结构工程师2013，Vol.29Issue(3)：119-126,8.
受火后冷拔低碳钢丝预应力混凝土空心板受弯性能试验研究
Flexural Behaviors of PC Hollow-core Slab with Cold-drawn Low-carbon Wire after Fire
摘要
Abstract
To learn the mechanical performance of prestressed concrete hollow-core slabs with cold-drawn lowcarbon wire after exposed to fire,7 specimens were experimentally studied.In which including 3 control slabs and 4 slabs exposed to fire for 20 min,40 min,60 min and 80 min,respectively.The test results showed that the failure of control slabs and exposed slabs were all a bending failure mode.During the exposed procedure,the mid-span displacement of slabs increased with the exposed time,the mid-span displacement of the slabs exposed to fire for 20 min and 40 min could fully restored after cooling by air while the slabs exposed to fire for 60 min and 80 min decreased to nearly 15mm.When the exposed time extended,the crack load,ultimate load and initial bending stiffness of exposed slabs decreased with the exposed time increased,approximately with an linear relationship.The strain distributions along the height of the fire-damaged slabs at middle-span are nearly linear during the whole loading process,that is,a plan section remained almost plan.At the same load level,the tensile strain of bottom surface and the compressive strain of top surface of exposed slabs were all larger than the control slabs.关键词
预应力混凝土空心板/冷拔低碳钢丝/受火后/受弯性能Key words
PC hollow-core slab/ cold-drawn low-carbon wire/ after fire/ flexural behavior引用本文复制引用
李向民,陈振龙,许清风,韩重庆..受火后冷拔低碳钢丝预应力混凝土空心板受弯性能试验研究[J].结构工程师,2013,29(3):119-126,8.基金项目
上海市科委应用技术开发项目(2011-114) （2011-114）
上海市人才发展资金资助项目(2011058) （2011058）
