Experimental Research on Hysteretic Behavior of High-Strength Steel CHS T-Joints Under Axial Loads
In order to study the hysteretic behavior of high strength steel circular hollow section(CHS)T-joints under axial loads,five high-strength steel CHS T-joints under brace axial reciprocating loads with dif-ferent outer diameter ratios of brace to chord were investigated experimentally and numerically.The hyster-etic curves,skeleton curves,energy consumption,ductility and failure modes were analyzed,focusing on the effects of geometric parameters.The results showed that the failure mode of the joints under brace axial reciprocating loads was that the chord wall cracked near the crown area at the intersection line of braces and chords before the cracks expanded along the main pipe cross section,which was different from that of joints made of ordinary strength steel.The hysteretic curve of each joint was full shuttle shape which reflected good seismic performance for the high-strength steel CHS T-joints.The research also showed that the speci-mens with the same chord section expressed similar shape of the hysteretic curve,and the chord section was one of the main factors affecting the hysteretic behavior of this type of joints.The failure modes,hysteretic curves and skeleton curves of the joints calculated by finite element analysis were in good agreement with the test results,the finite element models established in the paper could well simulate the axial hysteretic behav-ior of high-strength steel CHS T-joints.
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