| The steel structure has light weight,good ductility,and has a good energy dissipation mechanism for the eccentric support structure,and the seismic performance is particularly good.China’s current plan also proposes to promote the application of steel structures in areas where earthquakes occur frequently.The trend of the times.Earthquakes are frequent in China and most of them are in mountainous areas.Therefore,the seismic performance of typical falling structures in mountain buildings needs attention.So far,studies on the seismic collapse resistance and safety reserves of the collapsed frame structure have been relatively mature,but the existing research lacks the combination of the steel structure and the collapsed structure.Therefore,it is necessary to quantitatively analyze the steel frame structure with falling layers.In this paper,the advantages of the steel frame structure with falling layers are found by comparing with the ordinary concrete frame structure with falling layers.Provide a basis for in-depth seismic research on the falling structure.Based on the incremental dynamic analysis method,this paper designs 7 frame models according to the relevant design specifications,including 2 ordinary flat steel frame structures,2 dropped flat steel frame structures,2 flat dropped steel frame structures reinforced with tension beams,An ordinary reinforced concrete falling frame structure was verified and the Perform-3D software was used to perform seismic simulation on the structure.The change rule of the model under the action of earthquake was analyzed.The quantitative comparison and analysis of the falling frame structure of different materials and structural measures The ability to resist earthquake collapse and the safety reserve against earthquake collapse.The main research results of this article are as follows:(1)In terms of the comparison between the dropped steel frame structure and the ordinary steel frame structure,when the number of floors is the same,the seismic performance is not much different,but the latter’s seismic safety reserve is slightly higher than the former.In addition,the number of delaminated layers has little effect on the overall seismic performance of the structure,but it has a certain effect on the seismic performance of the delaminated side,and as the number of delaminated layers increases,the seismic performance is improved.(2)The falling steel frame structure and the ordinary reinforced concrete falling frame structure have similar collapse resistance,but because the ductility and tensile capacity of the steel structure are better than the reinforced concrete structure,the overall collapse resistance of the falling steel frame structure should be Significantly superior to ordinary reinforced concrete falling structure.For the upper grounding side,the upper grounding layer is the relatively weakest floor,while for the falling side,the upper grounding second layer on the falling side is the weakest floor,and it is most likely to reach the collapse ultimate failure state.(3)The measure that the tension beam is placed on the falling side of the falling steel frame structure can enhance the overall seismic performance of the structure,and obviously enhance the upper grounding side,but it has the opposite effect on the falling side.The enhancement effect has nothing to do with the number of tension beams.The presence of the tension beam can make the seismic collapse resistance of the falling side and the upper grounding side more uniform,and it is close to the seismic performance of the ordinary steel frame structure.Therefore,in practical engineering applications,it can be considered to increase the anti-seismic collapse capacity of the steel frame structure with a drop by adding tension beams. |
