Study On Seismic Performance Of Straw-steel Assembled Composite Wall Structure System

Straw burning will not only cause serious air pollution but also cause the spread of fire.In order to solve this problem,in recent years,the state has begun to increase efforts to introduce relevant policies to promote the comprehensive utilization of crop straw.Earthquake disaster is one of the most serious natural disasters in China.The collapse of houses and personal injuries caused by earthquakes occur from time to time,and they also cause great economic losses to the country.Research on green building structures with superior seismic performance has become a hot spot.Straw-steel assembled composite wallboard structure system(straw-steel structure in this paper)skillfully applies crop straw to the field of assembled buildings,which provides a new idea for the development of low-carbon and environmentally friendly green buildings.In this paper,the seismic performance analysis of straw-steel structure will be carried out.Firstly,based on the preliminary study of straw-steel structure,the ABAQUS finite element models of two-layer and seven-layer straw-steel structure are established and the accuracy of modeling is demonstrated.Then,the straw-steel composite plate wall model is simulated by low-cycle reciprocating cyclic loading to investigate the ductility and energy dissipation capacity of the straw-steel composite plate wall.Finally,the static elastoplastic analysis and dynamic elastoplastic time history analysis of two-layer and seven-layer straw-steel structure are carried out to study the seismic performance of the structure.1.Research on finite element modeling method of straw-steel structureBased on the vertical static load test of the existing two-layer structure scale model,the finite element model of straw-steel structure is established based on the finite element software ABAQUS,and the corresponding finite element simulation analysis is carried out.The test results and finite element simulation analysis results are compared to verify the effectiveness of ABAQUS modeling.Analysis of ductility and energy dissipation of straw-steel composite wallboard2.Static elastic-plastic analysis of the straw-steel structureBased on the finite element software ABAQUS,the numerical model of the strawsteel composite wall was subjected to low-cycle reciprocating cyclic loading,and the hysteresis curve of the straw-steel composite wall was obtained.The ductility,energy dissipation capacity and seismic capacity of the straw-steel composite wall were analyzed.3.Dynamic elastic-plastic time history analysis of straw-steel structureThe ABAQUS finite element model of the straw-steel assembled composite panel wall structure was subjected to static elastoplastic analysis(Pushover analysis)using two methods of uniform distribution and inverted triangle distribution.The shear-top displacement curve of the straw-steel structure was obtained,and the performance point of the structure was found according to the capacity spectrum curve.Verify the seismic performance of the structure and determine whether the structure meets the seismic fortification requirements.4.Dynamic elastic-plastic time history analysis of the straw-steel structureBased on the finite element software ABAQUS,the modal analysis of the strawsteel structure was carried out.The damping coefficient was calculated based on the first two natural vibration periods of the structure.Then,the seismic waves required for the time-history analysis were determined according to the specifications.The straw-steel structure model was subjected to 7,8 and 9 degrees of frequent earthquakes and rare earthquakes.The response parameters such as acceleration,displacement and inter-story displacement angle of the structure were obtained,and the seismic performance of the straw-steel structure was further investigated.