【摘要】：型鋼再生混凝土組合結(jié)構(gòu)融合了再生混凝土節(jié)能環(huán)保、可再生利用的顯著特點(diǎn)和普通型鋼混凝土結(jié)構(gòu)承載能力高、抗震性能好的優(yōu)點(diǎn)，不但可以提高建筑結(jié)構(gòu)的抗震防災(zāi)能力，還符合國(guó)家綠色環(huán)保和可持續(xù)發(fā)展的戰(zhàn)略，因此具有廣闊的發(fā)展應(yīng)用前景。課題組前期已經(jīng)研究了型鋼再生混凝土梁、柱的受力性能，為了揭示型鋼再生混凝土梁柱節(jié)點(diǎn)及框架結(jié)構(gòu)的抗震性能，本文對(duì)此開(kāi)展了系統(tǒng)的研究。研究工作內(nèi)容主要包括以下四個(gè)方面： （1）型鋼再生混凝土梁柱節(jié)點(diǎn)抗震性能試驗(yàn)研究與理論分析。通過(guò)對(duì)4個(gè)縮尺比為1：2.5的節(jié)點(diǎn)試件的低周反復(fù)荷載試驗(yàn)，研究了型鋼再生混凝土梁柱節(jié)點(diǎn)在水平地震作用下的承載能力、變形能力、剛度退化、延性及耗能能力等力學(xué)特性；分析了型鋼再生混凝土梁柱節(jié)點(diǎn)在水平荷載作用下的受力機(jī)理。結(jié)果表明：型鋼再生混凝土梁柱節(jié)點(diǎn)延性好，變形能力強(qiáng)，耗能能力高，具有良好的抗震性能。依據(jù)發(fā)生不同破壞形態(tài)的節(jié)點(diǎn)構(gòu)件受力機(jī)理特征，給出了型鋼再生混凝土梁柱節(jié)點(diǎn)抗剪承載力的實(shí)用計(jì)算公式。 （2）型鋼再生混凝土框架結(jié)構(gòu)抗震性能試驗(yàn)研究與理論分析。設(shè)計(jì)了1榀縮尺比為1：2.5兩跨三層的型鋼再生混凝土框架結(jié)構(gòu)模型。通過(guò)對(duì)其進(jìn)行擬動(dòng)力試驗(yàn)，研究其在預(yù)估地震作用下的加速度反應(yīng)、位移反應(yīng)、滯回特性、剛度和耗能性能。研究結(jié)果表明：型鋼再生混凝土框架結(jié)構(gòu)延性相對(duì)較好，具有較強(qiáng)的塑性變形能力。模型結(jié)構(gòu)在三種地震波(El Centro波、Taft波、蘭州人工波)的多遇地震以及Taft波的罕遇地震作用下，，層間位移角均滿足我國(guó)現(xiàn)行規(guī)范要求。型鋼再生混凝土框架結(jié)構(gòu)體系可滿足8度設(shè)防要求，具有良好抗震性能。在擬動(dòng)力試驗(yàn)結(jié)束后，又對(duì)該榀框架結(jié)構(gòu)進(jìn)行了擬靜力試驗(yàn)，觀察了框架的破壞過(guò)程和破壞形態(tài)，獲得了框架的滯回曲線、骨架曲線，分析了框架的承載能力、剛度、延性、耗能能力、剛度退化等抗震性能。結(jié)果表明：型鋼再生混凝土框架結(jié)構(gòu)的破壞屬于“強(qiáng)柱弱梁、強(qiáng)節(jié)點(diǎn)弱構(gòu)件”的破壞機(jī)制；框架的荷載-位移滯回曲線呈飽滿的梭形，具有較好的耗能能力；破壞時(shí)試件的最大位移角為1/22，正負(fù)向平均位移延性系數(shù)為4.3，表現(xiàn)出了較好的變形能力和抗倒塌能力，適合高烈度抗震設(shè)防區(qū)采用。模型結(jié)構(gòu)的層間位移角在底層和第二層較大，為薄弱層。 （3）型鋼再生混凝土梁柱節(jié)點(diǎn)及框架結(jié)構(gòu)抗震性能的非線性有限元分析。基于型鋼混凝土結(jié)構(gòu)的受力特點(diǎn)，建立了適用于反復(fù)荷載作用下型鋼混凝土材料的本構(gòu)關(guān)系。在上述試驗(yàn)研究的基礎(chǔ)上，考慮材料非線性、幾何非線性和剛度退化等因素的影響，分析了在低周反復(fù)荷載作用下型鋼再生混凝土梁柱節(jié)點(diǎn)的受力性能和結(jié)構(gòu)的滯回特性。分析結(jié)果與模型試驗(yàn)結(jié)果相比較，二者吻合較好。 采用有限元程序OpenSees對(duì)型鋼再生混凝土框架進(jìn)行了滯回性能分析，對(duì)框架的滯回性能進(jìn)行了P-Δ效應(yīng)、軸壓比、再生混凝土強(qiáng)度、型鋼強(qiáng)度等參數(shù)影響分析�？蚣茉诘椭芊磸�(fù)荷載作用下有限元計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合較好，OpenSees有限元軟件可應(yīng)用于該新型框架結(jié)構(gòu)中。P-Δ效應(yīng)對(duì)框架彈性階段的滯回性能影響較小；隨著軸壓比的增大，框架骨架曲線的下降段越來(lái)越陡，表明框架的水平承載力下降速率越來(lái)越快，延性也越來(lái)越差；隨著再生混凝土強(qiáng)度的提高，型鋼再生混凝土框架的抗側(cè)剛度略有增大，水平承載力也有所提高，但耗能能力略微有所降低，再生混凝土強(qiáng)度對(duì)框架抗震延性的影響不明顯；增大型鋼強(qiáng)度可使得框架的水平承載力得到較為明顯的提高，但抗震延性和耗能能力變差。 （4）參照國(guó)內(nèi)外相關(guān)規(guī)范，將型鋼再生混凝土框架的抗震性能水平劃分為正常使用、暫時(shí)使用、生命安全和接近倒塌四檔，并結(jié)合三個(gè)地震設(shè)防水準(zhǔn)，給出了型鋼再生混凝土框架的抗震性能最高目標(biāo)、重要目標(biāo)和基本目標(biāo)。在型鋼再生混凝土框架抗震性能試驗(yàn)研究的基礎(chǔ)上，提出了型鋼再生混凝土框架對(duì)應(yīng)四個(gè)性能水平的層間位移角限值。 將基于位移的抗震設(shè)計(jì)理論應(yīng)用于型鋼再生混凝土框架，結(jié)合其結(jié)構(gòu)特點(diǎn)給出了設(shè)計(jì)步驟，并以8層框架為例，具體說(shuō)明了設(shè)計(jì)過(guò)程。同時(shí)，通過(guò)總結(jié)分析給出了型鋼再生混凝土框架的構(gòu)件截面設(shè)計(jì)方法。
[Abstract]:The composite structure of steel reinforced recycled concrete combines the remarkable characteristics of energy-saving and environmental protection of recycled concrete and the advantages of high bearing capacity and good seismic performance of ordinary steel reinforced concrete structure. It can not only improve the anti-seismic and disaster-prevention capability of building structure, but also conform to the national strategy of green environmental protection and sustainable development. In order to reveal the seismic behavior of SRC beam-column joints and frame structures, a systematic study has been carried out in this paper.
(1) Experimental study and theoretical analysis on seismic behavior of SRC beam-column joints. The load-carrying capacity, deformation capacity, stiffness degradation, ductility and energy dissipation capacity of SRC beam-column joints subjected to horizontal earthquake are studied by low-cyclic loading tests on four specimens with a scale of 1:2.5. The mechanical mechanism of SRC beam-column joints subjected to horizontal loads is analyzed.The results show that SRC beam-column joints have good ductility,deformation capacity,energy dissipation capacity and seismic performance.According to the mechanical characteristics of the joint members with different failure modes,the SRC beam is given. A practical formula for calculating the shear capacity of column joints.
(2) Experimental study and theoretical analysis on seismic performance of SRC frame structures. A SRC frame structure model with a scale ratio of 1:2.5 is designed. The acceleration response, displacement response, hysteretic characteristics, stiffness and energy dissipation performance of SRC frame structures are studied by pseudo-dynamic tests. The results show that the SRC frame structure has relatively good ductility and strong plastic deformation ability. The displacement angle of the model structure under three kinds of earthquake waves (El Centro wave, Taft wave, Lanzhou artificial wave) and rare earthquake of Taft wave can meet the requirements of the current code of our country. After the quasi-dynamic test, the quasi-static test of the frame structure was carried out. The failure process and failure mode of the frame were observed. The hysteretic curve and skeleton curve of the frame were obtained. The load-carrying capacity, stiffness, ductility, energy dissipation capacity and rigidity of the frame were analyzed. The results show that the failure mechanism of SRC frame structure is "strong column and weak beam, strong node and weak member"; the load-displacement hysteresis curve of the frame is full shuttle shape and has good energy dissipation capacity; the maximum displacement angle of the specimens is 1/22, and the average displacement ductility system is positive and negative. The number is 4.3, showing good deformation and collapse resistance, suitable for high-intensity seismic fortification area. The displacement angle between the layers of the model structure is larger in the bottom and the second layers, which is the weak layer.
(3) Nonlinear Finite Element Analysis of Seismic Behavior of SRC Beam-Column Joints and Frame Structures. Based on the stress characteristics of SRC structures, the constitutive relation of SRC materials under repeated loading is established. On the basis of the above experimental study, the material nonlinearity, geometric nonlinearity and stiffness degradation are considered. The mechanical behavior and hysteretic behavior of SRC beam-column joints subjected to cyclic loading are analyzed. The results are in good agreement with the model test results.
The finite element program OpenSees is used to analyze the hysteretic behavior of the SRC frame. The P-_effect, axial compression ratio, strength of recycled concrete, strength of steel and other parameters of the frame are analyzed. The software can be used in this new type of frame structure. The P-_effect has little effect on the hysteretic behavior of the frame in elastic stage; with the increase of axial compression ratio, the descending section of the frame skeleton curve becomes steeper and steeper, which indicates that the descending rate of the horizontal bearing capacity of the frame is faster and faster, and the ductility is worse and worse; with the increase of the strength of recycled concrete, the section steel is again. The lateral stiffness of RC frame increases slightly and the horizontal bearing capacity increases slightly, but the energy dissipation capacity decreases slightly. The influence of recycled concrete strength on the seismic ductility of RC frame is not obvious. The horizontal bearing capacity of RC frame can be improved obviously by increasing the strength of section steel, but the seismic ductility and energy dissipation capacity become worse.
(4) Referring to relevant codes at home and abroad, the seismic performance level of SRC frame is divided into normal use, temporary use, life safety and close to collapse. Combined with three seismic waterproofing standards, the highest seismic performance target, important target and basic target of SRC frame are given. On the basis of experimental study on seismic performance of soil frame, the limit values of story displacement angles corresponding to four performance levels of SRC frame are proposed.
The displacement-based seismic design theory is applied to the SRC frame, and the design steps are given in combination with its structural characteristics. The design process is illustrated by taking an eight-story frame as an example.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU398.9;TU352.11

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