钢筋混凝土连续梁中负弯矩钢筋分批切断延伸长度的试验研究  

Experimental Research on Development Lengths of Negative Reinforcements in Batches in Reinforced Concrete Continuous Beams

作　　者：白绍良[1] 傅剑平[1] 邹昭文[1] 

机构地区：[1]重庆建筑大学,重庆400045

出　　处：《建筑结构学报》1998年第6期40-49,共10页Journal of Building Structures

摘　　要：本文完成了负弯矩钢筋分两批切断的六根足尺约束梁和两根足尺悬臂梁的弯曲破坏试验。通过对各批钢筋延伸长度上应变分布的精确量测,研究了在不同的负弯矩区相对长度下,斜裂缝分布及粘结锚固效应对钢筋分批切断延伸长度的要求,给出了有试验依据的负弯矩钢筋分批切断延伸长度的确定方法。对比表明,我国现行国家标准GBJ 10-89规定的方法对负弯矩区相对长度较大的连续梁和悬臂梁偏不安全,建议作相应修正。This paper performed a flexural test of 6 full-scale continuous beams and 2 full-scale cantilever beams with development lengths of negative reinforcements in two batches. Through the precise measurement of strain distribution along the development lengths, the diagonal crack distribution and the requirement of bond anchorage effect by development reinforcements in batches with different relative lengths in the negative moment zone have been investigated. A determination method for development lengths of negative reinforcements in batches is suggested on the basis of experimental results. It is found by comparison that the provisions for reinforcement cut off in batches in the current Chinese Design Code for Concrete Structures cannot fully guarantee the flexural capacity of members, especially in cantilever beam when the relative length in negative moment zone is large. Finally, suggestions for code revision are given in the paper.

关 键 词：连续梁 负弯矩钢筋 延伸长度 切断 钢筋混凝土梁 

分 类 号：TU375.101[建筑科学—结构工程]