基于Midas Civil的下承式拱桥拆除过程施工计算分析

Construction Calculation and Analysis of the Demolition Process of a Through Arch Bridge Based on Midas Civil

下承式系杆拱桥捍海大桥由于不能满足航道要求,需要进行拆除重建。按照倒拆法的思想原则对捍海大桥进行了拆除方案的制订。为了保证拆除过程中桥梁剩余结构的安全性,采用有限元软件Midas Civil对捍海大桥老桥进行拆除施工全过程分析,分析拆除过程中桥梁剩余构件安全性、最大支反力、钢管支撑安全性以及各工况中的稳定性。结果表明:按照倒拆法制订的拆桥方案能够合理安全地将捍海大桥老桥进行拆除,各个工况下,桥梁剩余结构均安全可靠。

Hanhai bridge,a through tied arch bridge,needs to be demolished and rebuilt due to its inability to meet the waterway requirements.According to the ideological principle of inverted demolition method,the demolition plan for Hanhai bridge is formulated.In order to ensure the safety of the remaining structure of the bridge during the demolition process,the finite element software Midas Civil is used to analyze the entire construction process of the old bridge of Hanhai bridge.The safety of the remaining components of the bridge during the demolition process,the maximum support reaction force,steel pipe support safety,and stability in various working conditions are analyzed.The results show that:the bridge demolition plan formulated according to the inverted demolition method can reasonably and safely demolish the old bridge of Hanhai bridge,and the remaining structure of the bridge is safe and reliable under all working conditions.