【摘要】 根据平顶山市城东河路湛河桥主桥—斜靠式拱桥的结构特点,采用M IDAS/C ivil有限元软件,建立了该桥的空间有限元计算模型,进行了不同吊杆损伤情况下的桥梁动力特性计算,通过对比桥梁在完好状态和不同吊杆损伤情况下的桥梁动力特性,得出结论:吊杆损伤对斜靠式拱桥的低阶自振频率总体影响较小,但对桥梁整体竖向自振频率和扭转自振频率相对影响较大,吊杆损伤导致桥梁竖向和扭转自振频率降低;主拱吊杆损伤比稳定拱吊杆损伤对该桥的自振频率影响大,跨中吊杆损伤比1/4跨处吊杆损伤对该桥自振频率影响大。计算结果对正确认识斜靠式拱桥在不同状态下的结构动力特征,合理评价桥梁运营阶段的健康状况提供了参考和基础性数据。更多还原

【Abstract】 According to the structural characteristics of the main bridge of Zhanhe bridge-a double X-arch bridge across the Chengdong River in Pingdingshan City,the bridge’s spatial finite element model is built by the software MIDAS/Civil.The bridge’s dynamic properties under different damaged suspenders have been calculated.By comparing the bridge’s dynamic properties in health state and with that in damaged suspender state,it can be concluded: The damaged suspenders have little influence on the bridge’s low order natural frequencies totally,but have large influence on the bridge’s vertical and torsional frequencies.So the suspender damage causes the X-arch bridge’s vertical and torsional frequencies reduced.The main arch suspender damage has more influence on bridge’s natural frequencies than the stable arch suspender damage,and the mid-span suspender damage has more influence than the one-quarter span suspender damage.These results provide a reference and basic data for understanding correctly the structural dynamic properties of double X-arch bridge in different suspender damage states and for reasonably evaluating its health status in operational phase.更多还原