五种材料模型SCS组合剪力墙有限元分析.docVIP

 五种材料模型 SCS 组合剪力墙有限元分析 张斌，周德源** （同济大学结构工程与防灾研究所，上海 200092） 5 10 15 20 25 30 35 40 摘要：为选择合适的材料模型模拟双层钢板内填混凝土组合剪力墙核心混凝土的受力特性， 对 Von-Mises、Mohr Coulomb、Drucker Prager、Smeared Cracking 和 Damage Plastic 五 种不同的材料模型在能否引入单轴抗拉强度、单轴抗压强度、双轴抗压强度、塑性体积膨胀， 能否采用不相关流动法则及能否反映拉压子午线的不同六个方面进行了比较分析，得出 Damage Plastic 模型最能体现上述六种特性。核心混凝土分别采用以上五种材料模型，对 双层钢板内填混凝土组合剪力墙抗剪试验进行有限元分析，并与试验结果比较。结果表明， Damage Plastic 模型计算荷载位移曲线与试验结果最为相近，其次是 Smeared Cracking 模 型及 Drucker Prager 模型。Von Mises 和 Mohr Coulomb 模型与试验结果差别较大，不能反 映核心混凝土的受力特性。 关键词：双层钢板内填混凝土组合剪力墙；核心混凝土；塑性体积膨胀；有限元分析；抗剪 试验 中图分类号：TU398.2 Comparison among five material models in FEA of concrete-filled box walls ZHANG Bin, ZHOU Deyuan (Institute of Structural Engineering and Disaster Reduction,Tongji University, ShangHai 200092) Abstract: ：In order to obtain the appropriate material model which could simulate the behavior of the core concrete of concrete-filled steel box walls，five different models-Von Mises，Mohr Coulomb，Drucker Prager，Smeared Cracking and Damage Plastic，were discussed on whether they could characterize the uniaxial compressive and tensile strength，the biaxial compressive strength，the plastic volume dilatancy，the non-associated flow rule or the difference between the tensile meridian and the compressive meridian. Damage Plastic model was found to be the best. FEA was made to simulate the shear test of concrete-filled box walls，using theses five material models above. The analyzed results were compared with the test results which showed the calculated load-displacement curve of Damage Plastic model did very well with the test curve. The calculated results of Smeared Cracking and Drucker Prager models were acceptable but the calculated results of Von Mises and Mohr Coulomb models were far away from the test results. Keywords: concrete-filled box wall; core concrete; plastic volume dilatancy; FEA; shear test 0 引言 双层钢板内填混凝土组合剪力墙(简称 SCS)能够更好的发挥钢材和混凝土的材料特性： 核心混凝土具有较大的刚度，限制了钢板的局部屈曲；钢板对混凝土的约束作用使混凝土处 于多轴受力状态，提高了其受力性能[1-4]。SCS 组合剪力墙平面内具有很高