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采用干湿循环方法对试验梁进行硫酸盐和氯盐的加速侵蚀,研究不同腐蚀度和锈蚀率时试验梁的破坏形态、开裂情况、抗剪承载力的退化规律。试验结果表明:当腐蚀试验梁受力荷载超过一定的限值,P-w曲线立即笔直地向上发展,斜裂缝的发展较未腐蚀试验梁突然和迅速。随着腐蚀程度的增大,试验梁斜裂缝的开裂越来越晚。λ=2.22时,相对剪切开裂荷载由增到减的拐点为1.914;λ=1.39时,拐点为2.335。试验梁的极限剪切荷载,经历先增后降的阶段。λ=2.22时,极限剪切荷载增长率达到27.92%;λ=1.39时,极限剪切荷载增长率则达到34.47%。在试验数据的基础上建立了试验梁抗剪性能的退化计算模型,为结构设计及结构加固提供参数。
Wet and dry cycles were used to accelerate the corrosion of sulfate and chloride salts on the test beam. The failure modes, cracking and shear resistance of the test beam were studied under different corrosiveness and corrosion rate. The experimental results show that the P-w curve develops straightforwardly when the stress of the corrosion test beam exceeds a certain limit, and the development of oblique cracks is more rapid and rapid than that of the non-corroded test beam. As the degree of corrosion increases, the cracking of oblique cracks in test beams becomes more and more late. When λ = 2.22, the inflection point of the relative shear cracking load from increasing to decreasing is 1.914; when λ = 1.39, the inflection point is 2.335. The ultimate shear load of the test beam experiences a phase of increasing first and then decreasing. When λ = 2.22, the ultimate shear load growth rate reaches 27.92%. When λ = 1.39, the ultimate shear load growth rate reaches 34.47%. Based on the experimental data, a degradation calculation model of the shear strength of the test beam is established, which provides the parameters for structural design and structural reinforcement.