Research On The Performance Of Bolted Joint In Modularized High-rise Buildings

In recent years,the country has vigorously advocated and promoted building assembly,among which modular buildings represent the highest technical level in this field.Relevant scholars have carried out research on various module connection methods including bolt connection,welding connection,cast steel node connection,etc.,among which bolt connection is widely used due to its convenient disassembly and construction convenience.Based on the related bolt connection technology,this paper proposes a new type of bolt connection between modules,uses multi-scale modeling to verify the rationality of its rigid connection simplification,and further studies the feasibility of its application in high-rise modular buildings.Based on the analysis of the existing modular unit bolt connection node forms,a new type of bolt connection node between modules suitable for high-rise modular buildings is proposed.The relevant components,key dimensions and installation process of the node are described in detail,and the design and verification methods of the key parts of the node,including connecting plates,bolts,cast steel shear keys and steel bars,are given.Established a new type of bolted connection node entity model in ABAQUS,studied the static performance and hysteretic performance of the node,and found that the node satisfies the design requirements of "Strong nodes and weak componentsr" and "strong column and weak beam",and has good energy consumption capacity.And plastic safety reserve.A simplified node model is established by using beam elements in ABAQUS.By comparing the mechanical properties and failure modes of the solid model with the simplified model of rigid connection and hinged connection,the rationality of simplifying the node to the rigid connection form in the overall model is proved.The modular building system has a double-beam form,and there is a problem that the cast steel shear bond at the end of the column will affect the length coefficient of the column.Therefore,this paper uses the fourth-order differential equation method to establish a theoretical model to study the calculated length coefficient of the modular column in the new node..Using the balance method to calculate the calculated length coefficient of the module column in the module without side shift and the module with side shift,it is found that the composite section flexural rigidity of the steel column will affect the calculation results.In order to study the influence of rectangular holes in the flanges of steel beams on the flexural bearing capacity of the beams,ABAQUS was used to simulate the flexural bearing capacity of beams with flange holes under different parameters,and the beam section at the opening was calculated based on the existing specifications.Maximum flexural capacity.A multi-scale model based on ABAQUS and a simplified model based on SAP2000 were established.By comparing the internal force and structural displacement of the members,the rationality of simplifying the new type of bolt node to rigid connection in the whole was verified again.Furthermore,according to the simplified model of joint rigid connection,the overall modeling of high-rise steel structure modular building is carried out.The static force,seismic response spectrum analysis and dynamic time history analysis of the model are used as supplementary calculations,and the obtained indicators are compared with the code limits,which proves The structure meets the requirements of "small earthquake resilience and no collapse in large earthquakes".