Research On Seismic Behavior Of BRB-Prefabricated High-Rise Steel Frame Residential Structure

The anti-lateral performance of the structure is the key to study the seismic behavior of the prefabricated high-rise steel residential structure.In the double seismic fortification structure system of BRB and steel frame,they together provide lateral stiffness for the whole structure.How to ensure that the BRB as the first seismic line to assume the lateral seismic forces under the effect of small earthquakes,the first energy damage under strong earthquakes,so as to guarantee the safety of the structure is the focus of the study of structural seismic performance.Therefore,the energy dissipation capacity ratio of BRB and frame structure of the whole structure is very important under severe earthquake.The seismic performance of the BRB-steel frame residential structure is studied,and combined with engineering examples,the 28-storey prefabricated high-rise steel frame residential structure is analyzed.Finite element software Midas Gen was used to compare the inter-storey displacement angle of the whole structure and the hysteresis loop curve of BRB,and the two methods were combined to design stiffness of BRB.The results show that with the increase of lateral stiffness ratio,the inter-layer displacement angle of the structure decreases in the third and fourth sections.With the increase of shear strength ratio,the inter-layer displacement angle of the structure decreases effectively in the first and second sections.Compared with the BRB hysteretic curves obtained by the two methods under the condition of similar overall stiffness,the shear force method has better hysteretic energy dissipation.By mixing the two methods,the inter-layer displacement angle of the structure is obviously reduced,which reduces the amount of steel while ensuring the safety and applicability of the structure,and gives full play to the advantages of green and energy-saving of the steel structure.