碰撞荷载下钢筋混凝土动力本构模型研究  

Research on Dynamic Constitutive Model for Reinforced Concrete Under Impact Loading

作　　者：周敉[1] 温杰[1] 王超[2] 贺拴海[1] 

机构地区：[1]长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安710064 [2]中交第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《中国公路学报》2017年第4期59-71,共13页China Journal of Highway and Transport

基　　金：交通运输部应用基础研究项目(2015319812010);陕西省社会发展科技攻关项目(2015SF265);国家山区公路工程技术研究中心开放基金项目(gsgzj-2012-07);中央高校基本科研业务费专项资金项目(310821151107;310821163305);陕西省交通科技项目(15-19K)

摘　　要：为了得到结构在动荷载下的真实响应,需要以合理的动力本构模型为依据,进行非线性有限元分析。首先介绍了用于船舶撞击桥梁的几种使用较多的混凝土动力本构模型:钢筋混凝土损伤模型、弹塑性帽盖模型、TCK模型、RHT模型、HJC模型;然后采用LS-DYNA软件进行了2组仿真分析:刚性小球与混凝土靶墙碰撞试验和重锤与钢筋混凝土梁碰撞试验;针对上述各种混凝土动力本构模型分别进行试验仿真,并将计算得出的动态撞击力-时间曲线和位移-时间曲线与试验数据进行了对比分析,发现钢筋混凝土损伤模型对结构裂缝发展和混凝土损伤变化的仿真更接近试验结果,更准确地考虑了构件配筋率对撞击力的影响。在此基础上,对钢筋混凝土损伤本构关系进行了参数敏感性分析,并提出了考虑多种影响因素的撞击力公式。研究结果表明:最大撞击力随着配筋率和钢筋屈服强度的增加而增大,在船-桥碰撞分析中应考虑其影响。In order to get the real response of structure under dynamic load, a nonlinear finite element analysis based on reasonable dynamic constitutive model was conducted. In this paper, several concrete dynamic constitutive models commonly used for ship collision with bridges were introduced including reinforced concrete damage model, elastic-plastic cap model, TCK model, RHT model and HJC model. Then the simulation analysis of two impact tests, namely, impact test of rigid beads and target concrete walls and impact test of hammer and RC beams was carried out by LS-DYNA software. The concrete dynamic constitutive models were respectively simulated and the dynamic impact force-time history curve and displacement-time history curve were compared with the experimental data. It is found that the reinforced concrete damage model was used to simulate the change of concrete damage and the development of structural cracks, the results of which was close to experimental data and the influence of reinforcement ratio on the impact force was accurately taken into account. Furthermore, a parameter sensitivity analysis was made on the reinforced concrete damage constitutive relation and the practical formula of the impact force was put forward. The result shows that the maximum impact force increases with the increase of the reinforcement ratio and the steel yield strength and the impact should be considered in the ship bridge collision analysis.

关 键 词：桥梁工程 钢筋混凝土桥梁 仿真分析 动力本构模型 配筋率 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]