Comparative Analysis of Total Load Method and Incremental Method at the Station Construction Stage by PBA
Based on a station with 3 underground floors double columns and 3 spans of Beijing Metro Line 12,which is constructed by pile-beam-arch method(PBA),four construction completion of the structural arch,middle slabs of B1,middle slabs of B2 and base slab were analyzed by total load method and incremental method respectively.The calculation results of the members forces are compared at the same stage by 2 methods.And the maximum difference percentage of bending moment of arch,side wall and middle plate,and the axial force of middle column are-52.36％,-105.52％,57.12％and-5.91％respectively;Furthermore,a 3D analysis model is established by Midas GTS to compare the structural deformation by different calculation methods;By the analysis and discussion of 2D and 3D models,the results shows that the difference between the calculation results of total load method and incremental method cannot be ignored.For the accuracy and safety of the engineering design,the incremental method is more appropriate to analyze the construction force for PBA station.The research result can provide reference for the design and construction of similar structures.
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