双塔单索面人行钢斜拉桥的设计与受力分析

以某双塔单索面人行钢斜拉桥为对象，采用Midas Civil建立全桥空间杆系有限元模型，进行恒载、活载和承载能力极限状态作用下结构受力性能分析，同时开展该桥的动力特性分析。研究表明:对于该异形斜拉桥，活载引起的主梁和主塔弯矩效应较恒载作用下的结果更加显著；承载能力极限状态作用下，该桥主梁、主塔、斜拉索等主要承重构件的最大应力均小于材料容许应力，满足规范要求；动力特性分析结果表明主梁面内刚度和主塔面外刚度较小，此外遮阳棚的局部振动在高阶振型中所占比例较大，在地震作用下可能发生破坏；该桥的一阶竖向自振频率为1.92 Hz，不满足现行规范要求，建议采取有效的减振措施来控制人致振动响应。

Design and mechanical analysis of a double-tower single-plane steel cable-stayed bridge for pedestrians

A double-tower single-cable plane pedestrian steel cable-stayed bridge was taken as the research object to establish a full-bridge spatial member finite element model with Midas Civil, so that mechanical performance can be conducted under the action of dead load, live load and bearing capacity limit state. Meanwhile, the dynamic characteristics analysis was carried out. Research shows that for this kind of special-shaped cable-stayed bridge, the bending moment effect of the main girder and the main tower caused by the live load was more significant than those of the dead load. The maximum stresses of the main load-bearing components, such as the main girder, the main tower, and stay cables, under the ultimate bearing capacity state were lower than the allowable stress of the material, which meets the requirements of the specification. The dynamic characteristic analysis results demonstrate that the in-plane stiffness of the main girder and the out-plane stiffness of the main tower were relatively small. In addition, the local vibration of the sunshade accounted for a large proportion in the high-order vibration mode, which would suffer damage under the action of earthquakes. The first-order vertical natural vibration frequency of the bridge was 1.92Hz, which did not meet the requirements of the current specification. It is recommended to take effective vibration reduction measures to control the human-induced vibration response.