考虑双向地震激励的标准化地震输入能量反应谱研究

发布时间：2018-04-22 00:05

本文选题：地震输入能量 + 双向地震激励　；参考：《工程力学》2014年05期

【摘要】：以往地震输入能量谱的研究几乎都是以单自由度体系和单向地震输入为前提,没有考虑地震动的多维性和结构非线性反应的空间耦合性。于是,建立单质点双自由度体系,假设体系的弹塑性关系为满足二维屈服面函数的理想弹塑性形式,基于此模型提出双向地震动作用下标准化的地震输入能量反应谱理论。以硬土、中硬(软)土和软土三类场的地震记录作为体系的双向激励,建立统计平均的等延性系数标准化地震输入能量谱。分析场地类别、延性系数、两水平主轴方向周期比对标准化地震输入能量谱的影响。分析表明:各类场地分别具有独自的谱形特征和规律性;延性系数对硬土场地和中硬(软)土场地的谱值影响较明显,而对于软土场地,除长周期外影响很小;周期比ζ对谱值具有一定影响;基于单自由度体系建立的输入能量谱在某些情况下会高估能量反应。
[Abstract]:In the past, the study of seismic input energy spectrum is almost based on the single degree of freedom system and unidirectional seismic input, without considering the multi-dimensional property of ground motion and the spatial coupling of nonlinear response of structure. Therefore, a two-degree-of-freedom system with single mass points is established. The elastoplastic relationship of the system is assumed to be an ideal elastoplastic form satisfying the two-dimensional yield surface function. Based on this model, a standardized response spectrum theory of seismic input energy under the action of bi-directional ground motion is proposed. Taking the seismic records of hard soil, middle hard (soft) soil and soft soil as the bidirectional excitation of the system, the statistical average equal-ductility coefficient normalized seismic input energy spectrum is established. The effects of site type, ductility coefficient and direction period ratio of two horizontal principal axes on normalized seismic input energy spectrum are analyzed. The results show that each site has its own spectral characteristics and regularity, the ductility coefficient has obvious influence on the spectral value of hard soil site and medium hard (soft) soil site, but has little effect on soft soil site except for long period. The period ratio 味 has a certain influence on the spectral value, and the input energy spectrum based on the single degree of freedom system may overestimate the energy response in some cases.
【作者单位】：大连民族学院土木建筑工程学院;大连理工大学建设工程学部;
【基金】：国家自然科学基金项目(51108067) 住建部科研开发项目(2013-K2-17) 大连民族学院自主科研基金项目(DC120101095)
【分类号】：TU352.11

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