本文關(guān)鍵詞：基于概率的桿系結(jié)構(gòu)地震易損性分析及其抗震性能評(píng)估　出處：《江西理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地震易損性 鋼筋混凝土框架結(jié)構(gòu) 單層網(wǎng)殼結(jié)構(gòu) 強(qiáng)度模型 動(dòng)力失穩(wěn)模型

【摘要】：地震易損性可定義為在某一特定地震強(qiáng)度作用下,結(jié)構(gòu)發(fā)生破壞的概率,通過(guò)對(duì)結(jié)構(gòu)進(jìn)行地震易損性分析可獲得在不同等級(jí)地震作用下的結(jié)構(gòu)失效概率。因此,基于地震易損性分析的結(jié)構(gòu)抗震性能評(píng)估研究就顯得尤為重要。本文首先以一鋼筋混凝土框架結(jié)構(gòu)為例,對(duì)結(jié)構(gòu)進(jìn)行基于概率的地震易損性分析研究,然后將該研究方法拓展應(yīng)用于網(wǎng)殼結(jié)構(gòu)的地震失效概率分析,可求得網(wǎng)殼結(jié)構(gòu)的地震易損性曲線,進(jìn)而對(duì)網(wǎng)殼結(jié)構(gòu)展開(kāi)抗震性能評(píng)估。圍繞結(jié)構(gòu)的地震易損分析方法,本文開(kāi)展的研究工作有:首先介紹了結(jié)構(gòu)地震易損性的分析方法和理論,基于該方法,以一九層鋼筋混凝土框架結(jié)構(gòu)為例,建立了分析模型,求得其在50條地震動(dòng)荷載作用下的地震易損性曲線,通過(guò)對(duì)該易損性曲線分析研究,可知該結(jié)構(gòu)在地震峰值加速度為0.4g時(shí)的強(qiáng)震作用下,發(fā)生倒塌破壞的概率較低,結(jié)構(gòu)的抗震性能良好,能夠滿足結(jié)構(gòu)的抗震設(shè)防標(biāo)準(zhǔn)。同時(shí)通過(guò)對(duì)比50條與40條,50條與30條,50條與20條,50條與10條地震動(dòng)記錄下求得的地震易損性曲線的離散程度,可知進(jìn)行框架結(jié)構(gòu)地震易損性分析時(shí)采用30條地震動(dòng)記錄計(jì)算能夠滿足精度要求。然后將結(jié)構(gòu)地震易損性分析方法應(yīng)用于單層網(wǎng)殼結(jié)構(gòu),以單層球面網(wǎng)殼和單層柱面網(wǎng)殼結(jié)構(gòu)為例,分別求其地震易損性曲線,對(duì)該曲線進(jìn)行分析,得到單層網(wǎng)殼結(jié)構(gòu)的穩(wěn)定性能良好,能夠滿足結(jié)構(gòu)的抗震設(shè)防標(biāo)準(zhǔn),即在地面開(kāi)裂,結(jié)構(gòu)開(kāi)始?xì)牡那闆r下該結(jié)構(gòu)良好的穩(wěn)定性可以為人們逃生贏得時(shí)間;對(duì)比分別采用50條與40條、30條、20條、10條地震動(dòng)樣本下的地震易損性曲線,可知單層柱面網(wǎng)殼與單層球面網(wǎng)殼結(jié)構(gòu)在進(jìn)行地震易損性分析時(shí)30條地震動(dòng)樣本就能滿足計(jì)算精度要求。最后對(duì)地震下具有強(qiáng)度破壞和動(dòng)力失穩(wěn)破壞特征的網(wǎng)殼結(jié)構(gòu)分別進(jìn)行地震易損性分析,獲得其地震易損性曲線,通過(guò)對(duì)比分析可知,動(dòng)力失穩(wěn)破壞模型和強(qiáng)度破壞模型的地震易損性曲線有著相似的變化規(guī)律,并且符合網(wǎng)殼結(jié)構(gòu)抗震規(guī)范對(duì)柱面網(wǎng)殼結(jié)構(gòu)抗震性能的要求,這樣就說(shuō)明以網(wǎng)殼結(jié)構(gòu)的性能水準(zhǔn)破壞指標(biāo)來(lái)對(duì)結(jié)構(gòu)進(jìn)行基于動(dòng)力失穩(wěn)前的地震易損性研究是可行的。采用基于概率的地震易損性分析方法對(duì)桿系結(jié)構(gòu)進(jìn)行地震易損分析適用高效,且分析結(jié)果與現(xiàn)行的抗震規(guī)范對(duì)比具有一致性,為對(duì)結(jié)構(gòu)進(jìn)行概率風(fēng)險(xiǎn)評(píng)估提供了簡(jiǎn)單可靠的研究方法。
[Abstract]:Seismic vulnerability can be defined as the probability of structure failure under the action of a certain earthquake intensity. The failure probability of structure under the action of different magnitude earthquakes can be obtained by analyzing the seismic vulnerability of the structure. It is very important to evaluate the seismic performance of structures based on seismic vulnerability analysis. Firstly, taking a reinforced concrete frame structure as an example, the probabilistic seismic vulnerability analysis is carried out. Then, the research method is extended to the seismic failure probability analysis of reticulated shell structure, and the seismic vulnerability curve of the latticed shell structure can be obtained. Then the seismic performance evaluation of reticulated shell structures is carried out. Around the seismic vulnerability analysis method of the structure, the research work carried out in this paper is as follows: firstly, the analysis method and theory of seismic vulnerability of the structure are introduced, based on this method. Taking the 1-9-story reinforced concrete frame structure as an example, an analytical model is established, and the seismic vulnerability curves under 50 ground motion loads are obtained. It is known that under the action of strong earthquake with a peak acceleration of 0.4g, the probability of collapse and failure of the structure is low, and the seismic performance of the structure is good. It can satisfy the seismic fortification standard of structure. At the same time, by comparing 50 pieces with 40 pieces 50 and 30 pieces 50 and 20. The dispersion degree of seismic vulnerability curves obtained from 50 and 10 seismic records. It is known that the seismic vulnerability analysis of frame structures can meet the accuracy requirements by using 30 seismic records. Then the seismic vulnerability analysis method is applied to single-layer latticed shell structures. Taking single-layer spherical latticed shell and single-layer cylindrical latticed shell as examples, the seismic vulnerability curves are obtained, and the results show that the stability of single-layer latticed shell structure is good and can meet the standard of seismic fortification. That is, when the ground cracks and the structure begins to be destroyed, the good stability of the structure can buy time for people to escape. The seismic vulnerability curves of 50 and 40 or 30 or 20 or 10 ground motion samples were compared respectively. It can be seen that 30 samples of ground motion can meet the requirement of accuracy in seismic vulnerability analysis of single-layer cylindrical latticed shell and single-layer spherical latticed shell structure. Finally, the mesh with the characteristics of strength failure and dynamic instability failure under earthquake can be satisfied. The seismic vulnerability of shell structure is analyzed separately. Through the comparison and analysis, it is known that the dynamic instability failure model and the strength failure model have similar changes in the seismic vulnerability curve. The seismic behavior of cylindrical latticed shell structure is in accordance with the seismic code of latticed shell structure. This shows that it is feasible to use the performance leveling failure index of reticulated shell structure to study the seismic vulnerability of the structure before dynamic instability. The probabilistic seismic vulnerability analysis method is used to carry out the seismic analysis of the bar structure. Vulnerability analysis is applicable and efficient. The analysis results are consistent with the current seismic code, which provides a simple and reliable method for the probabilistic risk assessment of structures.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU311.3;TU323

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