玻璃纤维混凝土梁挠度和裂缝宽度计算方法研究

RESEARCH ON THE COMPUTATIONAL METHOD OF DEFLECTION AND CRACK WIDTH OF CONCRETE BEAMS REINFORCED WITH GFRP BARS

利用梁的有效惯性矩 ,将玻璃纤维配筋率和弹性模量的影响在Branson公式的m系数中集中得以体现 ,提出了玻璃纤维混凝土梁挠度的计算方法 ,并基于已有的研究成果 ,给出了玻璃纤维混凝土梁裂缝宽度的理论计算公式 ,且与 6根不同配筋率的玻璃纤维混凝土梁的试验结果相比较 。

Methods for predicting the deflections and crack widths of beams reinforced with glass fiber-reinforced polymer (GFRP) are presented herein. To use the effective moment of inertia for concrete beams reinforced with GFRP bars, the effect of the GFRP reinforcement ratios and elastic modulus of GFRP were incorporated in the exponent m of Branson's equation. Based on this investigation and those conducted by other researchers, a theoretical formula for predicting crack width was proposed. Six concrete beams reinforced with different GFRP reinforcement ratios were tested. Their measured deflections and crack widths were compared with the proposed models. The experimental results compared favorably with those predicted by the models.