型钢再生混凝土框架抗震性能及设计方法研究
发布时间：2018-08-15 16:43
【摘要】：型钢再生混凝土组合结构融合了再生混凝土节能环保、可再生利用的显著特点和普通型钢混凝土结构承载能力高、抗震性能好的优点，不但可以提高建筑结构的抗震防灾能力，还符合国家绿色环保和可持续发展的战略，因此具有广阔的发展应用前景。课题组前期已经研究了型钢再生混凝土梁、柱的受力性能，为了揭示型钢再生混凝土梁柱节点及框架结构的抗震性能，本文对此开展了系统的研究。研究工作内容主要包括以下四个方面： （1）型钢再生混凝土梁柱节点抗震性能试验研究与理论分析。通过对4个缩尺比为1：2.5的节点试件的低周反复荷载试验，研究了型钢再生混凝土梁柱节点在水平地震作用下的承载能力、变形能力、刚度退化、延性及耗能能力等力学特性；分析了型钢再生混凝土梁柱节点在水平荷载作用下的受力机理。结果表明：型钢再生混凝土梁柱节点延性好，变形能力强，耗能能力高，具有良好的抗震性能。依据发生不同破坏形态的节点构件受力机理特征，给出了型钢再生混凝土梁柱节点抗剪承载力的实用计算公式。 （2）型钢再生混凝土框架结构抗震性能试验研究与理论分析。设计了1榀缩尺比为1：2.5两跨三层的型钢再生混凝土框架结构模型。通过对其进行拟动力试验，研究其在预估地震作用下的加速度反应、位移反应、滞回特性、刚度和耗能性能。研究结果表明：型钢再生混凝土框架结构延性相对较好，具有较强的塑性变形能力。模型结构在三种地震波(El Centro波、Taft波、兰州人工波)的多遇地震以及Taft波的罕遇地震作用下，，层间位移角均满足我国现行规范要求。型钢再生混凝土框架结构体系可满足8度设防要求，具有良好抗震性能。在拟动力试验结束后，又对该榀框架结构进行了拟静力试验，观察了框架的破坏过程和破坏形态，获得了框架的滞回曲线、骨架曲线，分析了框架的承载能力、刚度、延性、耗能能力、刚度退化等抗震性能。结果表明：型钢再生混凝土框架结构的破坏属于“强柱弱梁、强节点弱构件”的破坏机制；框架的荷载-位移滞回曲线呈饱满的梭形，具有较好的耗能能力；破坏时试件的最大位移角为1/22，正负向平均位移延性系数为4.3，表现出了较好的变形能力和抗倒塌能力，适合高烈度抗震设防区采用。模型结构的层间位移角在底层和第二层较大，为薄弱层。 （3）型钢再生混凝土梁柱节点及框架结构抗震性能的非线性有限元分析。基于型钢混凝土结构的受力特点，建立了适用于反复荷载作用下型钢混凝土材料的本构关系。在上述试验研究的基础上，考虑材料非线性、几何非线性和刚度退化等因素的影响，分析了在低周反复荷载作用下型钢再生混凝土梁柱节点的受力性能和结构的滞回特性。分析结果与模型试验结果相比较，二者吻合较好。 采用有限元程序OpenSees对型钢再生混凝土框架进行了滞回性能分析，对框架的滞回性能进行了P-Δ效应、轴压比、再生混凝土强度、型钢强度等参数影响分析。框架在低周反复荷载作用下有限元计算结果与试验结果吻合较好，OpenSees有限元软件可应用于该新型框架结构中。P-Δ效应对框架弹性阶段的滞回性能影响较小；随着轴压比的增大，框架骨架曲线的下降段越来越陡，表明框架的水平承载力下降速率越来越快，延性也越来越差；随着再生混凝土强度的提高，型钢再生混凝土框架的抗侧刚度略有增大，水平承载力也有所提高，但耗能能力略微有所降低，再生混凝土强度对框架抗震延性的影响不明显；增大型钢强度可使得框架的水平承载力得到较为明显的提高，但抗震延性和耗能能力变差。 （4）参照国内外相关规范，将型钢再生混凝土框架的抗震性能水平划分为正常使用、暂时使用、生命安全和接近倒塌四档，并结合三个地震设防水准，给出了型钢再生混凝土框架的抗震性能最高目标、重要目标和基本目标。在型钢再生混凝土框架抗震性能试验研究的基础上，提出了型钢再生混凝土框架对应四个性能水平的层间位移角限值。 将基于位移的抗震设计理论应用于型钢再生混凝土框架，结合其结构特点给出了设计步骤，并以8层框架为例，具体说明了设计过程。同时，通过总结分析给出了型钢再生混凝土框架的构件截面设计方法。
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9;TU352.11
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9;TU352.11
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