再生保温混凝土剪力墙抗震性能试验与计算方法研究

发布时间：2018-06-09 11:14

本文选题：再生保温混凝土 + 再生粗骨料　；参考：《太原理工大学》2015年博士论文

【摘要】：随着国家对建筑节能要求的不断提升，绿色节能型建筑逐步成为社会关注的焦点及未来建筑发展的主流，以保温混凝土为代表的自保温结构体系以其在全寿命周期中衍生出的多种优势成为目前绿色节能型建筑材料研究的热点。由于建筑业的高速发展对建筑原料需求的增加对资源的消耗和环境的损害日益增加，建筑废料的循环利用成为目前建筑业急需解决的焦点问题，由建筑原材料中回收利用再生骨料在国外已经开始普及并在国内开始推广，利用再生粗骨料生产的再生保温混凝土，具有良好的自保温性能，导热系数可达到0.35W/(m·K)以下，是一种新型“绿色混凝土”，是未来我国混凝土材料的发展趋势。关于再生混凝土的力学特点与抗震能力，国内已有众多的相关研究，但对再生保温混凝土结构抗震性能的研究则是空白，再生保温混凝土既使用了再生粗骨料，，同时又掺加了具有保温性能的轻集料，所以对其承重与抗震性能的研究就显得尤为必要。本文以再生保温混凝土为研究对象，主要内容包括：（1）对再生保温混凝土的抗压强度分布规律及受压应力应变全曲线变化规律进行试验研究。大量的试验数据表明，再生保温混凝土的立方体抗压强度符合正态分布。再生粗骨料对再生保温混凝土的立方体抗压强度分布规律的影响程度要远大于玻化微珠对再生保温混凝土立方体抗压强度的影响，强度为35MPa的再生保温混凝土弹性模量为2.13×104N/mm2。（2）采用扫描电镜（SEM）对再生保温混凝土的微观结构及各级荷载作用后的内部微裂缝发展及分布规律进行观察，并分析了其形成原因及影响因素，以对再生保温混凝土宏观性能进行解释。结果表明，隐藏于再生骨料内部的由破碎所造成不可见的损伤，包括骨料及界面区，成为整个结构体系的薄弱区，纳米级与微米级微粉活性掺合料使界面区孔洞的数量与尺寸都大为减少，玻化微珠的界面并不是再生保温混凝土中最薄弱区。（3）通过对36个试件进行中心拉拔试验并拟合出钢筋与混凝土之间粘结强度与滑移之间的关系曲线。试验结果表明，再生保温混凝土的低弹性模量造成拉拔初期钢筋与混凝土之间的握裹力略低于普通混凝土。变形钢筋与再生保温混凝土之间的粘结强度略大于普通混凝土，峰值滑移量较小，其粘结强度受水泥浆强度的影响较大，当变形钢筋直径较大时，再生保温混凝土的破坏面出现沿骨料内部断裂的现象。（4）本文对十面不同参数的混凝土剪力墙进行拟静力试验，变化的参数包括：混凝土材料、剪跨比、轴压比及边缘纵筋配筋率，研究了低周反复荷载作用下再生保温混凝土剪力墙试件(GSW)的不同设计参数对其抗震性能的影响。结果表明，GSW在不同加载阶段的承载力均略有提升，峰值位移明显高出普通混凝土剪力墙试件(SW)。GSW的剪跨比越大其良好的延性表现的越明显；随着轴压比的增加，承载力的提升幅度越来越小，对延性的损耗程度则越大；增加暗柱配筋率对GSW压侧的主压应力提升较为明显；同样荷载作用下，再生保温混凝土具有更大的塑性变形能力，内部钢筋受力更加均匀。（5）利用ANSYS有限元软件对试验试件进行非线性分析。分析结果与试验结果吻合较好，为再生保温混凝土剪力墙参数扩展分析提供了有效手段。（6）结合国内外剪力墙力学分析理论，从试验的基础上总结出适用于再生保温混凝土剪力墙承载力及顶点水平位移的量化计算及评估方法。再生保温混凝土剪力墙结构的变形能力是非线性阶段需要重点关注的特征。本文在试验基础上对再生保温混凝土剪力墙受力各特征阶段的截面曲率、截面位移角与顶点位移的计算方法进行了探讨，对各估算公式进行验算和调整，提出了以弯曲变形为主的高剪跨比再生保温混凝土的恢复力曲线模型，并给出所有剪力墙的弹塑性位移及弯曲剪切位移的分项计算公式，计算结果与试验值吻合良好。
[Abstract]:With the continuous improvement of energy saving requirements of the country, the green energy-saving building has gradually become the focus of social attention and the mainstream of future architecture development. The self thermal insulation structure system represented by thermal insulation concrete has become a hot spot in the research of green energy saving building materials because of its many advantages derived from the whole life cycle. The increasing demand for construction materials increases the consumption of resources and the damage to the environment. The recycling of building waste has become the focus of the construction industry. The recycling of recycled aggregate in the raw materials of the building has been popularized in foreign countries and has been popularized in China, and the recycled coarse aggregate is used. The recycled thermal insulation concrete has good self thermal insulation performance and the thermal conductivity can reach to below 0.35W/ (M. K). It is a new type of "green concrete". It is a trend of future development of concrete materials in China. There are many related studies on the mechanical characteristics and seismic capacity of recycled concrete. The research on the seismic performance of the structure is blank. The recycled thermal insulation concrete is used both the recycled coarse aggregate and the lightweight aggregate with thermal insulation properties, so it is particularly necessary to study the load bearing and seismic performance of the recycled concrete.
(1) test the distribution law of the compressive strength of recycled concrete and the variation law of the full curve of compressive stress and strain. A large number of experimental data show that the cube compressive strength of recycled concrete is in accordance with normal distribution. The influence degree of recycled coarse aggregate on the distribution of cube compressive strength of regenerated thermal insulation concrete It is far greater than the influence of vitrified microspheres on the cube compressive strength of recycled heat insulation concrete, and the elastic modulus of recycled heat insulation concrete with strength of 35MPa is 2.13 * 104N/mm2.
(2) scanning electron microscopy (SEM) was used to observe the microstructure of recycled and thermal insulation concrete and the development and distribution of internal micro cracks after loading at all levels, and the reasons for its formation and influencing factors were analyzed in order to explain the macro performance of regenerated thermal insulation concrete. The results showed that the interior of recycled aggregate was caused by the breakage. The invisible damage, including the aggregate and the interface area, becomes the weak area of the whole structural system. The nano and micron grade powder active admixtures reduce the number and size of the hole in the interface area, and the vitrified bead interface is not the weakest area in the recycled thermal insulation concrete.
(3) through the central drawing test of 36 specimens and fitting the relationship between the bond strength and the slip between the reinforced concrete and the concrete, the experimental results show that the low modulus of elasticity of regenerated thermal insulation concrete is slightly lower than that of the ordinary concrete. The bond strength is slightly larger than that of the ordinary concrete, and the peak slip is smaller. The bond strength is greatly influenced by the strength of the cement slurry. When the diameter of the rebar is larger, the fracture surface of the recycled concrete is broken along the aggregate.
(4) the static test of concrete shear walls with ten different parameters is carried out in this paper. The parameters include concrete material, shear span ratio, axial compression ratio and the reinforcement ratio of the edge longitudinal reinforcement. The effects of different design parameters on the seismic performance of the recycled concrete shear wall specimens (GSW) under low cyclic cyclic loading are studied. The results show that GSW The bearing capacity in different loading stages is slightly improved, and the peak displacement is obviously higher than that of the ordinary concrete shear wall (SW).GSW, the greater the shear span ratio is, the more obvious the good ductility performance is. With the increase of the axial compression ratio, the lifting amplitude of the bearing capacity is smaller and smaller, the greater the loss of the ductility is, and the increase of the reinforcement ratio of the dark column to the GSW side. The main compressive stress is improved significantly. Under the same load, recycled heat insulation concrete has greater plastic deformation capacity and internal reinforcement is more uniform.
(5) the nonlinear analysis of the test specimen is carried out by ANSYS finite element software. The analysis results are in good agreement with the test results, which provides an effective means for the analysis of the parameter expansion of the regenerated thermal insulation concrete shear wall.
(6) combining with the mechanics analysis theory of shear walls both at home and abroad, the quantitative calculation and evaluation method is summed up on the basis of the test, which is suitable for the bearing capacity and the horizontal displacement of the reinforced concrete shear wall. The deformability of the regenerated thermal insulation concrete shear wall structure is the characteristic of the nonlinear stage. This paper is based on the test. The calculation method of section curvature, cross section displacement angle and vertex displacement in each characteristic stage of the regenerated concrete shear wall is discussed. The calculation and adjustment of each estimation formula are carried out. The restoring force curve model of the recycled concrete with high shear span ratio with bending deformation is put forward, and the elastoplastic properties of all shear walls are given. The calculated formula of displacement and flexural shear displacement is in good agreement with the experimental data.
【学位授予单位】：太原理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU398.2;TU352.11

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