锈蚀钢筋混凝土梁静承载力性能试验  

Experimental Investigation on Static Mechanical Behavior of Concrete Beams with Corroded Reinforcement

作　　者：曾志兴[1] 宋小雷[2,3] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021 [2]江苏省建筑科学研究院有限公司,江苏南京210008 [3]江苏省建筑工程质量检测中心有限公司,江苏南京210008

出　　处：《华侨大学学报（自然科学版）》2011年第1期92-95,共4页Journal of Huaqiao University(Natural Science)

基　　金：福建省自然科学基金项目(E0740009);福建省高等学校新世纪优秀人才支持计划项目(07FJRC05);福建省闽港人才合作项目(24200701)

摘　　要：通过对7根钢筋混凝土梁的静载试验,分析剪跨比和钢筋锈蚀率对试验梁的承载力、荷载-挠度曲线、钢筋和混凝土应变变化等力学性能的影响.结果表明,剪跨比仍是决定钢筋锈蚀梁性能的主要因素,钢筋锈蚀程度并不改变其破坏类型,但钢筋锈蚀严重时会出现由适筋破坏向少筋破坏转变的现象.随着钢筋锈蚀程度的增加,钢筋混凝土梁的承载力和整体刚度均明显下降,屈强比增大,使构件的安全性降低.钢筋锈蚀后,钢筋混凝土梁的正截面平均应变不再符合平截面假定,而是存在钢筋应变滞后的现象.此外,钢筋锈蚀后,钢筋与混凝土之间的协同工作能力下降.根据试验结果,拟合出钢筋锈蚀率为6%～15%范围内锈蚀钢筋混凝土梁的抗弯承载力计算表达式.Based on the static load test of 7 RC beams,the influence of the shear span ratio steel corrosion rate on the beam load carrying capacity,load-deflection curve,reinforced bars and concrete strain,is analyzed.The test results indicate： the shear span ratio is still the main factor influencing the properties of beams with corroded reinforcement;the steel corrosion rate doesn＇t change the failure modes,but the serious corrosion can turn the beam from the balanced reinforcement to the under reinforcement.With increasing the steel corrosion rate,the load carrying capacity and stiffness of beams reduce obviously,the ratio of yield strength to ultimate strength increases,the average strain of steel bars and concrete no longer meets the plane assumption.According to the experimental results,the calculation formulae of the flexural load carrying capacity of the beams with 6%~15% steel corrosion ratio is fitted out.

关 键 词：钢筋混凝土梁 锈蚀率 抗弯承载力 剪跨比 

分 类 号：TU375.1[建筑科学—结构工程] TU312