本文選題：IDA方法 + RC框架結(jié)構(gòu)�。� 參考：《蘇州科技大學(xué)》2017年碩士論文

【摘要】：發(fā)生地震時(shí),若RC框架結(jié)構(gòu)的變形到達(dá)倒塌極限時(shí),就會(huì)發(fā)生倒塌破壞。近年來鋼筋混凝土框架結(jié)構(gòu)倒塌失效準(zhǔn)則有很多,但在實(shí)際應(yīng)用時(shí)如何選擇倒塌判定準(zhǔn)則沒有定論,而且建筑物的倒塌是造成人員傷亡和財(cái)產(chǎn)損失的主要原因。因此,對(duì)RC框架結(jié)構(gòu)建立一個(gè)較為準(zhǔn)確的倒塌失效準(zhǔn)則就變得尤為重要。基于此,本文引入增量動(dòng)力分析方法,對(duì)鋼筋混凝土框架結(jié)構(gòu)在地震作用下的倒塌進(jìn)行了深入的研究。主要工作及結(jié)論如下:(1)對(duì)國(guó)內(nèi)外RC框架結(jié)構(gòu)倒塌失效準(zhǔn)則進(jìn)行總結(jié)并得出六種倒塌失效準(zhǔn)則,分別為基于強(qiáng)度、變形、能量、變形和能量雙參數(shù)、剛度和IDA方法失效準(zhǔn)則。選擇其中的基于IDA方法和變形的失效準(zhǔn)則進(jìn)行倒塌對(duì)比分析。(2)在進(jìn)行增量動(dòng)力分析之前,考慮到所選地震記錄反應(yīng)譜平臺(tái)段與場(chǎng)地的卓越周期Ts的影響,而根據(jù)反應(yīng)譜的兩個(gè)頻率段選取10條地震波,運(yùn)用SeismoSingnal地震動(dòng)分析軟件確定Sa(T1,5%),最后運(yùn)用huntfill不等步調(diào)幅原則對(duì)其進(jìn)行調(diào)幅。采用SAP2000有限元軟件建立一個(gè)十層三跨RC框架分析模型并對(duì)其中一榀進(jìn)行一系列彈塑性時(shí)程分析,把得到的IM和DM連接成IDA曲線并利用“折半取中”的方法得到倒塌狀態(tài)點(diǎn)。(3)計(jì)算出建筑結(jié)構(gòu)倒塌狀態(tài)點(diǎn)處對(duì)應(yīng)的調(diào)幅系數(shù),對(duì)地震記錄進(jìn)行調(diào)幅后并再次進(jìn)行彈塑性時(shí)程分析;然后在分析時(shí)程中找出層間位移角達(dá)到變形限值1/50時(shí)及最后時(shí)刻出鉸圖,對(duì)梁柱的出鉸情況進(jìn)行分析總結(jié)得出:基于變形的倒塌失效準(zhǔn)則有低估結(jié)構(gòu)抗倒塌能力的風(fēng)險(xiǎn)并且IDA準(zhǔn)則比變形準(zhǔn)則較低的評(píng)價(jià)了結(jié)構(gòu)的損傷。(4)定義了殘余層間位移角的概念,并把其作為結(jié)構(gòu)損傷指標(biāo)運(yùn)用在IDA分析中。通過與結(jié)構(gòu)損傷指標(biāo)為層間位移角的IDA倒塌分析進(jìn)行對(duì)比得出:后者對(duì)結(jié)構(gòu)抗倒塌性能的評(píng)估大于前者,而前者更為敏感。(5)通過運(yùn)用不同結(jié)構(gòu)損傷指標(biāo)的IDA方法對(duì)結(jié)構(gòu)進(jìn)行易損性分析并對(duì)易損性曲線進(jìn)行對(duì)比中發(fā)現(xiàn)DM為殘余層間位移角進(jìn)行IDA分析得到的易損性曲線對(duì)地震作用下倒塌風(fēng)險(xiǎn)的評(píng)估偏于保守,適合于一些重要性更高的結(jié)構(gòu)。
[Abstract]:When an earthquake occurs, if the deformation of RC frame structure reaches the collapse limit, it will collapse and destroy. In recent years, there are many collapse failure criteria for reinforced concrete frame structures, but how to choose collapse criteria in practical application is not conclusive, and the collapse of buildings is the main cause of casualties and property losses. Therefore, it is very important to establish a more accurate collapse failure criterion for RC frame structure. Based on this, the incremental dynamic analysis method is introduced to study the collapse of reinforced concrete frame structures under earthquake. The main work and conclusions are as follows: (1) the collapse failure criteria of RC frame structures at home and abroad are summarized and six collapse failure criteria are obtained, which are based on strength, deformation, energy, deformation and dual parameters of energy, stiffness and IDA method. A comparative collapse analysis based on IDA method and deformation-based failure criterion is selected. Before the incremental dynamic analysis is carried out, the effects of the selected seismic response spectrum platform segment and the site excellent period ts are taken into account. According to the two frequency bands of the response spectrum, 10 seismic waves are selected, and the SeismoSingnal ground motion analysis software is used to determine the huntfill T1 / 5. Finally, the huntfill principle of unequal step amplitude is used to modulate the amplitude. A 10-story three-span RC frame analysis model was established by using SAP2000 finite element software, and a series of elastic-plastic time-history analysis was carried out on one of them. The obtained IM and DM are connected to the IDA curve and the collapse state point is obtained by the method of "half-fold".) the amplitude modulation coefficient at the collapse state point of the building structure is calculated, and the amplitude modulation of the seismic record is carried out and the elastic-plastic time-history analysis is carried out again. Then, in the analysis process, when the displacement angle between the floors reaches the deformation limit of 1 / 50 and at the last moment, the hinge diagram is found. From the analysis of Liang Zhu's hinge condition, it is concluded that the collapse failure criterion based on deformation has the risk of underestimating the collapse resistance of the structure and that the IDA criterion is lower than the deformation criterion in evaluating the damage of the structure. (4) the concept of the displacement angle between the residual layers is defined. It is used as structural damage index in IDA analysis. By comparing with the IDA collapse analysis with the structural damage index as the interstory displacement angle, it is concluded that the evaluation of the latter for the collapse resistance of the structure is greater than that for the former. The former is more sensitive. 5) by using the IDA method of different structural damage indexes to analyze the vulnerability of structures and compare the vulnerability curves, it is found that DM is the vulnerability curve obtained by IDA analysis of residual interlayer displacement angle. The assessment of the risk of collapse due to earthquake is conservative. Suitable for some of the more important structures.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.4

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