基于性能抗震設(shè)計的鋼筋混凝土柱試驗研究
發(fā)布時間：2019-03-09 10:04
【摘要】：基于性能的抗震設(shè)計對于結(jié)構(gòu)構(gòu)件的能力需求不僅僅局限在極限承載力和彈性變形能力上，同時對結(jié)構(gòu)構(gòu)件延性變形、滯回耗能等抗震性能也有了明確的需求。根據(jù)性能設(shè)計要求進行結(jié)構(gòu)構(gòu)件設(shè)計，需要建立構(gòu)件基本參數(shù)與抗震性能之間的數(shù)值關(guān)系。 本文從國內(nèi)外規(guī)范、試驗研究、數(shù)值分析多個方面對鋼筋混凝土柱截面延性、位移延性和塑性鉸長度等抗震性能參數(shù)的影響因素、計算方法和統(tǒng)計概率分布等進行了分析與研究，其主要內(nèi)容如下： 1.配箍率作為影響鋼筋混凝土柱延性的一個主要參數(shù)，已經(jīng)受到國內(nèi)外學(xué)者和結(jié)構(gòu)設(shè)計規(guī)范的關(guān)注。本文介紹了國內(nèi)外主要規(guī)范對于鋼筋混凝土柱最小配箍率的相關(guān)規(guī)定。計算對比了各國規(guī)范中最小配箍率對截面延性的影響。討論了我國規(guī)范按照最小配箍率所能獲得的柱截面延性，并對最小配箍率的設(shè)置提出了建議。 2.本文設(shè)計了4根鋼筋混凝土懸臂柱，并對其進行了低周反復(fù)荷載試驗。試驗中主要測試內(nèi)容是柱頂位移、箍筋應(yīng)變。試驗獲得了在壓彎作用下箍筋應(yīng)變分布和變化情況，為柱截面混凝土所承受的約束應(yīng)力計算提供了試驗數(shù)據(jù)支持。同時通過變化軸壓比、加載方式，討論了這兩個因素對柱抗震性能的影響。試驗結(jié)果表明軸壓比和加載方式對于柱破壞形態(tài)、箍筋應(yīng)變分布影響顯著�？偨Y(jié)了箍筋應(yīng)變在柱截面內(nèi)沿環(huán)向分布規(guī)律和沿柱高度方向的變化規(guī)律。 3.對試驗獲得的箍筋應(yīng)變數(shù)據(jù)進行整理分析，導(dǎo)入鋼筋應(yīng)力-應(yīng)變?nèi)�，通過分析得到了柱試驗過程箍筋應(yīng)力分布和變化數(shù)據(jù)。從而得到箍筋約束的柱截面混凝土受到的約束力分布情況。根據(jù)Mander的約束理論，計算出有效約束系數(shù)，可以得到箍筋間弱約束截面的約束應(yīng)力分布情況。通過引入混凝土膨脹參數(shù)，對約束應(yīng)力進行計算，從而改進計算柱截面延性的纖維模型。利用改進的纖維模型，對影響截面曲率延性的各個參數(shù)進行了分析，并通過回歸分析建立了截面曲率延性與配箍特征值、軸壓比、縱向配筋率和核心混凝土面積比之間的關(guān)系。與其他基于性能的截面延性設(shè)計方法計算結(jié)果相比，，本文建議的方法準確度相對較高，能較好反映曲率延性系數(shù)的變化規(guī)律。 4.位移延性作為最基本的構(gòu)件抗震性能指標，有眾多的影響參數(shù)。按照Priestly的計算方法，可以采用兩個主要參數(shù)來計算柱位移延性，分別是截面延性和塑性鉸長度。本文從美國太平洋地震研究中心提供的柱試驗數(shù)據(jù)中選取了143個滯回曲線完整且破壞形態(tài)為彎曲破壞的柱試驗數(shù)據(jù)，通過計算分析得到柱等效塑性鉸長度。再通過回歸分析，獲得了等效塑性鉸長度的計算公式。經(jīng)試驗結(jié)果的驗證，本文建議的公式具有較高的計算精度。本文收集了國內(nèi)45個混凝土柱的抗震試驗結(jié)果對本文建議的方法進行檢驗，結(jié)果表明采用本文建議的方法計算得到的位移延性均值與試驗結(jié)果的均值基本一致，其誤差基本能保證在20％以內(nèi)，相對誤差呈正態(tài)分布。 5.基于性能的抗震設(shè)防理念必然和不同地震作用下結(jié)構(gòu)抗震性能指標相聯(lián)系。而位移是最為直觀的指標之一。通過對直接基于位移的抗震設(shè)計方法和基于性能的多目標抗震思想的研究，本文提出了基于位移的多水準抗震設(shè)計方法。這一設(shè)計方法首先根據(jù)業(yè)主的要求確定不同烈度地震作用下對結(jié)構(gòu)位移性能的預(yù)期與需求。通過位移需求構(gòu)造需求曲線，而結(jié)構(gòu)的抗震性能將按照這一曲線，采用改進的直接基于位移的能力譜方法進行設(shè)計。采用一個單自由度橋墩的設(shè)計過程介紹了基于位移的多水準設(shè)計方法的設(shè)計流程。
[Abstract]:The performance-based seismic design is not only limited to the ultimate bearing capacity and the elastic deformation capacity, but also has a clear demand for the seismic performance of the structural members, such as the ductility deformation, the hysteretic energy dissipation and the like. According to the performance design requirements, the structural component design is carried out, and the numerical relation between the basic parameters of the component and the anti-seismic performance needs to be established. In this paper, the influence factors, the calculation method and the statistical probability distribution of the seismic performance parameters such as the section ductility, the displacement ductility and the plastic hinge length of the reinforced concrete column are analyzed and studied from the aspects of the domestic and foreign specifications, the test and the numerical analysis. The main contents of this paper are as follows: "Next:1. The stirrup ratio is a main parameter which influences the ductility of reinforced concrete column, and has been subjected to domestic and foreign scholars and structural design specifications." The paper introduces the phase of the minimum stirrup ratio for reinforced concrete columns at home and abroad. The cross-sectional ductility is calculated and compared with the minimum coupling ratio in national specifications. The influence of the criterion on the ductility of the column in accordance with the minimum stirrup ratio and the setting of the minimum stirrup ratio are discussed. In this paper, four reinforced concrete cantilever columns are designed, and it has been carried out for a low cycle. Complex load test. The main test contents in the test are the column top displacement And the strain distribution and the variation of the stirrup under the bending action are obtained, and a test is provided for the constraint stress calculation under the column section concrete. The data support of the column is also discussed through the change of the axial compression ratio and the loading mode, and the two factors are discussed. The experimental results show that the axial compression ratio and the loading method are different to the column failure mode and the hoop strain. The distribution of the hoop strain in the section of the column and the height direction of the column are summarized. 3. The strain data of the stirrups obtained by the test are analyzed and analyzed, and the stress-strain full curve of the steel bar is introduced, and the stress of the stirrups during the column test is obtained through the analysis. Distribution and variation of data to obtain a column section of concrete that is restrained by the stirrups. According to the constraint theory of the Mander, the effective constraint coefficient can be calculated, and the weak constraint cross-section between the stirrups can be obtained. In that case of stress distribution of the beam, the constraint stress is calculated by introduce the expansion parameter of the concrete, so as to improve the section of the calculation column. In this paper, a modified fiber model is used to analyze the various parameters which influence the ductility of the section curvature, and the ductility of the section curvature and the characteristic value of the hoop, the axial compression ratio, the longitudinal reinforcement ratio and the core concrete surface are established by the regression analysis. The accuracy of the proposed method is relatively high, which can reflect the curvature ductility better than the other performance-based design method of the cross-section ductility design. the variation rule of the coefficient.4. The displacement ductility is the most basic seismic performance index of the component There are many influence parameters. According to Priestly's calculation method, two main parameters can be used to calculate the displacement ductility of the column, respectively. In this paper, the column test data of 143 hysteretic curves are selected from the column test data provided by the Pacific Seismic Research Center of the United States, and the column test data in the form of bending and failure are selected by calculation and analysis. The equivalent plastic hinge length to the column is obtained. The equivalent plastic is obtained by the regression analysis. The calculation formula of the length of the sex hinge. The formula of this paper is verified by the verification of the test results. The results of the anti-seismic test of 45 concrete columns in China are tested. The results show that the mean value of the displacement ductility obtained by the method proposed in this paper is basically the same as that of the test results, and the error is basically the same as that of the test results. can be ensured to be within 20 percent, The relative error is a normal distribution.5. The anti-seismic fortification concept based on the performance must be under the effect of different earthquakes It is related to the seismic performance index of the structure. Moving is one of the most intuitive indexes. Based on the research of the anti-seismic design method based on displacement and the multi-objective anti-seismic idea based on performance, this paper puts forward the position based on bit The design method of the multi-level anti-seismic design is based on the owner's request to determine the alignment of the different intensity seismic action. The expected and demand of the structure displacement performance. The demand curve is constructed by the displacement demand, and the seismic performance of the structure will be based on this curve, and the improved direct-based position is adopted. The method of the capability spectrum of a single-degree-of-freedom pier is used to design a single-degree-of-freedom pier.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU375.3;TU352.11
[Abstract]:The performance-based seismic design is not only limited to the ultimate bearing capacity and the elastic deformation capacity, but also has a clear demand for the seismic performance of the structural members, such as the ductility deformation, the hysteretic energy dissipation and the like. According to the performance design requirements, the structural component design is carried out, and the numerical relation between the basic parameters of the component and the anti-seismic performance needs to be established. In this paper, the influence factors, the calculation method and the statistical probability distribution of the seismic performance parameters such as the section ductility, the displacement ductility and the plastic hinge length of the reinforced concrete column are analyzed and studied from the aspects of the domestic and foreign specifications, the test and the numerical analysis. The main contents of this paper are as follows: "Next:1. The stirrup ratio is a main parameter which influences the ductility of reinforced concrete column, and has been subjected to domestic and foreign scholars and structural design specifications." The paper introduces the phase of the minimum stirrup ratio for reinforced concrete columns at home and abroad. The cross-sectional ductility is calculated and compared with the minimum coupling ratio in national specifications. The influence of the criterion on the ductility of the column in accordance with the minimum stirrup ratio and the setting of the minimum stirrup ratio are discussed. In this paper, four reinforced concrete cantilever columns are designed, and it has been carried out for a low cycle. Complex load test. The main test contents in the test are the column top displacement And the strain distribution and the variation of the stirrup under the bending action are obtained, and a test is provided for the constraint stress calculation under the column section concrete. The data support of the column is also discussed through the change of the axial compression ratio and the loading mode, and the two factors are discussed. The experimental results show that the axial compression ratio and the loading method are different to the column failure mode and the hoop strain. The distribution of the hoop strain in the section of the column and the height direction of the column are summarized. 3. The strain data of the stirrups obtained by the test are analyzed and analyzed, and the stress-strain full curve of the steel bar is introduced, and the stress of the stirrups during the column test is obtained through the analysis. Distribution and variation of data to obtain a column section of concrete that is restrained by the stirrups. According to the constraint theory of the Mander, the effective constraint coefficient can be calculated, and the weak constraint cross-section between the stirrups can be obtained. In that case of stress distribution of the beam, the constraint stress is calculated by introduce the expansion parameter of the concrete, so as to improve the section of the calculation column. In this paper, a modified fiber model is used to analyze the various parameters which influence the ductility of the section curvature, and the ductility of the section curvature and the characteristic value of the hoop, the axial compression ratio, the longitudinal reinforcement ratio and the core concrete surface are established by the regression analysis. The accuracy of the proposed method is relatively high, which can reflect the curvature ductility better than the other performance-based design method of the cross-section ductility design. the variation rule of the coefficient.4. The displacement ductility is the most basic seismic performance index of the component There are many influence parameters. According to Priestly's calculation method, two main parameters can be used to calculate the displacement ductility of the column, respectively. In this paper, the column test data of 143 hysteretic curves are selected from the column test data provided by the Pacific Seismic Research Center of the United States, and the column test data in the form of bending and failure are selected by calculation and analysis. The equivalent plastic hinge length to the column is obtained. The equivalent plastic is obtained by the regression analysis. The calculation formula of the length of the sex hinge. The formula of this paper is verified by the verification of the test results. The results of the anti-seismic test of 45 concrete columns in China are tested. The results show that the mean value of the displacement ductility obtained by the method proposed in this paper is basically the same as that of the test results, and the error is basically the same as that of the test results. can be ensured to be within 20 percent, The relative error is a normal distribution.5. The anti-seismic fortification concept based on the performance must be under the effect of different earthquakes It is related to the seismic performance index of the structure. Moving is one of the most intuitive indexes. Based on the research of the anti-seismic design method based on displacement and the multi-objective anti-seismic idea based on performance, this paper puts forward the position based on bit The design method of the multi-level anti-seismic design is based on the owner's request to determine the alignment of the different intensity seismic action. The expected and demand of the structure displacement performance. The demand curve is constructed by the displacement demand, and the seismic performance of the structure will be based on this curve, and the improved direct-based position is adopted. The method of the capability spectrum of a single-degree-of-freedom pier is used to design a single-degree-of-freedom pier.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU375.3;TU352.11
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