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随着近年来传统钢筋混凝土结构的腐蚀问题日益严重,GFRP筋替代传统钢筋作为主要受力筋应用在混凝土结构中得到国内外专家的一致认可,对GFRP筋混凝土结构的受力性能研究成为各大科研机构重点探讨的热点问题。当GFRP筋应用在混凝土梁结构中时,由于GFRP筋的弹性模量较传统钢筋较低,导致GFRP筋梁在受外力作用时变形相对较大,其裂缝宽度也会相对较宽。为了研究GFRP筋配筋率对GFRP筋混凝土梁受弯性能的影响,采用大型通用有限元分析软件ABAQUS对配有GFRP筋的混凝土梁进行数值模拟分析。结果表明:在GFRP筋配筋率较高时,GFRP筋混凝土梁的极限承载力会有所提高。增大配筋率对开裂荷载几乎没有影响,原因是混凝土的抗拉性能差,增加配筋率反而会降低跨中极限位移。
With the increasing corrosion of traditional reinforced concrete structures in recent years, GFRP tendons have been widely accepted by experts both at home and abroad instead of traditional steel bars as the main force applied to reinforced concrete structures. The research on the mechanical properties of GFRP reinforced concrete structures has become a major issue Research institutes focus on the hot issues. When GFRP tendons are used in concrete beam structures, the GFRP tendons tend to deform more when subjected to external forces due to the lower elastic modulus of GFRP tendons than conventional ones, and the crack width will be relatively wide. In order to study the influence of GFRP tendon reinforcement ratio on the flexural behavior of GFRP tendons, the numerical simulation analysis of the GFRP reinforced concrete beam was carried out by using the generalized finite element analysis software ABAQUS. The results show that the ultimate bearing capacity of GFRP tendons will be increased when the reinforcement ratio of GFRP tendons is high. Increasing the reinforcement ratio has almost no impact on the cracking load, because the tensile properties of concrete is poor, increasing the reinforcement ratio but will reduce the mid-span displacement.