波纹板加强K型方钢管节点抗倒塌性能有限元分析

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AbstractTo improve the collapse resistance of steel trusscoal conveying trestle，a novel type of joint is formed to strengthen K-shaped square steel tube joints by welding corrugated plates at the joints between the chord and brace members.On the basis of verifying the correctness of the finite element model，the numerical calculation model of 112 new K-shaped square steel tube joints reinforced by corrugated plate was established， the failure mode of the joints under different parameters was studied，and the law of influence of each parameter on the anti-collapse performance of the joints was revealed.The results show that the failure modes of the new corrugated plate reinforced joint can be divided into shear failure of the chord and buckling of the compression support under unbroken rots and shear failure of the chord and buckling of the compression support under broken roots.Chord width ratio and corrugated plate thickness are positively correlated with joint stiffness，ultimate bearing capacityand failure load.Whenthe diameter to thickness ratioof the chord is less than O.75，the ultimate bearing capacity of the joint can be significantly improved by increasing the thickness of the support.The curvature of corrugated plate has litle influence on the joint stiffness and ultimatebearing capacity，but has great influenceon the failure mode of the joint.Theultimate load，failure load and ductility of K-type joints are significantly improved by corrugated plate，which can fectively improve the anti-collapse performance of K-type joints.

KeywordsK-shaped square steel tube joint，corrugated plate，collapse-resistant behavior，ultimate load analysis

0 引言

建筑结构在突发事件下的连续倒塌问题已引起社会各界的广泛关注[。（剩余8060字）