预制混凝土梁湿接缝环形钢筋搭接长度研究

发布时间：2018-05-24 10:58

本文选题：预制混凝土梁 + 湿接缝　；参考：《公路》2015年12期

【摘要】：分析了一般钢筋搭接和环形钢筋搭接的传力机理,指出环形钢筋搭接的实质为环形钢筋通过搭接段钢筋间核心混凝土柱自锁锚固,通过核心混凝土柱抗剪而非钢筋与混凝土的黏结作用平衡搭接钢筋拉力,与PBL键通过孔间混凝土柱抗剪承载的机理类似。借鉴PBL键单孔承载力计算经验数据,以单剪切面核心混凝土柱抗剪承载力与环形钢筋抗拉承载力等强为控制条件,建立了环形钢筋搭接的长度计算公式。算例表明,核心混凝土截面足够时,环形钢筋搭接长度受钢筋直线段最小间距为零的构造要求控制,搭接承载力与搭接区钢筋采用绑扎或焊接等连接形式无关。试验证明,对于常用厚度的装配式预制梁湿接缝,建议的公式是合理的,并具有工程所需的精度。
[Abstract]:This paper analyzes the force transfer mechanism of lapped and annular reinforcement, and points out that the essence of lapping is self-locking anchoring of ring steel bar through the core concrete column between the overlapped steel bars. The shear resistance of the core concrete column is similar to that of the PBL key through the interhole concrete column through the shear resistance of the core concrete column but not the bond between the reinforcement and the concrete. Based on the empirical data of single hole bearing capacity of PBL bond and taking the strength of shear bearing capacity of single shear plane core concrete column and tensile bearing capacity of ring steel bar as control conditions, a formula for calculating the length of lap joint of ring steel bar is established. The calculation results show that when the section of core concrete is sufficient, the lap length of ring steel bar is controlled by the minimum spacing of the straight section of the steel bar, and the lap bearing capacity is independent of the connection form of the steel bar in the lap area, such as binding or welding. The experimental results show that the proposed formula is reasonable and has the required accuracy for the wet joints of prefabricated beams with common thickness.
【作者单位】：中交第二公路勘察设计研究院有限公司;
【分类号】：U445.57

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