FRP/钢-混凝土组合桥面梁受力性能分析、试验与设计方法

A novel type of novel FRP/steel-concrete composite beams was proposed in the proposal for the research objects of high-rise bridge superstructure under severe corrosive environment. The proposed FRP/steel-concrete composite beams possess many advantages, such as excellent corrosion resistance, big flexural rigidity and so on. Experimental study, theoretical analysis and numerical simulation of the proposed FRP/steel-concrete composite beams for mechanical behavior and design method were conducted. Firstly, the mechanical properties of FRP/steel-concrete composite plate under uniaxial and cyclic forces were experimentally investigated to explore the influence of different test parameters. Secondly, new-type FRP/steel concrete composite beams were conceptual designed. Thirdly, the new-type FRP/steel composite perfobond connector is proposed. The push-out tests would be conducted to research the connecting performance between FRP/steel composite perfobond connector and concrete, the interaction mechanism among FRP/steel perfobond connector and concrete was revealed The bond-slip constitutive model of FRP/steel composite perfobond connector can be established the practical shear-resisting design method can be proposed. Fourthly, based on the behavior of FRP/steel material and existing analytical methods of fundamental composite beam theory, the fundamental mechanical properties of FRP/steel-concrete composite beams are investigated by conducting the parametric analyses both theoretically and experimentally, and the simplified analytical and design methods can be proposed with further induction and summarization. Finally, to study the long-term mechanical properties (such as creep, fatigue and temperature difference) of FRP/steel-concrete composite beams, theoretical analysis, numerical simulation and experimental study are conducted with the purpose of proposing long-term mechanical performance theory and corresponding design method for FRP/steel-concrete composite beams. By performing the systematic investigation of mechanical performance of composite beams, as introduced above, a set of practical FRP/steel-concrete composite beam theory including theoretical analysis, experimental research and design method is expected to be established, which provides the scientific basis for the extension of application of this novel composite beam in practical engineering.

以处于恶劣腐蚀环境下的桥面结构为研究对象，本项目提出一种耐腐蚀、抗弯刚度大的新型构件——FRP/钢-混凝土组合梁，并对其力学性能和设计方法进行系统深入的试验研究和理论分析。首先，理论和试验研究新型FRP/钢复合板单调拉伸和循环拉伸的力学性能；第二，概念性设计新型FRP/钢-混凝土组合梁；第三，通过推出试验考察新型FRP/钢复合开孔板与混凝土的连接性能，建立粘结-滑移本构模型；第四，通过弯曲试验研究FRP/钢-混凝土组合梁的力学性能，结合FRP/钢复合材料的受力特性，对比、分析已有的组合梁基本力学性能理论分析方法，提出适合初步设计的简化分析与设计方法；最后，通过理论分析、数值模拟与试验研究FRP/钢混凝土组合梁长期力学性能（徐变、疲劳和温差），提出组合梁长期力学性能理论和分析方法。通过上述组合梁受力性能的系统研究，建立一套实用的 FRP/钢-混凝土组合梁受力性能分析、试验与设计方法，为推广该新型组合梁在实际工程中应用提供科学依据。

针对现阶段FRP(纤维增强复合材料)–混凝土组合梁在实际工程应用过程中存在着初期投入大、刚度低等不足，本项目意在发展新型刚度大、耐腐蚀的FRP/钢-混凝土组合梁。首先，通过试验研究了FRP/钢复合板在单轴和循环拉伸作用下的力学性能，探寻不同的试验参数对其力学性能的影响规律;其次，提出FRP/钢复合开孔板连接方式，通过推出试验考察FRP/钢复合开孔板与混凝土的连接性能，并建立粘结-滑移本构模型，得到实用的抗剪设计方法;再次，设计两种新型的FRP/钢-混凝土组合梁;最后，通过理论分析与试验研究不同试验参数下FRP/钢-混凝土组合梁基本力学性能，以已有的组合梁基本力学性能理论分析方法为基础，对比、归纳、总结并提出适合初步设计的简化分析与设计方法。通过上述组合梁受力性能的系统研究，建立一套实用的 FRP/钢-混凝土组合梁受力性能分析、试验与设计方法，为推广该新型组合梁在实际工程中应用提供科学依据。