锈蚀钢筋混凝土梁的力学性能及拱效应分析

Analysis of Mechanical Properties and Arch Effect of Corroded Reinforced Concrete Beams

对锈蚀率为0%,3%,6%,9%,12%,15%,18%的钢筋混凝土梁进行力学试验,分析试验梁的挠度、钢筋应变等指标随荷载及锈蚀率的变化规律,揭示不同锈蚀率钢筋混凝土梁受荷过程钢筋应力传递规律,以及荷载等级、钢筋锈蚀率与锈蚀钢筋混凝土梁的拱效应关系.结果表明:钢筋锈蚀会引起钢筋与混凝土间粘结性能退化,钢筋应力呈现由跨中向两端传递的趋势,锈蚀梁承载机理趋于拱效应,锈蚀钢筋混凝土梁的拱效应随着荷载等级与钢筋锈蚀率的增加而增强.

Based on the mechanical test of the reinforced concrete （RC） beams with different corrosion ratios of the reinforcement, including 0% ,3% ,6% ,9% ,1 2%,15% and 18% , the indexes of the deflection and the steel strain of the test beams were analyzed with the various loads and corrosion ratios, to investigate the reinforcement stress of the test beams with different corrosion ratio during the load process, and the relation-ship among the arch effect of corroded reinforced concrete beams, the load grade and reinforced corrosion rati-o. The results show that the reinforcement corrosion degrades the bond performance between steel and con-crete ;the stress of steel bar transfers from the mid-span to the beam end. In addition, the load-bearing mecha-nism of corroded beam tends to arch effect; the arch effect of corroded reinforced concrete beam enhances with the increase of the load level and the steel bar corrosion ratio.