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RISS 인기검색어
- 검색키워드
- 저자 : Yangzheng Cai (검색결과 2 건)
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Capacity Difference of Circular Hollow Section X-joints Under Brace Axial Compression and Tension
Bida Zhao,Chengqing Liu,Zeyang Yao,Yangzheng Cai 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.5
In the current regulations, there are two methods to describe the relationship between the two capacities of circular hollow section (CHS) X-joints under brace compression ( N uc ) and brace tension ( N ut ): N ut = N uc and N ut = fN uc ( f is a coeffi cient larger than 1.0). In order to study the diff erence between N uc and N ut of the X-joints, two experimental tests (monotonic compression load and cyclic axial load) and fi nite element (FE) analysis are performed to study the diff erence between N uc and N ut . Test results show that the ultimate capacity is close to the resistance load corresponding to the connection deformation of 3% of chord diameter (limit deformation criterion). Both two specimens showed good deformability and ductility. The fi nal failure modes are chord wall buckling and chord wall tearing for the specimens under monotonic compression load and cyclic axial load, respectively. Test and FE results indicate that N ut is signifi cantly larger than the corresponding N uc , and the ratio N ut / N uc increases as the chord radius-to-thickness ratio γ increases. It is also found that the ratio N ut / N uc increases as the brace-to-chord diameter ratio β increases, especially β larger than 0.8. Based on test and FE data, a new equation for the ratio N ut / N uc is proposed to overcome the defect of the current specifi cations that cannot consider the infl uence of β . The equation is proved to be reasonable by tests and FE results.
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Semi-rigidity Connection Model for Unstiff ened CHS X-type Joints Subjected Out-of-plane Bending
Bida Zhao,Chengqing Liu,Zhengxi Yan,Xin Chen,Yangzheng Cai 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
Mechanical performance of unstiff ened circular hollow section (CHS) multi-planar X-joints subjected two diff erent directions (sagging and hogging) of out-of-plane bending moment (OPBM) was analyzed. A seven-parameter exponential function model, which describing semi-rigidity behavior (moment-rotation curves) of the X-joints subjected sagging and hogging OPBM, was proposed, and then the method to obtain the values of each parameters in the seven- parameter model was also proposed. Based on the results of FE parametric analysis, formulas for parameters in the seven-parameter model were established combined with multiple nonlinear regression analysis. FE and test results were used to verifi ed the seven-parameter model. The results indicated that: the seven-parameter model can well refl ect the semi-rigidity behavior of CHS multi-planar X-joints subjected to OPBM.
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