大气环境下严重锈蚀钢筋混凝土梁力学性能试验研究  

Experimental Study of Mechanical Properties of Severely Corroded Reinforced Concrete Beams in Atmospheric Environment

作　　者：沈德建[1] 吴胜兴[2] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]河海大学土木工程学院,江苏南京210098

出　　处：《桥梁建设》2007年第1期28-31,共4页Bridge Construction

基　　金：国家自然科学基金资助项目"钢筋混凝土结构锈裂损伤的参数识别与系统仿真评估"(50079002)

摘　　要：大气环境中17根严重锈蚀钢筋混凝土梁试验表明,严重锈蚀梁的截面延性和刚度随着锈蚀率的增加而降低,在锈蚀率大致相同的情况下,Ⅱ级钢筋浇筑的梁的下降程度比Ⅰ级钢筋要大。Ⅰ级钢筋浇筑的梁锈蚀后存在明显的屈服点;Ⅱ级钢筋浇筑的梁锈蚀后屈服点不明显,因而可能发生脆性破坏。提出严重锈蚀钢筋混凝土梁承载能力的计算公式。The experimental study of 17 pieces of the severely corroded reinforced concrete beams in atmospheric environment indicates that the ductility and rigidity of sections of the severely corroded beams decrease with the increase of corrosion ratios of the beams. Under condition that the corrosion ratios are almost identical, the decrease degrees of the beams laid with Grade Ⅱ reinforcement are greater than those of the beams with Grade Ⅰ reinforcement. The beams with Grade Ⅰ reinforcement have obvious yielding points after they have been corroded while the yielding points of the beams with Grade Ⅱ reinforcement in similar situations are not obvious, therefore the potential brittle failure of the latter beams may occur. In this paper, the expressions for calculating the load carrying capacity of the severely corroded beams are put forward.

关 键 词：钢筋混凝土梁 锈蚀 力学性能 试验 

分 类 号：U445.73[建筑科学—桥梁与隧道工程]