盐冻腐蚀试件受弯极限承载力演化模型分析

Analysis on Evolving Model of Ultimate Bearing Capacity in Bending of Salt-freezing Corrosion Specimens

摘要:

为了研究西北典型地区钢筋混凝土试件抵抗盐溶液、冻融腐蚀作用对受弯极限承载力的影响规律，采用室内抗弯承载力试验对腐蚀后的试件进行测试，选取不同水胶比、纵筋布筋形式、钢筋保护层厚度3种参数进行腐蚀试件的抗弯性能对比分析，结果表明冻融腐蚀破坏远大于盐溶液腐蚀破坏，水胶比是影响试件极限承载力的主要因素。随着保护层厚度的增大，试件耐久性提高，而试件易发生开裂，从而提出盐溶液腐蚀和冻融循环作用下钢筋混凝土试件受弯斜截面极限承载力的演化模型函数。

Abstract:

In order to study the effect of salt solution, freeze-thaw corrosion on the flexural ultimate bearing capacity of reinforced concrete specimens in a typical region of Northwest China, the indoor bending bearing capacity test is used to test the corroded specimens. Three different parameters of water-adhesive ratio, longitudinal bar distribution form and reinforced protective layer thickness are selected to compare and analyze the bending performance of corroded specimens. The results conclude that the freeze-thaw corrosion damage is much larger than the salt solution corrosion damage, and the water-adhesive ratio is the main factor affecting the ultimate bearing capacity of the specimen. As the durability of the specimen increases with the increase in the thickness of the protective layer, and the specimen is prone to cracking. Therefore, the evolution model function of the ultimate bearing capacity of the flexural inclined section of reinforced concrete specimens under the action of salt solution corrosion and freeze-thaw cycles is proposed.