一种拱梁组合体系人行桥的设计要点分析

Key Design Points of an Arch-Beam Composite System Pedestrian Bridge

摘要:

以太原市某拱梁组合体系人行桥为背景工程，提出了人行桥设计创新中应重视因地制宜的总体布置与精细化构造设计方案。该人行桥总体布置摒弃传统的全宽跨越地面道路的总体布置模式，仅在机动车道范围布设主桥，两侧通过下行梯道顺接，既实现景观过渡，又缩减占地与梯道规模，同步提升结构性能、经济性与美观度。构造设计聚焦轻钢结构人致振动难题，对比3种斜吊杆方案后采用2对柔性斜吊杆设计，通过优化固有频率从根源规避振动问题。同时系统阐述总体布置与上下部构造，实现功能与美学的多维度平衡，为同类工程提供技术参考。

Abstract:

Taking an arch-beam composite system pedestrian bridge in Taiyuan as the background project, it is proposed that in the design innovation of pedestrian bridges, the emphasis should be placed on the overall layout and refined structural design schemes that are adapted to local conditions. The traditional model of full-width spanning over ground roads is abandoned in the overall layout of the pedestrian bridge. The main bridge is only constructed within the scope of motor vehicle lanes, and its both sides are smoothly connected by downward staircases, which not only achieves a landscape transition, but also reduces the land occupation and the staircase scale, simultaneously improving the structural performance, economic efficiency and aesthetic appearance. The structural design is focused on the problems of human-induced vibration in lightweight steel structures. 2 pairs of flexible diagonal suspenders are designed after comparing 3 different diagonal suspender schemes. The vibration issue is fundamentally avoided by optimizing the natural frequency. Meanwhile, the overall layout and the superstructure and substructure are systematically expounded, and a multi-dimensional balance between function and aesthetics is achieved, providing the technical reference for similar projects.