【摘要】：近年來，混凝土框架-核心筒結(jié)構(gòu)廣泛應(yīng)用于高層建筑中，但國內(nèi)外對其在地震作用下的非線性性能和損傷研究較少，不能滿足發(fā)展的需求，因此，研究鋼筋混凝土框架-核心筒結(jié)構(gòu)地震破壞機(jī)理、抗震性能、地震損傷等具有重要意義。本文采用理論分析及數(shù)值模擬相結(jié)合的方法，以結(jié)構(gòu)非線性地震反應(yīng)分析為手段，從鋼筋混凝土框架-核心筒結(jié)構(gòu)變形和能量反應(yīng)研究入手，開展了以下幾個方面的研究工作： 針對目前規(guī)范中對于彎曲型結(jié)構(gòu)變形控制存在的問題，結(jié)合國內(nèi)外鋼筋混凝土結(jié)構(gòu)性能水平的劃分標(biāo)準(zhǔn)，將鋼筋混凝土框架-核心筒結(jié)構(gòu)的性能水平劃分為良好使用、繼續(xù)使用、暫時使用、中止使用和接近倒塌五個等級。針對4個地震作用水平，建立了鋼筋混凝土框架-核心筒結(jié)構(gòu)的抗震設(shè)防目標(biāo)，推導(dǎo)了針對剪力墻構(gòu)件不同性能水平下受力位移角計(jì)算公式。在統(tǒng)計(jì)分析國內(nèi)試驗(yàn)數(shù)據(jù)的基礎(chǔ)上，得出結(jié)構(gòu)及構(gòu)件受力位移角的性能指標(biāo)。分析了鋼筋混凝土框架-核心筒結(jié)構(gòu)側(cè)移模式及變形組成，將樓層位移分為受力層間位移及非受力層間位移，給出了結(jié)構(gòu)受力層間位移彈性階段解析計(jì)算方法和彈塑性階段三種簡化計(jì)算方法。在此基礎(chǔ)上，分析了結(jié)構(gòu)及構(gòu)件受力層間位移沿高度的變化規(guī)律。 通過4類場地條件下地震波時程分析，研究了彈性及彈塑性單自由度體系地震輸入能量譜，并分析了結(jié)構(gòu)參數(shù)及地震動參數(shù)的影響。研究表明，能量譜曲線可分上升段、平臺段、下降段及平滑段；結(jié)構(gòu)阻尼比比值與能量譜均值比值呈線性關(guān)系；地震波頻譜特性影響能量譜峰值平臺的長短及出現(xiàn)位置；能量譜數(shù)值與峰值加速度增大倍數(shù)的平方成正比。根據(jù)能量譜曲線的特征，建議了四段式的能量譜簡化計(jì)算公式以及曲線參數(shù)的確定方法。對于多自由度體系，，建議采用多階振型組合的方法計(jì)算總輸入能。 通過選用一定數(shù)量的地震波對9個不同結(jié)構(gòu)特性的鋼筋混凝土框架-核心筒結(jié)構(gòu)進(jìn)行時程分析，研究了此類結(jié)構(gòu)在地震作用下的總輸入能及其在滯回耗能和阻尼耗能之間的分配規(guī)律，滯回耗能與結(jié)構(gòu)動力特性以及地震動參數(shù)的關(guān)系，滯回耗能在構(gòu)件及層間的分布規(guī)律。通過參數(shù)分析及回歸擬合的方法得到能夠反映結(jié)構(gòu)剛度特征值、連梁與剪力墻線剛度比和結(jié)構(gòu)周期等因素的滯回耗能比以及滯回耗能層間分布規(guī)律的簡化計(jì)算公式。 在分析現(xiàn)有損傷模型的基礎(chǔ)上，提出了針對鋼筋混凝土框架-核心筒結(jié)構(gòu)的雙參數(shù)損傷指標(biāo)，并驗(yàn)證了損傷模型的合理性。通過推覆分析及時程分析結(jié)果，研究了結(jié)構(gòu)抗震性能及整體損傷模式，并通過參數(shù)分析研究了不同結(jié)構(gòu)參數(shù)對抗震性能以及損傷模式的影響，從而提出鋼筋混凝土框架-核心筒合理損傷模式。
[Abstract]:In recent years, the concrete frame-core tube structure has been widely used in high-rise buildings. However, there are few researches on its nonlinear behavior and damage under earthquake action at home and abroad, which can not meet the needs of development. It is of great significance to study the seismic failure mechanism, seismic performance and seismic damage of reinforced concrete frame-core tube structure. In this paper, the method of theoretical analysis and numerical simulation is used to study the deformation and energy response of reinforced concrete frame-core tube structures by means of nonlinear seismic response analysis of structures. The following research work has been carried out: aiming at the existing problems of deformation control of flexural structures in the current code, combining with the standards of the performance level of reinforced concrete structures at home and abroad, The performance level of reinforced concrete frame-core tube structure is divided into five grades: good use, continuous use, temporary use, suspension and close to collapse. The seismic fortification targets of reinforced concrete frame-core tube structures are established according to the four seismic action levels. The formulas for calculating the displacement angle of shear wall members under different performance levels are derived. On the basis of statistical analysis of domestic test data, the performance indexes of the displacement angle of the structure and the members are obtained. The lateral displacement mode and deformation composition of reinforced concrete frame-core tube structure are analyzed, and the floor displacement is divided into two parts: the stress layer displacement and the non-stress layer displacement. Three simplified calculation methods of elastic stage and elastic-plastic stage are presented. On the basis of this, the variation law of structure and member's interstory displacement along the height is analyzed. The seismic input energy spectra of elastic and elastoplastic single-degree-of-freedom systems are studied by time-history analysis of seismic waves under four kinds of site conditions, and the effects of structural parameters and ground motion parameters are analyzed. The results show that the energy spectrum curve can be divided into ascending, platform, descending and smooth segments, the ratio of structure damping ratio to the ratio of energy spectrum is linearly related to the ratio of energy spectrum to the average value of energy spectrum, and the characteristics of seismic wave spectrum affect the length and location of the peak energy spectrum platform. The value of the energy spectrum is proportional to the square of the increase of the peak acceleration. According to the characteristics of the energy spectrum curve, the simplified formula for calculating the energy spectrum and the method for determining the parameters of the curve are suggested. For multi-degree of freedom system, it is suggested that the method of multi-order mode combination be used to calculate the total input energy. By selecting a certain number of seismic waves, 9 reinforced concrete frame-core tube structures with different structural characteristics are analyzed in time history. The total input energy and its distribution between hysteretic energy dissipation and damping energy dissipation, the relationship between hysteretic energy dissipation and structural dynamic characteristics and ground motion parameters, and the distribution of hysteretic energy between members and layers are studied. By means of parameter analysis and regression fitting, a simplified formula for calculating the hysteretic energy dissipation ratio, the hysteretic energy dissipation ratio and the distribution law between layers of hysteretic energy dissipation is obtained, which can reflect the eigenvalue of structure stiffness, the ratio of linear stiffness of connecting beam to shear wall, and the structural period. Based on the analysis of the existing damage models, a two-parameter damage index for reinforced concrete frame-core tube structures is proposed, and the rationality of the damage model is verified. Based on the results of time-history analysis of nappe analysis, the aseismic performance and overall damage mode of structures are studied, and the effects of different structural parameters on seismic performance and damage modes are studied by parameter analysis. The reasonable damage mode of reinforced concrete frame-core tube is put forward.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU973.17;TU973.31

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