对竖向非规则框架设计的思考

结合工程设计实践，分析单榀钢筋混凝土竖向非规则框架的受力机理：传力路线长，受力构件多；刚度变化：水平刚度沿着高度方向有突变，应力集中现象严重；变形特点：各柱的竖向变形差异较大，必须考虑对结构整体内力的计算影响；抗震设防要求：采用强柱弱梁设计，形成延性结构。通过与规则框架的比较，提出竖向非规则框架属于抗震不利的结构形式，实际问题的处理应从结构布置、内力与配筋计算、构造措施等方面加以综合考虑。

Study on vertical irregular frame design

Base on the practice of engineering design, we analyze/our key points of a vertical irregular reinforced concrete frame; 1） mechanical mechanism, long paths of load transfer and too many stressed components; 2） change of rigidity, the severe phenomenon of the sudden change of horizontal rigidity along height and stress concentration; 3） deformation characteristics, due to big differences in vertical deformation of columns, the influence of the internal force calculation in monolithic construction should be considered; 4） the requirement of anti-seismic measures, using the design method of strong column weak beam to make structure be ductile. Compared with regular frame, the vertical irregular frame is not a high-reliability structure on earth-quake resistance. Structure arrangement, calculation of internal force and reinforcement, conformation measure should be considered in the design of engineering projects.