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为研究在关键部位采用聚乙烯醇纤维增强混凝土材料的结构的地震反应,利用Perform-3D软件对一栋10层的框架-剪力墙结构进行单向罕遇地震(50年超越概率2%)作用下的非线性动力时程反应分析。结果表明,随着结构地震损伤程度的增加,纤维增强混凝土的优良性能发挥更加充分,对结构的抗震性能改善作用也更加明显;结构基本周期对应的加速度反应谱强度S_a(T_1)能较好地反映结构的损伤程度,适合作为地震动强度衡量指标。依据FEMA P695建议的增量动力分析方法,对22对地震动记录进行标准化处理和调幅,并通过结构地震易损性函数,给出结构在不同强度地震作用下达到“防止倒塌”极限状态的失效概率。对于框架-剪力墙结构,建议可采用墙肢塑性铰转角作为其“防止倒塌”极限状态地震易损性分析的结构反应参数。
In order to study the seismic response of concrete structures reinforced with polyvinyl alcohol fibers at critical locations, Perform-3D software was used to perform unidirectional rare earthquakes on a 10-story frame-shear wall structure (50% probability of overcoming 2%) Nonlinear dynamic time history response analysis under action. The results show that with the increase of structural earthquake damage, the excellent performance of fiber reinforced concrete can be more fully exerted, and the effect of improving the seismic performance of the structure becomes more obvious. The acceleration response spectrum intensity S_a (T_1) corresponding to the basic structure periodicity can be better Reflect the degree of structural damage, suitable as a measure of seismic intensity. Based on the FEMA P695 recommended incremental dynamic analysis method, 22 pairs of ground motion records are normalized and amplitude modulated, and the structural damage vulnerability function is given to show that the structure achieves the “collapse prevention” limit state under the action of different intensity earthquakes The probability of failure. For the frame-shear wall structure, it is suggested that the plastic hinge angle of the wall limbs can be used as the structural response parameter for the seismic collapse vulnerability analysis of the “collapse-proof” limit state.