方鋼管再生混凝土框架結(jié)構(gòu)的抗震性能研究
發(fā)布時(shí)間：2018-10-12 07:47
【摘要】：再生混凝土作為一種新型環(huán)保建筑材料具有重要的社會(huì)效益和經(jīng)濟(jì)效益,然而其內(nèi)部骨料缺陷導(dǎo)致它的力學(xué)性能和常規(guī)混凝土相比存在一定的差別。鋼管再生混凝土利用鋼管對(duì)再生混凝土的約束作用彌補(bǔ)了再生混凝土的內(nèi)在缺陷,但是目前對(duì)于鋼管再生混凝土抗震相關(guān)的研究多集中于構(gòu)件層面,對(duì)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(guò)利用有限元軟件ABAQUS建立方鋼管再生混凝土框架結(jié)構(gòu)有限元模型,來(lái)研究此類結(jié)構(gòu)抗震性能。具體內(nèi)容如下:(1)在已有試驗(yàn)縮尺試件KJ-2的基礎(chǔ)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(jié)構(gòu)在反復(fù)荷載下的抗震性能,并與試驗(yàn)結(jié)果作了對(duì)比,以驗(yàn)證有限元方法的準(zhǔn)確性。結(jié)果表明:有限元方法很好的模擬了結(jié)構(gòu)的滯回性能、骨架曲線、剛度退化、破壞形態(tài)及受力過(guò)程;框架的塑性鉸首先在梁端產(chǎn)生,隨著加載的繼續(xù)進(jìn)行框架柱在柱根發(fā)生屈服,且破壞時(shí)節(jié)點(diǎn)核心區(qū)鋼管沒(méi)有形成屈服面,滿足“強(qiáng)柱弱梁”的設(shè)計(jì)要求。(2)在反復(fù)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(nèi)再生混凝土的強(qiáng)度等級(jí)、方鋼管的屈服強(qiáng)度及鋼管的厚度五個(gè)系列參數(shù)的變化對(duì)方鋼管再生混凝土框架抗震性能的影響。結(jié)果表明:方鋼管再生混凝土框架的滯回曲線飽滿,破壞時(shí)不同模型的等效粘滯阻尼系數(shù)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(shù)沒(méi)有隨取代率的變化表現(xiàn)出明顯的規(guī)律,不同取代率的框架模型位移延性計(jì)算值介于3.35~3.43之間,故設(shè)計(jì)時(shí)只需適當(dāng)予以考慮;軸壓比越高,柱腳鋼管發(fā)生屈服越早,這使得方鋼管再生混凝土框架結(jié)構(gòu)的水平承載力及延性退化加快,當(dāng)柱子的軸壓比取0.4~0.5之間時(shí),框架的抗震性能可以得到有效發(fā)揮;提高鋼管內(nèi)再生混凝土的強(qiáng)度等級(jí),有益于提高框架的承載力及初始剛度,但與此同時(shí)框架的延性及耗能能力卻出現(xiàn)退化,因此在實(shí)際工程中應(yīng)綜合考慮來(lái)設(shè)置鋼管內(nèi)再生混凝土的強(qiáng)度等級(jí);隨著方鋼管鋼材屈服強(qiáng)度的提高,方鋼管對(duì)內(nèi)填再生混凝土的約束作用增強(qiáng),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(huì)變差,故在設(shè)計(jì)時(shí)不宜使用屈服強(qiáng)度過(guò)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(nèi),框架的延性隨著鋼管厚度的增加而提高,當(dāng)鋼管厚度超過(guò)6mm時(shí),框架的延性又出現(xiàn)降低的趨勢(shì),這說(shuō)明設(shè)計(jì)時(shí)應(yīng)合理設(shè)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(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.9;TU352.11
本文編號(hào)：2265346
[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(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.9;TU352.11
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