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GFRP筋混凝土桩越来越多的应用于地铁车站端头井等需要后期截桩的基坑工程中,但目前其截面受弯承载力计算方法却并不完善。本文从截面受力平衡分析出发,并考虑了圆形截面特性、混凝土和GFRP筋的材料特性,推导了GFRP筋混凝土圆截面受弯承载力计算公式,能够解决GFRP筋混凝土桩的受弯承载力计算问题。通过理论分析和实例计算可知,本文推导的计算公式与现有方法相比,力学意义更加明确,能够考虑GFRP筋的弹性模量及应力状态对截面受弯承载力的影响。
GFRP reinforced concrete piles are more and more used in the excavation of end-pits such as metro stations which require late pile cutting. However, the calculation method of flexural bearing capacity of sections is not perfect at present. Based on the analysis of cross-section force balance and considering the characteristics of circular cross-section and the properties of concrete and GFRP tendons, the formulas for calculating flexural bearing capacity of circular cross-section of GFRP tendons are deduced, which can solve the flexural capacity of GFRP reinforced concrete piles Calculate the problem. Through theoretical analysis and case calculation, the calculation formula deduced in this paper is more clear than the existing methods, and can consider the influence of the elastic modulus and stress state of GFRP tendons on the flexural bearing capacity of the section.