中承式钢管混凝土人行天桥舒适度研究

发布时间：2018-06-22 17:45

本文选题：中承钢管混凝土拱桥 + 人群荷载　；参考：《长安大学》2014年硕士论文

【摘要】：现代人行天桥向着大跨、轻柔的方向发展，人行天桥的舒适度问题引起了越来越多的人关注。本文应用有限元软件SAP2000，结合鲅鱼圈跨金港路人行天桥实例，对中承式钢管混凝土人行天桥进行了静力分析、模态分析、动力响应分析、舒适度评价以及影响钢管混凝土拱桥舒适度因素的研究。中承式钢管混凝土人行天桥静力分析和模态分析表明该桥的内力、挠度、应力比、自振频率等参数均满足规范要求。天桥在脚步荷载作用下的动力响应分析，求到该天桥的加速度、速度、位移等动力响应值的时程曲线，表明天桥舒适度满足相关规范要求。借鉴烦恼率对人行天桥的舒适度研究，分析表明天桥自振频率较低，与人的脚步荷载频率2.0Hz相差较大，天桥竖向烦恼率为0.1253，即天桥上有12.53%的行人的人感到不适，小于假设标准20%，综合判断满足人行荷载作用下舒适度要求。在符合结构安全的条件下，吊杆的数量以及布置形式的变化对天桥结构舒适度影响很小；横撑形式、位置的对于桥梁的舒适度有一定影响，当横撑布置在拱肋与桥面板连接处对结构更有利，，采用X型横撑比平行横撑更有利于天桥舒适度；天桥的烦恼率随着拱肋的减小而增大，拱肋直径越小对烦恼率影响程度越大。拱肋直径及拱肋的含钢率是天桥舒适度主要影响因素，吊杆和横撑的布置影响较小。本文桥梁的吊杆设计比较保守，建议减半吊杆数量，拱肋直径取650mm，以优化结构设计。
[Abstract]:Modern footbridge is developing towards the direction of long span and soft. The comfort of footbridge has attracted more and more people's attention. In this paper, the finite element software SAP2000 is applied to the static analysis, modal analysis and dynamic response analysis of the through concrete filled steel tube footbridge. The evaluation of comfort and the factors affecting the comfort of concrete-filled steel tubular arch bridge are studied. The static analysis and modal analysis show that the internal force, deflection, stress ratio and natural vibration frequency of the bridge meet the requirements of the code. By analyzing the dynamic response of the flyover under the footstep load, the time-history curves of the dynamic response values such as acceleration and displacement of the flyover are obtained, which indicates that the comfort degree of the flyover meets the requirements of the relevant specifications. Based on the study of comfort degree of footbridge, the analysis shows that the natural vibration frequency of footbridge is lower, and the frequency of footwork load is 2.0Hz. The vertical vexation rate of flyover is 0.1253, that is, the people who have 12.53% of pedestrians on the flyover feel uncomfortable. Less than the assumed standard 20, the comprehensive judgment meets the requirement of comfort under the action of pedestrian load. Under the condition of structural safety, the number of suspenders and the change of arrangement form have little influence on the comfort degree of the bridge structure, while the type of horizontal brace and position have certain influence on the comfort degree of bridge. When the transverse brace is arranged at the joint of arch rib and bridge deck, it is more favorable for the structure to adopt X-type transverse brace than parallel transverse brace, and the vexation rate of overpass increases with the decrease of arch rib, and the smaller the arch rib diameter, the greater the influence of arch rib diameter on the vexation rate. The diameter of arch rib and the steel content of arch rib are the main factors affecting the comfort of overpass, but the arrangement of suspender and transverse brace has little effect. The design of suspension rod is conservative in this paper. It is suggested to halve the number of suspenders and take 650mm arch rib diameter to optimize the structural design.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.11

【参考文献】