【摘要】 基于钢筋砼杆件截面的轴力-弯矩-曲率关系,建立了考虑杆件P-Δ效应和剪切变形且能分析框架极限状态的非线性有限元法。提出了改进能力谱法,定义了砼框架结构唯一的延性系数,确定Pushover曲线的极限状态点为性能点,通过性能点位于由延性系数所折减的非弹性需求谱曲线上的条件,求出框架的最大抗震谱加速度,评估框架的抗震性能。兼顾承载能力,得出相对受压区高度0.25―0.35,轴压比0.6―0.8的框架,具有较好的抗震性能。更多还原

【Abstract】 Based on the relationship among axial force-bending moment-curvature on the section of the reinforced concrete member, a nonlinear finite element method considering P-? effect and shear deformation of the member as well as analyzing the ultimate state of the frame is established. Thusly, an improved capacity spectrum method is put forward, the unique ductility factor of concrete frame is defined and the point of ultimate state in Pushover curve is determined as the demand point. On the condition that the demand point locates at the inelastic demand spectrum curve reduced by ductility factor, the maximum seismic spectrum acceleration is obtained to evaluate the seismic behavior of the frame. By balancing load carrying capacity, it’s concluded that the frames with 0.25―0.35 relative depth of compressive zone and 0.6―0.8 axial compressive ratios perform good seismic behavior.更多还原