水平地震力作用下钢筋混凝土异形柱框架结构设计

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.

Design of re inforced concrete structure w ith spec ia l-shaped co lumns under hor izonta l seism ic load ing

Due to the part icu la rity o f geom e t ric prope rty o f rein fo rced con cre te specia l-sh aped cro ss-sect ion, st ructura l response in dif fe ren t ho r izon tal se ism ic direct ions shou ld be taken in to accoun t. A cco rding to an ex am p le, re in fo rced concrete st ructure w ith specia l-shaped co lum ns w as ana ly zed in d if feren t ho r izo nta l se ism ic direct ions. N a tu ra l period o f v ib rat ion, ax ia l comp ressive rat io, bo t tom shear o f co lum n and d rift ang le w ere also resea rched. T he resu lt dem onst ra tes the specia l-shaped co lumn o f L sect ion ha s stronge r d irect ion. T h e d irect ions o f 45 deg ree and 45 neg a tive deg ree shou ld be taken in to accoun t. P lane p lacem en t o f specia l-sh aped co lum ns shou ld be ad ju sted tha t it s cen ter o f rig idity can be clo se to cen tro id. So it can dem inish st ructu re neg a tiv e in f luence resu lted from to rsion e ffect.