基于分层壳单元剪力墙模型
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点击下载高强配筋框－剪结构的抗震分析
防灾减灾工程学报,
27(sup.), 2007, 133-137.
摘 要 在框－剪结构的剪力墙中配置高强钢筋可以显著提高其安全储备，使得剪力墙在框架之后屈服，并改变地震剪力的分配规律。本文利用MSC.Marc
2005以及清华大学在MSC.Marc基础上开发的混凝土纤维模型程序THUFIBER和适用于剪力墙结构非线性分析的分层壳墙单元模型，对高强配筋及普通配筋的两个8层钢筋混凝土框－剪结构进行了静力推覆分析和实际地震波作用下的动力时程分析，重点研究了高强钢筋对框－剪结构抗震性能控制的效果。研究结果表明，剪力墙中采用高强钢筋配筋后，改变了剪力墙和框架的刚度退化规律，提高了剪力墙的屈服强度，且同时具有较好的极限变形能力，可以有效提高整个结构的安全储备，对结构抗震是有利的。
关键词 框－剪结构 高强钢筋 静力推覆 动力 非线性
Nonlinear
FE model for RC shear walls based on multi-layer shell element and microplane
constitutive model
Proc.
Computational Methods in Engineering And Science (EPMESC X), Tsinghua
University Press & Springer-Verlag, Aug. 2006, Sanya, Hainan,China,
2006, CDROM.
Abstract: 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.
Keywords: shear wall, nonlinear analysis,
microplane, finite element, multi-layer shell element
静力和动力荷载作用下钢筋混凝土框－剪结构剪力分配的研究
第一届全国城市与工程安全减灾研究与进展研讨会论文集, 唐山, 2006, 306-312.
摘 要: 框架－剪力墙结构在非弹性变形阶段的内力分布，关系到框架以至整个结构体系的安全，应该在抗震设计中加以考虑。本文利用MSC.Marc
2005以及清华大学在MSC.Marc基础上开发的混凝土纤维模型程序THUFIBER和适用于剪力墙结构非线性分析的分层壳单元，对一个钢筋混凝土框－剪结构进行了静力弹塑性计算和动力时程计算，分析了在结构不同变形阶段水平剪力在框架和剪力墙之间的分配规律。
关键词 框－剪结构 静力 动力 非线性 剪力分配
分层壳模型在剪力墙结构计算中的应用
防护工程, 28(3), 2006, 9-13.
摘要 钢筋混凝土剪力墙是高层建筑中的主要抗侧力构件，要正确模拟高层建筑的破坏行为，就必须提出能够准确模拟剪力墙构件破坏的力学模型。本文基于复合材料力学原理，提出了适用于剪力墙结构倒塌破坏非线性分析的分层壳墙单元模型，并与纤维模型结合，对带暗柱剪力墙的面内剪切、面内弯曲和面外弯曲行为进行了模拟计算。与相应的试验及理论结果比较的结果表明，本文模型计算结果在受力变形规律、承载力及刚度等方面均与试验和理论吻合较好，验证了该计算模型的可靠性，可以将其应用于防护工程、抗震工程中实际剪力墙结构的非线性计算分析。
关键词： 剪力墙；分层壳模型；纤维模型；非线性分析；倒塌