【作者】 丁来军；

【导师】 谢礼立； 翟长海；

【作者基本信息】 哈尔滨工业大学 ， 结构工程， 2009， 硕士

【摘要】 自1968年英国Ronan Point公寓倒塌事件发生以来,结构的连续倒塌越来越受到工程界的关注。40年来,国外已经编制了相应的设计规范,而我国也在制定相关的规范。连续倒塌主要考虑结构局部构件失效后,能否形成新的传力路径,使竖向荷载得到重新分配。地震作用下局部构件失效后,结构的荷载重分布涉及水平与竖向荷载,因此连续倒塌的一些研究方法对研究地震作用下的连续倒塌问题就不再适用,例如拆除构件法。但可以通过借鉴研究连续倒塌的一些研究思路来研究地震作用下构件截面及构件失效后对结构的影响。利用非线性有限元软件ABAQUS对符合我国现行钢筋混凝土设计规范的四层、八层钢筋混凝土框架结构进行Pushover分析。通过研究构件一端截面及构件两端截面失效对结构周期、极限承载力、安全储备的影响,从中提出评估关键构件截面及构件的方法,并确定结构的关键构件截面和关键构件;研究构件一端截面及构件两端截面失效后结构层间位移角变化情况和梁端弯矩重分布情况,进而考查构件一端截面及构件两端截面失效对结构的影响范围。对于中低层钢筋混凝土框架结构,结构的变形以剪切变形为主,造成结构的层间位移角底部楼层偏大而上部楼层较小。应用结构局部失效对结构的影响探讨通过强化结构的关键构件和弱化次要构件来实现结构层间位移角更加均匀的可行性。更多还原

【Abstract】 The structural engineering community had begun to focus on the progressive collapse of structures since the collapse of the Ronan Point Tower in United Kingdom in 1968. A lot of researches on this issue were conducted in the past 40 years in the Europe and the United States, and many relevant design codes or guidelines have been published. Nowadays, China is developing code provision on the prevention of structural progressive collapse. Progressive collapse, due to the loss of one or more load-carrying members, mainly concerns on whether the structure can seek the alternative load path of transmitting the vertical loads to structural elements or not. When the local failure of the structure takes place under the earthquake excitation, the load redistribution of the structure involves the horizontal and vertical loads redistributions. Therefore, some research methods of progressive collapse are not suitable for researching the issues considering earthquake excitation, such as the alternative path method. However, it can reference the method of studying the progressive collapse to research the influence of member section failure or member failure on the structure under the earthquake excitation.Two reinforced concrete frames designed according to current code (GB50011-2001) are analyzed with pushover analysis using the nonlinear finite element software ABAQUS. The influence of one end of member section failure and two end of member section failure under earthquake excitation on structural period, structural ultimate strength and structural safety margin is discussed. The method of identifying the relative importance member section and member is proposed, and the method is then used to find out the key member section and member. The study mainly focuses on the story drift and load redistribution which influenced by the member section failure failure under earthquake excitation.For median and low-rise reinforced concrete frame, the structures are dominated by shear deformation, which leads to the story drift of the bottom story large while the upper story small. Using the influnce of local failure on the structures, the possibility of realizing homogenization of the story drift is discussed by strengthening the key member of the bottom story and weakening econdary member of the upper story.更多还原