Experimental Study On Seismic Behavior Of Cold-Formed Steel Reinforced High-strength Concrete Low Shear Wall With Concealed Bracings

With the application of high-strength concrete in modern buildings, its anti-seismic ability has received extensive attention. Experiments have confirmed that in high strength concrete shear wall, reasonable concealed bracings, such as hot rolled steel and cold rolled steel concealed bracings both can improve the anti-seismic ability. Due to the shear span ratio is less than 1 of low-rise shear walls of high-strength concrete anti-seismic ability is poor, it was usually shear failure in the earthquake, so this article intends to study the anti-seismic ability of low-rise shear walls of high-strength concrete with cold rolled steel concealed bracings.The author’s research team has completed four low-rise shear walls of C60 high strength concrete with cold rolled steel concealed bracings under cyclic loading test. The design of the axial compression ratio is 0.24, and the test of the axial compression ratio is 0.075. We study the anti-seismic ability of low-rise shear walls of high-strength concrete with different concealed bracings. Tests confirmed the different concealed bracings of high-strength concrete anti-seismic ability varying degrees of impact, but in high-rise building structure design, designers often control axial compression ratio close to the specification limit, such as 0.6, so this article is going to study the anti-seismic ability of low-rise shear walls of high-strength concrete with angle steel concealed bracings under high axial compression ratio.The main work and achievements are as follows: ① The author designs two low-rise shear walls of high-strength concrete with angle steel concealed bracings under axial compression ratio of 0.52 and 0.60 to study the anti-seismic ability in contrast to the previous test of shear wall under axial compression ratio of 0.24.② The author designs another shear wall with bigger angle steel concealed bracings under axial compression ratio of 0.52 to study the influence of concealed bracings on the anti-seismic ability and the aseismatic construction of low-rise shear walls of high-strength concrete under high axial compression ratio. ③ The cracking load, ultimate load, ultimate displacement, hysteretic curve and skeleton curve of the three component are obtained by low cyclic loading test and we conclude that the axial compression ratio has great influence on cracking load.④By comparing the four components of the displacement ductility, energy dissipation and strength attenuation performance, we found that the axial compression ratio is larger, component of the horizontal bearing capacity of a substantial increase, but component of energy and ductility decrease and increase the diagonal area can effectively improve the ductility and energy dissipation capacity of components so bigger angle steel concealed bracings improve the anti-seismic ability of low-rise shear walls of high-strength concrete. ⑤ The shear capacity in oblique sections in low-rise cold-rolled-steel-high-strength- concrete shear walls with concealed bracings was computed. Based on codes and comparison between computed values and test values, a computational formula for shear capacity in oblique sections in low-rise cold-rolled-steel-high-strength-concrete shear walls was proposed.