引用本文: | 梁岩,罗小勇,张艳芳.反复荷载作用下锈蚀高强钢筋的性能变化[J].建筑材料学报,2015,18(1):145-150 |
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反复荷载作用下锈蚀高强钢筋的性能变化 |
梁岩1, 罗小勇2, 张艳芳2
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1.郑州大学土木工程学院,河南郑州450001;2.中南大学土木工程学院,湖南长沙410075
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摘要: |
通过锈蚀高强钢筋反复荷载试验,分析了锈蚀对高强钢筋力学性能和耗能性能的影响.同时探究了锈蚀引起高强钢筋力学性能及耗能性能退化的原因,并建立了锈蚀高强钢筋力学性能及耗能性能退化模型.结果表明:高强钢筋随着锈蚀程度的增加,其力学性能不断降低,屈服平台逐渐消失,延性下降,破坏时更加表现为脆性断裂;反复荷载下,高强钢筋随着锈蚀程度的加深,滞回环逐渐缩小,耗能性能降低,使得结构抗震性能下降,地震发生时更易导致结构脆性破坏. |
关键词: 钢筋 锈蚀 反复荷载 力学性能 耗能性能 |
DOI:103969/jissn1007 9629201501026 |
分类号: |
基金项目:国家自然科学基金资助项目(51178470) |
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Property Changes of Corroded High Strength Steel Bars under Cycling Load |
LIANG Yan1, LUO Xiaoyong2, ZHANG Yanfang2
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1.School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;2.School of Civil Engineering, Central South University, Changsha 410075, China
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Abstract: |
Through experiments of corroded high strength steel bar specimens under cycling load, the effect of corrosion on mechanical property and energy dissipation capacity of high strength steel bar were analyzed. Based on test result, the degeneration model of mechanical property and energy dissipation capacity of corroded high strength steel bar was presented. It is revealed that the mechanical properties decrease gradually, the yielding plateau gradually shortens to disappear, ductility decreases, brittle fracture is even more apparent as corrosion rate of reinforcement increases; besides, under cycling load, hysteresis loop becomes narrow, energy dissipation capacity decreases gradually, which makes anti seismic performance of structure degenerate, and brittle failures can happen more easily in earthquakes. |
Key words: steel bar corroded cycling load mechanical property energy dissipation capacity |
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