某下承式系杆拱桥的结构受力分析

Mechanical Analysis of the Sucken Arch Bridge

以某下承式系杆拱桥为研究背景,运用Midas/Civil软件建立全桥有限元模型,分别对该桥吊杆、拱肋和系杆结构的轴力及弯矩进行数值分析,得出以下结论:1)活载引起吊杆、拱肋和系杆的轴力与弯矩值仅为恒载的1/10左右;2)恒载和活载作用下,拱肋、系杆与吊杆固结处产生附加内力随着时间推移会致使吊杆产生损伤.3)系杆拱桥的吊杆、系杆结构在恒载与活载作用下均处于受拉状态,故布置于结构内的预应力钢束能有效改善自身受力状态.

Taking a sunken arch bridge as the research background,using Midas/Civil software to establish the finite element model of the whole bridge to make the numerical analysis of arch bridge suspender,axial force and bending moment of rib and tie structure,some conclusions are drawn as follow: 1) value of axial force and bending noment of suspender,rib and tie bar,which is caused by live load is only 1/10 of that caused by dead load; 2) internal force in conjuction between rib,tie bar and suspender will cause damage to suspender over time; 3) suspender,tie bar are all in stable state under impace of dead load and live load,so steel beam in the structure can improve its own state.