HRB500钢筋轻骨料混凝土构件局部受压性能研究
发布时间：2018-10-23 19:59
【摘要】：“轻质、高强、变形性能好”是工程结构的发展方向之一。轻骨料混凝土不仅轻质,而且具有较好的强度和变形性能,具有良好的隔音、保温和耐火性能。HRB500钢筋不仅强度高,而且具有良好的变形性能,现行国家标准《混凝土结构设计规范》(GB 50010-2010)将其作为主导钢筋推广应用。局部受压是结构的一种基本受力特征,但是文献检索发现,迄今国内外对于轻骨料混凝土局部受压的研究仅局限于配置间接钢筋构件的局部受压性能研究,而对于同时配置间接钢筋与HRB500钢筋骨架的局部受压性能研究还未见报道,鉴于工程需求和《轻骨料混凝土结构技术规程》(JGJ12-2006)修订的需求,该问题亟待研究解决。因此,本文对HRB500钢筋轻骨料混凝土的局部受压性能进行了系统的研究。通过25个模拟预应力轻骨料混凝土梁锚固端的局部受压性能试件(本文称之为Ⅰ类试件)的试验,获得了试件的破坏形态、楔形体特征、荷载-位移曲线等相关试验结果。通过对试验结果的分析,得到了配筋、Ab/Al、Acor/Al、轻骨料混凝土强度等参数对局部受压性能的影响规律。通过运用两种方法对试验数据进行拟合分析,提出了考虑HRB500钢筋骨架和间接钢筋的预应力轻骨料混凝土梁锚固端的局部受压承载力计算公式。通过25个模拟高架桥桥面结构支座下轻骨料混凝土盖梁的局部受压性能试件(本文称之为Ⅱ类试件)的试验,获得了与Ⅰ类试件相似的试验结果。同样通过对试验结果的分析,得到了配筋、Ab/Al、Acor/Al、轻骨料混凝土强度等参数对局部受压性能的影响规律。也通过运用两种方法对试验数据进行拟合分析,提出了考虑HRB500钢筋骨架和间接钢筋的高架桥下轻骨料混凝土盖梁的局部受压承载力计算公式。通过运用两种不同的分析方法对全部50个试件的试验数据进行拟合分析,得到了HRB500钢筋轻骨料混凝土构件的局部受压承载力计算公式。最后,运用ABAQUS软件进行建模分析,得到了试验试件的荷载-位移曲线、破坏形态及特征,获得了配筋、Ab/Al、Acor/Al、轻骨料混凝土强度等参数对局部受压性能的影响规律。试验实测结果和数值模拟结果的比较表明,本文所建立的局部受压性能数值模拟分析方法是可行的。本文的主要研究成果为国家建设行业标准《轻骨料混凝土结构技术规程》(JGJ12-2006)局部受压构件的条文修订提供了技术支撑,同时本文建议的局部受压承载力计算公式被该规程采纳。
[Abstract]:Light weight, high strength and good deformation property is one of the developing directions of engineering structures. Lightweight aggregate concrete not only has light weight, but also has good strength and deformation, sound insulation, heat preservation and fire resistance. HRB500 steel bar not only has high strength, but also has good deformation performance. The present National Standard concrete structure Design Code (GB 50010-2010) takes it as the leading reinforcement to be popularized and applied. Local compression is one of the basic mechanical characteristics of structures. However, the research on local compression of lightweight aggregate concrete is limited to the local compression performance of indirect reinforced members at home and abroad. However, there is no report on the study of the local compression performance of the reinforced concrete skeleton with indirect reinforcement and HRB500. In view of the engineering requirements and the requirement of the revision of the Technical Specification for lightweight aggregate concrete structure (JGJ12-2006), the problem needs to be solved urgently. Therefore, the local compressive behavior of HRB500 reinforced lightweight aggregate concrete is systematically studied in this paper. In this paper, the experimental results of 25 specimens with simulated local compressive behavior at the anchoring end of prestressed lightweight aggregate concrete beams (referred to in this paper as Class I specimens) are obtained, such as failure patterns, wedge characteristics, load-displacement curves, and so on. Through the analysis of the test results, the influence of the strength of reinforced concrete and Ab/Al,Acor/Al, lightweight aggregate concrete on the local compressive performance is obtained. By using two methods to fit the test data, a formula for calculating the local compressive capacity of the anchoring end of prestressed lightweight aggregate concrete beams considering HRB500 reinforcement skeleton and indirect reinforcement is put forward. In this paper, the local compressive properties of lightweight aggregate concrete cover beams under the supports of viaduct deck structures are simulated. The experimental results are similar to those of class 鈪，
本文编号：2290321
[Abstract]:Light weight, high strength and good deformation property is one of the developing directions of engineering structures. Lightweight aggregate concrete not only has light weight, but also has good strength and deformation, sound insulation, heat preservation and fire resistance. HRB500 steel bar not only has high strength, but also has good deformation performance. The present National Standard concrete structure Design Code (GB 50010-2010) takes it as the leading reinforcement to be popularized and applied. Local compression is one of the basic mechanical characteristics of structures. However, the research on local compression of lightweight aggregate concrete is limited to the local compression performance of indirect reinforced members at home and abroad. However, there is no report on the study of the local compression performance of the reinforced concrete skeleton with indirect reinforcement and HRB500. In view of the engineering requirements and the requirement of the revision of the Technical Specification for lightweight aggregate concrete structure (JGJ12-2006), the problem needs to be solved urgently. Therefore, the local compressive behavior of HRB500 reinforced lightweight aggregate concrete is systematically studied in this paper. In this paper, the experimental results of 25 specimens with simulated local compressive behavior at the anchoring end of prestressed lightweight aggregate concrete beams (referred to in this paper as Class I specimens) are obtained, such as failure patterns, wedge characteristics, load-displacement curves, and so on. Through the analysis of the test results, the influence of the strength of reinforced concrete and Ab/Al,Acor/Al, lightweight aggregate concrete on the local compressive performance is obtained. By using two methods to fit the test data, a formula for calculating the local compressive capacity of the anchoring end of prestressed lightweight aggregate concrete beams considering HRB500 reinforcement skeleton and indirect reinforcement is put forward. In this paper, the local compressive properties of lightweight aggregate concrete cover beams under the supports of viaduct deck structures are simulated. The experimental results are similar to those of class 鈪，
本文编号：2290321
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