Experimental And Numerical Study On Seismic Performance Of Precast Fabricated Integration Shear Wall

This paper proposed an integration construction method for the infill wall of precast fabricated shear wall in order to reduce the lateral stiffness and weig ht of the long RC shear wall, and improve the degree of industrialization. Firstly, in the region to be infilled, lay two layers of rebar grid and a layer of hollow circular pipes in the middle. Then precast the infill wall together with the structural wal l, and the precast fabricated integration shear wall is formed. A series of experimental and numerical study about this kind of precast fabricated integration RC shear wall were conducted, major research contents are as follows:1. Five geometrically identical full size precast fabricated RC shear wall specimens were constructed and tested under quasi-static cyclic lateral loading. The only difference among the specimens was the construction method of infill wall, the methods were respectively integration infill, block masonry infill and without infill. Based on the quasi-static experiment results, characteristics like failure mode, stress features, bearing capacity, deformability, stiffness, ductility and energy-dissipating capacity were obtained and concluded. Experiment results shows that, compared to the wall infilled by masonry and without infill, integration shear wa ll owns better shear capacity, stronger stiffness, good ductility and well energy-dissipating capacity. All these characteristics assure the reliable seismic performance.2. Based on finite element software Open SEES, the use of multi-layer shell element and the correct material constitutive relationship, FE results of the tested 5 specimens were obtained and validated by conformable hysteretic curves, skeleton curves and the strain of longitudinal reinforcement.3. Based on the results of experiment and FE analysis, the effects of using larger pipes, setting polyurethane cystosepiment and weakening rebar grid were explored and reasonable construction method was proposed.4. Various parameters including width of infill wall, number of vertical gaps, strength of concrete, reinforcement quantity and axial compression ratio were analyzed by FE method, and the effects of these parameters on shear capacity were obtained.5. Based on the results of experiments and FE parameter analysis, calculation method of the shear capacity and the stiffness for the precast fabricated integration shear wall was proposed: for integration wall with thorough vertical gaps, the calculated result could be the combination of the respective result of wall leg and infill wall; for integration wall without gaps, the wall should be considered as an integral wall to calculate the shear capacity and stiffness, the section could be simplified as an I-shaped section.