连续钢箱梁桥抗倾覆分析

Anti-overturning analysis of continuous steel box girder bridge

分析了连续钢箱梁桥倾覆破坏机理,结合案例进行支座反力计算,制定优化方案。对连续钢箱梁桥原设计方案进行抗倾覆验算,得出支座反力为负值,且中墩支座支承设计不合理。优化后边墩和中墩支座反力均得到了较大幅度的提高,满足《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG 3362—2018)要求,说明优化方案可行。

This paper analyzes the overturning failure mechanism of continuous steel box girder bridge,calculates the bearing reaction force based on the case,and formulates an optimization plan.The antioverturning calculation of the original design of the continuous steel box girder bridge is carried out,and it is concluded that the bearing reaction force is negative,and the support design of the middle pier bearing is unreasonable.The reaction forces of the side pier and the middle pier support have been greatly improved after the optimization,which meets"Code for Design of Highway Reinforced Concrete and P restressed Concrete Bridge and Culvert"(JTG 3362—2018),indicating that the optimization scheme is feasible.