高温后型钢再生混凝土偏压柱的力学性能研究

MECHANICAL PROPERTIES OF STEEL REINFORCED RECYCLED AGGREGATE CONCRETE ECCENTRIC COMPRESSION COLUMN AFTER HIGH TEMPERATURE

通过5个高温后和1个常温环境型钢再生混凝土柱的偏心受压加载试验,观察其受力破坏过程及形态,获取极限承载力、应变分布和荷载-变形曲线等重要资料,并对取代率和温度对其力学性能的影响规律予以分析。研究结果表明,火灾温度对型钢再生混凝土偏压柱的受力性能影响较大,随着温度的升高,裂缝出现较早,极限承载力和抗弯刚度降低,但变形延性却增大;取代率对其受力性能有一定影响,随着取代率的增加,再生混凝土的极限压应变及延性增大,而极限承载力略为变小;偏心率对型钢再生混凝土偏压柱的受力性能有一定影响,随着偏心率的增大,极限承载力及抗弯刚度显著降低。

Based on the static load tests of five steel reinforced recycled aggregate concrete column specimens after high temperature and one contrastive specimen at ambient temperature,the damage process and failure mode of specimens were observed,ultimate bearing capacity,the stress distribution,load-deformation curve as well as other important information were obtained. The effects of replacement ratio and temperature on the mechanical properties of the specimens were analyzed. The results indicated that high temperature had a great influence on the mechanical properties of steel reinforced recycled aggregate concrete bias columns. It was shown that higher temperature brings cracks forward. The results also indicated that increasing the temperature caused a decrease of bearing capacity and the flexural rigidity while the deformation and ductility were increased. It was shown that increase in replacement ratio of specimens,the ultimate concrete strain as well as ductility were increased but ultimate bearing capacity was decreased. Eccentricity of loading had an influence on the mechanical properties of specimens. With increasing the eccentricity of loading,residual bearing capacity and residual lateral stiffness significantly reduced.