连续钢桁架弯梁桥顶推施工力学特征分析

Analysis on mechanical characteristics of incremental launching construction of curved beam bridge with continuous steel truss

为探究钢桁架连续弯梁桥顶推主梁受力规律,本文分别建立整体及局部精细化有限元模型,对连续钢桁架弯梁桥整体及局部受力机理进行计算分析。计算结果表明:在顶推过程中,下弦杆支座附件区域存在应力集中现象,范式等效应力逼近屈服极限。本文结果可为类似工程提供参考。

In order to explore the stress law of the main beam of the incremental launching of curved beam bridge with continuous steel truss,the overall and local refined finite element softwares are established respectively to calculate and analyze the overall and local force mechanism of curved beam bridge with continuous steel truss.The results show that during the process of incremental launching,the stress phenomenon is concentrated on the attachment area of the lower chord support,and the von mises stress approaches the yield limit.This results can provide references for similar engineering construction.