小高层密肋壁板结构复合墙体抗弯性能试验研究

Study on flexural behavior of multi-ribbed composite wall in moderate-high storied multi-ribbed slab structure

通过两榀1/2比例两层两跨密肋复合墙体模型在竖向荷载、水平荷载及附加弯矩共同作用下的单调加载试验,模拟12层小高层结构中底层墙体的受力性能,着重从墙体的破坏过程、破坏模式、承载力、变形性能、钢筋应变分布以及抗弯刚度退化等方面进行较深入地研究分析.结果表明,底层墙体在压、弯、剪复合受力状态下,其破坏模式主要为弯曲型破坏,其延性及变形性能不及剪切型破坏墙体.为保证墙体具有较好的延性及变形能力,在设计中应确保边框柱与复合墙板之间的合理匹配.

In order to simulate the mechanical behavior of buttom wall in a 12 storied moderate-high storied multi-ribbed slab structure, two 1/2-scaled model monotone experiments of the walls with two spans and two stories under vertical load, horizon load and bending moment are presented. Based on the test data, the wall＇s failure process, failure mode, bearing capacity, deformation performance, the strain distributions of steel bars and flexural stiffness degeneration are analyzed. The results show that failure mode of the wall in complicated stress condition is flexural failure and both the ductility and the deformation performance of the wall are not as good as walls with shear failure mode. Hence, rational capacity matching between the end frame columns and multi-ribbed composite slabs should be guaranteed in actual work of engineering design.