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从理论和试验的角度,分析玻璃纤维加固的纤维复合(FRP)钢管混凝土梁(RCFFT)的抗弯强度和性能。共进行10根梁的四等分点加载试验。细丝状环绕的玻璃FRP钢管被用于试验梁的结构模板。其中,6根梁采用玻璃FRP筋加固,而另4根采用一般钢筋加固。试验参数为FRP钢管管壁厚度、混凝土抗压强度、钢管内部加固材料(钢或FRP筋)的类别和横向加固材料(螺旋钢或FRP钢管)的类别。基于实际测量的荷载、变形和应力值,讨论了梁的屈服强度、极限强度、失效模式和延性。结果显示,FRP钢管梁的延性和强度有所提高。提出一种从线弹性分析理论派生的简化方法,可用于预测RCFFT梁在破坏模式下的屈服弯矩和抵抗弯矩。另外,提出开裂弯矩求解的改进方程,用于说明FRP钢管作为约束结构产生的效应。
From the perspective of theory and experiment, the flexural strength and performance of fiberglass reinforced concrete composite (FRP) concrete filled steel tube beams (RCFFT) are analyzed. A total of 10 beam quadrants loading test. Filament-wrapped glass FRP pipe was used to test the beam’s structural template. Among them, 6 beams are reinforced with FRP bars and 4 bars are reinforced with normal bars. The test parameters are the type of FRP pipe wall thickness, the compressive strength of concrete, the type of steel internal reinforcement (steel or FRP bars), and the transverse reinforcement (spiral steel or FRP steel). Based on the actual measured load, deformation and stress values, the yield strength, ultimate strength, failure mode and ductility of the beam are discussed. The results show that the ductility and strength of FRP steel pipe girders have been improved. A simplified method derived from the theory of linear elasticity analysis is proposed, which can be used to predict yield moment and resistance moment of RCFFT beams in failure mode. In addition, an improved equation for solving the cracking moment is proposed to illustrate the effect of the FRP steel tube as a constrained structure.