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构件性能评估对把握大震作用下整体结构抗震性能有着非常重要的意义。以梁构件为例,现阶段梁评估参数为转角,评估标准参考FEMA-356或PEER/ATC72-1。随着计算的进一步精细化,基于材料模型的计算方法成为热点,但对该方法模拟的构件缺乏一个直观的由纤维应变反映构件性能状态的评估标准。基于平截面假定,结合钢筋本构曲线,建立力平衡方程和应变-曲率-转角方程,推导出构件转角同钢筋应变相关联的计算公式,最后根据FEMA-356的梁构件性能状态转角反算钢筋应变,为直观评估梁的性能状态提供一个量化指标。
Component performance evaluation is very important to grasp the seismic behavior of the whole structure under the action of large earthquake. Taking a beam member as an example, the current beam evaluation parameters are corner angles, and the evaluation criteria refer to FEMA-356 or PEER / ATC72-1. With the further refinement of computations, computational methods based on material models become a hot spot, but the components simulated by this method lack an intuitive assessment of the component’s performance state by fiber strain. Based on the assumption of flat section, combining with the constitutive curve of steel bar, the force equilibrium equation and strain-curvature-angle equation are established, and the formula for calculating the relation between the component corner and the steel bar strain is deduced. Finally, according to the FEMA- Strain, providing a quantitative indicator for intuitive assessment of beam performance status.