高强钢筋高性能混凝土梁柱构件受力机理研究

Application of high strength reinforcement and high strength-high performance concrete has become an urgent need in modern engineering structures in order to meet the demand of the development of energy saving society. The improper use of high strength reinforcement will lead to a series of problems, such as the concrete crack width is too large, the deflection is not easy to control, seismic performance decline. Therefore, according to the characteristics of the force component, reasonable matching high strength reinforcement with high strength-high performance concrete, supplemented by the corresponding construction measures, can give full play to the advantages of both performance and achieve good technical and economic effect. In the project, aiming at the HRB600 grade high strength steel bar production of our country in recent years and combining steel fiber reinforced concrete and concrete filled steel tubular laminated column technology, the high performance beams and columns made of high strength steel bars and high strength-high performance concrete will be developed, and the experimental study and theoretical analysis about the bonding properties between HRB600 steel bar and high strength-high performance concrete as well as the mechanical performance of beams and columns made of them will be also systematically carried out. The bond slip constitutive relation between the HRB600 steel bar and high strength-high performance concrete will be established. On this basis, the mechanical performance and accumulative damage evolution law will be analyzed for different high strength-high performance concrete beams and columns reinforced with HRB600 steel bars. Through analyzing their failure mechanism, the seismic hysteretic models and calculation method of bearing capacity, deformation and crack width for them will be put forward, and the reasonable construction measures will also be advised. This will lay the foundation for the engineering application.

为适应能源节约型社会发展需求，在现代大型工程结构中推广应用高强钢筋和高强高性能混凝土已成为亟需。当高强钢筋使用不当时，可导致混凝土构件裂缝宽度过大、挠度不易控制、抗震性能下降等问题。为此，需根据构件的受力特点，进行高强钢筋与高强高性能混凝土的合理匹配，辅以相应构造措施，才能充分发挥两者的性能优势，取得良好的技术经济效果。本项目针对我国近期生产的HRB600级高强钢筋，结合钢纤维混凝土和钢管叠合柱技术，研发高性能的高强钢筋高强混凝土梁柱构件，较系统地进行HRB600级钢筋与高强高性能混凝土粘结锚固性能及梁柱构件力学性能试验研究与理论分析，建立HRB600级钢筋的粘结滑移本构关系，研究不同设计参数的HRB600级钢筋高强高性能混凝土梁柱构件截面性能和损伤累积演化规律，分析破坏机理，建立承载力、变形和裂缝宽度计算模型与公式，建立恢复力模型，提出合理的抗震设计方法与构造措施，为工程应用奠定基础。

为适应能源节约型社会发展需求，在现代大型工程结构中推广应用高强钢筋和高强高性能混凝土，本项目针对我国生产的HRB600级高强钢筋，结合钢纤维混凝土和钢管叠合柱技术，研发了高性能的高强钢筋高强混凝土梁柱构件，较系统地进行了HRB600级钢筋与高强高性能混凝土粘结锚固性能、梁柱构件基本力学性能和柱构件抗震性能试验研究与理论分析，建立了HRB600级钢筋与高强高性能混凝土的粘结应力-滑移本构关系，揭示了不同设计参数的HRB600级钢筋高强高性能混凝土梁柱构件截面性能和损伤累积演化规律，分析了破坏机理，建立了承载力、变形和裂缝宽度计算模型与公式，建立了HRB600级钢筋高强高性能混凝土柱的抗震分析模型与公式，优化了HRB600级钢筋高强高性能混凝土梁柱构件的设计参数，给出了材料强度合理匹配等级、配筋方法、延性增强方法，给出了HRB600级钢筋高强高性能混凝土结构基于性能的抗震设计方法与构造措施，为工程应用奠定了基础。经过合理设计，HRB600级钢筋高强高性能混凝土结构能较好地满足高抗震设防烈度地区的抗震要求，社会经济效益良好，具有较大的推广应用价值。