某索承桁架人行景观桥的抗震可行性分析

Analysis on Seismic Feasibility of a Cable Supported Truss Ppedestrian Landscape Bridge

为促进现代交通科学和技术的绿色及可持续发展,山谷景观桥梁设计需以达成环境友好创新为目的。某人行景观桥主桥采用索承桁架结构,桥体两端与山体内隧道连接。为减小山谷风雨激振的影响,通过双斜钢索斜拉桥身桁架并预安装钢索减振器,创新的平衡方式合理处理了各支撑处的受力传递及转移,简化了支撑结构。在说明设计概念的形成过程,介绍了桥梁的基本信息后,对桥梁进行了合理的静力分析并进行预拱度优化,同时从反应谱分析和时程分析两方面验算了拟建桥梁的抗震可行性,希望为今后类似桥梁设计建设有所帮助。

In order to promote the green and sustainable development of modern transportation science and technology,the design of valley landscape bridge needs to achieve the goal of environment-friendly innovation.The main bridge of a pedestrian landscape bridge is a cable supported truss structure,and the both ends of the bridge are connected with a tunnel in the mountain.In order to reduce the impact of wind and rain induced vibration in the valley,through the truss of double inclined steel cable-stayed bridge and the pre-installation of steel cable damper,the innovative balance method is used to reasonably deal with the force transmission and transfer at each support,and simplify the support structure.After explaining the formation process of the design concept and introducing the basic information of the bridge,the reasonable static analysis of the bridge and the optimization of the camber are carried out.At the same time,the seismic feasibility of the proposed bridge is checked and calculated from two aspects of response spectrum analysis and time history analysis,which is hoped to be helpful for the design and construction of similar bridges in the future.