| Double corrugated steel concrete composite shear wall is a new kind of composite shear wall structure,the double corrugated steel plate,steel tube column edge constraint by bolt,stud connection and inner filling concrete,as the main component of lateral and vertical bearing capacity,form a kind of with one word,L shape,T shape and so on major tectonic forms of double corrugated steel concrete composite shear wall,it has excellent mechanical properties,excellent seismic performance and good lateral resistance and convenient assembly performance and the advantages of good application prospect,the future can be widely used in high-rise steel structure,prefabricated steel structure residential and industrial buildings,and other fields.Double corrugated steel concrete composite shear wall,the author of this paper,the seismic performance of this new type of resistance to lateral force system was studied,with the axial compression ratio,shear span ratio,the types of corrugated,corrugated direction,the stud spacing and corrosive screw parameters for change,a total of 35 design 1:3 proportion of double corrugated steel concrete composite shear wall specimen,low reversed cyclic loading tests are carried out.Among them,there are 13 specimens of one-shaped double-corrugated steel plate concrete composite shear wall and 2 flat steel plate control specimens,10 L-shaped double-corrugated steel plate concrete composite shear wall specimens and 10 T-shaped double-corrugated steel plate concrete composite shear wall specimens.The failure process,failure mode and failure mode of double corrugated steel composite shear wall under low cyclic load are studied,and the similarities and differences among them are compared.At the same time,the influence of the variation parameters on the seismic performance indexes of the composite shear wall with double corrugated steel plate,such as hysteretic characteristics,bearing capacity,displacement ductility,strength degradation,stiffness degradation and energy dissipation capacity,was studied.The results show that :(1)The failure modes of the composite shear wall with double corrugated steel plate and concrete mainly include buckling failure,bending failure and constraint failure failure.The failure modes of I-shape specimens are mainly affected by axial compression ratio,steel plate type,connecting member and shear span ratio.The failure modes of L and T-shape specimens are mainly affected by corrugated steel plate type,axial compression ratio,constraint steel tube column arrangement and shear span ratio.(2)With the increase of axial compression ratio,the hysteresis curve of the specimen became fuller,the ultimate bearing capacity was higher,the initial lateral stiffness was improved and the energy dissipation capacity was enhanced,but at the same time the strength degradation was accelerated and the ductility was reduced.(3)With the increase of the shear span ratio,the hysteresis curve of the specimens became fuller,the strength degradation rate slowed down,the ductility increased slightly,but the ultimate bearing capacity and stiffness decreased,and the equivalent viscous damping coefficient after the peak was higher,while the cumulative energy consumption showed an opposite trend.When the shear span ratio of L and T-shaped wall increases,the hysteresis curves of the specimens become fuller,but the ultimate bearing capacity,lateral stiffness and initial loop stiffness all decrease,while the indexes such as strength degradation,ductility and energy consumption are relatively less affected.(4)Compared with the flat steel specimen,the hysteresis curve of the corrugated steel specimen is fuller and decreases slowly,the ductility and energy consumption are better,and the ultimate bearing capacity of the corrugated steel specimen increases obviously when the shear span ratio is small,but the stiffness degradation has little difference.The corrugation size has little effect on the seismic performance index of the specimen,while the corrugation direction has more effect.Compared with the transverse corrugated specimen,the vertical corrugated specimen has better ultimate bearing capacity,lateral stiffness,ductility and energy consumption,and the strength degradation is slower.The change of ripple size mainly affects the deformation capacity and energy consumption of the specimen.Compared with the narrow ripple specimen,the wide ripple specimen has better ductility,but the energy consumption capacity is reduced.(5)The initial stiffness of the specimen of the connectionless member is larger,and its stiffness degradation rate is the fastest in the process of failure under stress.The order of improvement ability of stiffness performance of different types of connection members from strong to weak is: stud + pair drawing screw,pair drawing screw and stud.On the whole,the equivalent viscous damping coefficient of the specimens without connection members is larger than that of the specimens with connection members,and the equivalent viscous damping coefficient of the specimens with drawing screws is smaller than that with studs.Under the same shear span ratio,the total energy dissipation capacity of the specimens with no connection members is greater than that with connection members,and the total energy dissipation capacity of the specimens with studs is stronger than that of the specimens with drawing screws.(6)The bearing capacity,ductility and energy consumption of the specimen can be improved by setting the constraint square string,and the degradation degree of strength and stiffness can be significantly reduced.With the increase of flange width,the bearing capacity of the specimen is increased,and the lifting effect of the small shear span is more effective than that of the test piece.In addition,the strength degradation of the specimen and the stiffness degradation of the compressed flange are slowed down,while the ductility is not affected much.(7)Based on the finite element software ABAQUS,shear wall models of three types of sections were established respectively,and the mechanical behavior of the shear wall under horizontal low cyclic load was simulated and calculated.The calculated results were in good agreement with the simulated results,indicating the feasibility of ABAQUS numerical simulation.At the same time,a model was established to expand the influence rules of four parameters on the seismic performance of shear walls,such as axial compression ratio,wall height and thickness ratio,shear span ratio and section steel content ratio(steel content ratio of steel pipe and steel plate),so as to further reveal the seismic performance of the new system under horizontal repeated loads.(8)Based on the assumption of the plasticity of the whole section,the formula for calculating the flexural capacity of the normal section of the composite shear wall with double corrugated steel plate is derived,and the calculated results are in good agreement with the experimental results.At the same time,the value range of the key design parameters is defined,and the design suggestions of the key configuration parameters and the related structural requirements are given,which provides the relevant basis and reference for the subsequent standard specification compilation and engineering design. |
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