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冻融循环作用后钢筋混凝土梁受剪性能研究
doi: 10.13204/j.gyjz201502008
STUDY OF THE SHEAR BEHAVIORS OF RC BEAMS AFTER FREEZE-THAW CYCLES
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摘要: 为研究冻融循环作用对钢筋混凝土梁受剪性能的影响,对分别经历0,75,100,125,150次冻融循环作用的立方体试块进行了抗压强度试验,并对设计制作的45根钢筋混凝土梁分别经历0,75,100,125次冻融循环后的静力受剪性能进行试验。分析了混凝土质量损失率、相对动弹性模量、相对抗压强度、相对抗拉强度与冻融循环次数的关系。研究不同冻融循环次数、不同箍筋间距对混凝土梁受剪性能的影响。研究结果表明:混凝土试块质量、相对动弹性模量、相对抗压强度和相对抗拉强度均随着冻融循环次数的增加而下降;梁的开裂荷载、极限荷载都随着冻融循环次数的增加而降低;GB 500102012《混凝土结构设计规范》关于梁受剪承载力的计算理论适用于冻融循环作用后的钢筋混凝土梁。Abstract: In order to investigate the shear behaviors of RC beams after freeze-thaw cycles，compressive strength test of concrete cubes after 0，75，100，125，150 freeze-thaw cycles were made，and static shear experiment of 45 RC beams after 0，75，100，125，150 freeze-thaw cycles were also made． The relationships of relative compressive strength of concrete，mass loss rates，relative dynamic modulus of elasticity and freeze-thaw cycles were analyzed． The influences of different numbers of freeze-thaw cycles on the shear behaviors of RC beams with different stirrup spacing were studied． The results showed that concrete cubesmass，relative dynamic modulus of elasticity， relative compressive strength and relative tensile strength were decreased with the increasing of freeze-thaw cycles． Cracking loading and ultimate loading of shear beams were decreased with the increasing of freeze-thaw cycles． Current concrete structure design code about ultimate loading of shear beams is still suitable for RC beams after freeze-thaw cycles．
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Key words:
- freeze-thaw cycle /
- reinforced concrete beams /
- shear behaviors /
- experimental study
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