Performance Of Cutting Hollow Cylindrical Joints And Performance Of Single-Layer Spherical Latticed Shells

Cutting hollow cylindrical joints is assembled by bolts.Because it has the characteristics of convenient construction and beautiful shape,it has great engineering application value.When designing single-layer reticulated shells,the bolted joints are often conservatively treated as articulated joints.On the other hand,the low bearing capacity of articulated single-layer reticulated shells limits the application of such joints in single-layer reticulated shells.However,experiments have shown that the cutting hollow cylindrical joints have good flexural capacity.It is a typical semi-rigid joint.In this paper,the mechanical properties of cutting hollow cylindrical joints and the effect of it on the integral reticulated shells are studied.The main research contents include the following aspects:(1)Firstly,the finite element model of joints is established accurately by using ABAQUS software.The validity of the joint finite element simulation method is verified by comparing the simulation results with the experimental ones.Using this method,orthogonal experiments are designed for eight influencing factors of the joint.The variation of initial rotation stiffness and ultimate bending moment with bolt diameter,bolt yield strength,bolt spacing,taper head height,taper head width,taper head thickNess,steel yield strength and axial bending stress ratio were investigated.On this basis,the fitting formulas of moment-rotation curves in radial direction and circumferential direction of nodes are given.In addition,the error analysis and the verification of an example show that the formula can meet the engineering requirements.(2)Cutting hollow cylindrical joints are introduced into single-layer reticulated spherical shells.The parameter analysis of the whole process of elastic-plastic cutting hollow cylindrical node three-dimensional reticulated spherical shells is carried out.The buckling modes,load-displacement curves and ultimate loads of reticulated shells are also studied.The variation of static stability bearing capacity of reticulated shells with connection type,load distribution,initial defect,span and rise-span ratio,section size and temperature of members is obtained.A comprehensive understanding of the static stability of three-dimensional reticulated spherical shells with hollow cylindrical joints(3)Firstly,the modal parameters of three-dimensional reticulated spherical shells with hollow cylindrical joints are analyzed.The variation of natural vibration characteristics of reticulated shells with node type,span and rise-span ratio,initial defect,section size of members and roof quality is investigated.Based on the understanding of the dynamic characteristics of reticulated shells with semi-rigid joints,the dynamic stability parameters of it are analyzed.The time history curve of nodal displacement,the deformation of reticulated shells and the critical load of dynamic stability are also studied.The dynamic stability of reticulated shells varies with node type,span and rise-span ratio,section size of members,damping,roof quality and initial defects.The dynamic stability of three-dimensional latticed spherical shells with hollow cylindrical joints is comprehensively mastered.