Anti-seismic Performance Test On Steel-bamboo Composite Beam-column Exterior Joints

Structure members combinated by cold-formed steel and bamboo plywood can unleash eachadvantage of the steel and bamboo togethered through structural adhesive, and the two materialshave a good combination, to some extent, this composite structure overcome the drawback ofpremature buckling instability of cold-formed steel. At the same time, the combination of thesetwo materials have easy access to various sections form of structural members, meet the demandof various forms of modern building structures. Currently, researchers have studied the thin-wall CSteel-bamboo plywood composite column, cold-formed steel and bamboo plywood compositeI-section beam, hin-wall C Steel-bamboo plywood composite floor, cold-formed steel andbamboo plywood composite wall by laboratory tests. This article conductes a series of anti-seismicperformance test on steel-bamboo composite beam-column exterior joints, and this test canPromote establishment and promotion of the steel-bamboo composite structure system.The exterior joints of I-section steel-bamboo composite beam and box steel-bamboocomposite columns achieve connection between beams and columns by T-stub and bolt. In orderto increase the joint’s stiffness and overall performance, the joint specimens are welded steelaround columns of core area’s joints. Taking the bolt strength, the number of bolts, with or withoutstiffener as variables, quasi-static tests were performed on6composite beams-columns exteriorjoints to observe joint’s load-displacement hysteretic curves and displacement meter readingsbetween beams and columns and steel’s strain change of joint core areas, and this paper acquiredcomposite beam-column exterior joints’ ductility, dissipative coefficient, and other indictors aboutseismic performance, and also acquired beam-column joints’ relative corner, shear deformation ofjoint core areas and other indictors about mechanical performance.The result shows that changes of strength class of bolt and the number of bolts have littleeffect on maximum load capacity and joint core areas’ shear deformation of beams-columns joints,but that changes of stiffener and weld size of steel tube make very sharp differences to cornerstiffness and indictors about seismic performance. This article analysis the force model and failuremechanism of the steel-bamboo composite beam-column exterior joints based on the test results.On this basis, article propose heoretical angle formula of the connection in node area, and thecalculated values of connector corner used the formula match well with the experimental ones.According to the M-θhysteresis curve of test, article propose the simplified mathematical model.At the same time, article analysis6combination nodes by simulating of the software of ANSYS.The result of specimen yielding capacity play a reference role on calculation the steel-bamboocomposite beam-column exterior joints in the applications of practical engineering. In the last,article propose reasonable proposals of design of the steel-bamboo composite beam-columnexterior joints. Test results reveal that the joints of steel-bamboo composite beam and columns connected byT-stub and bolt work well, which have higher ultimate bearing capacity, stiffness and excellentductility, can meet the basic requirements of anti-seismic capacity and promote the use of thisstructure in the practice project.