论文部分内容阅读
本文通过国内外规范对人行天桥基频的规定要求,进行了大跨度环形人行天桥基频影响因素分析与研究;对我国规范要求基频的合理性进行了分析,认为设计者会采取增加材料刚度或增加梁高等措施达到满足频率要求,这样可能造成成本的增加和材料的浪费。运用有限元方法对天桥支座刚度进行模拟分析与研究,对三种计算基频的方法和成果进行比较,认为设计中考虑支座刚度和基桩情况下的基频,比在一般支撑条件下和经验公式所得的基频更接近于实际工况要求。
This paper analyzes and studies the influence factors of the fundamental frequency of the long-span circular pedestrian bridge by the requirements of the norms of both home and abroad on the basic frequency of the pedestrian bridge; analyzes the rationality of the fundamental frequency required by our country’s regulation, and considers that the designers will adopt the method of increasing material stiffness Or increase the beam higher measures to meet the frequency requirements, which may result in increased costs and material waste. The finite element method is used to simulate and study the stiffness of flyover support. The comparison between the three methods and results of calculating fundamental frequency is given. It is considered that the stiffness of foundation and the fundamental frequency of foundation piles are considered in the design. And the empirical formula of the fundamental frequency closer to the actual conditions required.