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首页> 外文会议>The 10th International Conference on Enhancement and Promotion of Computational Methods in Engineering and Science (EPMESC X) >Nonlinear FE Model for RC Shear Walls Based on Multi-layer Shell Element and Microplane Constitutive Model
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Nonlinear FE Model for RC Shear Walls Based on Multi-layer Shell Element and Microplane Constitutive Model

机译：基于多层壳单元和微平面本构模型的钢筋混凝土剪力墙非线性有限元模型

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Nonlinear simulations for structures under disasters have been widely focused on in recent years. However, precise modeling for the nonlinear behavior of reinforced concrete (RC) shear walls, which are the major lateral-force-resistant structural member in high-rise buildings, still has not been successfully solved. In this paper, based on the principles of composite material mechanics, a multi-layer shell element model is proposed to simulate the coupled in-plane/out-plane bending and the coupled in-plane bending-shear nonlinear behaviors of RC shear wall. The multi-layer shell element is made up of many layers with different thickness. And different material models (concrete or rebar) are assigned to various layers so that the structural performance of the shear wall can be directly connected with the material constitutive law. And besides the traditional elasto-plastic-fracture constitutive model for concrete, which is efficient but does not give satisfying performance for concrete under complicated stress condition, a novel concrete constitutive model, referred as microplane model, which is originally proposed by Bazant et al., is developed to provide a better simulation for concrete in shear wall under complicated stress conditions and stress histories. Three walls under static push-over load and cyclic load were analyzed with the proposed shear wall model for demonstration. The simulation results show that the multi-layer shell elements can correctly simulate the coupled in-plane/out-plane bending failure for tall walls and the coupled in-plane bending-shear failure for short walls. And with microplane concrete constitutive law, the cycle behavior and the damage accumulation of shear wall can be precisely modeled, which is very important for the performance-based design of structures under disaster loads.
机译：近年来，针对灾害结构的非线性仿真已广泛受到关注。然而，钢筋混凝土剪力墙的非线性行为的精确建模仍然是成功的，而钢筋混凝土剪力墙是高层建筑中主要的抗侧向力结构构件。本文基于复合材料力学原理，提出了一个多层壳单元模型来模拟RC剪力墙的面内/面外耦合弯曲和面内弯曲-剪切耦合非线性行为。多层壳元件由具有不同厚度的许多层组成。并且将不同的材料模型（混凝土或钢筋）分配给各个层，以便可以将剪力墙的结构性能直接与材料的本构关系联系起来。 Bazant等人最初提出了一种新颖的混凝土本构模型，称为微平面模型，该模型虽然有效，但在复杂应力条件下无法提供令人满意的混凝土性能，但传统的混凝土弹塑性断裂本构模型却是有效的。的开发旨在为在复杂应力条件和应力历程下的剪力墙混凝土提供更好的模拟。利用所提出的剪力墙模型分析了静力推覆荷载和循环荷载作用下的三层墙。仿真结果表明，多层壳单元可以正确模拟高墙的平面内/平面耦合弯曲破坏和短墙的平面内剪切剪切耦合破坏。借助微平面混凝土的本构关系，可以精确地模拟剪力墙的循环特性和损伤累积，这对于在灾害荷载下基于性能的结构设计非常重要。

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