Effect of Construction Method on Shear Lag in Prestressed Concrete Box Girders

Table 1

Comparison of shear lag coefficients of the continuous beams under self-weight.

State	Construction type	Figure	Step	Shear lag coefficient 𝜆𝑤 on cross-sections
				𝐿/4	𝐿/2	3𝐿/4	𝐿
Before being continuous	PSSM	Figure 4	S1	1.0245	1.0183	1.0245
	CM (simplified model)	Figure 8	S1	0.8528	0.9749	0.9902	1.1409
	CM	Figure 7	S9	0.8951	0.9822	0.9930	1.1413
After being continuous	SM	Figure 1	S1	1.0362	1.0362		1.3218
	PSSM	Figure 4	S2	1.0243	1.0183	1.0245	2.3815
	CM (simplified model)	Figure 8	S2	0.8333	0.9747	0.9902	1.1419
	CM	Figure 7	S10	0.8812	0.9820	0.9931	1.1420
3 years late after being continuous	SM	Figure 1	S1	1.0362	1.0362		1.3218
	PSSM	Figure 4	S3	1.0299	1.0255	1.0573	1.1019
	CM (simplified model)	Figure 8	S3	1.0749	−0.0143	0.9770	1.1927
	CM	Figure 7	S11	1.0556	0.6493	0.9842	1.1906