Park-Ang损伤模型在弯矩-转角层面的三维拓展

Three dimensional extension of Park-Ang damage model in moment- rotation level

准确地评估构件的损伤程度是基于性能抗震设计的基础。地震作用下,钢筋混凝土墩柱的损伤一般是空间的。但目前钢筋混凝土墩柱的损伤模型大多只能考虑定轴力下单向弯曲。并且它们一般是力-位移层面的,这不利于有限元程序直接实现。针对这一问题,对Park-Ang损伤模型在弯矩-转角层面进行了三维拓展,指出了各参量在三维受力下的计算方法。拓展后的损伤模型能够考虑动轴力和双向弯曲,并且能够在有限元单元层面直接实现,有利于数值计算的自动化。

Accurately evaluating the damage of structure member is the basis of performance based seismic design.Damage of reinforced concrete piers and columns are three-dimensional under earthquake.Most of the current damage models for reinforced concrete piers and columns can only consider unidirectional bending under constant axial force.Most of them are in force-deformation level,and this is not conducive to the realization of the finite element program directly.To solve these problems,taking Park-Ang damage model as the prototype,a three dimensional damage model in moment-rotation level was raised.The definitions of the parameters in the model were detailed introduced.The extensional damage model can consider bidirectional bending and dynamic axial force.The model can also be realized in element of finite element program directly which is convenient for automation of numerical calculation.