Design Method And Time History Analysis Of Assembled Steel-concrete Composite Lattice Column System

With the advantages of convenience in construction and flexibility in structural configuration,multistorey prefabricated residential buildings were wildly used in our country.Steel structure,as its standardization in design,factory production,assemblage and mechanization in construction,was considered as a natural prefabricated residential building.However,the research of prefabricated steel residential buildings started late in our country,and the design and construction methods and relevant codes needed improve.Moreover,the currently used prefabricated beams and columns were exposure,and the room layout was inconvenient for residents.In order to solve those problem,a new fabricated steel-concrete composite lattice column(SCLC)system was proposed in this work.In this system,square steel tubes were connected by batten plate and filled with concrete,forming assembled composite lattice columns.Great progress has been made by researchers around the world in prefabricated steel structure and steel lattice column system.However,the research on prefabricated steel-concrete composite lattice column was still in deficiency.The bearing capacity,failure mode and seismic performance of SCLC were unknown.Therefore,the research on SCLC and the structures with SCLC was of great significance.In order to study the bearing capacity and failure mode of SCLC,6 models of SCLC were established using ABAQUS FEM software.Those models based on a steel-concrete residential building in Jinan,and were divided into 2 groups by its infill material and section shape.Those models were put into monotonic horizontal loading simulation.The result indicated that the batten-plate-concrete SCLC had the best bearing capacity,which was 31.78%% higher than that of batten plate SCLC.With concrete infilled into square steel tubes,the rigidity of batten-plate-concrete SCLC was improved significantly,while its ductility was reduced.The X-section SCLC had the best bearing capacity,which was 47.02% and 37.39% higher than that of Lsection and T-section SCLC respectively,while its ductility was the smallest and the deformation ability was poor.4 equivalent SCLC system structure models were established using SAP2000 FEM software based on the simulation results above.They were steel frame shear wall structure model(SS0),reinforced concrete structure model(SR0),batten plate SCLC shear wall model(S1)and batten-plate-concrete SCLC shear wall model(S2).The modal analysis,response spectrum analysis and time history analysis were put into those models.The result indicated that:2 SCLC models had shorter natural vibration period and larger structural rigidity than SS0,its floor displacements and displacement angles were reduced.The floor displacements and displacement angles of S2 were close to that of SR0.The building top displacement of SCLC models were decreased,and those building top acceleration,base shear force and the bending moment were increased.The above conclusions indicate that the SCLC could dissipate the seismic energy and increased the rigidity of the structure.The rigidity of the batten-plate-concrete SCLC structural was close to the reinforced concrete structure with the same cross-sectional area,while its ductility and deformability were better.And it has a good absorption and absorption effect on seismic waves,which improves the seismic behaviour of the structure.