冻融环境下混凝土梁受弯性能研究  

RESEARCH ON BENDING PERFORMANCE OF CONCRETE BEAMS AFTER FREEZE- THAW CYCLES

作　　者：张文超[1] 段安[1] 李志远[1] 

机构地区：[1]浙江大学结构工程研究所,杭州310058

出　　处：《低温建筑技术》2014年第4期42-45,共4页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目(51108413);中央高校基本科研业务费专项资金资助(2012QNA4016)

摘　　要：为研究冻融循环作用对钢筋混凝土梁受弯性能的影响,开展了快速冻融循环试验,接着对冻融后的梁进行了静载试验。量测了荷载-挠度曲线、截面应变及抗弯刚度。结果表明:在冻融循环作用下,随着冻融次数的增加,抗弯刚度和极限承载力均呈下降趋势,极限状态下试件梁中和轴不断下移,受压区高度有明显增大趋势。An experimental research was performed on the flexural behavior of reinforced concrete beams after exposure to freeze-thaw cycles. The stiffness, ultimate bearing capacity, concrete stain distri- bution across the depth of section, and load-deflection curve of the frozen-thawed beams were meas- ured. The results showed that with the increase of the freeze-thaw cycles, the stiffness and the ultimate bearing capacity decreases, the neutral axis moves down at the ultimate load and the depth of compression zone increases significantly.

关 键 词：冻融循环 钢筋混凝土梁 受弯性能 

分 类 号：TU375[建筑科学—结构工程]