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Ye Y.,Nanjing University of Technology | Ye Y.,Jiangsu Green Building Research Center | Sun R.,Nanjing University of Technology | Sun R.,Zhong Hang Tian Construction Engineering Co. | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

With quasi-static tests, the seismic performance of five precast NC composite shear walls infilling SCC and two precast NC composite shear walls infilling NC were studied. The effects of wall boundary element, axial compression ratio, and insulating layer were considered. The bearing capacity, failure pattern, hysteretic loops, skeleton curves, rigidity degradation curves, ductility and energy dissipation of precast NC composite shear walls infilling SCC were investigated. The two types of composite shear wall were compared infilling SCC and NC. The results indicate that the precast composite shear walls infilling SCC have good seismic behavior. The prefabricated parts and the cast-in-place SCC parts of the composite shear walls with steel support can work together in coordination very well under loading. The carrying capacity of composite shear wall infilling SCC is not lower than that infilling NC. The failure mode, crack distribution, hysteretic curve, energy dissipation capacity and stiffness degradation for two types of composite shear wall are similar. The ductility of the precast composite shear walls infilling SCC is a little better than the precast composite shear walls infilling NC. Increasing axial compression ratio from 0.1 to 0.2 will help improving the carrying capacity of walls. Using the embedded column will improve the whole performance of the precast composite shear walls infilling SCC. Source


Yang H.,Nanjing University of Technology | Liu W.,Nanjing University of Technology | Lu W.,Nanjing University of Technology | Zhu S.,Jiangsu Green Building Research Center | Geng Q.,Kingdom Architecture Design
Construction and Building Materials | Year: 2016

This paper describes an experimental test program and theoretical analysis which examines the reinforcing in flexure of glued laminated timber (glulam) beams using fiber reinforced polymer (FRP) and steel materials. A series of four-point bending tests were conducted till failure on both unreinforced and reinforced Douglas fir glulam beams in a simply-supported scheme. The focus of this research was to evaluate the effects of reinforcing materials, reinforcement ratio and arrangement on the flexural behavior. Test results showed that the flexural capacity, flexural global stiffness and timber tensile strain at failure were all improved considerably for reinforced timber beams when compared to the unreinforced control beams, in which the average improvement reached 56.3%, 27.5% and 49.4%, respectively. On the bases of the experimental results, a theoretical model was proposed to predict the flexural capacity and flexural stiffness of the reinforced timber beams. Most of the differences between theoretical and experimental results for both flexural capacity and flexural stiffness were within 10.0%, which showed a high accuracy of the proposed model. Subsequently a parametric analysis, which includes the axial stiffness ratio of reinforcement to timber, the relative location of tensile reinforcement, and the strength ratio of reinforced timber between flexural tension and compression, was undertaken to investigate the effects of the influential factors for both flexural capacity and flexural stiffness. © 2015 Elsevier Ltd. All rights reserved. Source


Wei J.,Jiangsu Green Building Research Center | Wei J.,Tongji University | Li G.,Tongji University | Duan X.,Nanjing Tianhua Bairun Investment Development Co. | Qu H.,Tongji University
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2012

Cable parameter identification in a cable structure is very critical in both construction and maintenance of the structure. A new parameter identification method is presented, and it can accurately identify the cable parameters, such as cable tension and flexural stiffness based on finite element model (FEM) and system identification technology. Considering the effects of sagging, flexural stiffness, tension, boundary conditions, and flexibility support, three-node-beam-element FEM is formed to study nonlinear vibration of cables. An eigen value sensitivity matrix is obtained from the first-order Taylor series expansion of the non-dimensional eigenvalues with respect to the parameters to be identified. The equations relating the parameters identified to the differences between the analytical and the measured frequencies are established. The parameters can be determined accurately through the proposed equations in a new iterative fashion. The precision of the identified parameters and the convergence are enhanced. The numerical and experimental study is conducted to verify the identification method. Source


Li G.,Tongji University | Wei J.,Tongji University | Wei J.,Jiangsu Green Building Research Center | Zhang K.,Tongji University | Zhang K.,Fujian Provincial Institute of Architectural Design and Research
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

This paper presents a systematic approach to estimate the cable tension when flexural stiffness and flexibility support is taken into account. To estimate the cable tension accurately, a theoretical model considering flexural stiffness and flexibility support is formulated, and formulas for estimating cable tension and boundary conditions are obtained. When the flexibility support stiffness is infinite, the formulas are the same as the formulas when the influence of flexibility support is counted. Three experiments of flexibility support stiffness were conducted to verify the estimation approach, and the experimental results showed that when the flexibility support stiffness is small, the cable tension estimation deviated significantly from the actual cable tension, and that the formula considering flexural stiffness and flexibility support stiffness can estimate the cable tension accurately. Source


Wei J.,Jiangsu Green Building Research Center | Wei J.,Tongji University | Li G.,Tongji University | Duan X.,Nanjing Tianhua Bairun Investment Development Co. | Jiang-Xia Z.,Jiangsu Green Building Research Center
Journal of Earthquake Engineering and Engineering Vibration | Year: 2011

This paper presents a systematic approach to estimating the cable tension, when flexural stiffness, rotational end restraints and elastic support are taken into account. To estimate the cable tension precisely, the theoretical model considering flexural stiffness, rotational end restraints and elastic support is formed, then the formulas to estimate cable tension and boundary conditions are found and when the elastic support stiffness is infinite, the formulas are the same as the formulas that do not account for the influence of elastic support. Three elastic support stiffness experiments are conducted to verify the estimation approach, and the experiments' results show: when the elastic support stiffness is small, the estimated cable tension deviates from the actual cable tension; the formula considering flexural stiffness and elastic support stiffness can estimate the cable tension precisely. Source

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