In-plane stability of rectangular cross-section two hinge spatial truss arch
This article mainly studies the in-plane stability of rectangular cross-section circular steel pipe spatial truss arc arches,including the study of first-order elastic buckling in the plane,elastic-plastic stability bearing capacity,and instability mechanism.Firstly,the formula of the first-order global elastic buckling load of the arch considering shear deformation is introduced,and the applicability of the formula is verified by the finite element method.Secondly,the in-plane stability bearing capacity of spatial truss arches under radial uniform load,full-span vertical uniform load,and half-span vertical uniform load is studied.The stability curve and design formula of spatial truss arches are obtained by introducing a normalized slenderness ratio and reduction factor,which lays a foundation for the bearing capacity design method of truss arches under compression-bending load.The results show that the global stability performance of the arch can be evaluated by referring to the c column curve in Standard for design of steel structures.The failure modes and mechanisms of space truss arch under the joint action of axial force and bending moment are analyzed.The results show that the failure modes can be divided into global instability,chord local instability and transverse tube local instability,in which chord and transverse tube local instability can significantly reduce the bearing capacity of arch.
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