往复荷载作用下带洞口加强肋复合墙体的抗震性能

The seismic performance of reinforced rib composite wall with hole under cyclic lateral loading

为研究洞口对加强肋复合墙体抗震性能的影响,本文对二榀1/2比例的带洞口(带门洞、带窗洞)加强肋复合墙体进行水平低周往复荷载作用下伪静力试验,分析带洞口墙体典型部位钢筋应变的变化规律,研究带洞口墙体的破坏模式,探究带洞口墙体抗剪承载力、抗侧刚度、变形及延性等抗震性能。试验结果表明:带洞口墙体与不开洞墙体均有良好的抗倒塌能力和变形能力;带门洞墙体的肋梁先于外框柱发生屈服的剪切型破坏,带窗洞墙体发生外框柱先于肋梁发生屈服的弯剪型破坏;外框柱、肋梁对墙体的受力性能贡献较大,外框梁对墙体的受力性能贡献较小;带洞口墙体的延性优于不开洞墙体,但其抗侧刚度、抗剪承载力劣于不开洞墙体。

In order to study the effect of opening the hole on seismic performance of reinforced ribbed composite walls,this study was conducted on the pseudo static test under low cycle repeated load of two reinforced ribbed composite walls with holes(opening door hole and opening window hole)whose scales were 1∶2 entirely,the strain variation regularity of reinforcement in typical parts of the wall was analyzed,the failure modes was studied to comparing with the wall without hole,the seismic performance such as shear capacity,lateral stiffness,deformation and ductility was explored.The test results are indicated that the walls with and without hole have good anti-collapse ability and deformation capacity.Shear failure occurs in the wall with door hole,ribbed beam yields before the outer frame column.Bending shear failure occurs in the wall with window hole,the outer frame column yields before the ribbed beam.The contribution of outer frame columns and ribbed beams to the mechanical properties of the wall is lager,while that of outer frame beams is smaller.The ductility of the wall with hole is better than that of the wall without hole,but its lateral stiffness and extreme bearing capacity are inferior to those of the wall without hole.