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混凝土结构中玻璃纤维增强塑料(GFRP)/钢绞线复合筋的保护层厚度,对保证结构的安全性、适用性和耐久性具有重要意义。基于混杂原理,利用玻璃纤维和钢绞线研制了弹性模量高、耐腐蚀性强的GFRP/钢绞线复合筋。采用拉拔试验,对69个混凝土拉拔试件进行试验研究,测定每个试件的粘结强度。试验变量包括GFRP/钢绞线复合筋的直径、混凝土强度等级和混凝土保护层厚度。通过对试验数据的统计分析,得到了加载端、自由端粘结滑移限值以及粘结强度限值,并在此基础上确定了GFRP/钢绞线复合筋的混凝土保护层厚度的设计建议值。试验数据和设计建议可为GFRP/钢绞线复合筋的工程应用和相关规范的制定提供参考和理论依据。
The thickness of the protective layer of glass fiber reinforced plastic (GFRP) / strand composite reinforcement in concrete structures is of great importance to ensure the safety, suitability and durability of the structure. Based on the hybrid principle, GFRP / strand composite bars with high elastic modulus and strong corrosion resistance were developed by using glass fiber and steel strand. Using the pullout test, 69 concrete specimens were drawn and tested to determine the bond strength of each specimen. The experimental variables include the diameter of GFRP / strand composite bars, the concrete strength grade and the thickness of the concrete cover. Based on the statistical analysis of the test data, the limit values of the load-end and free-end bond slip and the bond strength were obtained. Based on this, the design recommendations for the thickness of the concrete cover of GFRP / value. The experimental data and design suggestions can provide reference and theoretical basis for the engineering application of GFRP / strand composite bars and the related specifications.