發(fā)布時間：2018-10-24 10:02

【摘要】：避免結(jié)構(gòu)的倒塌是工程結(jié)構(gòu)設(shè)計的重點(diǎn)之一，需建立比較合理的結(jié)構(gòu)倒塌判定準(zhǔn)則，來描述結(jié)構(gòu)的倒塌，，以方便學(xué)者更加深入的研究結(jié)構(gòu)抗倒塌方法。國內(nèi)外的框架結(jié)構(gòu)倒塌判定準(zhǔn)則很多，但在實(shí)際應(yīng)用時如何選擇倒塌判定準(zhǔn)則沒有定論，確定一個比較合理的結(jié)構(gòu)倒塌判定準(zhǔn)則選擇方法迫不及待。 本文對已有鋼筋混凝土框架結(jié)構(gòu)倒塌判定準(zhǔn)則進(jìn)行綜述和分析總結(jié)，并選擇本文需要對比的幾類倒塌判定準(zhǔn)則。以鋼筋混凝土平面框架結(jié)構(gòu)擬靜力倒塌試驗為基礎(chǔ)，用OpenSees有限元軟件對該結(jié)構(gòu)進(jìn)行數(shù)值模擬，然后對比分析更能反映鋼筋混凝土框架結(jié)構(gòu)倒塌的判定準(zhǔn)則。再利用OpenSees有限元軟件建立一榀五層三跨平面框架數(shù)值分析模型，進(jìn)行IDA（增量動力反應(yīng)）分析，尋找IDA倒塌判定準(zhǔn)則規(guī)定的倒塌點(diǎn)，再找出每條地震波在倒塌點(diǎn)處的地震動強(qiáng)度，并將此地震動強(qiáng)度下的地震波輸入結(jié)構(gòu)進(jìn)行彈塑性時程分析，然后對比分析鋼筋混凝土框架結(jié)構(gòu)倒塌的準(zhǔn)則。 通過分析研究，本文初步得出以下主要結(jié)論： ①本文選擇對比的四種鋼筋混凝土框架結(jié)構(gòu)倒塌判定準(zhǔn)則都能在一定程度上判斷結(jié)構(gòu)的塑性發(fā)展程度，但不是都能準(zhǔn)確說明結(jié)構(gòu)是否進(jìn)入倒塌或者接近倒塌點(diǎn)； ②基于變形的倒塌判定準(zhǔn)則（層間位移角限值1/50），有低估結(jié)構(gòu)抗倒塌能力的風(fēng)險；基于剛度的倒塌判定準(zhǔn)則（顧祥林建議準(zhǔn)則），有低估結(jié)構(gòu)應(yīng)有損傷的風(fēng)險；基于最大位移和能量的倒塌判定準(zhǔn)則（Park-Ang建議準(zhǔn)則），能準(zhǔn)確的估計結(jié)構(gòu)的倒塌點(diǎn)，與實(shí)際情況較為相符；基于IDA的倒塌判定準(zhǔn)則（ATC-63建議準(zhǔn)則），有低估結(jié)構(gòu)應(yīng)有損傷的風(fēng)險； ③本文選擇的基于變形的倒塌判定準(zhǔn)則和基于剛度的倒塌判定準(zhǔn)則計算較為方便，但不太能真實(shí)反映結(jié)構(gòu)的倒塌，在計算不需要太精確的情況下這兩種準(zhǔn)則可以作為選擇目標(biāo)；本文選擇的基于IDA的倒塌判定準(zhǔn)則計算最復(fù)雜，并且不能準(zhǔn)確判定結(jié)構(gòu)是否進(jìn)入倒塌，根據(jù)實(shí)際情況考慮選用；本文選擇的基于最大位移和能量的倒塌判定準(zhǔn)則，計算較為復(fù)雜，但是能比較準(zhǔn)確的判斷結(jié)構(gòu)是否倒塌，在計算要求較為精確的情況，此準(zhǔn)則可以作為選擇目標(biāo)。
[Abstract]:To avoid the collapse of structures is one of the key points in the design of engineering structures. It is necessary to establish more reasonable criteria for determining the collapse of structures to describe the collapse of structures, so as to facilitate scholars to study more deeply the methods of resisting collapse of structures. There are many criteria for determining the collapse of frame structures at home and abroad, but how to choose the criteria of collapse in practical application is not conclusive, so it is urgent to determine a more reasonable criterion for determining collapse of structures. In this paper, the existing criteria for judging the collapse of reinforced concrete frame structures are summarized and analyzed, and several kinds of criteria for judging collapse of reinforced concrete frame structures are selected which need to be compared in this paper. Based on the pseudostatic collapse test of reinforced concrete plane frame structure, the numerical simulation of the structure is carried out by using OpenSees finite element software, and then the criteria for judging the collapse of reinforced concrete frame structure are compared and analyzed. Then a five-story three-span plane frame numerical analysis model is established by using OpenSees finite element software. The IDA (incremental dynamic response) analysis is carried out to find the collapse point prescribed by the IDA collapse criterion, and then to find out the ground motion intensity of each seismic wave at the collapse point. The seismic wave input structure under the local vibration intensity is analyzed by elastic-plastic time-history analysis, and then the collapse criterion of reinforced concrete frame structure is compared and analyzed. Through analysis and research, the main conclusions are as follows: 1 the four criteria for judging collapse of reinforced concrete frame structures selected in this paper can judge the degree of plastic development of structures to a certain extent. But not all of them can accurately explain whether the structure enters or approaches the collapse point. 2 the collapse criterion based on deformation (the limit of displacement angle between floors is 1 / 50) has the risk of underestimating the ability of the structure to resist collapse. The collapse criterion based on stiffness (Gu Xianglin's suggestion criterion) has the risk of underestimating the damage due to the structure, and the collapse criterion based on the maximum displacement and energy (Park-Ang recommendation criterion) can accurately estimate the collapse point of the structure. The collapse criterion based on IDA (ATC-63 recommendation criterion) has the risk of underestimating the damage of the structure. (3) the collapsing criterion based on deformation and stiffness is convenient to calculate, but it can not really reflect the collapse of structure. These two criteria can be used as the choice targets when the calculation is not too accurate. The collapse criterion based on IDA is the most complicated one in this paper, and it can not accurately determine whether the structure is collapsing or not, so it can be selected according to the actual situation. In this paper, the criterion of collapse based on maximum displacement and energy is more complicated, but it can accurately judge whether the structure collapses or not. This criterion can be used as the choice target when the calculation requirement is more accurate.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU311.3;TU375.4

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