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- 검색키워드
- 저자 : Liqiang Jiang (검색결과 3 건)
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Fundamental period estimation of steel frames equipped with steel panel walls
Liqiang Jiang,Xingshuo Zhang,Lizhong Jiang,Chang He,Jihong Ye,Yu Ran 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.6
Steel frames equipped with beam-only-connected steel panel wall (SPWF) system is one type of lateral resisting systems. The fundamental period is necessary to calculate the lateral force for seismic design, however, almost no investigations have been reported for the period estimation of SPWF structures, both in theoretically and in codes. This paper proposes a simple theoretical method to predict the fundamental periods of the SPWF structures based on the basic theory of engineering mechanics. The proposed method estimates the SPWF structures as a shear system of steel frames and a shear-flexure system of SPWs separately, and calculates the fundamental periods of the SPWF structures according to the integration of lateral stiffness of the steel frames and the SPWs along the height. Finite element method (FEM) is used to analyze the periods of 45 case steel frames or SPWF buildings with different configurations, and the FEM is validated by the test results of four specimens. The errors cannot be ignored between FEM and theoretical results due to the simplifications. Thus the finial formula is proposed by correcting the theoretical equations. The relative errors between the periods predicted from the final proposed formula and the results of FEM are no more than 4.6%. The proposed formula could be reliably used for fundamental period estimation of new, existing and damaged SPWF buildings.
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Experimental Investigation of Composite Steel Plate Deep Beam Infill Steel Frame
Liqiang Jiang,Hong Zheng,Yuan Liu,Xiaosa Yuan 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
Steel frame and shear wall infill steel frame are two commonly lateral load resisting systems used in building structures. Torealize the modulation of initial stiffness of steel structures, make it easily assembled and removed and prevent plastic hingesdeveloping in the frame columns and collapse of all structure, a new anti-seismic infill wall system, composite steel plate deepbeam (CDB), is introduced. The system uses steel plate deep beam with a precast reinforced concrete panel attached one side. This paper describes the experimental work related to the tests of CDB under cyclic loads. The experimental results of one puresteel frame (PF) and two composite steel plate deep beam infill steel frame (CDBF) with different span-height ratio aresummarized and discussed, the hysteretic loops were obtained. Based on the test results, effects of the CDB on the load capacity,ductility, hysteretic property and energy-dissipation of the pure steel frame were analyzed. The results show that the CDBenhances the initial stiffness and load capacity by a large margin, and the hysteretic loops are replete and the skeleton curveshave apparent stage of plastic flow, the ductility and energy dissipation capacity of the test specimens are enhanced. Lastly,regression analysis based on the tests data, and restoring force model can apply to elastoplastic response analysis of the CDBFsystems. Therefore, the deep beam can be used as the first defense line of earthquake-resistance, and the steel frame can beused as the second.
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Rui Jiang,Liqiang Jiang,Yi Hu,Jihong Ye,Lingyu Zhou 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.74 No.6
The fundamental period is an important parameter for seismic design and seismic risk assessment of building structures. In this paper, a simplified theoretical method to predict the fundamental period of masonry infilled reinforced concrete (RC) frame is developed based on the basic theory of engineering mechanics. The different configurations of the RC frame as well as masonry walls were taken into account in the developed method. The fundamental period of the infilled structure is calculated according to the integration of the lateral stiffness of the RC frame and masonry walls along the height. A correction coefficient is considered to control the error for the period estimation, and it is determined according to the multiple linear regression analysis. The corrected formula is verified by shaking table tests on two masonry infilled RC frame models, and the errors between the estimated and test period are 2.3% and 23.2%. Finally, a probability-based method is proposed for the corrected formula, and it allows the structural engineers to select an appropriate fundamental period with a certain safety redundancy. The proposed method can be quickly and flexibly used for prediction, and it can be hand-calculated and easily understood. Thus it would be a good choice in determining the fundamental period of RC frames infilled with masonry wall structures in engineering practice instead of the existing methods.
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