基于结构连续性倒塌的L形RC框架结构平面柱网布置应用研究

发布时间：2018-08-08 15:35

【摘要】：钢筋混凝土框架结构是我国目前应用最广泛的结构体系,其安全问题一直备受工程师的关注。钢筋混凝土框架结构如果在偶然荷载作用下发生局部的构件破坏,则很容易引起结构的整体连续性倒塌,造成极大的人员伤亡和财产损失。本文以平面不规则的L形RC框架结构为研究基础,通过改变结构平面柱网布置分析结构的抗连续倒塌能力。本文主要结论如下:①通过对本文所选取的L形框架结构拟拆除柱构件敏感性系数的分析,其中角柱的敏感性系数最大,表明角柱的破坏对结构抗连续倒塌性能的影响比其他框架柱更明显,角柱在L形框架结构抗连续倒塌中更重要。②PKPM计算的六种平面柱网布置形式的L形RC框架结构最大层间位移角均小于规范规定的限值1/550,且结构最小的最大层间位移角为方案六。X向的层间位移比最小的为方案一,其值等于1.03,Y向的层间位移比最小为方案六,其值等于1.18,均满足规范规定的不超过1.2的限值条件。即本文所选模型符合规范和设计的要求。③通过SAP2000有限元软件对六种柱网布置进行结构抗连续性倒塌分析,当方案一、三的顶层角柱和方案二的顶层和底层角柱失效后,其位移值超过规范规定的限值,即结构将发生连续倒塌破坏;对于其他拟失效柱的破坏,失效节点的位移均会出现平缓阶段,即结构经过内力重分布后,将会形成新的平衡体系。④以结构各构件的敏感性系数为评判标准,对比分析了六种柱网布置形式对结构抗连续倒塌性能的影响大小,L形框架结构中不同的平面拐角柱网布置形式对提高结构抗连续倒塌性能的优劣顺序为:方案六、方案四、方案五、方案一、方案三、方案二。即当结构平面拐角柱网沿双向均匀布置时能使结构具有较好的抗连续倒塌能力。
[Abstract]:Reinforced concrete frame structure is the most widely used structural system in China at present. If the local members of reinforced concrete frame structures are destroyed under accidental loads, it is easy to cause the continuous collapse of the whole structure, resulting in great casualties and property losses. In this paper, based on the L-shaped RC frame structure with irregular plane, the ability of resisting continuous collapse of the structure is analyzed by changing the layout of the plane cylindrical grid of the structure. The main conclusions of this paper are as follows: (1) by analyzing the sensitivity coefficient of L-shaped frame structure which is selected in this paper, the sensitivity coefficient of corner column is the largest. The results show that the failure of corner columns has more obvious effect on the continuous collapse resistance of structures than other frame columns. The maximum Interstory displacement Angle of L-shaped RC frame structure calculated by PKPM in six Plain Cylindrical layout forms is less than the limit of 1 / 550 specified in the Code, and the minimum maximum Interlayer displacement of the structure The minimum displacement ratio of the floor with the displacement angle of scheme VI. X is the first scheme. The minimum value of the interstory displacement ratio equal to 1.03y is scheme 6, and its value is 1.18, all of which meet the limit of 1.2 specified in the code. That is to say, the model selected in this paper meets the requirements of code and design. 3. Through SAP2000 finite element software, six kinds of cylindrical layout are analyzed against continuous collapse. When the top corner column of scheme one and three and the top and bottom corner column of scheme two fail, The displacement value exceeds the limit specified in the code, that is, the structure will collapse and destroy continuously. For the failure of other pseudo-failure columns, the displacement of the failure node will appear at a gentle stage, that is, after the structure has been redistributed by internal force, Will form a new balance system .4 based on the sensitivity coefficient of each component of the structure as the criterion, The effects of six types of column layout on the continuous collapse resistance of structures are compared and analyzed. The order of the different plane corner column layout in the L-shaped frame structure to improve the continuous collapse resistance is as follows: scheme six, scheme four, and so on. Options V, I, III, II. That is to say, when the structure plane corner cylinder network is arranged uniformly in both directions, it can make the structure have better ability to resist continuous collapse.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4

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