| The all-bolt-mounted light steel structure is a structural form that implements the concept of green building.The structural components are uniformly produced in the factory,realizing the characteristics of standardization,serialization and industrialization,and meeting the requirements of residential industrialization.The layered assembled light steel frame has good bearing performance and is suitable for rapid assembly on site.However,most areas in China are in high-intensity seismic fortification area,and research on seismic performance of all-bolt layered assembled light steel structure is carried out to promote the structure.The engineering process of the system is of great benefit.In this paper,the seismic performance of the full-bolt light steel frame is studied.The four-bolt full-bolt light steel frame is designed to perform the pseudo-static test.The SAP2000 software is used to study the simplification of the full-bolt light steel frame.The model is calculated to obtain the correct simplified calculation model of the full bolt-mounted light steel frame.The Pushover analysis method is used to analyze the elastoplasticity of the multiple and rare earthquakes,and the response under earthquake action is obtained.The main research contents are as follows:(1)Analyzed the advantages of fabricated light steel structure,the application and research status of fabricated light steel structure at home and abroad,several light steel structural forms and characteristics common in various countries,and introduced the system structure of layered assembled light steel structure.And stress characteristics.All the beam-column structures of the full bolt-mounted light steel structure are bolted,which not only improves the energy consumption of the structure,but also improves the industrialization degree of the structure and greatly accelerates the construction speed.(2)The 4 T full bolt-mounted light steel frame test piece was designed.Considering the two variables of axial compression ratio and support,the quasi-static reciprocating test was carried out to investigate the seismic performance of the full bolt-mounted light steel frame.Through the analysis of test phenomena and test data,it is concluded that the full bolt-mounted light steel frame has good bearing capacity,stiffness,ductility and energy consumption.When the axial pressure is relatively low,the increase of the axial compression ratio will increase the bearing capacity,rigidity and energy consumption of the frame.The support is provided in the full bolt-mounted light steel frame,which can greatly increase the bearing capacity and rigidity of the frame,but the frame degradation speed is accelerated after the support is set.(3)Analyze the connection properties of the full bolt joints.Two simplified calculation models with support and unsupported support when the axial compression ratio is 0.3 are studied.Pushover analysis is carried out to obtain the model under the action of multiple encounters and rare The connection properties of the full bolt joints are analyzed.The two frameworks with support or not when the axial compression ratio is 0.3 are used as the research object.The Pushover analysis is carried out and compared with the test results to obtain the model under the action of multiple encounters and rare earthquakes.Seismic performance of bottom shear,vertex displacement,performance points and plastic hinge distribution.The conclusion is that the full bolt-mounted light steel frame meets the requirements of the specification and has sufficient seismic resistance.The Pushover analysis of the full-bolt light steel frame supported by different forms is used to obtain the influence of different forms of support on the seismic performance of the frame.The analysis shows that the X-shaped support can greatly improve the bearing capacity of the frame,but the deformation capacity also decreases.The eccentric support frame has the weakest bearing capacity,but the eccentric support frame has the strongest deformation ability.After analysis,it is shown that when selecting the frame support form,it is necessary to comprehensively consider the influence of support on the bearing capacity and deformation capacity of the frame,and it is not possible to pursue high bearing capacity blindly. |
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