摘要
对20根长径比为3.5,内填54～116 MPa的钢管混凝土的力学性能进行了研究.研究结果表明,采用钢管约束可以显著地改善高强混凝土的延性,改善的程度随套箍指标F的增加而增加.钢管内混凝土强度的增加也与套箍指标F成正比.为彻底改善高强混凝土的塑性,套箍指标F应大于等于0.48.最后给出了钢管高强混凝土承裁能力计算公式.
This study investigated the mechanical properties of 20 High Strength Concrete filled steel tubular short columns （ HSCFSTSC ） with length to diameter ratio （ IMD ） of 3.5. The strength of concrete used to fill the steel tubular columns ranged from 54MPa to 116MPa. The test results showed that using a steel tube as confinement can significantly improve the ductility and compressive strength of core concrete. The magnitude of compressive strength increase of core concrete was directly proportional to the Confinement Index, F, and the extent of improvement of the ductility increases as the F increases. For thoroughly improving the ductility of core concrete, the Confinement Index F should be equal to or larger than 0.48. The formula used to calculate the load bearing capacity of HSCFSTSC was given out.
出处
《西南科技大学学报》
CAS
2005年第3期22-27,54,共7页
Journal of Southwest University of Science and Technology
关键词
钢管混凝土
承载能力
高强混凝土
concrete filled steel tube
load bearing capacity
high strength concrete
