带门洞加强肋复合墙体抗震性能及抗侧刚度影响因素研究

制作了1榀开门洞1/2比例的加强肋复合墙体模型,进行伪静力抗震试验,对墙体中钢筋应变进行分析,研究墙体各部件的受力性能,探究在低周反复荷载作用下带门洞加强肋复合墙体的破坏模式、承载力、滞回及耗能能力、延性、刚度退化等抗震性能,并与标准不开洞墙体的抗震性能进行对比。在试验研究的基础上,建立不同门洞参数的有限元数值模型,探究门洞位置、肋柱截面及肋柱配筋率的改变对加强肋复合墙体抗侧刚度的影响。结果表明:带门洞加强肋复合墙体按照砌块-肋梁-外框的顺序依次破坏,破坏模式以剪切型破坏为主;相比无洞口加强肋复合墙体,带门洞墙体抗侧刚度等抗震性能明显较差;相同门洞尺寸情况下,门洞居中时加强肋复合墙体抗侧刚度相对较大;洞边加强肋柱对开门洞墙体的抗侧刚度提升显著,但其提升作用随着门洞肋柱截面的增大而逐渐减弱;增大加强肋柱配筋率对墙体抗侧刚度提高不明显。

The study on seismic performance and influence factors of lateral stiffness of reinforced rib composite wall with a door

For the purpose of studying the mechanical properties of each component in reinforced rib composite wall with door hole,the failure mode,bearing capacity,hysteretic behavior,energy dissipation capacity,ductility and stiffness degradation of the wall under low cyclic reversed cycling loads are explored,the seismic behaviors are compared with the standard wall without hole.A specimen with 1/2 ratio of reinforced rib composite wall with door hole is design for pseudo static test.Based on the experimental study,the finite element numerical models with different parameter of the holes are established to investigate the influence of the location of the holes,the section and the reinforcement ratio of the rib column on the lateral stiffness of the reinforced composite wall.The results shows that:the reinforced rib composite walls with door hole are destroyed sequentially according to the order of blocks-rib beam-outer frame,and the main failure mode is shear failure;compared with the standard wall,the lateral stiffness of the wall with door hole is obviously worse;the lateral stiffness of reinforced rib composite wall is larger when the door hole is in the middle under the same size of the hole relatively;added rib columns at the edge of the hole can significantly increase the lateral stiffness of the wall with openings,but its effect decreases with the increase of the cross section of rib columns;increased reinforcement ratio of rib column has no obvious effect on lateral stiffness of wall.