高烈度区低配筋多层剪力墙结构的抗震性能分析

Seismic performance analysis of low reinforcement concrete shear wall structure in high-intensity regions

为了研究高烈度区多层剪力墙结构采用比现行规范规定偏低构造配筋的抗震性能和工程应用可能性,针对4个不同平面布置形式的多层剪力墙结构,分别按我国规范设防烈度8度区(0.20g、0.30g)和9度区进行抗震设计,并在规范规定的基础上减少墙身构造钢筋量,形成低配筋多层剪力墙结构。采用Perform-3D程序对12个低配筋多层剪力墙结构模型进行了非线性动力反应分析。结果表明,在罕遇地震作用下,各结构模型的地震反应较小,进入非线性的程度不深,结构的损伤偏小,且更多损伤集中在连梁梁端,而不是在剪力墙墙身。将墙身分布钢筋配筋率与文中低配筋剪力墙相近或比其更低的低配筋剪力墙试件的试验结果与非线性动力分析结果对比后发现,低配筋剪力墙试件的极限位移角远大于非线性动力反应分析中获得的具有84%保证率的结构最大层间位移角需求值,且试件在达到这一层间位移需求值时的损伤非常小。因此,高烈度设防区(8度和9度区)低配筋多层剪力墙结构的抗震性能良好,经合理设计后可在高烈度区应用。

To investigate the seismic performance and the possibility of engineering application of muhi-story shear wall structures with lower reinforcement in high-intensity regions, twelve multi-story shear wall structures with low reinforcement in intensity zone 8 （0.20g） , 8 （0.30g） and 9 respectively were designed compared to the specification of the current codes. According to the result of the nonlinear time history analysis by applied to them, under the input of rare strong motion records, the seismic responses of the structures are small with little nonlinearity. The damages of the structures are relatively slight and concentrated at the ends of the coupling beams instead of the shear walls. Compared among the experimental results of the shear walls with similar or lower reinforcement ratio of distributed steel bars and the results of the shear walls with low reinforcement, it is found that the ultimate story drift ratios of the low reinforcement shear wall specimens are much larger than the maximum interstory drift ratio demand with 84% guaranteed rate. The damage to the walls is very slight at the lateral displacement corresponding to the demanded drift ratio. Therefore multi-story shear wall structures with low reinforcement will behave well under strong earthquakes and can be applied in high intensity region （ intensity zone 8 and 9） as long as they have been designed well.