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- 검색키워드
- 저자 : Zhanzhong Yin (검색결과 3 건)
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Seismic Performance Analysis of Buckling-Restrained Braced Steel Frames with Ductile Castings
Zhanzhong Yin,Bo Yang,Shuzhen An 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.10
Buckling-restrained brace (BRB) steel frames with ductile castings are proposed to solve the fracture failure of welded joints between buckling-restrained braces and frames after rare earthquakes. In this paper, quasi-static tests are conducted on two one-story, one-bay steel frames to study their mechanical behaviors, including stress distribution, failure mode, energy dissipation, and skeleton curve, and finite element models are established for verification. Subsequently, 22 models with different parameters of the BRB steel frames with ductile castings are analyzed using ABAQUS. Results indicate that the new frame system has good energy dissipation; it can confine the inelastic deformation of the structure to the ductile castings and BRB. It also satisfies the 1/50 maximum elastic-plastic drift angle set by the Code for Seismic Design of Buildings. The BRB with ductile castings connected to the frames by bolts can relieve the stress distribution in the beam–column region, which can be assembled and replaced after the earthquake.
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Zhanzhong Yin,Zhaosheng Huang,Hui Zhang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.3
The steel plate shear wall structure has excellent seismic performance, mainly consists of embedded steel plate, horizontal boundary elements (HBEs) and vertical boundary elements (VBEs). Under the action of additional bending moment, the VBEs of SPSW often produce the failure mode of “hourglass specimen”. As a solution, the SPSWs proposed in this paper adopts PEC columns, which are composed of concrete filled between flanges of thin-wall channel steel, and transverse steel bars welded between flanges to prevent it from buckling. A slow cyclic test was conducted on two specimens of 1/3-scaled prefabricated SPSWs with thin steel plate composite section PEC column. According to the validated finite element method, the parameters including the height-thickness ratio of filled steel plate, concrete strength grade, bolt spacing and axial compression ratio were also studied. The results show that the new structure has high bearing capacity and good ductility. In addition, the PEC column has enough stiffness to form a good anchoring effect for the inner steel plate. The inner steel plate fully yields after buckling and provides bearing capacity and energy consumption through the action of tension field. The peak load of specimens with concrete has a higher level approximately 18% than the no-concrete specimen. The height-thickness ratio has a great impact on the post buckling performance of SPSWs. With the increase of height-thickness ratio, the ultimate bearing capacity of the structure will increase by 10% − 30%. Moreover, to give full play to the outstanding performance of prefabricated SPSW with PEC column, the value range of bolt spacing is suggested to be in the range of 120 mm − 60 mm.
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Experimental study of beam-column connections with web opening in a low-rise steel frame
Wang, Xiuli,Yin, Zhanzhong,Li, Qingfu,Shen, Shizhao Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.3
Steel frame structures have been widely used in multi-storey and high-rise buildings and the connections in these structures are critical. In the Northridge and Kobe Earthquake, beam-column connections suffered damage due to brittle fracture. According to seismic design codes, ductility of the beam to column connection is also necessary. A study on the behavior of a beam to column connection with the aim of improving ductility as well as preventing brittle failure was carried out. In order to control the position of a plastic hinge on the beam, a connection with a hole in the beam web was developed. Five specimens with different parameters under cyclic load were assessed. The results are presented in terms of the stress distribution of the beam, hysteretic behavior, and ultimate capacity. Furthermore, the finite element method was also used to analyze the model, and the results were compared with those obtained from the experiment. It is shown from the analysis and experimental results that this type of connection is effective in terms of improving ductility for a beam to column connection in low-rise buildings.
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