配表层钢筋混凝土梁受弯性能试验研究
发布时间：2018-11-05 09:01
【摘要】：钢筋混凝土构件的开裂问题一直是国内外专家学者研究的课题之一。随着《混凝土结构设计规范》(GB50010—2010)的颁布实施,我国才明确提出把HRB400、HRB500级钢筋作为我国钢筋混凝土结构的主导钢筋。HRB500级钢筋是我国冶金行业新研制开发的具有优良性能的应用于混凝土结构的高强度钢筋。大力发展应用高强钢筋是当前我国建筑用钢技术进步的需要。目前,我国建筑业迅猛发展,在建筑工程中推广使用高强钢筋,能满足房屋建筑的工程质量要求,提高房屋建筑的防灾减灾能力,保护人民的生命财产安全。随着钢筋屈服强度的不断提高,构件在正常使用极限状态下的钢筋应力、裂缝宽度也相应提高,这是影响高强钢筋推广使用的主要因素。为了解决高强钢筋在我国应用中的问题,使得高强钢筋得以推广,为控制裂缝宽度和挠度,本文提供了一种途径,即在构件的混凝土保护层中配置表层钢筋能较好的控制裂缝宽度,且能在一定程度上提高构件的刚度,进而可促进高强钢筋的推广应用。因此,本课题的研究可以为配表层钢筋应用提供理论基础与试验依据,加速高强钢筋的推广应用。 本文对配置表层钢筋的混凝土梁和未配置表层钢筋的混凝土梁受弯性能进行试验研究,研究了配置表层钢筋的混凝土梁的开裂和受力变形特点,为表层钢筋的工程应用提供指导和参考。 本文通过采用HRB400钢筋的混凝土梁3根及HRB500钢筋的混凝土梁5根进行受弯性能试验研究,根据本次试验数据及前人试验数据,回归出新的平均裂缝间距计算公式,并对现行规范《混凝土结构设计规范》(GB50010-2010)的正截面承载力及裂缝宽度计算公式的使用性能进行评估分析。 试验研究表明：配表层钢筋的保护层较厚的混凝土构件的受弯性能与普通钢筋混凝土构件的受弯性能基本相同,构件表现为良好的受力性能,均实现适筋梁破坏特征,即是所有梁达到受弯承载力极限时,纵向受力钢筋均可屈服。试验结果表明,在对构件进行正截面承载力设计时,作为纵筋的高强钢筋其抗拉强度可充分发挥；在保护层较厚的混凝土构件中配置表层钢筋能较好的控制裂缝宽度。 本文课题为江苏省高校自然科学研究项目(11KJB560005)“配表层钢筋混凝土梁使用性能及设计理论研究”资助。
[Abstract]:The cracking of reinforced concrete members has been one of the topics studied by experts and scholars at home and abroad. With the promulgation and implementation of the concrete structure Design Code (GB50010-2010), China put forward the idea of putting HRB400, into practice. HRB500 grade steel bar is the leading reinforcement of reinforced concrete structure in our country, and HRB500 grade steel bar is a new high strength steel bar with excellent performance applied to concrete structure developed by metallurgical industry in our country. It is necessary to develop and apply high-strength steel bar in China. At present, the construction industry of our country is developing rapidly. The application of high strength steel bars in building engineering can meet the engineering quality requirements of housing construction, improve the ability of disaster prevention and mitigation, and protect the safety of people's life and property. With the continuous improvement of the yield strength of steel bar, the stress and crack width of the steel bar under the normal service limit state also increase correspondingly, which is the main factor that affects the popularization and use of high strength steel bar. In order to solve the problem of the application of high strength steel bar in our country and make the high strength steel bar popularize, this paper provides a way to control the crack width and deflection. That is to say, the surface reinforcement in the concrete cover can control the crack width, improve the stiffness of the member to a certain extent, and promote the popularization and application of high strength steel bar. Therefore, the research of this subject can provide the theoretical basis and experimental basis for the application of surface reinforcement, and accelerate the popularization and application of high strength steel bar. In this paper, the flexural behavior of concrete beams with and without surface reinforcement is experimentally studied, and the cracking and deformation characteristics of concrete beams with surface reinforcement are studied. It provides guidance and reference for the engineering application of surface reinforcement. In this paper, the flexural behavior of three concrete beams with HRB400 reinforcement and five concrete beams with HRB500 reinforcement are studied. According to the experimental data and previous experimental data, a new formula for calculating the average crack spacing is obtained. The performance of normal section bearing capacity and crack width calculation formula of concrete structure Design Code (GB50010-2010) is evaluated and analyzed. The experimental results show that the flexural behavior of concrete members with thick cover layer is basically the same as that of ordinary reinforced concrete members. That is, when all beams reach the ultimate flexural bearing capacity, longitudinal steel bars can yield. The test results show that the tensile strength of the high strength steel bar can be brought into full play in the design of the normal section bearing capacity of the member, and the crack width can be better controlled by placing the surface reinforcement in the thick concrete member with the protective layer. This paper is funded by the Natural Science Research Project of Jiangsu University (11KJB560005), "study on the performance and Design Theory of reinforced concrete Beams with Surface layer".
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.1
本文编号：2311583
[Abstract]:The cracking of reinforced concrete members has been one of the topics studied by experts and scholars at home and abroad. With the promulgation and implementation of the concrete structure Design Code (GB50010-2010), China put forward the idea of putting HRB400, into practice. HRB500 grade steel bar is the leading reinforcement of reinforced concrete structure in our country, and HRB500 grade steel bar is a new high strength steel bar with excellent performance applied to concrete structure developed by metallurgical industry in our country. It is necessary to develop and apply high-strength steel bar in China. At present, the construction industry of our country is developing rapidly. The application of high strength steel bars in building engineering can meet the engineering quality requirements of housing construction, improve the ability of disaster prevention and mitigation, and protect the safety of people's life and property. With the continuous improvement of the yield strength of steel bar, the stress and crack width of the steel bar under the normal service limit state also increase correspondingly, which is the main factor that affects the popularization and use of high strength steel bar. In order to solve the problem of the application of high strength steel bar in our country and make the high strength steel bar popularize, this paper provides a way to control the crack width and deflection. That is to say, the surface reinforcement in the concrete cover can control the crack width, improve the stiffness of the member to a certain extent, and promote the popularization and application of high strength steel bar. Therefore, the research of this subject can provide the theoretical basis and experimental basis for the application of surface reinforcement, and accelerate the popularization and application of high strength steel bar. In this paper, the flexural behavior of concrete beams with and without surface reinforcement is experimentally studied, and the cracking and deformation characteristics of concrete beams with surface reinforcement are studied. It provides guidance and reference for the engineering application of surface reinforcement. In this paper, the flexural behavior of three concrete beams with HRB400 reinforcement and five concrete beams with HRB500 reinforcement are studied. According to the experimental data and previous experimental data, a new formula for calculating the average crack spacing is obtained. The performance of normal section bearing capacity and crack width calculation formula of concrete structure Design Code (GB50010-2010) is evaluated and analyzed. The experimental results show that the flexural behavior of concrete members with thick cover layer is basically the same as that of ordinary reinforced concrete members. That is, when all beams reach the ultimate flexural bearing capacity, longitudinal steel bars can yield. The test results show that the tensile strength of the high strength steel bar can be brought into full play in the design of the normal section bearing capacity of the member, and the crack width can be better controlled by placing the surface reinforcement in the thick concrete member with the protective layer. This paper is funded by the Natural Science Research Project of Jiangsu University (11KJB560005), "study on the performance and Design Theory of reinforced concrete Beams with Surface layer".
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.1
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