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依据现行《公路桥梁通用规范》(2004年版)对车辆荷载冲击系数的计算公式,考虑桩土结构相互作用的影响,在4种结构体系动力基频计算基础上,将不同层的基频模态形式分为7种工况,分别计算出对应工况的汽车荷载冲击系数,并与相同体系单层桥的基频及冲击系数作比较,评价不同结构刚度优劣,总结了桩土结构相互作用及不同结构体系的多层桥梁的冲击系数的基本规律;论文对多层立交桥梁动力特性及活载动力冲击系数的研究成果可供此类桥梁设计参考,也可为同类桥梁的进一步研究提供经验技术支持和理论依据。
Based on the calculation formula of vehicle load impact coefficient in the current “General Rules and Regulations for Highway and Bridge” (2004 Edition) and considering the influence of pile-soil structure interaction, based on the calculation of dynamic fundamental frequencies of four kinds of structural systems, the fundamental frequency modal The forms are divided into seven kinds of working conditions, and the impact coefficients of vehicle load corresponding to the working conditions are respectively calculated. Compared with the fundamental frequency and impact coefficient of single-layer bridge in the same system, the structural stiffness of different structures is evaluated, and the interaction between pile-soil structure is summarized And the basic rules of the impact coefficient of the multi-story bridges with different structural systems; the research results of the dynamic characteristics and live load impact coefficients of the multi-story interchange can provide reference for the design of such bridges and also provide the experience for further research on similar bridges Technical support and theoretical basis.