| In recent years,under the background of the transformat ion and upgrading of the manufacturing industry,the country has vigorously promoted prefabricated buildings.The modular steel structure building is a pref abricated and highly assembled structural form,which has the advantages of high assembly rate,fast construction speed and labor saving.The promotion of modular structure is closely related to its seismic performance.Adopting energy-consuming shock absorption measures in a modular structure can effectively improve the seismic performance of the structure.This paper presents a steel module column-column and beam-beam combination energy-absorbing vibration-damping frame structure system,which uses energy-absorbing vibration-damping technology to improve the seismic performance of the modular building.The following research contents have been completed:The structural design and stress analysis of the outer steel plate column-column combination were carried out.A refined finite element model of the outer steel plate column-column combination based on Abaqus software was established.The unidirectional displacement and cyclic loading simulation were performed.The post-steel column-pillar combination improves the horizontal lateral resistance and seismic performance.The size parameters of the outer steel plate that affect the mechanical properties of the composite column were unified as the stiffness of the outer steel plate line.Considering th e bearing and energy consumption,a suitable outer steel plate size was obtained.A composite column with an outer steel plate opening was proposed to improve the mechanical properties of the composite column.It is verified that the outer steel plate can be simplified as a beam element simulation and the outer hole steel plate can be simulated by a connection unit.Aiming at the beam-beam combination in the modular steel structure,a pad-bolt connection beam-beam combination suitable for the modular steel structure is proposed,which improves the rigidity,bearing capacity and structural integrity of the beam.The composite beam is equivalent to a solid web beam of equal section,the shear force between the upper and lower module beams is derived,and the design formula of the shear connection is obtained.The refined elastoplastic numerical analysis of t he proposed modular beam-column connection node and its simplified model reveals its good basic mechanical properties and seismic performance.It is verifie d that the simplified model can be used to establish the overall structural model in the overall str uctural analysis.The modular system design of the 20-story steel structure dwelling was adopted to obtain a reasonable module component size.After reasona ble simplification of beam-column joints,Midas / Gens was used for overall modeling calculations,and the calculation results met the requirements of the code.Through the static elastoplastic analysis,the seismic performance of the modular structure after replacing the ordinary support with the equivalent stiffness anti-buckling support was compared.The outer steel plate column-column combination and the channel steel splicing beam-beam combination were applied to the overall structure to analyze the whole process of elasto-plastic seismic vibration reduction.Three seismic waves were selected according to the principle of seismic wave selection.The elastoplastic time history analysis and comparison under the action of earthquakes reveal that the proposed column-column and beam-beam connection and its modular assembled structural system have excellent seismic performance. |
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