摘要
针对一座现役的三跨(65m+85m+65m)中承式悬吊桥面系拱桥进行静动载试验和数值分析,实测该桥拱肋、桥面、横梁、吊杆在静力荷载下的挠度、应变,分析校验系数,并测试冲击系数、吊杆张力,分析了自振特性.结果表明,静力荷载下,该桥某拱脚处抵御负弯矩刚度较差,而其他各构件的强度及刚度均满足规范要求;动载下吊杆张力测试值与计算值误差在15%以内,强度满足规范要求;实测该桥冲击系数较大,且自振特性分析表明主跨和边跨的竖弯自振频率与扭转自振频率较为接近,边跨可能存在车桥共振;车桥耦合振动特性较差,吊杆尤其是短吊杆的疲劳受力较为不利.
The static and dynamic load tests and numerical analysis were carried out on an existing three-span(65 m+85 m+65 m) half-through arch bridge with suspension deck system. In which, the deflection and strain of arch rib, bridge deck, cross beam and suspender under static load were measured, the check coefficient was analyzed, the impact coefficient and suspender tension were tested, and the natural vibration characteristics were analyzed. Results show that the certain arch foot stiffness against negative bending moments is poor under static load, while the strength and stiffness of other components meet the specification requirements. The error of suspender tension between the measured and calculated values under dynamic load is less than 15%, and the strength meets the requirements of specifications, but the measured impact coefficient is bigger. The natural vibration characteristic mode analysis indicates that the free vertical bending vibration frequency is close to the free torsional vibration frequency. Moreover, there may be a vehicle-bridge resonance on the side span of bridge. The vibration characteristics of vehicle-bridge coupling are poor which is harmful for the fatigue stress of booms, especially the short booms.
作者
李晓莉
孙治国
郭乃胜
邹雨鹤
孙宗光
LI Xiao-li;SUN Zhi-guo;GUO Nai-sheng;ZOU Yu-he;SUN Zong-guang(Transportation Engineering College,Dalian Maritime University,Dalian 116026,China;College of Civil Engineering,Institute of Disaster Prevention,Beijing 101601,China)
出处
《大连海事大学学报》
CAS
CSCD
北大核心
2019年第1期102-109,共8页
Journal of Dalian Maritime University
基金
国家自然科学基金资助项目(51708081
51678150)
辽宁省科学技术计划项目(201602066)
中央高校基本科研业务费专项资金资助项目(3132018104)
关键词
桥梁工程
中承式拱桥
悬吊桥面系
静动载试验
服役性能
bridge engineering
half-through arch bridge
suspension deck system
static and dynamic test
service performance
