【摘要】 为了研究高宽比对配筋砌块砌体剪力墙耗能能力的影响,确定墙体的耗能参数。利用6片高宽比H/h为1. 57、1. 14和0. 71的足尺全灌芯配筋砌块砌体剪力墙拟静力试验,通过计算墙体的耗散能(累积和单圈)、等效粘滞阻尼比ζeq、能量耗散系数ψ和功比指数Iw四个参数,来分析发生剪切型破坏模式墙体的耗能能力。研究结果表明:H/h对墙体的耗能能力影响较大,随着墙体变形的增大,H/h越小墙体的耗散能增长越迅速,墙体的延性越差;当H/h=1. 14时,能量耗散系数ψ较低,等效粘滞阻尼比ζeq较小,约为7%～10%,墙体的耗能能力较差;当H/h=0. 71时,ψ较高,ζeq较大,约为14%～15%,墙体的耗能能力较好;随着位移的增大,功比指数Iw逐渐增大,当位移较小时Iw几乎呈线性增长,当位移较大时Iw呈非线性增长,H/h=1. 14墙体的Iw增长相对缓慢。可见:对于发生剪切型破坏模式的配筋砌块砌体剪力墙,H/h接近1时耗能能力较差,在工程中尽量避免采用。更多还原

【Abstract】 The energy dissipation parameters are determined for studying the influence of the aspect ratio on the energy dissipation capacity of reinforced-block masonry shear walls. Six full-scale fully grouted sample models with the aspect ratio H/h of 1. 57,1. 14 and 0. 71 are tested subjected to the low cyclic reversed lateral loads. The energy dissipation capacity of the walls with the shear-dominated failure mode is analyzed through calculating four parameters including dissipated energy( accumulation and single circle),equivalent viscous damping ratio ζeq,energy dissipation coefficient ψ and power ratio index Iw. The results indicate that H/h has a great influence on the energy dissipation capacity of the wall. As the deformation of the wall increases,the smaller the H/h is,the faster the dissipated energy of the wall grows,and the worse the ductility of the wall becomes. When H/h = 1. 14,the energy dissipation coefficient ψ is low with a small equivalent viscous damping ratio ζeqof about 7%-10%,and the energy dissipation capacity of the wall is poor. When H/h = 0. 71,ψ is higher with a larger ζeqof about 14%-15%,and the energy dissipation capacity of the wall is better. As the displacement increases,the power ratio index Iwgradually increases. Iwshows a linear increasing trend when the displacement is small,however,Iwincreases nonlinearly when the displacement is relatively large. When H/h = 1. 14,Iwof the wall increases relatively slowly. It is concluded that the energy dissipation capacity of the reinforced-block masonry shear walls with the shear-dominated failure modeis poor when H/h is close to 1,which is not recommended for engineering applications.更多还原