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

With the continuous increase of the building height and the rapid expansion of the architectual technology,the high-strength concrete is widely used in high-rise building and super high-rise building. As the main used lateral forces-resisting element of the high-rise building and super high-rise building,the quality of the lateral forces-resisting element decide whether the buildings’ safety. As the height of the high-rise building continues to be refreshed,Higher requirements were put forward of the seismic bearing capacity of the vertical component of the buildings. According to the experimental research,the structuals’ anti-sesmic property can be improved by setting resonable shaped steel bracings. Inspired by this, get Cold bend section steel and high strength concrete shear wall together,set Cold bending thin-wall channel in the high-strength concrete shear wall, and set cold bending thin-wall connecting angle in the web to improve the anti-sesmic property of the structuals.Our research team did some experiments last year to research the influences of the anti-sesmic property of different types of hidden bracings,the experiments includ 4 tall high-strength concrete shear wall which shear span ratio is 1.8 and the concrete strength grade is C60,the atio of axial compression stress to strength of the 4 test specimens is 0.24. The experimental result verified the different types of the hidden bracings can have big effects on the high-strength concrete shear wall’s anti-sesmic property. But in the designs of the high-rise buildings,many designers’ works are near to the specification limit,so in this thesis,the author improved the ratio of axial compression stress to strength in order to make the experiment closer to the real situation. This article composed by:The main research results are as follows:①Finish the experiment with 3 high-strength concrete tall shear wall test specimens which are include cold-formed thin-walled steel diagonal bracings and their ration axial compression are 0.52 and 0.60.②On the basis of the test consequence,with the cracking load,the ultimate displacement,the horizontal bearing capacity under different levels of the displacement and the experimental phenomena from the beginning to the end of the experiment,painting the hysteretic curve, skeleton curve and the teel strain of the test specimens,and then compare the anti-sesmic property of under this circumstance with the consequences which have finished by our research group to research the anti-sesmic property of the high-strength concrete tall shear wall which are include cold-formed thin-walled steel diagonal bracings and high ration axial compression.③Set up the mechanical model under the ultimate bearing capacity,compare the experiment value and the calculated value to get the computational fomula of the high-strength concrete tall shear wall which are include cold-formed thin-walled steel diagonal bracings.