空间缆索体系对自锚式悬索桥的动特性影响研究

The Chain Evolution Analysis of Seismic Energy in Long Self-anchored Suspension Bridge Transmit

为了探索理想的自锚式悬索桥缆索体系以提高桥梁在地震作用下的稳定性,以吉林某自锚式悬索桥为工程实例,设计另外两种不同缆索体系的自锚式悬索桥。运用自振特性的研究方法对其自振特性进行分析;运用时程分析方法,对其在地震作用下的稳定性进行分析。结果表明:自锚式悬索桥采用内倾式空间缆索体系时,结构的侧弯及扭转频率增大,对动力特性有利;采用外倾式空间缆索体系时,结构的侧弯及扭转频率减小,对动力特性不利;在纵向地震波作用下,外倾式与平行缆索体系的结构响应更小;在横向地震波作用下,内倾式与平行缆索体系的结构响应更小。

In ordeto explore the ideal of self-anchored suspension bridge cable system to improve the stability of the bridge undethe action of earthquake, with self-anchored suspension bridge in Jilin aan example, desig- ning the othetwo kindof self-anchored suspension bridge in differencable system. By using the method of vibra- tion characteristicof itvibration characteristicwere analyzed ; using history-time method, analysiitstability un- dethe action of earthquake. The resultshow thathe anchocable suspension bridge adoptthe introversive type space system, the structure of lateral and torsional frequency increases, the dynamicharacteristicmore better; adoptextroversion type spatial cable system, lateral bending and torsion frequencieof structure reduced, the dy- namicharacteristicimore worse; undethe The longitudinal seismiwave action, the introversive and the paral- lel type anchosuspension bridge cable systems＇ dynamiresponse more smaller; undethe The lateral seismiwave action, the extroversion type cable the parallel type anchosuspension bridge cable systems＇ dynamiresponse more smaller.