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Huang Z.,Jiangsu Province Key Laboratory of Structure Engineering | Huang Z.,Nanjing Southeast University | Li Z.,Nanjing Southeast University | Ding T.,Jiangsu Posts and Telecommunications Planning and Designing Institute Co.
Applied Mechanics and Materials | Year: 2013

This article introduces a novel buckling restrained brace (BRB) whose core members are restrained by transverse restraints which consists of two lines of parallel square tubes at both sides of the core member. Three different types of BRB are cyclically loaded in the investigation, using different restraining mode and steel types for the core members. Results of the experiment indicate that the transverse rib restraining mode is able to achieve expected effects. BRB specimens with LYP160 core member exhibit relatively better hysteresis performance than specimens with Q235 core member. © (2013) Trans Tech Publications, Switzerland.


Gu D.,Jiangsu Province Key Laboratory of Structure Engineering | Gu D.,Jiangnan University | Wu G.,Nanjing Southeast University | Wu Z.,Nanjing Southeast University | Wei Y.,Nanjing Southeast University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

The experimental results indicate that the shear strength of reinforced concrete (RC) columns reduced with the increase of flexural ductility for displacement ductility factors in excess of 2. In order to have good ductility, the shear force generated during earthquakes should be less than the final shear strength of RC columns. Exiting design expressions for shear strength of circular columns are discussed and compared with the results of 31 circular columns tested under simulated seismic loading. It is shown that existing code design equations are very conservative for shear strength, however, the model proposed by Priestly, which can consider the influence of the flexural ductility on shear strength, has good precision. It is also found that the calculated results from China design code equations compares well with the final shear strength from Priestly model, and both can be used to calculate the final shear strength of RC columns.


Xiong Z.-M.,Xi'an University of Technology | Xiong Z.-M.,Jiangsu Province Key Laboratory of Structure Engineering | Xiong Z.-M.,State Key Laboratory of Architecture Science and Technology in West China XAUAT | Zhang P.-P.,Xi'an University of Technology | And 3 more authors.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2012

A large amount of calculation and complex analysis is involved in the nonlinear seismic response analysis of the multi-DOF shear structure isolation system with the energy method, not ready for use in engineering practice. In order to solve these problems, this paper, through its analysis of free vibration equation, finds an equivalent system to simplify the solution of the isolation system. And the influence of three elements of near-fault ground motion on the total input energy was simply analyzed. Finally, a five-storey framework isolation structure model under the action of earthquake is respectively analyzed by energy method and the simplified calculation method Compared with the results, it shows the method proposed is rather safe, which also provides the reference for the seismic design of the project.


Cai X.,Suzhou University of Science and Technology | Cai X.,Jiangsu Province Key Laboratory of Structure Engineering | Tian S.,Suzhou University of Science and Technology | Tian S.,Jiangsu Province Key Laboratory of Structure Engineering | Tian S.,Harbin Institute of Technology
World Information on Earthquake Engineering | Year: 2014

MTS electro-hydraulic servo loading system is widely used in civil engineering structure laboratory at home and abroad, this paper presented a kind of seismic pseudo-dynamic testing method based on internal command control. According to the comparative analysis of MTS system hardware configuration and software configuration, the ways and characteristics based on internal command control were expounded, and the connections with NetSLab platform were conducted, then the test system was established. A single degree of freedom seismic test of cantilever steel column was carried out, the tester results were preferably identical with the results of controller, and the results confirm the established system capable of pseudo-dynamic testing. The experiments demonstrate that the proposed internal command control method is feasible and effective, which can provide reference for the related research. ©, 2014, Science and Technology Periodical Press. All right reserved.


Cai X.,Suzhou University of Science and Technology | Cai X.,Jiangsu Province Key Laboratory of Structure Engineering | Lu X.,Suzhou University of Science and Technology | Tian S.,Suzhou University of Science and Technology | And 2 more authors.
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2014

It was difficult to simulate the local complex mechanical properties of structure accurately with existing numerical elements. A method was proposed to construct multi-scale hybrid model integrate with experimental elements. Under the premise of didn't lose the interface degree of freedom, multi-point constraint was used to coordinate the boundary between shell or continuum element of abaqus models with experimental element. A seismic hybrid test with two-span two-storey planar steel frame was conducted based on OpenFresco platform, and the bottom interior column served as the experimental element. Compared with finite element analysis, the results show that multi-point constraint can realize the boundary deformation coordination among different scale elements effectively. The experimental element can simulate mechanical properties of key position of structures truly and directly. Under the premise of meeting the precision of engineering application, the multi-scale hybrid model can save computational resources and time. The research provides a new way for improving the reliability of structures seismic analysis. ©, 2014, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.


Cai X.,Suzhou University of Science and Technology | Cai X.,Jiangsu Province Key Laboratory of Structure Engineering | Tian S.,Suzhou University of Science and Technology | Tian S.,Jiangsu Province Key Laboratory of Structure Engineering | Tian S.,Harbin Institute of Technology
Journal of Earthquake Engineering and Engineering Vibration | Year: 2014

Seismic test is an important method to explore the structure seismic performance. This paper carries out a preliminary research of seismic hybrid simulation combined with finite element analysis. We conduct a seamless connection between OpenFresco open source experimental platform and MTS electro-hydraulic servo loading system based on CSIC and MATLAB, and then establish a MTS-OpenFresco-MATLAB hybrid simulation system initially. Several key problems during system construction, such as the establishment of data channel, the reduction of degree of freedom and boundary condition imitation of experimental element,and others are presented in detail. A verification test with a two-storey and single span planar steel frame is conducted in order to test the system performance. The single column on the left is taken as the experimental element and the single column on the left and the beam are taken as the calculative element. The results are compared with finite element results. The results show that the system is smooth circulation, stable and effective, and can be accurately reflect the mechanical properties of complex parts in structures.


Tang B.-J.,Jiangsu University of Science and Technology | Tang B.-J.,Jiangsu Province Key Laboratory of Structure Engineering | Wang F.,Jiangsu University of Science and Technology | Ma J.,Jiangsu University of Science and Technology
Journal of Donghua University (English Edition) | Year: 2014

To improve wind resistance capacity of cable-braced steel portal frames, a double-braced portal frame was proposed by adding two pre-stressed knee braces to a cable-braced portal frame. To study the reasonable range of application and method of cable parameter determination for this novel structure, the influences of load condition, span, base constraint, and cable parameters on structural performance were investigated by using the finite element code SAP2000. The results show that pre-stressed knee braces can effectively resist both uplifted and lateral wind loads, so this cable-stayed and knee-braced steel portal frame is suitable for large wind. When the vertical load is comparable with the wind load, this novel type of portal frames is suitable for a medium span (21-48 m). The cables in the cable brace can be determined by structural vertical stiffness, and the cables in the knee brace can be designed as the same as those in the cable-stayed part for the reason that their cross sectional area has only a weak effect on the structure. If no cable fails, the pretension variation of the cable does not affect the stiffness of the portal frame. The cable in the cable brace, working together with the cables in the knee braces, can ease uneven distribution of internal force, and their pretensions can be determined according to actual engineering projects. Copyright © 2014 Editorial Department of Journal of Donghua University.

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