RC框架结构多层次刚度损伤演化计算

摘要

The generalized damage variable is defined based on a deformation equivalent principle. Stiffness damage of each level can be calculated by stiffness damage integration from material⁃level. This method can be used to evaluate the stiffness damage for material, section, member, story, and structure. The numerical simulation model of the“single span 12⁃story RC frame model test” was built by using the software ABAQUS. Multi⁃level stiffness damage evolution of this model was analyzed. The numerical results show that under El Centro seismic motion, Story 3⁃7 were damaged seriously with the beam⁃hinge failure mode;story 8 was damaged seriously with the column⁃hinge failure mode;the end sections of the columns and beams of story 3⁃8 were damaged seriously with concrete crushing. The accordance of the numerical and experimental results shows the multi⁃level stiffness damage evolution analysis can reflect the structural inhere damage mechanism.%基于提出的变形等价原理定义了广义损伤变量，给出了“材料、截面、构件、楼层、结构”多层次刚度损伤的计算方法，各层次的刚度损伤可由材料刚度损伤积分求得。利用ABAQUS软件建立了“单跨12层钢筋混凝土标准框架模型试验”的计算模型，计算分析了结构各层次的刚度损伤演化过程。计算结果表明：在El Centro地震波三向作用下，结构的3～7层损伤严重且为梁铰破坏模式，第8层损伤严重且为柱铰破坏模式；构件端部截面破坏严重，3～8层构件端部截面的受压区混凝土被压碎。数值分析结果与试验结果基本一致，说明多层次刚度损伤演化分析能够正确反映结构破坏的内在机制。