中承式提篮拱桥吊杆断裂易损性分析  

FRAGILITY ANALYSIS OF BOOM FRACTURE IN HALF-THROUGH BOWSTRING ARCH BRIDGE

作　　者：何沛祥[1] 蔡翔 刘信[1] HE Peixiang;CAI Xiang;LIU Xin(School of Civil Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院

出　　处：《钢结构（中英文）》2019年第10期58-61,77,共5页Steel Construction（Chinese & English）

摘　　要：吊杆断裂是中承式提篮拱桥典型的损伤形式。为了研究其在吊杆断裂情况下的易损性问题,以一座中承式提篮拱桥为对象,通过建立有限元模型,得出吊杆断裂情况下的动态响应,进而计算出静力放大系数,再采用静力放大系数法考虑吊杆断裂的冲击作用,以此对其易损性进行评估。结果表明:不同位置的单吊杆断裂时,其相邻吊杆易损性指数变化较大,其中在长吊杆位置处的易损性指数较大,已超过设计弯曲应力容许值,对结构安全不利。Boom fracture is a typical damage form of half-through bowstring arch bridge.To explore the fragility of the boom in case of a boom fracture,taking a half-through bowstring arch bridge as the research object,the paper obtained the dynamic response of a half-through bowstring arch bridge with a boom fracture by establishing a finite element model.Then the static amplification factor was calculated and the impact of the boom fracture was taken into consideration according to the static magnification factor method.On this basis,the fragility was evaluated.The results indicated that under the circumstances of a single boom fracture,the fragility index of adjacent boom varied greatly with the position of the boom,and the fragility index of the longer boom was significantly larger,exceeding the allowable bending stress,which was detrimental to the structural safety.

关 键 词：易损性 静力放大系数法 吊杆断裂 提篮拱桥 

分 类 号：TF[冶金工程]