile spacing (m)
4.2
296.1
303.1
1.024
5.4
284.3
257.0
0.904
6.0
260.8
234.7
0.900
6.6
222.2
215.2
0.968
Cap thickness (m)
2.0
246.4
223.6
0.907
2.5
272.8
257.2
0.943
3.5
312.2
298.7
0.957
4.0
333.4
311.4
0.934
The average value of the ratio is 0.954 with a variance of 0.042
Note. The calculation model of cap thickness = 3.0 m and pile spacing = 4.8 m is the same as that of concrete strength grade C30; therefore, not all of them are listed in Table 4. aRatio of the result of present method (2) and FEM (1).
