水平地震力作用下钢筋混凝土异形柱框架结构设计

Design of reinforced concrete structure with special-shaped columns under horizontal seismic loading

由于钢筋混凝土异形柱截面几何性质的特殊性,需考虑不同地震作用方向下结构的反应。结合工程实例,对钢筋混凝土异形柱框架结构在不同方向的水平地震作用下进行受力分析,对自振周期、轴压比、柱底层剪力和层间位移角进行分析。结果表明,L形异形柱方向性较强,应考虑45°和-45°地震作用方向的计算,同时应调整异形柱平面布置形式,使其刚度中心尽量与形心重合,以此减小扭转效应对结构的不利影响。

Due to the particularity of geometric property of reinforced concrete special-shaped cross-section, structural response in different horizontal seismic directions should be taken into account. According to an example, reinforced concrete structure with special-shaped columns was analyzed in different horizontal seismic directions. Natural period of vibration, axial compressive ratio, bottom shear of column and drift angle were also researched. The result demonstrates the special-shaped column of L section has stronger direction. The directions of 45 degree and 45 negative degree should be taken into account. Plane placement of special-shaped columns should be adjusted that its center of rigidity can be close to centroid. So it can deminish structure negative influence resulted from torsion effect.