考虑吊杆断裂的拱梁组合桥动力响应分析  

Dynamic response analysis of arch⁃girder combined bridge considering the dynamic effect of suspenders fracture

作　　者：吴庆雄[1] 郑樵风 尹永胜 黄昌浩 朱建瑞 WU Qingxiong;ZHENG Qiaofeng;YIN Yongsheng;HUANG Changhao;ZHU Jianrui(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Shandong Expressway Gaoshang Highway Co.,Ltd.,Jinan,Shandong 251600,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]山东高速高商公路有限公司,山东济南251600

出　　处：《福州大学学报（自然科学版）》2023年第6期835-842,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(52078137)。

摘　　要：针对拱梁组合桥吊杆断裂动力响应问题,建立一种考虑吊杆断裂作用的拱梁组合桥等效静力计算方法.通过构建具有代表性的标准拱梁组合桥,采用有限元软件ANSYS/LS-DYNA进行吊杆断裂冲击作用下拱梁组合桥动力分析.分析结果显示,拱梁组合桥的长、短吊杆断裂,对剩余吊杆与系梁的影响较大,对拱肋的影响较小;短吊杆对剩余吊杆应力的影响程度更大,长吊杆对系梁的动力响应影响更大.采用考虑吊杆断裂作用的等效静力法计算拱梁组合桥动力响应时,短吊杆断裂时动力系数可偏安全地取为0.8,长吊杆断裂时动力系数根据跨径按公式取值.To address the problem of less research on the dynamic response of suspenders fracture in arch⁃girder combined bridges,an equivalent static calculation method of arch⁃girder combined bridges considering the effect of suspenders fracture was established.Representative standard arch⁃girder combined bridges were constructed,and the finite element software ANSYS/LS-DYNA was used to carry out the dynamic analysis of the arch⁃girder combined bridges under the impact of suspenders fracture.The results show that,the suspender fracture has a great influence on the tie⁃beam and the remaining suspenders of the arch girder composite bridge,but has a small influence on the arch rib.And the influence of short suspender for the remaining suspender stress was greater than the long suspender.The long suspender has a greater effect on the dynamic response of the tie beam than the short one.When the dynamic response of arch⁃girder combined bridge is calculated by the equivalent static method,the fracture dynamic coefficient of short suspenders can be safely taken as 0.8,the fracture dynamic coefficient of long suspenders can be calculated according to the equation.

关 键 词：拱梁组合桥 吊杆断裂 等效静力法 动力响应 

分 类 号：TU392.3[建筑科学—结构工程]