RC框架结构“强柱弱梁”实现方法初步研究
发布时间：2019-05-29 23:59
【摘要】：为了使RC框架结构在地震过程中不至于瞬间倒塌,研究者们提出了“强柱弱梁”的设计理念,抗震规范通过柱端弯矩增大系数调节柱端配筋面积保证“强柱弱梁”机制的实现,但多次震害显示,大量RC框架结构由于种种原因使柱端首先出现塑性铰,形成“强梁弱柱”式破坏机制。结构在地震中的破坏是动力荷载(地震动)作用下发生的,而非设计中的静力荷载作用,而规范中规定的地震力本质上是静力。在影响“强柱弱梁”实现方面,地震动作用影响很大,不同地震动作用下结构的破坏模式可能完全不同,因此,随机选取了100条地震动,对有限元模型进行动力时程分析,给出建议的计算配筋面积的方法,以供结构抗震设计使用。本文主要工作有:(1)根据模型的荷载以及场地类型等因素对结构进行计算配筋,建立了九个不同柱端弯矩放大系数的模型;模型选用了三类场地,根据相关论文中三类场地对应的剪切波速随机挑选了100条地震动,为了探究不同地震动幅值作用下结构的反应情况,将地震动分别调幅为0.2g和0.3g两种情况,通过对比找出结构反应的差别;将节点的破坏形式分为“强柱弱梁”型破坏和“强梁弱柱”型破坏,并将“强柱弱梁”型破坏细分为四种情况;根据结构的对称性和节点所在的位置以及约束情况对节点进行分类,为接下来各类型节点的破坏形式统计提供基础。(2)判断每条地震动下结构各节点的破坏形式,并对各节点的破坏形式进行统计,列出各节点“强梁弱柱”型破坏的数量,判断破坏相对比较严重的楼层,选择该楼层为主要研究对象,对该楼层各节点破坏形式进行细分,观察各种破坏形式随柱端弯矩放大系数增大时的变化规律;单独对柱铰的数量进行统计,观察柱铰数量随柱端弯矩放大系数的变化情况,并找出每层节点相对薄弱的柱端。(3)统计柱端和梁端屈服时的轴力和弯矩,研究它们之间的相关性,并给出柱端轴力和弯矩的相关性函数曲线;观察“强梁弱柱”情况下梁柱端弯矩和轴力的分布情况,找出没有实现“强柱弱梁”的直接原因;重新建立模型,对轴力和弯矩的相关性曲线进行验证。
[Abstract]:In order to prevent the collapse of RC frame structure in the process of earthquake, the researchers put forward the design concept of "strong column weak beam". The seismic code adjusts the reinforcement area at the column end by adjusting the reinforcement area at the column end to ensure the realization of the "strong column weak beam" mechanism. However, many times of earthquake damage show that a large number of RC frame structures first appear plastic hinges at the end of the column due to various reasons, forming a "strong beam and weak column" failure mechanism. The failure of the structure in earthquake occurs under dynamic load (ground motion), not the static load in design, and the seismic force specified in the code is static in nature. In the aspect of affecting the realization of "strong column and weak beam", the seismic action has a great influence on the realization of "strong column and weak beam". The failure mode of the structure under different ground motion may be completely different. Therefore, 100 ground motion are randomly selected to analyze the dynamic time history of the finite element model. A suggested method for calculating reinforcement area is given for seismic design of structures. The main work of this paper is as follows: (1) according to the load of the model and the site type, the reinforcement of the structure is calculated, and the bending moment magnification factors of nine different columns are established. Three kinds of sites are selected in the model, and 100 ground motion are randomly selected according to the shear wave velocity corresponding to the three kinds of sites in the relevant paper. in order to explore the response of the structure under the action of different ground motion amplitudes, The amplitude of ground motion is adjusted to 0.2g and 0.3g respectively, and the difference of structural response is found out by comparison. The failure forms of joints are divided into "strong column and weak beam" failure and "strong beam and weak column" failure, and the failure of "strong column and weak beam" is divided into four cases. According to the symmetry of the structure, the location of the nodes and the constraints, the nodes are classified, which provides the basis for the statistics of the failure forms of the next types of nodes. (2) judging the failure form of each node of the structure under each ground motion, The failure forms of each node are counted, the number of "strong beam and weak column" failure of each node is listed, the floor with relatively serious damage is judged, the floor is selected as the main research object, and the failure forms of each node of the floor are subdivided. The variation of various failure forms with the increase of bending moment magnification coefficient at the end of the column is observed. The number of column hinges is counted separately, and the variation of the number of column hinges with the magnification coefficient of bending moment at the end of column is observed, and the column end with relatively weak nodes in each layer is found out. (3) the axial force and bending moment at the end of column and beam end are counted when the end of column and beam end yield. The correlation between them is studied, and the correlation function curves of axial force and bending moment at the end of the column are given. The distribution of bending moment and axial force at Liang Zhu end is observed under the condition of "strong beam and weak column", and the direct reason why "strong column weak beam" is not realized is found out, and the correlation curve between axial force and bending moment is verified by re-establishing the model.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4
本文编号：2488336
[Abstract]:In order to prevent the collapse of RC frame structure in the process of earthquake, the researchers put forward the design concept of "strong column weak beam". The seismic code adjusts the reinforcement area at the column end by adjusting the reinforcement area at the column end to ensure the realization of the "strong column weak beam" mechanism. However, many times of earthquake damage show that a large number of RC frame structures first appear plastic hinges at the end of the column due to various reasons, forming a "strong beam and weak column" failure mechanism. The failure of the structure in earthquake occurs under dynamic load (ground motion), not the static load in design, and the seismic force specified in the code is static in nature. In the aspect of affecting the realization of "strong column and weak beam", the seismic action has a great influence on the realization of "strong column and weak beam". The failure mode of the structure under different ground motion may be completely different. Therefore, 100 ground motion are randomly selected to analyze the dynamic time history of the finite element model. A suggested method for calculating reinforcement area is given for seismic design of structures. The main work of this paper is as follows: (1) according to the load of the model and the site type, the reinforcement of the structure is calculated, and the bending moment magnification factors of nine different columns are established. Three kinds of sites are selected in the model, and 100 ground motion are randomly selected according to the shear wave velocity corresponding to the three kinds of sites in the relevant paper. in order to explore the response of the structure under the action of different ground motion amplitudes, The amplitude of ground motion is adjusted to 0.2g and 0.3g respectively, and the difference of structural response is found out by comparison. The failure forms of joints are divided into "strong column and weak beam" failure and "strong beam and weak column" failure, and the failure of "strong column and weak beam" is divided into four cases. According to the symmetry of the structure, the location of the nodes and the constraints, the nodes are classified, which provides the basis for the statistics of the failure forms of the next types of nodes. (2) judging the failure form of each node of the structure under each ground motion, The failure forms of each node are counted, the number of "strong beam and weak column" failure of each node is listed, the floor with relatively serious damage is judged, the floor is selected as the main research object, and the failure forms of each node of the floor are subdivided. The variation of various failure forms with the increase of bending moment magnification coefficient at the end of the column is observed. The number of column hinges is counted separately, and the variation of the number of column hinges with the magnification coefficient of bending moment at the end of column is observed, and the column end with relatively weak nodes in each layer is found out. (3) the axial force and bending moment at the end of column and beam end are counted when the end of column and beam end yield. The correlation between them is studied, and the correlation function curves of axial force and bending moment at the end of the column are given. The distribution of bending moment and axial force at Liang Zhu end is observed under the condition of "strong beam and weak column", and the direct reason why "strong column weak beam" is not realized is found out, and the correlation curve between axial force and bending moment is verified by re-establishing the model.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4
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