碰撞荷载下钢筋混凝土动力本构模型研究

发布时间：2018-08-20 10:19

【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。
[Abstract]:In order to obtain the real response of the structure under dynamic load, nonlinear finite element analysis is needed based on the reasonable dynamic constitutive model. Firstly, several kinds of concrete dynamic constitutive models used for ship impact bridge are introduced: reinforced concrete damage model, elastoplastic cap cover model TCK model, RHT model and HJC model; Then two groups of simulation analysis are carried out by using LS-DYNA software: the impact test of rigid ball and concrete target wall and the impact test of heavy hammer and reinforced concrete beam, and the simulation of each kind of dynamic constitutive model of concrete. The calculated dynamic impact force time curves and displacement-time curves are compared with the experimental data. It is found that the reinforced concrete damage model is more close to the experimental results in the simulation of crack development and concrete damage change. The effect of reinforcement ratio on impact force is considered more accurately. On this basis, the parameter sensitivity analysis of the damage constitutive relation of reinforced concrete is carried out, and the formula of impact force considering many factors is put forward. The results show that the maximum impact force increases with the increase of the reinforcement ratio and the yield strength of the steel bar, which should be considered in the ship-bridge collision analysis.
【作者单位】：长安大学旧桥检测与加固技术交通行业重点实验室;中交第一公路勘察设计研究院有限公司;
【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)
【分类号】：U441

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