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  本文選題：鋼筋混凝土柱　切入點：擬靜力試驗　出處：《清華大學(xué)》2014年博士論文

【摘要】：鋼筋混凝土（簡稱RC）柱是建筑結(jié)構(gòu)重要的豎向構(gòu)件，對于按《建筑抗震設(shè)計規(guī)范》GB50011-2010（簡稱《抗規(guī)》）規(guī)定的柱端加密區(qū)最小配箍特征值配置箍筋的RC柱的抗震性能，我國學(xué)者已有一定的研究成果，但是，對其性能點的研究尚不充分，導(dǎo)致不能對RC柱的地震損壞狀態(tài)進行量化判別。本論文通過擬靜力試驗與數(shù)值分析，研究按《抗規(guī)》箍筋加密區(qū)最小配箍特征值配箍的RC柱的抗震性能及其性能點的轉(zhuǎn)角，為判別地震作用下RC柱的損壞程度以及RC框架結(jié)構(gòu)的抗震性能水準(zhǔn)和抗震性能目標(biāo)提供科學(xué)依據(jù)。論文主要工作及成果如下： （1）完成了9個RC柱試件的擬靜力試驗，研究不同抗震等級、柱端加密區(qū)按《抗規(guī)》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復(fù)加載次數(shù)的影響，包括RC柱的破壞形態(tài)、承載能力、變形能力、耗能能力、割線剛度等。結(jié)果表明，RC柱滯回曲線飽滿，具有很好的抗震性能。 （2）選取合適的箍筋約束混凝土本構(gòu)模型及鋼筋本構(gòu)模型，，基于OpenSEES纖維模型，計算RC柱試件在軸壓力作用下的水平力-位移滯回曲線，并轉(zhuǎn)換為彎矩-轉(zhuǎn)角滯回曲線，得到的RC柱試件彎矩-轉(zhuǎn)角骨架線特征點的轉(zhuǎn)角與試驗結(jié)果符合較好。驗證了基于OpenSEES計算RC柱彎矩-轉(zhuǎn)角滯回曲線的正確性。 （3）建議了RC柱四折線彎矩-轉(zhuǎn)角骨架線。采用OpenSEES計算得到抗震等級為一、二、三（四）級的22根RC柱在恒定軸壓力及往復(fù)水平力作用下的彎矩-轉(zhuǎn)角滯回曲線，確定了四折線骨架線特征點的塑性轉(zhuǎn)角以及RC柱性能點的塑性轉(zhuǎn)角，確定的塑性轉(zhuǎn)角與試驗結(jié)果符合較好。提出了地震作用下RC柱的損壞狀態(tài)與其彎矩-轉(zhuǎn)角骨架線特征點和性能點關(guān)系的建議，為量化判別地震作用下RC柱損壞狀態(tài)提供了依據(jù)。 （4）采用MSC.Marc2007有限元軟件，基于RC桿系結(jié)構(gòu)的纖維模型程序THUFIBER，選取3條不同地震記錄，對一個7度（0.15g）的6層RC框架結(jié)構(gòu)進行多遇地震、設(shè)防地震、罕遇地震和極罕遇地震作用下的彈性或彈塑性時程分析；根據(jù)時程分析結(jié)果以及建議的RC柱四折線彎矩-轉(zhuǎn)角骨架線，量化判別了RC柱損壞狀態(tài)，并進一步判別了RC框架結(jié)構(gòu)的抗震性能水準(zhǔn)及抗震性能目標(biāo)。
[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.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU375.3;TU352.11

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