本文關(guān)鍵詞： 型鋼混凝土柱 雙向擬靜力試驗 SRC框架-RC核心筒 抗震性能 能量譜 滯回耗能分布規(guī)律 合理損傷模式　出處：《西安建筑科技大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：混合結(jié)構(gòu)已成為我國高層建筑中一種主要的結(jié)構(gòu)形式,該結(jié)構(gòu)體系的優(yōu)勢在于:一方面其可有效地將鋼材、混凝土以及鋼-混凝土組合構(gòu)件進行組合,既具有鋼結(jié)構(gòu)的技術(shù)優(yōu)勢又具有混凝土造價相對低廉的特點;另一方面,混合結(jié)構(gòu)還具有剛度大、防火性好、耐久性好的優(yōu)點。可見,混合結(jié)構(gòu)是符合我國國情的高層建筑結(jié)構(gòu)體系,預(yù)計未來必將有更大發(fā)展。本文采用試驗研究及數(shù)值模擬的方法,進行了型鋼混凝土(SRC)柱抗震性能的試驗研究,并分析了SRC柱抗震性能的影響因素,在此基礎(chǔ)上,建立SRC框架-鋼筋混凝土(RC)核心筒結(jié)構(gòu)模型,考察了結(jié)構(gòu)的受力性能、滯回耗能分布規(guī)律及合理損傷模式。具體內(nèi)容如下:本次試驗共制作了2組8個型鋼混凝土柱試件,包括4個方鋼管混凝土柱和4個核心型鋼混凝土柱,兩組試件的尺寸、含鋼率等均相同。主要探討了加載路徑、配鋼形式對SRC柱的破壞形態(tài)、滯回性能、剛度退化、承載力退化、位移延性及耗能能力的影響,同時分析了不同加載路徑下SRC柱中型鋼、縱筋及箍筋的應(yīng)力水平。以試驗數(shù)據(jù)及數(shù)值模擬為基礎(chǔ),考察了軸壓比、循環(huán)次數(shù)、位移幅值增量及變軸力等影響因素對SRC柱抗震性能的影響。首先建立彈塑性單自由度(SDOF)體系,分析了場地類別、滯回模型、強化段剛度、阻尼比及地震動強度等對地震輸入能量譜的影響,并最終提出了SDOF彈塑性地震輸入能量譜計算公式,在此基礎(chǔ)上,建立滿足二維屈服面函數(shù)的單質(zhì)點雙自由度(SPDDF)體系,并進行彈塑性地震輸入能量譜計算與統(tǒng)計,分析了雙自由度體系兩主軸方向周期比對地震輸入能量譜的影響,最終提出了SPDDF地震輸入能量反應(yīng)譜計算方法。采用彈性時程分析方法考察了單、雙向地震作用下框架柱、剪力墻、框架梁及連梁等構(gòu)件內(nèi)力及結(jié)構(gòu)層間剪力、傾覆彎矩的分布規(guī)律,同時采用彈塑性時程分析方法考察了單、雙向地震作用下結(jié)構(gòu)頂點位移、頂點速度、頂點加速度及層間位移角等結(jié)構(gòu)響應(yīng)規(guī)律,得出部分結(jié)論,可供高層建筑結(jié)構(gòu)設(shè)計作參考。對SRC框架-RC核心筒結(jié)構(gòu)進行罕遇地震作用下的彈塑性時程分析,研究了結(jié)構(gòu)中各能量項的分布比例,考察了地震動特性及動力特性對結(jié)構(gòu)滯回耗能的影響,并提出了各類構(gòu)件滯回耗能比分配計算公式,同時考察了各類構(gòu)件滯回耗能沿結(jié)構(gòu)高度方向及水平方向的分布規(guī)律。選取影響SRC框架-RC核心筒結(jié)構(gòu)抗震性能的主要設(shè)計參數(shù):墻整體系數(shù)、軸向變形系數(shù)及剛度特征值,對不同結(jié)構(gòu)算例進行雙向罕遇地震作用下的彈塑性時程分析和非線性動力增量分析,研究了設(shè)計參數(shù)對框架-核心筒結(jié)構(gòu)耗能分布模式及損傷模式的影響,提出了合理損傷模式并給出了設(shè)計建議。
[Abstract]:Hybrid structure has become one of the main structural forms in high-rise buildings in China. The advantage of this structure system is that on the one hand, it can effectively combine steel, concrete and steel-concrete composite members. It not only has the technical advantage of steel structure, but also has the characteristics of relatively low cost of concrete. On the other hand, the hybrid structure also has the advantages of high stiffness, good fire resistance and good durability. It is expected that there will be more development in the future. In this paper, experimental study on seismic behavior of SRC- shaped steel reinforced concrete columns is carried out by means of experimental research and numerical simulation. Based on the analysis of the influencing factors of the seismic behavior of SRC columns, the model of SRC frame-reinforced concrete (RC) core tube structure is established, and the mechanical behavior of the structure is investigated. The main contents are as follows: in this experiment, two groups of 8 steel reinforced concrete columns were made, including 4 square steel tube concrete columns and 4 core steel reinforced concrete columns. The size and steel content of the two groups of specimens are the same. The effects of loading path, steel distribution form on the failure form, hysteretic property, stiffness degradation, bearing capacity degradation, displacement ductility and energy dissipation capacity of SRC columns are mainly discussed. At the same time, the stress levels of steel, longitudinal bars and stirrups in SRC columns under different loading paths are analyzed. Based on the experimental data and numerical simulation, the axial compression ratio and cycle times are investigated. The effect of displacement amplitude increment and variable axial force on seismic performance of SRC columns is studied. Firstly, the elastoplastic single degree of freedom (SDOF) system is established, and the site category, hysteretic model and stiffening section stiffness are analyzed. The influence of damping ratio and ground motion intensity on the energy spectrum of earthquake input is discussed. Finally, the formula for calculating the input energy spectrum of SDOF elastoplastic earthquake is proposed. A two-degree-of-freedom SPDDF system satisfying the two-dimensional yield surface function is established, and the energy spectrum of elastic-plastic seismic input is calculated and counted. The influence of the ratio of direction and period of two spindle direction to period on the seismic input energy spectrum is analyzed. Finally, the SPDDF seismic input energy response spectrum calculation method is put forward and the single seismic input energy spectrum is investigated by using the elastic time history analysis method. The internal forces of frame column, shear wall, frame beam and connecting beam, and the distribution of shear force and overturning moment of the frame column, shear wall, frame beam and connecting beam are investigated under the action of bidirectional earthquake. At the same time, the elastic-plastic time-history analysis method is used to investigate the single structure. Under the action of bidirectional earthquake, the structural response law such as vertex displacement, vertex velocity, vertex acceleration and interstory displacement angle are obtained, and some conclusions are obtained. It can be used as a reference for the design of high-rise building structure. The elastic-plastic time-history analysis of SRC frame-RC core tube structure under rare earthquake is carried out, and the distribution ratio of each energy item in the structure is studied. The effects of ground motion characteristics and dynamic characteristics on hysteretic energy dissipation of structures are investigated, and the formulas for calculating the hysteretic energy dissipation ratio of various components are proposed. At the same time, the distribution law of hysteretic energy dissipation along the direction of height and horizontal direction of structure is investigated. The main design parameter of SRC frame-RC core tube structure is selected: the integral coefficient of wall. Axial deformation coefficient and stiffness eigenvalue are analyzed by elastic-plastic time-history analysis and nonlinear dynamic increment analysis for different structural examples under the action of bidirectional rare earthquake. The influence of design parameters on the energy dissipation distribution mode and damage mode of frame-core tube structure is studied. The reasonable damage mode is put forward and the design suggestions are given.
【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】：2015
【分類號】：TU973.31

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