【摘要】：型鋼再生混凝土組合結構融合了再生混凝土節(jié)能環(huán)保、可再生利用的顯著特點和普通型鋼混凝土結構承載能力高、抗震性能好的優(yōu)點，不但可以提高建筑結構的抗震防災能力，還符合國家綠色環(huán)保和可持續(xù)發(fā)展的戰(zhàn)略，因此具有廣闊的發(fā)展應用前景。課題組前期已經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)點及框架結構的抗震性能，本文對此開展了系統(tǒng)的研究。研究工作內容主要包括以下四個方面： （1）型鋼再生混凝土梁柱節(jié)點抗震性能試驗研究與理論分析。通過對4個縮尺比為1：2.5的節(jié)點試件的低周反復荷載試驗，研究了型鋼再生混凝土梁柱節(jié)點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特性；分析了型鋼再生混凝土梁柱節(jié)點在水平荷載作用下的受力機理。結果表明：型鋼再生混凝土梁柱節(jié)點延性好，變形能力強，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)點構件受力機理特征，給出了型鋼再生混凝土梁柱節(jié)點抗剪承載力的實用計算公式。 （2）型鋼再生混凝土框架結構抗震性能試驗研究與理論分析。設計了1榀縮尺比為1：2.5兩跨三層的型鋼再生混凝土框架結構模型。通過對其進行擬動力試驗，研究其在預估地震作用下的加速度反應、位移反應、滯回特性、剛度和耗能性能。研究結果表明：型鋼再生混凝土框架結構延性相對較好，具有較強的塑性變形能力。模型結構在三種地震波(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現(xiàn)行規(guī)范要求。型鋼再生混凝土框架結構體系可滿足8度設防要求，具有良好抗震性能。在擬動力試驗結束后，又對該榀框架結構進行了擬靜力試驗，觀察了框架的破壞過程和破壞形態(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。結果表明：型鋼再生混凝土框架結構的破壞屬于“強柱弱梁、強節(jié)點弱構件”的破壞機制；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；破壞時試件的最大位移角為1/22，正負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，適合高烈度抗震設防區(qū)采用。模型結構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)點及框架結構抗震性能的非線性有限元分析�；谛弯摶炷两Y構的受力特點，建立了適用于反復荷載作用下型鋼混凝土材料的本構關系。在上述試驗研究的基礎上，考慮材料非線性、幾何非線性和剛度退化等因素的影響，分析了在低周反復荷載作用下型鋼再生混凝土梁柱節(jié)點的受力性能和結構的滯回特性。分析結果與模型試驗結果相比較，二者吻合較好。 采用有限元程序OpenSees對型鋼再生混凝土框架進行了滯回性能分析，對框架的滯回性能進行了P-Δ效應、軸壓比、再生混凝土強度、型鋼強度等參數(shù)影響分析�？蚣茉诘椭芊磸秃奢d作用下有限元計算結果與試驗結果吻合較好，OpenSees有限元軟件可應用于該新型框架結構中。P-Δ效應對框架彈性階段的滯回性能影響較��；隨著軸壓比的增大，框架骨架曲線的下降段越來越陡，表明框架的水平承載力下降速率越來越快，延性也越來越差；隨著再生混凝土強度的提高，型鋼再生混凝土框架的抗側剛度略有增大，水平承載力也有所提高，但耗能能力略微有所降低，再生混凝土強度對框架抗震延性的影響不明顯；增大型鋼強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）參照國內外相關規(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、暫時使用、生命安全和接近倒塌四檔，并結合三個地震設防水準，給出了型鋼再生混凝土框架的抗震性能最高目標、重要目標和基本目標。在型鋼再生混凝土框架抗震性能試驗研究的基礎上，提出了型鋼再生混凝土框架對應四個性能水平的層間位移角限值。 將基于位移的抗震設計理論應用于型鋼再生混凝土框架，結合其結構特點給出了設計步驟，并以8層框架為例，具體說明了設計過程。同時，通過總結分析給出了型鋼再生混凝土框架的構件截面設計方法。
[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.
【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU398.9;TU352.11

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