HPFL加固有震损开洞短肢剪力墙抗震性能试验研究

Experimental research on seismic performance of HPFL strengthened short-pier shear wall with earthquake damage and openings

为了模拟实际工程中有震损且不能完全卸除竖向荷载,但需要加固的开洞短肢剪力墙,设计2个1:2缩尺比例的L形开洞短肢剪力墙试验试件,先在低周反复荷载作用下使其腹板上下端部纵筋达到屈服,在不卸轴力情况下,用综合性能优良的高性能水泥复合砂浆钢筋网(HPFL)对其进行加固,再对加固后的试验试件进行拟静力试验。利用ANSYS有限元软件对加固前后模型进行了数值模拟分析。通过与未加固的试验模型及数值模拟模型的比较,研究加固后的短肢墙抗震性能的恢复或提高情况,探索开洞率对加固效果的影响,并对加固层工作机理进行分析。结果表明,HPFL加固使短肢剪力墙的抗震性能有明显提升,加固后的试件随开洞率的增大,承载力下降,但延性提高,耗能能力增强。基于开洞短肢剪力墙的构造特点及破坏形态,总结出了有具体针对性的加固修复构造措施。

In order to simulate the short-pier shear wails with openings that are damaged by earthquakes with unremoved vertical loads needing reinforcement in practical engineering,two 1:2 scale L-shaped short-pier shear walls were designed. First,the longitudinal bars of the upper and lower ends of the web were yielded under low cyclic repeated loads.Under the condition of not unloading the axial force,high performance composite cement mortar laminates reinforced by mesh reinforcements(HPFL)with excellent comprehensive performance was used to reinforce it,and then quasi-static test was carried out on the strengthened test specimens.The finite element software ANSYS was used to simulate and analyze the model before and after reinforcement.By comparing with the experimental model and numerical simulation model without reinforcement,the recovery or improvement of seismic performance of reinforced short-pier shear wall was studied,arid the influence of opening rate on reinforcement effect was studied,and the working mechanism of reinforcement layer was analyzed.The results show that HPFL reinforcement improves the seismic performance of short-pier shear walls significantly.The bearing capacity of the strengthened specimens decreases with the increase of the opening rate,but the ductility increases and the energy dissipation capacity increases.Based on the structural characteristics and failure modes of the short-pier shear wall with openings,the specific reinforcement and repair measures were summarized.