Study On The Performance Of A New Type Of Semi-rigid Joint For Single-layer Latticed Shell

Single-layer latticed shell have been increasingly widely used because of its reasonable force,economic materials and beautiful shape,etc.The relevant specification,based on safety considerations,specifies that the analysis of a single-layer latticed shell should assume that the joint is rigid connection.But in fact,the joint of latticed shell is semi-rigid.If the joints are treated as completely rigid or fully articulated,the actual carrying capacity of the structure will be estimated too high or too low,which is harmful to the economy and safety of the building.Compared with the rigid joint,semi-rigid joint has a certain rotation capacity and compared with the articulated joints,it has a certain flexural rigidity.It has the advantages of convenient assembly and beautiful appearance.Therefore,it is of important theoretical significance and practical value to carry out further research on semi-rigid joint performance and apply it to single-layer reticulated shell.In this paper,a new type of cutting hollow cylinder joint is conceived and designed,which is assembled by bolts and is a semi-rigid joint.The experimental study on two cases of radial loading and circumferential loading is carried out in order to analyze the performance of the joint in the single-layer latticed shell along the radial and circumferential directions.The load-displacement curves,the stress-variation curves and the bending moment-rotation curves of the joints are obtained.The stress mechanism and failure mode of the joint are analyzed.The initial stiffness values and ultimate flexural capacity values of the radial and circumferential directions of the joint are obtained.The similarities and differences between radial and nodal ring performances are compared.This provides an analytical approach and experimental basis for further research on the performance of hollow cylinder joints and other semi rigid joints.On this basis,the finite element simulation of the radial and circumferential joints of the hollow cylinder semi rigid joints is performed by using the ABAQUS finite element software.The force acting mechanism of the numerical model is in good agreement with the actual test.In order to further study on the performance of joint,the model improves the deficiency of the test joint when the bolt preload limitations,the numerical simulation results show the bearing joint can improve performance,bar strength has been more fully utilized.Then,the influence of various parameters on the performance of the joint is analyzed.It is found that the bolt diameter and bolt pretension have some influence on the radial and circumferential performance of the joint in a certain range,and the law is consistent.In addition,there is a more obvious stress concentration at the reserved installation hole,so that the bearing capacity of the joint is obviously decreased.In this paper,the performance of a new type of hollow cylinder semi-rigid joint is comprehensively grasped by experiment and numerical simulation.