摘要
对两根尺寸完全相同但纵向配筋率不同的框架深肋组合扁梁进行了静力单向加载试验研究,得到其荷载-挠度关系,不同荷载条件下截面应变分布,混凝土裂缝的发展和分布特征以及试件的破坏模式。试验结果表明:纵向配筋率对框架深肋组合扁梁的弹性阶段刚度影响较小,对极限承载力有一定的影响,同时配筋的增加改善了负弯矩区的开裂状况;在弹性阶段,钢梁、钢筋与受压区的混凝土在弹性受力阶段能够近似保持平截面,板肋处的混凝土分担的荷载很小。
This paper presents experimental investigation carried out on the flexural behavior of two specimens of frame composite slim beam with deep deck under monotonic loading. These two specimens share the same geometric dimensions but different ratio of reinforcement to probe its influence on the flexural stiffness and loading capacity of this new style of composite beam. Experimental results as the cross-section strain distribution in the different loading conditions, the development of the concrete cracks and the failure mode of the specimens are discussed. Slight influences of different ratio of reinforcement have been observed on the flexural stiffness in elastic stage but a certain influence to the loading capacity from the load-deflection curves at the mid-span of the beam. However, the crack propagation is effectively ameliorated when the amount of rebar increases. The result also indicates that the steel section and concrete in compression region satisfy the plane assumption during the elastic stage and the concrete in the rib of deep deck has little contribution to loading capacity of the beam.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2007年第3期110-115,128,共7页
Journal of Building Structures
基金
国家自然科学基金资助项目(50578083)
关键词
框架组合扁梁
受弯性能
试验研究
配筋率
深肋压型钢板
frame composite slim beam
flexural behavior
experimental study
ratio of reinforcement
deep deck
