摘要
为详细地评定某斜拉桥的实际承载能力及状况,本文通过对该桥进行静动载试验,测试并分析静载试验中主梁控制截面的应变、桥面板局部应变、主梁挠度、塔顶纵向偏位及塔根应变等静力参数,以及在动载试验中测试桥梁的冲击系数、自振频率和振型等动力响应参数。分析结果表明:各测点的实测数据与计算一般都较为吻合,部分测点校验系数大于1.0,动载试验中部分冲击系数大于计算值,阻尼比为0.338%~1.115%,表明结构承载能力的偏低。该研究结论对同类桥梁承载能力分析具有一定的意义。
In order to evaluate the actual bearing capacity and condition of a cable-stayed bridge in detail,the static and dynamic load tests of the bridge are carried out to test and analyze the static parameters such as the strain of the main girder control section,the local strain of the bridge deck,the deflection of the main girder,the vertical deviation of the tower top and the strain of the tower root,and the dynamic response of the bridge,such as impact coefficient,natural frequency and mode of vibration.The analysis results show that the measured data of each measuring point are generally in good agreement with the calculation.The check coefficient of some measuring points is greater than 1.0,and the impact coefficient is greater than the calculated value in the dynamic load test.The damping ratio is 0.338%-1.115%,which indicates that the bearing capacity of the structure is low.The research conclusion has certain significance for the analysis of the bearing capacity of similar bridges.
作者
李翔
端茂军
魏洋
李国芬
程勋煜
LI Xiang;DUAN Maojun;WEI Yang;LI Guofen;CHENG Xunyu(School of Civil Engineering,Nanjing Forestry University,Nanjing 210037)
出处
《森林工程》
2019年第5期91-97,共7页
Forest Engineering
基金
国家自然科学基金(51778300)
江苏省自然科学基金(BK20151520)
江苏省“333”工程(BRA2016421)
江苏省“青蓝工程”项目(QL2017)
江苏省六大人才高峰项目(JZ-017)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
斜拉桥
静载试验
动载试验
承载能力
Cable-stayed bridge
static load test
dynamic load test
bearing capacity
