【作者】 胡昌明； 韩林海； 侯川川；

【Author】 HU Chang-ming;HAN Lin-hai;HOU Chuan-chuan;Department of Civil Engineering, Tsinghua University;

【机构】 清华大学土木工程系；

【摘要】 建立了空心钢管混凝土叠合构件横向落锤冲击的有限元模型。模型中考虑了钢材和混凝土的应变率效应,混凝土单元在侵蚀作用下的失效,钢与混凝土的接触关系,以及轴力和冲击过程的耦合作用。使用试验数据对模型精度进行了验证。之后分析了材料和荷载参数对构件冲击下动力响应的影响规律。在选取参数范围内,冲击速度、落锤质量和管外混凝土强度对冲击力和跨中挠度峰值影响显著。所建立的有限元模型可进一步用于分析构件受力全过程、破坏模态、组成钢管混凝土叠合构件的不同部件之间的相互作用和提出实用计算方法等工作。更多还原

【Abstract】 A finite element analysis(FEA) model for concrete-encased concrete filled steel tubular(CFST) box members under lateral impact was established. The strain rate effects of steel and concrete, the failure of concrete under erosion effect, the contacts between the steel and concrete parts, and the coupling effects of axial load and impact procedure were considered in the FEA model. The FEA model was subsequently verified with experimental data. The influence of material and load parameters on the dynamic response of specimen under impact load was then analyzed with the FEA model. It was found that within the chosen parameter scopes, the impact velocity, the mass of hammer and the strength of outer concrete have the most significant influence on the peak value of the impact force and the mid-span deformation. The FEA model will further be used to analyse the full-range force state, failure mode and interaction effect among different parts of the composite section and to propose simplified calculation method for the box members in the next stage of the study.更多还原