Multi-layer Shell Element for Shear Wall

Home My Research

 

Paper download

Paper title
Journal/Proceeding
Download
A shear wall element for nonlinear seismic analysis of super-tall buildings using OpenSees Finite Elements in Analysis & Design, 2015  
Finite element analysis and engineering application of RC core-tube structures based on the multi-layer shell elements China Civil Engineering journal, 2009 Download
Elasto-plastic Analysis for A Steel Frame-Core Wall Structure Sichuan Building Science, 2008 Download
Seismic nonlinear analytical models, methods and examples for concrete structures Engineering Mechanics, 2006 Download
Seismic performance of frame-shear wall structures with high-strength reinforcement Journal of Disaster Prevention and Mitigation Engineering, 2007 Download
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),2006 Download
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, 2006 Download
Application of Layered Model in Analysis of Shear Wall Structures Protective Engineering, 2006 Download

Finite element analysis and engineering application of RC core-tube structures based on the multi-layer shell elements
China Civil Engineering journal, 2009, 42(3): 51-56.

Abstract£ºAs one of the most widely used lateral resistant structures, reinforced concrete (RC) core tube consists of diverse members and appears spatial mechanical behaviors. Therefore, how to accurately simulate the RC tubes for the whole process of nonlinear behaviors is an important problem in seismic analysis of structures. Based on the multi-layer shell element, the whole process simulation of a pseudo-static testing on RC core tubes is presented in the paper. By correct modeling of the key parts (such as walls, coupling beams, reinforcement), the numerical model is able to simulate the spatial behavior of the tube as well as the complicated nonlinear behaviors such as the yielding and shear failure of coupling beams, cracking of the tube and so on. Results from the simulation match well with those from the tests. Using the proposed core-tube model, an elastoplastic analysis for a practical framed core-tube structure is conducted, to illustrate the implementation of proposed model in real structures. The tube model based on multi-layer shell is helpful in the elasto-plastic analysis of high-rise building under severe earthquakes.
Keywords£ºCore tube, Finite element, Multi-layer shell, Elastoplastic calculation, Seismic Analysis

Download PDF version Here

Elasto-plastic Analysis for A Steel Frame-Core Wall Structure
Sichuan Building Science, 2008, 34(3): 5-10.

Abstract: Structures will enter nonlinear stage during strong earthquakes. Hence accurate prediction for the structural nonlinear behaviors is important to the safety and loss assessment during earthquakes. This paper reviews the existed nonlinear analytic models for structures and presents some novel models for structural nonlinear analysis that recently developed by the Tsinghua University. With these models, the material stress-strain relationship can be connected directly with the force-displacement behavior of the structural elements. So that the complicated coupled axial force-bending moment-shear force behaviors can be properly simulated, as well as the corresponding cycle behaviors. With the secondary development user subroutines, convenient pre and post process functions and extinct nonlinear capacity of general purpose FE software of MSC.MARC, the spatial seismic responds of structures can be precisely simulated. A steel frame-core wall structure with an eccentric tube is analyzed with static pushover and dynamic time-history analysis to demonstrate the applications of the new models.
Keywords: nonlinear analysis, structure, seismic, fiber model, shear wall, multi-layer shell

Download PDF version Here

Seismic nonlinear analytical models, methods and examples for concrete structures
Engineering Mechanics, 2006, 23(sup. II). 131-140.

Abstract: Structures will enter nonlinear stage in strong earthquake, precisely prediction for the nonlinear behavior of reinforced concrete (RC) structures in earthquake is important to assess the aseismic safety of the structures. This paper presents the programs recently developed by the Civil Engineering Department of Tsinghua University, which include the fiber model based the program THUFIBER for RC frames, the program NAT-PPC for prestressed concrete (PC) frames, and multi-layer shell element based shear wall program. These programs can connect the nonlinear nodal force/nodal displacement relationship of elements directly with the nonlinear stress/strain relationship of materials. So complicated cycle behaviors and coupled axial force-biaixal bending-shear behaviors of the RC structures can be correctly simulated. And furthermore, with the convenient pre/post process and nonlinear capacity of common finite element software, these programs not only can precisely simulate the spatial structural nonlinear seismic response, but also can simulate some extreme nonlinear problems such as blast or collapse. The precision and the capacity of the programs are illustrated in this paper with a series of researches and applications.
Keywords: reinforced concrete, seismic, nonlinear, fiber model, shear wall, multi-layer shell

Download PDF version Here

Seismic 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

Download PDF version Here

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

Download PDF version Here

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

.Download PDF version Here

Application of Layered Model in Analysis of Shear Wall Structures
Protective Engineering, 28(3), 2006, 9-13

Download Here

 

Introduction
Research
Application
Teaching
Publications
Download
Issues
Others

Our Lab

Collapse Prevention Committee