Field Measurement and Simulation Analysis of Mechanical Demolition of Slant-legged Rigid Frame Platform Bridge
In order to study the stress state of the mechanical demolition construction process of the slant-legged rigid frame platform bridge across the expressway,and to optimize the demolition scheme,relying on a highway reconstruction and expansion project,the measured values of the deformation and stress changes of the slant-legged rigid frame platform bridge in the mechanical demolition construction process are obtained through field measurement.A nonlinear numerical simulation model is established according to the mechanical demolition process of the bridge site,and the simulation analysis is carried out.The mid-span demolition of the main beam,the middle demolition of the slant-legged and the demolition of the main beam at the top of the slant-legged are compared and selected,and the collapse mode of the platform bridge is analyzed.The research results show that the failure process and final collapse state of the platform bridge obtained by simulation analysis are basically consistent with the actual situation.The early warning value of platform bridge collapse should refer to the vertical deflection,and 0.81 can be taken as the reduction coefficient.The demolition scheme of the main beam at the top of the slant-legged is the optimal scheme,which has the advantages of smooth collapse,no transverse bridge deviation and small construction risk.
万方数据
维普
