CFRP-ECC永久模板-FRP筋叠合梁抗弯承载力计算方法
首发时间:2020-07-14
摘要:对CFRP网格增强ECC永久模板-GFRP筋混凝土叠合梁进行理论分析,根据混凝土结构规范得出叠合梁的承载力、挠度计算公式,探讨CFRP网格尺寸、CFRP网格厚度、FRP筋配筋率以及永久模板厚度对CFRP网格增强ECC永久模板-GFRP筋混凝土叠合梁受弯性能的影响;对其中4根试验梁进行抗弯性能试验,研究CFRP网格增强ECC永久模板中CFRP网格体积率对叠合梁的抗弯性能的影响。结果表明,叠合梁的控裂能力优异,结构表面裂缝开展更为细密,能改善混凝土材料易开裂、延性差等缺点,同时梁承载力也得到提高;采用本文计算公式所得到的荷载和挠度计算值与试验值吻合较好,可以有效预测CFRP网格增强ECC永久模板-GFRP筋混凝土组合梁的承载力、挠度。
关键词: ECC永久模板 CFRP网格 FRP筋梁 裂缝 挠度 承载力
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Calculation method of bending capacity of CFRP-ECC permanent formwork-FRP tendon composite beam
Abstract:The article makes a theoretical analysis of CFRP grid reinforced ECC permanent formwork-GFRP tendon concrete composite beam.According to the concrete structure specification, the calculation model of the bearing capacity and deflection of the composite beam is obtained, and the effects of CFRP mesh size, CFRP mesh thickness, FRP reinforcement ratio and permanent formwork thickness on CFRP mesh reinforced ECC permanent formwork-GFRP reinforced concrete composite beams were discussed.Four of the test beams were subjected to flexural performance tests to study the effect of CFRP grid reinforced CFRP grid volume ratio in ECC permanent formwork on the flexural performance of composite beams. The results show that the composite beam has excellent crack control ability, and the cracks on the surface of the structure are developed more closely, which can improve the shortcomings of easy cracking and poor ductility of the concrete material, and the beam bearing capacity is also improved. The predicted value of the model is in good agreement with the experimental value, which can effectively predict the bearing capacity and deflection of CFRP grid reinforced ECC permanent formwork-GFRP reinforced concrete composite beams.
Keywords: ECC permanent template CFRP grid FRP reinforced concrete beam Crack Deflection Bearing capacity
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CFRP-ECC永久模板-FRP筋叠合梁抗弯承载力计算方法
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