中、下承式拱桥断索动力响应分析  

Dynamic Response Analysis of Half- through and Through Arch Bridges based on Cables Fracture

作　　者：余印根 

机构地区：[1]福建省永正工程质量检测有限公司,福建福州350012

出　　处：《福建建设科技》2015年第5期18-21,共4页Fujian Construction Science & Technology

摘　　要：以一座中承式和一座下承式钢管混凝土拱桥为工程背景,利用ANSYS瞬态分析功能和单元生死技术分析对断索作用下悬吊桥面系的动力响应进行了研究,并对吊杆破断剩余结构敏感性和易损性进行分析。分析结果表明,加劲纵梁对吊杆破断敏感性指标最高,易损性指标最大,且吊杆破断后加劲纵梁达到最大响应的历时时间最短,属于断索作用下最可能先产生破坏的构件;当吊杆发生锈蚀疲劳等损伤后,剩余吊杆可能先于加劲纵梁发生破坏,而导致连续断索的发生。Based on the engineering of a half through bridge and a through arch bridge, the dynamic response of the bridge deck structures after cables fracture was studied by using ANSYS transient analysis function and cell death technology.And the sensitivity and vulnerability of the residual structure was analyzed.The results show, compared to arch and the remaining cables, stiffening girder is the most possible damage component after cable fracture for its highest sensitivity, biggest vulnerability and shortest time to achieve maximum response. When corrosion fatigue damage occurred, the remaining cables destroy may occur first, and then continuous bridge collapse occurred.

关 键 词：中、下承式拱桥 吊杆破断 剩余结构 易损性 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U448.22[交通运输工程—道路与铁道工程]