多层钢筋混凝土框架结构减震方案对比分析

Comparative analysis of seismic mitigation schemes for multistory reinforced concrete frame structures

某3层幼儿园建筑,采用钢筋混凝土框架结构,抗震设防烈度为8度(0.30 g),抗震设防类别为重点设防类,为了满足建筑净高和使用要求,减小框架柱截面,拟在结构中设置消能减震构件,故对比分析了分别在结构中设置防屈曲支撑(BRB)、金属剪切阻尼器(SD)、黏滞阻尼墙(VDW)的模型。通过无控模型、BRB模型、SD模型以及VDW模型在多遇地震下的弹性时程分析,对比了周期、层间位移、层剪力以及减震率;通过罕遇地震下的弹塑性时程分析,比较了层间位移、层剪力以及消能减震构件的耗能。经过分析比较,给出了BRB、SD、VDW在多遇地震、罕遇地震下的作用特点,为后续类似项目的消能构件的选型提供参考。

A three story kindergarten building adopts a reinforced concrete frame structure,with the seismic fortification intensity of 8 degrees(0.30 g),and the seismic fortification category is the key fortification category.In order to meet the clear height and use requirements of the building,and reduce the frame column section,it is planned to set energy dissipation components in the structure.Therefore,the models of setting anti buckling braces(BRB),metal shear dampers(SD)and viscous damping walls(VDW)in the structure are compared and analyzed.Through the elastic time history analysis of uncontrolled model,BRB model,SD model and VDW model under frequent earthquakes,the period,story displacement,story shear force and damping ratio are compared;Based on the elasto-plastic time history analysis under rare earthquake,the story displacement,story shear and energy dissipation of energy dissipation components are compared.Through analysis and comparison,the action characteristics of BRB,SD and VDW under frequent and rare earthquakes are given,which provides a reference for the selection of energy dissipation components in subsequent similar projects.