Tests for aseismic performance of welded joints between flange-connected square steel tube column and truss

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 200-211.

LIU Xuechun1,2, WANG Yue1, ZHANG Ailin1

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Abstract

Here, six full-size welded joints between flange-connected square steel tube column and truss with different beam cross-section sizes were studied through low cycle repeated load tests and finite element analysis (FEA). Upper and lower steel tube columns and column base were connected onsite with flanges and high-strength bolts, and the column base and truss beam were welded in factory with vertical connection plates, flanges and axillary plates to form welded joints. This kind joints could be applied in prefabricated multi-story and high-rise steel structures to realize onsite full assembly with bolts. The test results showed that the cross-section size of truss beam has little influence on the failure mode of joints, the joints with axillary plates are all failed due to repeated loading causing tearing of truss chord members, there are good plastic deformations developed before failure, and the root weld of joints without axillary plate is fractured; joints with axillary plate have better ductility, ultimate load-bearing capacity and energy-dissipation capacity, and their plastic rotating capacity is larger than the minimum requirement of 0.03 rad in aseismic code; truss beam cross-section size significantly affects joints’ mechanical performances, the larger the chord section size, the higher the ultimate load-bearing capacity; the section size of web member has little influence on the ultimate load-bearing capacity, the larger the web section size, the better the ductility of joints and the stronger the energy dissipation capacity of joints; the change of bolt tension at column flange is extracted using finite element software, the column-column flange connection can be approximately rigid; the simplified calculation formulas of joints’ yield load and ultimate load are derived.

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prefabricated steel structure / flange connection / aseismic performance / truss beam cross-section size / ultimate load-bearing capacity

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LIU Xuechun, WANG Yue, ZHANG Ailin. Tests for aseismic performance of welded joints between flange-connected square steel tube column and truss[J]. Journal of Vibration and Shock, 2021, 40(19): 200-211

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