Elastic-Plastic Seismic Response Analysis Of Reinforced Concrete Skip-Floor Shear Wall Structure

Skip-floor shear wall structure system is a new type of structure system, in which, a series of reinforced concrete shear wall is scattered in every other floor and every other span along the height of frame. This type of structure system can provide bigger space for the building, and the lateral drift is relatively smaller compared with the pure frame structure. Therefore, it is of great practical significance to do research on the skip-floor shear wall structure.At first, 11~16F inner-corridor skip-floor shear wall structure in the region of seismic fortification intensity of degree 7 and 8 are made as the research object, the data model of the whole structure is set up by PMCAD, and the inner force and deformation of the skip-floor shear wall structure subjected to frequently occurred earthquake are analyzed by using the mode superposition response spectrum method based on the SATWE structure analysis software. This software can adjust seismic reinforced measures according to different requirements and give the reinforcement automatically. 1/800 is adopted as the allowable elastic interstory drift angle after referring to the regulation about the reinforced concrete frame-shear wall structure in《Code for seismic design of buildings》(GB50011-2001). The results indicate: by choosing the proper section dimension, the maximum elastic interstory drift angles along"y"direction (transverse direction) of the skip-floor shearing wall structure subjected to frequently occurred earthquake are all smaller than 1/800. It means that the first seismic fortification aim"no damage in small earthquake"is reached.Then, based on the EPDA structure analysis software, three actual violent earthquake waves and one artificial wave are selected and the elastic-plastic time-history analysis is carried out. 1/100 is adopted as the allowable elastic-plastic interstory drift angle at each floor after referring to the regulation about the reinforced concrete frame-shear wall structure in《Code for seismic design of buildings》(GB50011-2001). For 11~16 F skip-floor shear wall structure in the region of seismic fortification intensity of degree 7, the corresponding calculation and details of seismic design of the beam and column should comply with the frame structure of the 3rd earthquake-resistant grade, and for shear wall, the corresponding calculation and details of seismic design should comply with the shear wall structure of the 2nd earthquake-resistant grade; For 11~16 F skip-floor shear wall structure in the region of seismic fortification intensity of degree 8, the corresponding calculation and details of seismic design of the beam and column should comply with the frame structure of the 2nd earthquake-resistant grade, and for shear wall, they should comply with the shear wall structure of the 1st earthquake-resistant grade. The results indicate: the maximum elastic-plastic interstory drift angles in"y"direction (transverse direction) of the skip-floor shear wall structure subjected to rare occurred earthquake are all smaller than 1/100, the third seismic fortification aim"no collapse under strong earthquake"is reached.At last, for inner-corridor skip-floor shear wall structure, some design proposals on application scope, material and section selection, earthquake-resistant grade division, details requirements and design process are put forward.