橡胶混凝土材料耗能特性及其在梁式桥防撞减振中的应用

项目名称： 橡胶混凝土材料耗能特性及其在梁式桥防撞减振中的应用

项目编号： No.51478030

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 刘保东

作者单位： 北京交通大学

项目金额： 86万元

中文摘要： 橡胶混凝土是以混凝土为基材，掺入橡胶集料制成的复合材料，橡胶集料的加入不仅改善了混凝土的抗裂性能和延性，使得它具有较强的耗散能力，而且为科学处理废旧轮胎提供了一条新的途径。本课题拟利用理论与试验相结合的方法，从研究橡胶混凝土材料的耗能特性入手，开展其在梁式桥防撞减振中的应用研究。按照从材料到构件再到结构的层级，通过轴向滞回试验获取橡胶混凝土材料的耗能特性及动荷载参数对其耗能特性的影响规律，提出橡胶混凝土材料耗能计算方法；通过普通混凝土构件增加橡胶混凝土覆层的试验，研究覆层材料、覆层设置方式、覆层与原构件厚度比、刚度比等参数对构件自振特性、动力响应特性及抗冲击特性的影响规律，提出利用橡胶混凝土覆层防撞减振的优化设计方法；通过附加模态阻尼比的方法考虑橡胶覆层的影响，对采用橡胶混凝土覆层的梁式桥进行撞击响应和地震响应计算，分析应用橡胶混凝土覆层的防撞减振效果，给出针对实桥的合理防撞减振实施方案。

中文关键词： 橡胶混凝土；耗能；碰撞效应；试验研究；梁式桥

英文摘要： Rubberized concrete is a composite material, which is based on concrete material and mixed with crumb rubber.Crumb rubber can not only improve anti-cracking ability and ductility, which makes concrete a stronger dissipation capacity, but also provide a new way to deal with scrap tire scientifically.The subject studies the dissipation performance of rubberized concrete firstly,and then carries out its application in anticollision and vibration reduction of girder bridge by combining theoretical method and experimental method.According to the level of material,component and structure, the dissipation performance of rubberized concrete and the influence of dynamic load characteristics on dissipation performance are obtained by axial hysteretic test, and the dissipation computational method of rubberized concrete is proposed. The influence of some parameters, such as clad material,cladding setting ways,thickness ratio and stiffness ratio of cladding and the original members,etc.,on the natural vibration characteristics,dynamic response and impact properties is studied by the experiment of adding rubberized concrete cladding to the ordinary concrete members,and optimization design method for anticollision and vibration reduction of rubberized concrete is proposed.The collision response and seismic response of girder bridge with rubberized concrete cladding are calculated and the anticollision and vibration reduction effects of rubberized concrete are analysed by additional modal damping ratio,and reasonable implementation plan for anticollision and vibration reduction of real bridge are proposed.

英文关键词： rubberzied concrete;energy dissipation;collision effect;experimental investigation;girder bridge