考慮主震損傷場景和余震譜形的RC框架余震倒塌易損性
發(fā)布時間：2019-03-05 08:10
【摘要】：歷史地震記錄表明:一次主震過后通常伴有多次余震的發(fā)生。結(jié)構(gòu)在遭受主震損傷后,在余震作用下發(fā)生倒塌的可能性大大增加。然而,現(xiàn)有的設(shè)計規(guī)范和相關(guān)研究,對主震損傷結(jié)構(gòu)的抗余震倒塌能力評估不足。為此,本文以一棟四層和一棟八層鋼筋混凝土框架結(jié)構(gòu)為研究對象,考慮不同主震損傷場景和余震譜型的影響,對主震損傷結(jié)構(gòu)的余震倒塌易損性進行深入研究,主要研究內(nèi)容如下:(1)研究余震次數(shù)和強度對RC框架結(jié)構(gòu)地震反應的影響。分別采用最大層間位移角、最大頂點位移以及改進的Park-Ang損傷指數(shù)作為結(jié)構(gòu)的反應參數(shù),選擇一組具有多次余震記錄的主余震序列作為輸入,選擇具有大震級的余震與主震組成具有一次余震記錄的主余震序列,將結(jié)構(gòu)在多次余震作用下的反應與其在一次余震作用下的反應進行對比,對結(jié)構(gòu)增量損傷的影響進行對比。進一步考慮主余震PGA以及Arias強度與結(jié)構(gòu)增量損傷之間的關(guān)系,初步分析余震強度對結(jié)構(gòu)在主余震序列作用下增量損傷的影響。(2)開展考慮主震損傷場景的RC框架結(jié)構(gòu)余震倒塌易損性分析。采用三類方法來模擬結(jié)構(gòu)主震損傷場景,包括:Pushover方法、一次時程分析和多次時程分析方法。采用上述三種方法對結(jié)構(gòu)施加不同等級的主震損傷,進而對主震損傷結(jié)構(gòu)進行余震倒塌易損性分析。通過對比不同主震損傷場景對應的余震倒塌易損性分析結(jié)果進行對比,研究主震損傷場景對余震倒塌易損性的影響。(3)開展考慮余震譜形的RC框架結(jié)構(gòu)倒塌易損性分析。根據(jù)本文所選擇的余震記錄譜形的大小對本文已獲得的余震倒塌易損性分析結(jié)果進行分類,分析余震譜形對余震倒塌易損性的影響。進一步針對目標譜形參數(shù)ε為±2、±1和0的情況,對結(jié)構(gòu)進行余震倒塌易損性的修正。
[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 鹵2, 鹵1 and 0, the vulnerability of aftershock collapse of the structure is modified.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375.4;TU312.3
本文編號：2434698
[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 鹵2, 鹵1 and 0, the vulnerability of aftershock collapse of the structure is modified.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375.4;TU312.3
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