【作者】 刘平；

【导师】 刘春原；

【作者基本信息】 河北工业大学 ， 结构工程， 2012， 博士

【摘要】 HRB500钢筋的强度高且延性好，具有节约能源、降低材料消耗等优点，在国外的发达国家已经广泛应用于实际工程中。HRB500级钢筋已经列入我国现行《混凝土结构设计规范》（GB50010-2010）。但是应用HRB500钢筋作受力主筋有可能会使结构构件处在高应力状态时而出现过宽的裂缝而不满足结构的适用性与耐久性的要求。因此进行对配置HRB500高强钢筋的混凝土结构的理论研究及试验分析研究具有重要的实际意义和工程应用指导意义。进行配置HRB500高强钢筋的混凝土梁的受弯、受剪性能试验研究，分析构件承载能力、构件破坏形态、裂缝开展和变形特点。对掺入定量的聚丙烯纤维混凝土梁对比分析其受弯承载力、挠度与裂缝宽度。研究结果表明：配置HRB500钢筋混凝土梁的受力性能与配置普通钢筋的混凝土梁相同；配置HRB500高强钢筋的混凝土梁的受弯承载力、受剪承载力、挠度及裂缝宽度均可以按照现行《混凝土结构设计规范》（GB50010-2010）及《混凝土结构设计规范》(GB50010-2002)中相关公式计算。掺入聚丙烯纤维可以提高试件的抗裂能力，减小裂缝间距和裂缝宽度，以满足裂缝宽度限值的要求。对配置HRB500高强钢筋的混凝土梁和配置HRB500高强钢筋的聚丙烯纤维混凝土梁进行正常使用极限状态下裂缝宽度的可靠度对比分析。结果表明：配置HRB500高强钢筋的混凝土梁正常使用极限状态下基于裂缝宽度的可靠度指标较低，而掺入定量聚丙烯纤维的高强钢筋混凝土梁的可靠度指标较高。采用有限元法对聚丙烯纤维混凝土梁进行非线性分析，建立三维有限元模型，对聚丙烯纤维混凝土梁的受力过程进行数值模拟。有限元模拟的试验梁的极限弯矩、荷载-挠度曲线及荷载-钢筋应力曲线和试验吻合较好，该模型能够有效模拟聚丙烯纤维混凝土梁受弯性能。在试验研究的基础上，将HRB500钢筋成功应用于工程实践。建设“河北省建设服务中心”示范工程，完成现场试验并进行效益分析。同时在河北工业大学土木工程试验室工程上进行应用研究。实践结果表明：HRB500高强度钢筋在工程中的推广应用具有显著的经济及社会效益，其应用前景广阔。更多还原

【Abstract】 HRB500steel bar is a kind of high strength and strong ductility steel bar. It has a number ofadvantages, such as saving energy and reducing the material consumption. It has been widelyused in developed countries. It has been taken in by Code for design of concretestructures(GB50010-2010). However, the concrete beam with HRB500high strength steel barsmay appear oversized cracks, which can not satisfy the requirement for applicability anddurability. Therefore, it is very meaningful to research the structure with HRB500high strengthsteel bars.The flexural specimens and shear specimens with HRB500high strength steel bars werecarried out. The bearing capacity, failure pattern, crack width and deformation of concrete beamsreinforced with HRB500high strength steel bar were analyzed. Furthermore, comparativeexperimental research on8flexural members added polypropylene fibers was carried out inorder to research the bending capacity, deformation and crack width of beams reinforced bypolypropylene fiber. It is shown that concrete beams reinforced with HRB500high strength steelbar can work well as the common reinforced concrete beams. The bending capacity, shearcapacity, deformation and crack width of polypropylene fiber concrete beams reinforced withhigh strength steel bar can still be calculated according to GB50010-2010and GB50010-2002.Such method as adding polypropylene fiber can enhance anti-crack performance of specimensand reduce the crack spacing and crack width to meet the limits of the maximum crack width.Comparative analysis of reliability based on crack width in serviceability limit statebetween reinforced concrete with HRB500reinforcements and members reinforced bypolypropylene fibers. The analysis results indicate that reliability indexs based on crack width inserviceability limit state of reinforced concrete with HRB500reinforcements is low andreliability index of the others is promoted with polypropylene fibers.Adopting the finite element method to analyze the polypropylene fibers reinforced concretebeam was the further studied. The3-D finite element model was established and nonlinear finiteelement method was used to analyze the mechanical process of polypropylene fibers concrete beam.The numerical results of ultimate montion, load-deflection curve and load-steel stresscurve showed good agreement with the experimental results. It is indicates that nonlinear finiteelement method can effectively simulate the flexural polypropylene fibers concrete beam.Based on the experiment of beams with HRB500high strength steel bars, it has beenapplied to engineering practice. The demonstration project of Hebei province constructionservice center were built up and filed test and economical benefits analysis were done. TheHRB500steel bars are applied in foundation project of school of Civil Engineering HebeiUniversity of Technology. It is shown that the HRB500steel bar has economic, social benefitsand extremely wide application prospect.更多还原