| Reinforced masonry shear wall is a new kind of prefabricated concretestructure system which is the assembly of horizontal reinforcement andlongitudinal reinforcement in the grouted concrete. With the influence ofpromoting urbanization and making ecological progress in China, reinforcedmasonry shear wall structure has been widely used in multistory and high-risebuildings containing the advantages of the merits of security, economy, beautyand energy saving. RCRM(Center of reinforced concrete and reinforced masonrystructures in HIT) does a lot of work to form a unique reinforced masonry shearwall structure system instead of the traditional reinforced masonry structures.With the successful completion of100-meter reinforced masonrybuilding-Kesheng, it marks that we have made a breakthrough in high-risereinforced masonry technology. This dissertation carried out the experimentalstudy on the shear performance of290mm thick reinforced masonry shear wallstested with constant vertical load and horizontal cyclic load, provided anexperimental basis for designing and building this type of structure.An experiment of six reinforced concrete masonry shear walls of290mmthick subjected to in-plane cyclic loading was carried out. The axial compressionstress and aspect ratio was changed to analyze the shear performance influencedby the factors. The cracks of different walls during the process of test weredescripted. The characteristic values of horizontal load and displacement wereobtained. The mechanical performance of horizontal and longitudinalreinforcement at each working stage of tested walls was analyzed.Force-displacement histories diagrams, skeleton curve, restoring model andstiffness degradation curve were obtained. Deformation and energy dissipationcapacity was compared with190mm and240mm thick reinforced masonry walls.The study showed that the shear strength was enhanced with the decrease ofaspect ratio and the increase of axial compression stress. In the shear failuremode, the configuration of horizontal and longitudinal reinforcement canimprove the ductility of the wall.It is shown that the shear capacity calculation formula in Code for design ofmasonry structures(GB50003-2010) is apparently over conservative for the290mm thick reinforced masonry shear walls based on the experimental result inthis dissertation. Based on the experimental data and the phenomena, this dissertation selected the upper separate which is under maximum shear loads toestablish equilibrium equation and proposed the ultimate shear load formula. Thefactors in this formula were fitted by the experimental ultimate loads of26sheardominated reinforced masonry shear walls. The influence on the factorsinfluencing the in-plane cyclic behavior of reinforced masonry shear walls, suchas the precompression, aspect ratio, the strength of grouted masonry, werediscussed. The longitudinal reinforcement’s contribution to the shear strength ofreinforced masonry shear walls under different aspect ratio was analyzed. |
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