Study on New Aseismic Structures

Home My Research

 

Paper download

Paper title
Journal/Proceeding
Download
Seismic behavior and modeling of steel reinforced concrete (SRC) walls Earthquake Engineering & Structural Dynamics  
Elasto plastic mechanical behavior of detailed finite element model and simplified model of mega-columns, Journal of Shenyang Jianzhu University (Natural Science), 2011 Download
Analysis to influence by bonding styles of prestressed strands/steels on re-centering behavior of prestressed concrete frames Building Structure, 2008 Download
Introduction of Robustness for Seismic Structures Building Structures, 2008 Download
Distributed TLDs in RC floors and their vibration reduction efficiency Earthquake Engineering and Engineering Vibration, 2008 Download
Studies on distributed TLD in RC floor and its vibration reduction effect Proc. 7th National Conference on Earthquake Engineering, 2006 Download
High strength/performance structural materials and the developments of modern engineering structures and the design theory Proc. 1st International Forum on Advances in Structural Engineering, 2006 Download

Elasto plastic mechanical behavior of detailed finite element model and simplified model of mega-columns,
Journal of Shenyang Jianzhu University (Natural Science), 2011, 27(3): 409-417.

Abstract: Mega-columns with a solid section area of nearly 20m2 are used in super high-rise buildings. However, their fundamental mechanical behaviors are very difficult to be studied with current experiment equipments and technology. In order to solve this problem, this paper discusses the elasto-plastic behavior of the mega-columns and establishes the corresponding simplified models. Firstly, detailed finite element models of the mega-columns are built up with solid elements based on the general-purpose finite element program-MSC.MARC. Typical load cases are applied on the detailed FE model. And then the influences of two widely used yield criteria (von Mises criterion and Drucker-Prager criterion) of concrete are discussed. The comparisons indicate that the mechanical characters of the mega-columns are not sensitive to the yield criteria, and the confinement will have some influence on the deformation capacity. However such differences can be ignored in practical use. The methodology to build up the simplified models of the mega-columns is presented and the results of the simplified model agree well with the results of the detailed FE model. The workload of the simplified model is much smaller than the detailed FE model. So it can be used in global structural elasto-plastic analysis and collapse simulation.
Key words: Finite element method; Mega-column; Elasto-plasticity; Earthquake; Collapse

Download PDF version Here

Analysis to influence by bonding styles of prestressed strands/steels on re-centering behavior of prestressed concrete frames
Building Structure, 2008, 38(8): 57-60

Abstract£ºResidual deformation is a key index to assess whether a structure can be reused or restored after an earthquake. In this paper, a PC frame has been simulated with various bonding styles of PS by a fiber model program developed and validated with test data in this study, and some simple discussions on the effect on re-centering behavior of the bonding styles of PS have been given. The results of simulation indicate that, as to PC frames designed according to codes in existence, the bonding style of PS used for columns has great influence on the re-centering behavior of PC frame, while the PS of beams have relatively little effect. According to the numerical results and considering the entire performance of PC frames, it should take priority to use the partially debonding style of PS in the engineering practice.
Keywords£ºprestressed concrete;frame structure;fiber model; bonding style; re-centering behavior; partially debonded

Download PDF version Here

Introduction of Robustness for Seismic Structures
Building Structures, 2008, 38(6): 11-15
.

Abstract:The concept of robustness of structures is firstly introduced in this paper. And importance with enough robustness for seismic structures in preventing collapse of the structures under strong intensity earthquake attack is discussed. Then the approaches to increase the robustness of seismic structures, including structural systems, strength and ductility of structure, failure modes and redundancy, are suggested.
Keywords: seismic structure; robustness; structural systems; integrity; failure mode; strength; ductility; redundancy elements.

Download PDF version Here

Distributed TLDs in RC floors and their vibration reduction efficiency
Earthquake Engineering and Engineering Vibration, 2008, 7(1): 107-112.

ABSTRACT: A novel distributed tuned liquid damper (DTLD) to reduce the vibration of structures is pro-posed in this paper. Its basic working principle is filling of the empty space inside the pipes or boxes of the cast-in-situ hollow reinforced concrete (RC) floor slabs with water or other damping liquid. Hence these pipes or boxes will work as a series of small TLDs inside the structure. Thus, no additional spaces are needed for TLDs whilst the damping ratio of the whole structure is obviously increased. Numerical simulation with the fluid-structure coupled effect is carried out to evaluate its vibration-reduction effect. The results indicate that distributed TLD can considerably increase the damping of the building and thus reduce the vibration. Some parameters influencing the vibration-reduction are also studied.

Keywords: distributed tuned liquid damper (DTLD), fluid-structure interaction (FSI), vibration reduction, hol-low floor slab

Download PDF Version Here

Studies on distributed TLD in RC floor and its vibration reduction effect
Proc. 7th National Conference on Earthquake Engineering, Guangzhou, 2006, 812-817.

Abstract: Currently cast-in-situ hollow reinforced concrete (RC) floor has been used widely in construction. If the empty space inside the pipes and the boxes embedded in the hollow floor is filled with some cheap liquid (such as water) to build up distributed TLD (tuned liquid dampers), then the total damping of the structure will be increased which results in a reduction of vibration. And this distributed TLD has some more advantages beside vibration control such as low cost and never occupying usable space. So it is believed that distributed TLD inside hollow floor will has a bright future. This paper demonstrates the feasibility of distributed TLD with the fluid-structure coupled simulation ability of common finite element package ANSYS. Parametric discussions are presented to show the factors that may govern the effect of vibration reduction. And the numerical results proved that distributed TLD has obvious effects to reduce the seismic vibration.

Keywords: distributed TLD, fluid-solid coupled simulation, vibration reduction, hollow floor

Download PDF version Here

High strength/performance structural materials and the developments of modern engineering structures and the design theory
Proc. 1st International Forum on Advances in Structural Engineering, Beijing: China Building Industry Press, Beijing, 2006, 208-250.

Abstract: This paper firstly presents the latest development of high strength/performance structural materials in recent years. The rational applications and examples of high strength/ performance structural materials in the structural systems to obtain high performance are discussed and presented. The positive functions of high strength reinforcement used in reinforced concrete frame structures, that can enhance the structural performance against earthquake and reduce the structural seismic damage, are investigated in detail with nonlinear pushover analysis and dynamic analysis. The results show that the high seismic performance of the reinforced concrete frames, including a delayed appearance of plastic hinges at the bottom story columns feet, to form a rational failure mechanism under strong earthquake, and a small residual displacement after earthquake that cause an easy retrofitting after earthquake, can be obtained by replacing normal strength reinforcement with high strength reinforcement in the columns. Finally, the development of the safety and design theory for the structures using high strength/performance materials are discussed.

Keywords: High strength/performance concrete; High strength/performance steel; Engineering Structures; Structure safety; Design theory; Accidental event; Earthquake resistance.

Download PDF version Here

 

 

Introduction
Research
Application
Teaching
Publications
Download
Issues
Others

Our Lab

Collapse Prevention Committee