| Shear Walls are of complex mechanical environment for vertical and horizontal loads.In high-rise buildings or skyscrapers,stereotype reinforced concrete shear walls had to be complicated in design and construction because of rigorous loading conditions.Steel plate concrete composite wall has been popularized as a kind of new style component in skyscrapers.Corrugated steel plate has been used in the research of sheet-concrete shear wall and has shown its ideal engineering application potential.Additionally,the design method of the special-shaped section shear wall in the current design code is still lacking,which hardly provide reference for real engineering.In response to this situation,the corrugated steel plates were used as the outer plates to create L-shaped double corrugated steel plate concrete composite shear wall(DCSPCCSW)in this paper,and the further seismic performance of this kind of wall was studied to provide references for the design of corrugated steel composite shear wall with special-shaped section.These researches were included:(1)10 pieces of L-shaped DCSPCCSW in differences of axial compression ratio,shear span ratio,corrugation shape,corrugation direction,constraint form,flange width were in horizontal cyclic loading tests.The failure process,failure modes and the hysteresis curves were acquired.The hysteresis curves appeared as S-shaped or bow-shaped and asymmetric because of larger residual deformation in forward direction.The failure phenomenon is concentrated on the bottom of the outer edge of the web wall,which can be described as bending failure.(2)Seismic performance indicators of L-shaped DCSPCCSWs,such as skeleton curves,characteristic points,ductility,stiffness attenuation,strength attenuation,energy dissipation capacity were obtained,and their relation with specimen parameters were analyzed.The ductility coefficients of were generally above 3,which indicated their good ductility.Their ultimate inter storey displacement were generally more than 1/50,which showed their ideal collapse resistance.L-shaped DCSPCCSWs were of well bearing capacity,lateral stiffness and energy dissipation capacity.The lateral stiffness of L-shaped DCSPCCSW s can be increased by increasing the axial compression ratio,reducing the shear span ratio,arranging the corrugation vertically and setting square steel tube columns at the end of wall limbs.The strength of the specimen with horizontal corrugation decays quickly.Increasing axial compression ratio,setting the narrow corrugation,arranging the horizontal corrugation and no square steel tube columns at the end of wall limbs can make the equivalent viscous damping coefficient of the specimen higher and the energy dissipation capacity of the single cycle better.(3)Analyzing the failure process,failure modes and the strain laws of the crucial parts,L-shaped DCSPCCSW s’ stress mechanism in bending failure were acquired.Calculating formulas of normal section bending capacity were built in different loading directions.Comparing the calculated results with measured data,the calculation method is reliable.(4)By fitting the measured data,a kind of three-line skeleton curve model of L-shaped DCSPCCSW was established.How to calculate the coordinates of key points and the slope of each line segment in the skeleton curve model were given.Regression was used in L-shaped DCSPCCSW s stiffness degradation analysis and obtain relation between unloading stiffness and loading displacement.(5)L-shaped DCSPCCSWs showed better bearing capacity and ultimate deformation capacity over the kind of reinforced concrete.According to other rescarches of special-shaped composite shear walls,there were some suggestion for engineering:corrugated steel plate should be arranged vertically;constraint members with high stiffness should be set at the end of the wall,the anchoring area of the drawing screws should be enlarge.The achievements enrich the theoretical content of DCSPCCSW,and provide reference and basis for these structure in engineering application. |
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