Analysis of the Structural Performance of Bolted Connected Precast Utility Tunnel
The bolted connected precast utility tunnel consists of a bottom slab,sidewalls,and top slab,with the sidewalls connected to the bottom slab by pre-embedded bolt reinforcement.To investigate the structural performance of this precast utility tunnel,full-scale low-cycle tests were conducted on its lower edge nodes and compared with cast-in-place(CIP)specimens.Based on the test results,finite element analysis models of the lower edge nodes of the precast utility tunnel were established using finite element analysis software ABAQUS,further exploring the mechanical performance affected by the axillary angle height and axial compression ratio of this assembly scheme.The test results indicate that the failure mode of both prefabricated and CIP specimens is bending failure of the sidewalls,specifically manifested as bending failure at the end of the sidewalls;The bearing capacity of the prefabricated specimens is 7%lower than that of the CIP specimens.Finite element analysis results show that the axillary angle significantly enhances the node's bearing capacity.Compared with the specimens without axillary angle,when the axillary angle height is 150mm,the model's positive and negative bearing capacities increase by 4.5%and 13.6%,respectively;When the axillary angle height is 250mm,the positive and negative bearing capacities of the specimens increase by 12%and 27%,respectively.The axial compression ratio has a minor effect on the node's bearing capacity.With the increase in axial compression ratio,the failure mode of the model changes from bending failure at the end of the sidewalls to bending failure at the end of the bottom slab.
precast concretebolted connectionplate assemblyutility tunnelfinite element analysis
NETL
NSTL
万方数据
维普
