配BFG蒸压加气混凝土砌块填充墙框架抗震性能试验研究

发布时间：2019-04-21 11:31

【摘要】：填充墙框架结构是广泛应用于房屋建筑中的一种结构体系。国内外大量震害表明,在强震作用下填充墙与框架相互作用非常复杂,导致结构和填充墙都发生了严重破坏,采用传统填充墙连接方式已不能完全满足填充墙框架抗震性能要求。我国墙体改革,限制粘土砖的使用之后,蒸压加气混凝土砌块作为一种绿色环保墙体材料,符合国家可持续发展战略。为充分发挥其性能优势以及满足节能环保的要求,砌体需采用薄灰缝(不大于5mm),故不能按常规要求直接配置Φ5~6mm的钢筋,而传统的割槽配筋做法施工又较为繁琐。因此迫切需要寻找一种钢筋替代品,它既能实现薄灰缝,又能提高墙体延性,对墙体变形构成强有力约束。本文采用蒸压加气混凝土砌块作为填充墙材料,尝试用玄武岩纤维格栅替代钢筋作为填充墙的拉结材料,主要工作如下:(1)查阅大量的文献以及广泛调研之后,本文选取了一种性能较好的材料——玄武岩纤维格栅(简称BFG),并对其进行了基本力学性能试验,结果表明该材料力学性能能够满足设计要求;(2)考虑了纤维格栅材料类型、布置方式及表面处理方式等因素对配BFG蒸压加气混凝土砌块砌体进行了基本力学性能试验研究,对比分析了未配置纤维格栅与配置纤维格栅砌体抗压和抗剪强度,结果表明在蒸压加气混凝土砌块砌体灰缝中配玄武岩纤维格栅提高了砌体的抗压强度及抗剪强度,与未配格栅的普通砌体相比,抗压强度提高约10%,抗剪强度提高约13%。灰缝厚度为5mm左右,能满足薄灰缝设计要求;(3)针对玄武岩纤维格栅的特性,设计了两种墙-框架柱连接方式,并对配BFG蒸压加气混凝土砌块填充墙进行了平面内和平面外抗震性能试验。平面内抗震性能试验对比分析了纯框架和两种连接方式的填充墙框架破坏特征、滞回曲线、骨架曲线、强度衰减、刚度退化、位移延性以及耗能能力,结果表明与纯框架相比,本文采用的两种连接方式的配BFG蒸压加气混凝土砌块填充墙框架承载能力提高很小;平面外抗震性能试验对比分析了两种连接方式的填充墙破坏特征、面外荷载-位移曲线、墙体位移分布以及格栅应变分布,结果表明玄武岩纤维格栅能限制墙体的位移,能提高墙体的抗倒塌能力;(4)根据配BFG蒸压加气混凝土砌块填充墙的抗震性能试验结果,对应用玄武岩纤维格栅作为填充墙拉结材料进行了可行性分析,结果表明配BFG填充墙面外承载能力能够满足水平地震作用力的要求,且较传统的拉筋连接更加的经济。
[Abstract]:Filled-wall frame structure is a kind of structure system which is widely used in building. A large number of earthquake disasters at home and abroad show that the interaction between the filled wall and the frame is very complex under the action of strong earthquakes, which leads to serious damage to the structure and the filled wall. The traditional filled wall connection can not fully meet the seismic performance requirements of the filled wall frame. The autoclaved aerated concrete block, as a kind of green and environmental protection wall material, accords with the national sustainable development strategy after the wall reform in our country and the restriction on the use of clay brick. In order to give full play to its performance advantages and meet the requirements of energy saving and environmental protection, the masonry should adopt thin ash joints (no more than 5mm), so the reinforcement of 桅 5~6mm can not be directly configured according to the conventional requirements, and the construction of traditional grooving reinforcement is more tedious. Therefore, there is an urgent need to find a replacement steel bar, which can not only realize the thin ash seam, but also improve the ductility of the wall, thus forming a strong constraint on the deformation of the wall. In this paper, autoclaved aerated concrete block is used as filling wall material, basalt fiber grid is used to replace steel bar as tension material for filling wall. The main work is as follows: (1) after consulting a large number of literature and extensive investigation, In this paper, basalt fiber grille (BFG), a kind of material with good performance, is selected and tested for its basic mechanical properties. The results show that the mechanical properties of the material can meet the design requirements. (2) the basic mechanical properties of BFG autoclaved aerated concrete block masonry are studied by considering the types of fiber grille materials, layout and surface treatment. The compressive strength and shear strength of non-fiber grille masonry and fiber-reinforced grille masonry are compared and analyzed. The results show that the compressive strength and shear strength of the masonry are improved with basalt fiber grille in the ash joint of autoclaved aerated concrete block masonry, and the compressive strength and shear strength of the masonry are improved by using basalt fiber grid. Compared with the ordinary masonry without grille, the compressive strength and shear strength are increased by about 10% and 13% respectively. The thickness of gray seam is about 5mm, which can meet the design requirements of thin ash seam. (3) according to the characteristics of basalt fiber grid, two kinds of wall-frame column connection modes are designed, and the in-plane and out-of-plane seismic performance tests of filled walls with BFG autoclaved aerated concrete block are carried out. The failure characteristics, hysteretic curves, skeleton curves, strength attenuation, stiffness degradation, displacement ductility and energy dissipation capacity of the filled wall frame with pure frame and two connection modes are compared and analyzed by in-plane seismic performance tests. The results show that compared with the pure frame, the results show that, In this paper, the load carrying capacity of BFG autoclaved aerated concrete block filled wall frame with two connection modes is improved little. The results of out-of-plane seismic tests show that basalt fiber grid can limit the displacement of the wall, including the failure characteristics, out-of-plane load-displacement curve, wall displacement distribution and grid strain distribution of the two kinds of connections, and the results show that the wall displacement can be limited by basalt fiber grid. It can improve the anti-collapse ability of the wall; (4) based on the experimental results of seismic performance of filled wall filled with BFG autoclaved aerated concrete block, the feasibility analysis of basalt fiber grille used as tension material for filling wall is carried out. The results show that the out-of-plane bearing capacity of the wall filled with BFG can meet the requirements of horizontal seismic forces, and it is more economical than the traditional tie-up connections.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11

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