摘要
试验研究宜昌长江公路大桥悬索桥的自振特性 ,采用全桥结构的组合有限单元模型理论计算桥梁自振特性 ,给出自振模态计算结果的图示 ,并比较实测结果和理论计算结果。在车辆行车速度小于 5km·h- 1 时 ,实测主梁L/ 8和跨中截面的动应变影响线和动挠度影响线。无障碍行车试验采用车辆以 1 0km·h- 1 ～ 60km·h- 1 速度通过桥跨结构 ,实测无障碍行车的跨中截面和L/ 8截面主梁顶板、底板和纵向加劲肋的动应变和动挠度。有障碍行车试验采用车辆以 1 0km·h- 1 ～ 40km·h- 1 的速度通过桥跨结构 ,采用 5cm和 7cm两种高度的障碍物 ,实测有障碍行车的跨中截面和L/ 8截面主梁顶板、底板和纵向加劲肋的动应变和动挠度。
The test research on the characteristics o f the natural vibration for Yichang Yangtze River Highway Bridge are discussed in this paper. The authors calculate the characteristics of t he natural vibration for the bridge with the theoretical m odel of combined finite element for the entire bridge structure, give figures about this calculation result, and compare the test result with calc ulation result. The authors introduce the actual measurement o f influence lines of strain and deflection at a speed of less than 5 km ·h -1 , and the actual measurement of dynamic strains and dynam ic deflections of top plate, bottom plate and horizontal stiffener in the sections of middle span and 1/8 span without obstacle at a speed from 10 km·h -1 to 60 km·h -1 , and with obstacle at a speed from 10 km·h -1 to 40 km·h -1 at a height of 5 cm and 7 cm respect ively. The structural performance of the bridge is further exp lored.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2002年第5期101-107,共7页
China Railway Science
关键词
悬索桥
动力试验
计算
公路大桥
Highway bridge
Suspension bridge
Dynami c test
