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  本文關(guān)鍵詞：鋼筋混凝土掉層框架結(jié)構(gòu)抗連續(xù)性倒塌性能研究　出處：《重慶大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 掉層框架結(jié)構(gòu) 連續(xù)倒塌 拆除構(gòu)件法 豎向Pushover分析 山地建筑

【摘要】：因1968年英國“Ronan Point”事故，結(jié)構(gòu)抗連續(xù)倒塌問題備受關(guān)注，40多年來各國學(xué)者對結(jié)構(gòu)抗連續(xù)倒塌做了大量研究并得出許多重要成果，但與掉層框架結(jié)構(gòu)抗連續(xù)倒塌相關(guān)的研究幾乎沒有。 掉層框架結(jié)構(gòu)是山地建筑結(jié)構(gòu)中較為典型的結(jié)構(gòu)形式，不等高接地使得該類結(jié)構(gòu)具有豎向不不規(guī)則性，且上接地層柱底約束差異導(dǎo)致柱的側(cè)移剛度不同，這使得掉層框架結(jié)構(gòu)抗連續(xù)性倒塌性能可能不同于一般的框架結(jié)構(gòu)。另一方面，邊坡失穩(wěn)也可能導(dǎo)致結(jié)構(gòu)發(fā)生倒塌�；诖�，有必要開展掉層框架結(jié)構(gòu)的抗連續(xù)倒塌性能的研究。 本文主要工作如下： ①總結(jié)了結(jié)構(gòu)抗連續(xù)倒塌的設(shè)計和分析方法，重點分析了拆除構(gòu)件法并指出應(yīng)用時應(yīng)注意的關(guān)鍵問題，同時對其進行了校驗。 ②參照GSA2003、應(yīng)用SAP2000分析軟件，采用拆除構(gòu)件法從掉層層數(shù)、掉層跨數(shù)、上接地方式、抗震設(shè)防烈度及邊坡失穩(wěn)五方面對掉層框架結(jié)構(gòu)抗連續(xù)倒塌性能的影響進行了研究。 ③基于掉層框架結(jié)構(gòu)的結(jié)構(gòu)及受力特點，提出了增設(shè)支撐、提高局部樓層梁的配筋以及掉層梁與擋墻連接三種提高抗連續(xù)倒塌能力的措施，并對這些措施的有效性進行了分析，給出了相應(yīng)的設(shè)計建議。 本文得到的主要結(jié)論有： ①掉層框架結(jié)構(gòu)抗連續(xù)倒塌性能較一般結(jié)構(gòu)更不利，，其抗連續(xù)倒塌能力變化規(guī)律為：總層數(shù)一定時，隨掉層層數(shù)增加而降低；總跨數(shù)一定時，隨掉層跨數(shù)增加而提高；上接地柱底剛接結(jié)構(gòu)比柱底鉸接結(jié)構(gòu)的抗連續(xù)倒塌能力弱；內(nèi)柱失效結(jié)構(gòu)發(fā)生連續(xù)倒塌破壞風險最大，對結(jié)構(gòu)抗連續(xù)倒塌起控制作用的構(gòu)件是與失效柱上部相連的梁。 ②按6度抗震設(shè)防烈度設(shè)計的掉層框架結(jié)構(gòu)的抗連續(xù)倒塌能力不足，隨著抗震設(shè)防烈度的提高，控制框架結(jié)構(gòu)配筋的內(nèi)力組合由非地震作用效應(yīng)參與組合轉(zhuǎn)為地震作用效應(yīng)參與的組合，結(jié)構(gòu)的抗連續(xù)倒塌能力明顯提高。 ③對于設(shè)置有支撐的掉層框架結(jié)構(gòu)，只有失效柱位于支撐所在跨內(nèi)時，結(jié)構(gòu)抗連續(xù)倒塌能力才能得到提高；支撐設(shè)置于失效柱以上一層時，支撐對結(jié)構(gòu)抗連續(xù)倒塌能最有利，隨著支撐設(shè)置位置的升高，支撐對結(jié)構(gòu)抗連續(xù)倒塌能力提高效果逐漸降低。 ④對于按6度（0.05g）抗震設(shè)防設(shè)計的掉層框架結(jié)構(gòu)，當上接地以上30%的樓層及與上接地面平齊的樓層的梁配筋量提高30%~35%時，掉層框架結(jié)構(gòu)基本具備抗連續(xù)倒塌能力；相對下接地柱失效而言，梁配筋量的增加對提高上接地柱失效剩余結(jié)構(gòu)抗連續(xù)倒塌能力作用更明顯。 ⑤下接地部分的梁與擋墻連接方式采用剛接對提高結(jié)構(gòu)連續(xù)倒塌能力的作用比采用鉸接的明顯，但其提高作用僅對下接地臨擋墻的一榀框架柱破壞情況有效，且隨著上接地以上層數(shù)增加，掉層梁與擋墻剛接連接對結(jié)構(gòu)抗連續(xù)倒塌能力的提高作用越來越不明顯。
[Abstract]:Due to the "Ronan Point" accident in Britain in 1968, the problem of continuous collapse of structures has attracted much attention. For more than 40 years, many scholars have done a lot of research on the continuous collapse of structures and obtained many important results, but there is almost no research related to the continuous collapse of falling frame structures. Falling floor frame structure is a typical structure form in mountain building structure. Different height earthing makes this kind of structure not irregular in vertical direction, and the lateral stiffness of column is different due to the constraint difference of upper grounding layer column bottom. This makes the continuous collapse behavior of the falling floor frame structure different from that of the general frame structure. On the other hand, the slope instability may also lead to the collapse of the structure. It is necessary to study the continuous collapse resistance of falling floor frame structure. The main work of this paper is as follows: The main contents are as follows: 1. The design and analysis methods of continuous collapse resistance of structures are summarized. The method of removing components is analyzed and the key problems in application are pointed out. At the same time, the key problems are verified. (2) referring to GSA2003, using SAP2000 analysis software, adopting the method of removing component from falling layer number, falling layer span number, and grounding mode. The effects of seismic fortification intensity and slope instability on the continuous collapse resistance of floor-falling frame structures are studied. 3. Based on the structure and stress characteristics of falling floor frame structure, three measures are put forward to improve the ability to resist continuous collapse by adding support, improving the reinforcement of local floor beam and connecting the falling floor beam and retaining wall. The effectiveness of these measures is analyzed and the corresponding design suggestions are given. The main conclusions of this paper are as follows: (1) the continuous collapse resistance of the falling floor frame structure is more unfavorable than that of the general structure, and the variation rule of its continuous collapse resistance ability is as follows: when the total layer number is fixed, it decreases with the increase of the falling layer number; When the total span number is constant, the total span number increases with the increase of the falling layer span number. The resistance to continuous collapse of the rigid-jointed structure at the bottom of the above earthing column is weaker than that of the hinged structure at the bottom of the column. The failure risk of the failure structure of internal column is the greatest. The member that controls the continuous collapse of the structure is the beam connected to the upper part of the failure column. (2) the continuous collapse resistance of the falling floor frame structure designed according to the 6 degree seismic fortification intensity is insufficient, with the increase of seismic fortification intensity. The combination of internal forces controlling the reinforcement of frame structure is changed from non-seismic effect to seismic effect, and the ability of resisting continuous collapse of frame structure is improved obviously. (3) for the falling floor frame structure with bracing, the anti-collapse ability of the structure can be improved only when the failure column is located in the span of the bracing; When the bracing is located above the failure column, the bracing is most favorable to the continuous collapse energy of the structure. With the increase of the position of the bracing, the effect of improving the ability of the bracing to resist the continuous collapse decreases gradually. 4 for the falling floor frame structure which is designed according to the 6 degree 0. 05 g) seismic fortification, the amount of beam reinforcement on the 30% floor above the ground level and the floor level with the upper ground is increased by 30 ~ 35 times. The falling floor frame structure basically has the ability to resist continuous collapse. Compared with the failure of the lower grounding column, the increase of beam reinforcement is more obvious to improve the continuous collapse resistance of the residual structure with the upper grounding column failure. (5) the connection between beam and retaining wall in the lower earthing part is more effective than hinge connection in improving the continuous collapse ability of the structure, but it is only effective for the failure of a frame column of the next earthing temporary retaining wall. With the increase of the number of layers above the ground, the effect of the rigid connection between the falling beam and the retaining wall on the continuous collapse resistance of the structure is less and less obvious.
【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】：TU375.4;TU312.3

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