高强砌块配筋砌体剪力墙抗剪性能试验研究

混凝土小型空心砌块是取代粘土砖的最有竞争力的墙体材料,在中高层房屋中具有广阔的应用前景。本文试验为砌块强度超过20MPa,剪跨比大于1.0的配筋砌块剪力墙抗剪试验。通过七片纵横配筋的高强砌块高悬臂剪力墙的低周反复荷载试验,考查了竖向荷载、剪跨比、水平配筋对该种剪力墙的影响。试验结果表明:砌块剪力墙的破坏形态与现浇钢筋混凝土剪力墙相似;配置的水平钢筋得到充分利用,因而试件的破坏形态完全体现了配筋砌体的特点,裂缝细而多,破坏时裂而不倒,明显改善了砌块剪力墙的抗震性能,该种墙体具有良好的强度、刚度、延性性能及能量耗散能力;试验得到的骨架三折线,为分析该种墙体的抗震时程分析提供了依据。

Experimental Research on Shear Performance of Reinforced Masonry Shear Walls of High Strength Concrete Blocks

Small-sized hollow concrete block,the most competent wall material for substituting brick than other wall materials,may be widely used to construct medium and high buildings in th e near future.The failure test of reinforced masonry shear wall with block strength above 20MPa and shear span over 1wa s conducted for the first time in Chin a.The experiment consisted of 7pieces of h igh strength cantilever shear walls reinforced respectively by longitu dinal and transverse steel bars under cyclic r eversed loading.The effects of vertical load,shear span ratio,transverse reinforce-ment on the lateral load-bearing cap acity were analyzed.Experimental r esults show that the failure mode of block shear wall is similar to those of cast-in-s ite concrete shear wall.The failure feature of reinforced masonry displ ays its charac-teristics for the function of transv erse steel bars.The fact that the num ber of cracks is more while the width o f the crack is small,and that the test specimen c racks rather than collapses during f ailure stage,all of which contribut ing to the improvement of aseismic performance,including strength,rigidity and energy dissipation capacity.In addition,the adaptability of the shear strength f ormulae of oblique section in the rev ised code for design of masonry structures(submitted for approval)are verified,and the tri-linear skeleton curve obtained from experimen t can serve as a base for time-history analysis of this type o f shear wall.