Research On Connection Joint Of Prefabricated Steel Structure Building Envelope

With the rapid development of China’s construction industry,the development of prefabricated building and the realization of building industrialization has become a new way of high-quality development of the construction industry,and actively cultivate the development and design of building parts and realize technological innovation is an important link.Prefabricated steel structure building is an important part of prefabricated building,and the wall panel and the corresponding connecting node are the key components of the system.Prefabricated steel structure building enclosure wall board has the advantages of convenient standardization,convenient production and transportation,flexible arrangement and simple construction installation.But the current structural design of wall panel in the main structure stress is considered not participate in force in the process of transmission,ignoring the containment system effect on the bearing capacity and the seismic performance of the whole structure,and the retaining wall and the main structure of the connection methods mostly adopt rigid connection,palisade structure under seismic action can limit the main structure of the elastic-plastic deformation,As a result,the deformation of the two is not coordinated,which is not conducive to the seismic performance of the whole frame.Therefore,this paper intends to design a new type of connection node which can realize the flexible connection between the enclosure panel and the main body of the assembled steel structure,so as to improve the seismic performance of the connection system between the enclosure panel and the main body of the structure,so as to ensure the safety of the assembled steel structure building.The main work and conclusions of this paper are as follows:1.A new type of joint is designed for connecting the main body of assembled steel structure to the wall panel.2.Select appropriate concrete and steel constitutive models,conduct finite element analysis on known tests,co MPare simulation results with test results,verify correctness and reliability through the degree of agreement between the two,and determine the feasibility of the calculation and analysis method of the selected model.3.With the new connection node of different diameter hole spacing ratio and different thickness of wall panel in order to establish the finite element model parameters,get model under reciprocating load damage,hysteresis curves,skeleton curves and the simulation results of stiffness degradation curve,the ultimate bearing capacity of steel frame structure is analyzed,the influence of the mechanical properties such as stiffness and stress components.The results show that the reasonable limit holes have a good cushioning effect on the overall bearing capacity of the wall panel,and the overall horizontal bearing capacity is improved compared with the model without limit holes.The change of ALC wallboard thickness will affect the size of wallboard stress,smaller ALC wallboard thickness is conducive to improve the seismic level of the overall structure,horizontal bearing capacity and overall stiffness will also increase.4.Based on the new connection node of different intensity and diameter of the bolt to establish finite element model,get hysteresis curves,skeleton curves and the simulation results of stiffness degradation curve under reciprocating load damage,the ultimate bearing capacity of steel frame structure is analyzed,the influence of the mechanical properties such as stiffness and stress components.The results show that the overall structure with lower bolt strength has larger horizontal bearing capacity,the best ductility,and the stiffness degradation curve is more moderate.With the increase of bolt diameter,the energy dissipation capacity of the whole structure decreases slightly,while the change of bolt diameter has no significant effect on the horizontal bearing capacity and stiffness degradation of the whole structure.