钢筋混凝土柱抗震性能点转角研究

发布时间：2018-03-24 06:12

本文选题：钢筋混凝土柱　切入点：拟静力试验　出处：《清华大学》2014年博士论文

【摘要】：钢筋混凝土（简称RC）柱是建筑结构重要的竖向构件，对于按《建筑抗震设计规范》GB50011-2010（简称《抗规》）规定的柱端加密区最小配箍特征值配置箍筋的RC柱的抗震性能，我国学者已有一定的研究成果，但是，对其性能点的研究尚不充分，导致不能对RC柱的地震损坏状态进行量化判别。本论文通过拟静力试验与数值分析，研究按《抗规》箍筋加密区最小配箍特征值配箍的RC柱的抗震性能及其性能点的转角，为判别地震作用下RC柱的损坏程度以及RC框架结构的抗震性能水准和抗震性能目标提供科学依据。论文主要工作及成果如下：（1）完成了9个RC柱试件的拟静力试验，研究不同抗震等级、柱端加密区按《抗规》最小配箍特征值配置箍筋的RC柱的抗震性能以及水平力往复加载次数的影响，包括RC柱的破坏形态、承载能力、变形能力、耗能能力、割线刚度等。结果表明，RC柱滞回曲线饱满，具有很好的抗震性能。（2）选取合适的箍筋约束混凝土本构模型及钢筋本构模型，，基于OpenSEES纤维模型，计算RC柱试件在轴压力作用下的水平力-位移滞回曲线，并转换为弯矩-转角滞回曲线，得到的RC柱试件弯矩-转角骨架线特征点的转角与试验结果符合较好。验证了基于OpenSEES计算RC柱弯矩-转角滞回曲线的正确性。（3）建议了RC柱四折线弯矩-转角骨架线。采用OpenSEES计算得到抗震等级为一、二、三（四）级的22根RC柱在恒定轴压力及往复水平力作用下的弯矩-转角滞回曲线，确定了四折线骨架线特征点的塑性转角以及RC柱性能点的塑性转角，确定的塑性转角与试验结果符合较好。提出了地震作用下RC柱的损坏状态与其弯矩-转角骨架线特征点和性能点关系的建议，为量化判别地震作用下RC柱损坏状态提供了依据。（4）采用MSC.Marc2007有限元软件，基于RC杆系结构的纤维模型程序THUFIBER，选取3条不同地震记录，对一个7度（0.15g）的6层RC框架结构进行多遇地震、设防地震、罕遇地震和极罕遇地震作用下的弹性或弹塑性时程分析；根据时程分析结果以及建议的RC柱四折线弯矩-转角骨架线，量化判别了RC柱损坏状态，并进一步判别了RC框架结构的抗震性能水准及抗震性能目标。
[Abstract]:Reinforced concrete (RCC) columns are important vertical members of building structures. The seismic behavior of RC columns with minimum stirrups in the infill zone of column end according to the Code for Seismic Design of buildings GB50011-2010 (referred to as "Anti-Code"), Some research achievements have been made by Chinese scholars, but the research on the performance points of RC columns is not enough, which makes it impossible to quantitatively judge the seismic damage state of RC columns. In this paper, the pseudostatic test and numerical analysis are carried out. In this paper, the seismic behavior and the angle of the performance of RC columns with stirrups in the infill zone of stirrups are studied. In order to judge the damage degree of RC columns under earthquake and the seismic performance level and target of RC frame structure, the main work and results of this paper are as follows:. 1) the pseudostatic test of 9 RC columns has been completed, and the effects of different seismic grades on the seismic behavior and the times of horizontal reciprocating loading of RC columns with stirrups in the infill zone of column end according to the minimum stirrups eigenvalue are studied. The results show that the hysteretic curves of RC columns are full and have good seismic performance. (2) choosing appropriate constitutive model of confined concrete and reinforcing bar, based on OpenSEES fiber model, the horizontal force-displacement hysteretic curve of RC column specimen under axial pressure is calculated, and converted into moment turn angle hysteretic curve. The corner angle of the bending moment-angle skeleton curve obtained from RC column is in good agreement with the experimental results. The correctness of calculating the bending moment-angle hysteretic curve of RC column based on OpenSEES is verified. The torque-rotation angle hysteretic curves of 22 RC columns with seismic grade of one, two, three (four) grades under constant axial pressure and reciprocating horizontal force are calculated by OpenSEES. The plastic rotation angle of the characteristic point of the four-fold skeleton line and the plastic rotation angle of the RC column performance point are determined. The plastic rotation angle is in good agreement with the experimental results. The relationship between the damage state of RC columns under earthquake and the characteristic points and performance points of the bending moment angle skeleton line is proposed, which provides a basis for quantifying the damage states of RC columns under earthquake action. Using MSC.Marc2007 finite element software, based on the fiber model program THUFIBERof RC bar structure, three different seismic records are selected to carry out frequent earthquake and earthquake prevention for a six-story RC frame structure with 7 degrees or 0.15g). Elastic or elastoplastic time-history analysis under rare and extremely rare earthquakes, the damage state of RC column is quantitatively determined according to the results of time-history analysis and the suggested four-line bending moment-rotation skeleton line of RC column. Furthermore, the seismic performance level and target of RC frame structure are determined.
【学位授予单位】：清华大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU375.3;TU352.11

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