竹筋陶粒混凝土粘结滑移性能研究

发布时间：2018-10-16 19:22

【摘要】：国家在绿色建筑、建筑节能等方面推出相关政策,建筑产业现代化成为行业发展的重要目标。钢结构住宅体系因其设计和生产的标准化、现场快速装配等优点,成为装配式住宅优选结构体系。维护体系中的墙板是制约其发展的瓶颈,竹筋陶粒混凝土复合墙板具有环保、质轻、保温隔热效果好等优点,应用前景广阔。竹基纤维复合材料(简称“竹筋”)与混凝土的锚固性能是两者协同工作的基础。本文开展试验研究工作,正交试验设计48个拉拔试件,研究混凝土强度等级、粘结长度、竹筋顺纹抗拉强度和截面形式对粘结性能的作用效应影响程度,单因素试验设计75个拉拔试件,研究竹筋粘结长度、截面形式、混凝土强度等级、混凝土类别和养护龄期对粘结性能的影响,观察破坏现象,分析破坏机理,揭示作用规律,根据试验数据,分析各因素对粘结性能影响的相关性。试验研究发现,在竹筋混凝土粘结滑移性能方面,竹筋截面尺寸为重要影响因素,混凝土的强度等级和竹筋与混凝土的初始粘结长度影响显著,竹筋材料抗拉强度影响最小；拉拔试件有竹筋断裂和竹筋拔出两种破坏形式；竹筋混凝土粘结滑移曲线分为六阶段：接触段、强度上升段、强度回弹段、强度稳定段、强度下降段和残余段；不同的阶段由不同的粘结力组成,不同竹筋混凝土之间的滑移阶段也不尽相同；竹筋的截面尺寸越小,锚固长度越长,混凝土强度等级越高,其粘结强度越高。在已有粘结滑移关系模型研究的基础上,借鉴高丹盈连续性曲线模型,提出竹筋混凝土粘结滑移本构关系模型,并以试验粘结滑移关系曲线与理论模型对比验证其可行性；根据试验得到的粘结强度,参照以往学者在钢筋和FRP的粘结滑移研究,拟合推导竹筋混凝土的粘结强度计算公式和锚固长度计算公式,给出设计应用建议。研究发现,本文提出的粘结滑移本构关系模型可应用于竹筋混凝土粘结滑移的研究分析,计算结果与试验结果吻合较好,粘结强度计算公式和锚固长度计算公式科学合理。研究成果可为设计人员提供参考,对新型建材的发展意义重大。
[Abstract]:The government puts forward related policies in green building, building energy saving and so on. Modernization of construction industry has become an important target of industry development. Due to the advantages of standardization of design and production, quick assembly on site, steel structure residential system has become an optimal structural system for prefabricated housing. The wall panel in the maintenance system is the bottleneck restricting its development. The bamboo reinforced ceramsite concrete composite wall board has the advantages of environmental protection, light weight, good heat insulation effect and so on, and has a broad application prospect. The anchoring properties of bamboo-based fiber composites (bamboo bars) and concrete are the basis of their synergistic work. In this paper, 48 drawing specimens were designed by orthogonal test. The influence of strength grade, bond length, tensile strength and section form of bamboo bars on bond properties were studied. Seventy-five pull-out specimens were designed by single factor test to study the influence of bamboo bar bond length, section form, concrete strength grade, concrete type and curing age on bond performance, observe the failure phenomenon, analyze the failure mechanism, and reveal the law of action. According to the experimental data, the influence of various factors on bond performance is analyzed. In the aspect of bond-slip behavior of bamboo reinforced concrete, the section size of bamboo bar is an important factor, the strength grade of concrete and the initial bond length of bamboo bar and concrete have significant influence, and the influence of tensile strength of bamboo reinforcement material is the least. The bond-slip curve of bamboo-reinforced concrete can be divided into six stages: contact section, strength rising section, strength springback section, strength stable section, strength descending section and residual section. Different stages consist of different bonding forces, and the slip stages of different bamboo bars are different. The smaller the section size of bamboo bars, the longer the anchoring length, the higher the grade of concrete strength and the higher the bond strength. On the basis of the existing bond-slip relationship model, the bond-slip constitutive relation model of bamboo reinforced concrete is put forward by using Gao Danying's continuity curve model for reference, and the feasibility is verified by comparing the experimental bond-slip relation curve with the theoretical model. According to the bond strength obtained by experiment and the previous research on bond slip between steel bar and FRP, the formula of bond strength and anchoring length of bamboo reinforced concrete is derived by fitting and deducing the formula of bond strength and anchoring length of bamboo reinforced concrete, and some suggestions for design and application are given. The research results can provide reference for designers and are of great significance to the development of new building materials.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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