连续梁负弯矩钢筋分批切断时延伸长度试验研究  

Experimental Study on the Extended Length of Negative Reinforcement Cut-in Phases in Continuous Beams

作　　者：邹昭文[1] 傅剑平[1] 白绍良[1] 

机构地区：[1]重庆建筑大学建筑工程学院

出　　处：《重庆建筑大学学报》1996年第2期10-19,共10页Journal of Chongqing Jianzhu University

摘　　要：通过对６个足尺约束梁正负弯矩过渡段和两个悬臂段的静力试验，研究了负弯矩钢筋分批切断时延伸段的受力性能。在对延伸段上钢筋应变分布进行细致测定的基础上，结合对斜裂缝发展状况及规律的考察，分析了不同剪跨比下钢筋延伸段的受力特点，获得了一系列新的认识。发现现行设计规范规定的延伸长度在剪跨比大时取值不足，剪跨比小时又裕量较大，为分批切断钢筋时延伸长度的合理取值提供了理论和试验依据。In this paper through the static loading tests of 6 inflexion zones and 2 cantilever zones in full-size constrained R/C beams, the stress performance in rebars cut-in-phases and subjected to negative moment is studied. The stress properties of extended length of rebars with different shear-span ratiosare analysed on basis of the full measurement of strain distributions combined with the investigation on state and regularity of the diagonal cracks development and series of new knowledge are obtained. It is found that current Concrete Design Code provisions on the extended length are inadequate for the high shear-span ratio and superfluous for the low shear-span ratio. The theoretical and experimental foundations are provided for determining proper value of extended length for rebars cut-in-phases.

关 键 词：钢筋混凝土 连续梁 延伸长度 试验 

分 类 号：TU375.103[建筑科学—结构工程]