Multi-layer Shell Element for Shear Wall
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performance of frame-shear wall structures with high-strength reinforcement
Journal of Disaster Prevention and Mitigation Engineering,
27(sup.), 2007, 133-137.
Abstract: High strength steel reinforcement in the shear walls of frame-shear wall structures can efficiently increase the safety margin and change the seismic force distribution because the shear wall will yield after the frame. With the fiber model program THUFIBER and the multi-layer-shell program, which are developed by Tsinghua University and are based on the general purpose finite element software of MSC.MARC, two 8-story reinforced concrete frame-shear wall structures, whose shear wall are reinforced with normal and high strength steel respectively, are studied with static pushover and dynamic analysis. The effect of high strength steel in the shear wall to the control of seismic performance of the structures is emphasized. The results show that with high strength steel in the shear wall, the softening behaviors of frame and shear wall are changed. The yield strength of the shear wall is increased while it still has the same the deformation capacity. And the safety margin of the whole structure is efficiently increased which benefits the seismic capacity of the structure.
Keywords: frame-shear wall; high-strength reinforcement; pushover; dynamic; nonlinear
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
Shear
force distribution in RC frame-shearwall structures under static and
dynamic loads
Proc. 1st National Symposium on the Research Progress
for the Safety of Cities and Engineering, Tangshan, 2006, 306-312
Abstract: The distribution of internal force in frame-wall structure during the nolinear phases concerns the safety of structure. A fiber model and a multi-layer-shell model for reinforced concrete(RC) structures based on the general-purpose finite element package of MSC.Marc is used to simulate the frame structure and the shear-wall structure respectively. In the pushover and dynamic time-history analysis of a frame-wall structure, the distribution of shear force between the frame and shear wall during different phases is studied.
Key words: frame-wall structure; pushover; dynamic; nolinear; distribution of shear force
Application
of Layered Model in Analysis of Shear Wall Structures
Protective Engineering, 28(3), 2006, 9-13