考虑主震损伤场景和余震谱形的RC框架余震倒塌易损性

发布时间：2019-03-05 08:10

【摘要】：历史地震记录表明:一次主震过后通常伴有多次余震的发生。结构在遭受主震损伤后,在余震作用下发生倒塌的可能性大大增加。然而,现有的设计规范和相关研究,对主震损伤结构的抗余震倒塌能力评估不足。为此,本文以一栋四层和一栋八层钢筋混凝土框架结构为研究对象,考虑不同主震损伤场景和余震谱型的影响,对主震损伤结构的余震倒塌易损性进行深入研究,主要研究内容如下:(1)研究余震次数和强度对RC框架结构地震反应的影响。分别采用最大层间位移角、最大顶点位移以及改进的Park-Ang损伤指数作为结构的反应参数,选择一组具有多次余震记录的主余震序列作为输入,选择具有大震级的余震与主震组成具有一次余震记录的主余震序列,将结构在多次余震作用下的反应与其在一次余震作用下的反应进行对比,对结构增量损伤的影响进行对比。进一步考虑主余震PGA以及Arias强度与结构增量损伤之间的关系,初步分析余震强度对结构在主余震序列作用下增量损伤的影响。(2)开展考虑主震损伤场景的RC框架结构余震倒塌易损性分析。采用三类方法来模拟结构主震损伤场景,包括:Pushover方法、一次时程分析和多次时程分析方法。采用上述三种方法对结构施加不同等级的主震损伤,进而对主震损伤结构进行余震倒塌易损性分析。通过对比不同主震损伤场景对应的余震倒塌易损性分析结果进行对比,研究主震损伤场景对余震倒塌易损性的影响。(3)开展考虑余震谱形的RC框架结构倒塌易损性分析。根据本文所选择的余震记录谱形的大小对本文已获得的余震倒塌易损性分析结果进行分类,分析余震谱形对余震倒塌易损性的影响。进一步针对目标谱形参数ε为±2、±1和0的情况,对结构进行余震倒塌易损性的修正。
[Abstract]:Historical seismic records show that a major earthquake is usually accompanied by multiple aftershocks. After the structure is damaged by the main earthquake, the possibility of collapse under aftershock is greatly increased. However, the existing design codes and related research are insufficient to evaluate the anti-aftershock collapse capacity of the main earthquake damage structure. Therefore, taking a four-story and eight-story reinforced concrete frame structure as the research object, considering the influence of different main earthquake damage scenarios and aftershock spectra, the vulnerability of aftershock collapse of the main earthquake damage structure is deeply studied in this paper. The main contents are as follows: (1) the influence of the number and intensity of aftershocks on the seismic response of RC frame structure is studied. The maximum inter-layer displacement angle, the maximum vertex displacement and the improved Park-Ang damage index are used as the response parameters of the structure respectively, and a group of main aftershocks with multiple aftershocks are selected as the input. The main aftershocks with a large magnitude and a primary aftershock are selected. The response of the structure under the action of multiple aftershocks is compared with the response of the structure under the action of a primary aftershock, and the effects of incremental damage of the structure are compared. The relationship between the main aftershock PGA and the Arias strength and the incremental damage of the structure is further considered. The influence of aftershock strength on incremental damage of structure under the action of main aftershock sequence is preliminarily analyzed. (2) the vulnerability analysis of aftershock collapse of RC frame structure considering the main earthquake damage scenario is carried out. Three kinds of methods are used to simulate the main earthquake damage scene, including Pushover method, one-time history analysis and multiple time-history analysis methods. The above three methods are used to apply different levels of main earthquake damage to the structure, and then the vulnerability analysis of the aftershock collapse of the main earthquake damage structure is carried out. By comparing the vulnerability analysis results of aftershock collapse corresponding to different main earthquake damage scenarios, the influence of main earthquake damage scene on the vulnerability of aftershock collapse is studied. (3) the vulnerability analysis of RC frame structure considering aftershock spectrum is carried out. According to the spectral shape of the aftershock record selected in this paper, the vulnerability analysis results of the aftershock collapse obtained in this paper are classified, and the influence of the aftershock spectrum shape on the vulnerability of the aftershock collapse is analyzed. In view of the target spectral parameters 蔚 being 卤2, 卤1 and 0, the vulnerability of aftershock collapse of the structure is modified.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4;TU312.3

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