全局性能水准与构件局部损伤状态相关性研究
发布时间：2019-01-11 08:05
【摘要】：传统的最大层间位移作为一个全局性的性能指标,超出给定的性能极限状态阈值就不能映射构件局部损伤状态。本文基于能量平衡原理,将塑性能量耗散和塑性铰的等效能相比得到累积塑性应变,将累积塑性应变这一反映局部损伤状态的损伤指标作为工程需求参数,假定一系列累积塑性应变阈值建立局部构件的易损性曲线族。以传统的最大层间位移作为反映全局性能水准的工程需求参数,建立结构全局性能极限状态下的易损性曲线。对比全局和局部易损性曲线,发现全局性能水准和局部构件损伤状态之间存在良好的相关性,通过易损性曲线的吻合程度可获得给定全局性能水准相对应的累积塑性应变阈值。进而也建立起全局性能指标与局部损伤状态的映射关系。基于累积塑性应变的机构易损性分析是一种更精确的易损性分析方法。
[Abstract]:As a global performance index, the traditional maximum interstory displacement cannot map the local damage state of the component beyond the given threshold of the performance limit state. Based on the principle of energy balance, the cumulative plastic strain is obtained by comparing the plastic energy dissipation with the equivalent efficiency of plastic hinge, and the cumulative plastic strain, a damage index reflecting the local damage state, is taken as the engineering requirement parameter. A series of cumulative plastic strain thresholds are assumed to establish the vulnerability curve family of local members. Taking the traditional maximum interstory displacement as the engineering requirement parameter reflecting the global energy leveling, the vulnerability curve of the structure under the limit state of global energy is established. By comparing the global and local vulnerability curves, it is found that there is a good correlation between the global energy level and the damage state of local components, and the cumulative plastic strain threshold corresponding to the given global energy level can be obtained by the coincidence of the vulnerability curve. Furthermore, the mapping relationship between global performance index and local damage state is also established. The mechanism vulnerability analysis based on cumulative plastic strain is a more accurate method.
【作者单位】： 西北工业大学力学与土木建筑学院;
【基金】：国家自然科学基金(51278420) 西北工业大学研究生创意创新种子基金(Z2016094)资助项目
【分类号】：TU312.3
本文编号：2406889
[Abstract]:As a global performance index, the traditional maximum interstory displacement cannot map the local damage state of the component beyond the given threshold of the performance limit state. Based on the principle of energy balance, the cumulative plastic strain is obtained by comparing the plastic energy dissipation with the equivalent efficiency of plastic hinge, and the cumulative plastic strain, a damage index reflecting the local damage state, is taken as the engineering requirement parameter. A series of cumulative plastic strain thresholds are assumed to establish the vulnerability curve family of local members. Taking the traditional maximum interstory displacement as the engineering requirement parameter reflecting the global energy leveling, the vulnerability curve of the structure under the limit state of global energy is established. By comparing the global and local vulnerability curves, it is found that there is a good correlation between the global energy level and the damage state of local components, and the cumulative plastic strain threshold corresponding to the given global energy level can be obtained by the coincidence of the vulnerability curve. Furthermore, the mapping relationship between global performance index and local damage state is also established. The mechanism vulnerability analysis based on cumulative plastic strain is a more accurate method.
【作者单位】： 西北工业大学力学与土木建筑学院;
【基金】：国家自然科学基金(51278420) 西北工业大学研究生创意创新种子基金(Z2016094)资助项目
【分类号】：TU312.3
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