【摘要】：再生混凝土作為一種新型環保建筑材料具有重要的社會效益和經濟效益,然而其內部骨料缺陷導致它的力學性能和常規混凝土相比存在一定的差別。鋼管再生混凝土利用鋼管對再生混凝土的約束作用彌補了再生混凝土的內在缺陷,但是目前對于鋼管再生混凝土抗震相關的研究多集中于構件層面,對于鋼管再生混凝土框架整體的研究較為鮮見。本文首先研究了再生混凝土基本性能,然后通過利用有限元軟件ABAQUS建立方鋼管再生混凝土框架結構有限元模型,來研究此類結構抗震性能。具體內容如下:(1)在已有試驗縮尺試件KJ-2的基礎上,建立了方鋼管再生混凝土框架有限元基本模型,研究了結構在反復荷載下的抗震性能,并與試驗結果作了對比,以驗證有限元方法的準確性。結果表明:有限元方法很好的模擬了結構的滯回性能、骨架曲線、剛度退化、破壞形態及受力過程;框架的塑性鉸首先在梁端產生,隨著加載的繼續進行框架柱在柱根發生屈服,且破壞時節點核心區鋼管沒有形成屈服面,滿足“強柱弱梁”的設計要求。(2)在反復荷載作用下,分別考慮鋼管再生混凝土的再生粗骨料取代率、軸壓比、鋼管內再生混凝土的強度等級、方鋼管的屈服強度及鋼管的厚度五個系列參數的變化對方鋼管再生混凝土框架抗震性能的影響。結果表明:方鋼管再生混凝土框架的滯回曲線飽滿,破壞時不同模型的等效粘滯阻尼系數均大于0.2,具有良好的耗能能力;隨著再生粗骨料取代率的提高,方鋼管再生混凝土框架模型的水平承載力及初始剛度均有所降低,但降低的程度不是特別明顯,框架的延性系數沒有隨取代率的變化表現出明顯的規律,不同取代率的框架模型位移延性計算值介于3.35~3.43之間,故設計時只需適當予以考慮;軸壓比越高,柱腳鋼管發生屈服越早,這使得方鋼管再生混凝土框架結構的水平承載力及延性退化加快,當柱子的軸壓比取0.4~0.5之間時,框架的抗震性能可以得到有效發揮;提高鋼管內再生混凝土的強度等級,有益于提高框架的承載力及初始剛度,但與此同時框架的延性及耗能能力卻出現退化,因此在實際工程中應綜合考慮來設置鋼管內再生混凝土的強度等級;隨著方鋼管鋼材屈服強度的提高,方鋼管對內填再生混凝土的約束作用增強,使得框架模型的剛度、水平承載力均有明顯提升,但框架的延性會變差,故在設計時不宜使用屈服強度過高的鋼材;柱鋼管厚度的增加可明顯提高框架的承載力及剛度,且在一定范圍內,框架的延性隨著鋼管厚度的增加而提高,當鋼管厚度超過6mm時,框架的延性又出現降低的趨勢,這說明設計時應合理設置柱鋼管的厚度。
[Abstract]:Recycled concrete as a new type of environmental protection building material has important social and economic benefits, but its internal aggregate defects lead to some differences between its mechanical properties and conventional concrete. Recycled concrete filled steel tube (CFST) makes up for the inherent defects of recycled concrete by the restriction of steel tube to recycled concrete, but the research on seismic resistance of recycled concrete filled steel tubular (CFST) is mostly focused on the component level. The whole research of recycled concrete filled steel tube frame is rare. In this paper, the basic properties of recycled concrete are studied firstly, and then the seismic behavior of this kind of structure is studied by using finite element software ABAQUS to establish the finite element model of recycled concrete filled steel tube frame structure. The main contents are as follows: (1) on the basis of KJ-2, the basic finite element model of recycled concrete filled square steel tube frame is established, and the seismic behavior of the structure under repeated load is studied, and the results are compared with the experimental results. To verify the accuracy of the finite element method. The results show that the finite element method can well simulate the hysteretic behavior of the structure, skeleton curve, stiffness degradation, failure form and stress process, and the plastic hinge of the frame is first produced at the end of the beam. As the loading continues, the frame columns yield at the root of the column, and when the failure occurs, the steel pipe in the core zone of the joint does not form a yield surface, which meets the design requirements of "strong column and weak beam". (2) under repeated loads, The replacement ratio of recycled coarse aggregate, axial compression ratio and strength grade of recycled concrete in steel tube are considered respectively. Variation of yield strength and Steel Tube thickness of Square Steel Tube the effect of seismic behavior of recycled concrete filled steel tube frame on seismic behavior is discussed. The results show that the hysteretic curve of recycled concrete filled square steel tube frame is full, and the equivalent viscous damping coefficient of different models is more than 0.2, which has good energy dissipation capacity, and with the increase of the replacement ratio of recycled coarse aggregate, the equivalent viscous damping coefficient of different models is more than 0.2. The horizontal bearing capacity and initial stiffness of square steel tube recycled concrete frame model are decreased, but the degree of reduction is not particularly obvious. The ductility coefficient of the frame does not show obvious regularity with the change of substitution rate. The calculated displacement ductility of the frame model with different replacement ratio is between 3.35 and 3.43, so it should be considered properly in design. The higher the axial compression ratio, the earlier the steel tube yield at column foot. As a result, the horizontal bearing capacity and ductility degradation of square steel tube recycled concrete frame structure are accelerated. When the axial compression ratio of column is between 0.4 and 0.5, the seismic behavior of the frame can be effectively displayed, and the strength grade of recycled concrete in steel tube can be improved. It is beneficial to improve the bearing capacity and initial stiffness of the frame, but at the same time, the ductility and the energy dissipation capacity of the frame are degraded. Therefore, the strength grade of recycled concrete in steel tube should be comprehensively considered in practical engineering. With the increase of steel yield strength of square steel tube, the restraint effect of square steel tube on reclaimed concrete is enhanced, so that the stiffness and horizontal bearing capacity of frame model are improved obviously, but the ductility of frame becomes worse. Therefore, steel with high yield strength should not be used in the design, the bearing capacity and stiffness of the frame can be obviously improved by increasing the thickness of the column steel pipe, and the ductility of the frame increases with the increase of the steel pipe thickness in a certain range. When the thickness of steel pipe exceeds 6mm, the ductility of the frame decreases again, which indicates that the thickness of column steel pipe should be reasonably set in design.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.9;TU352.11

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