PDF全文阅读

马德胜¹ , 陈明杰¹ , 凌跃跃¹ , 张建东^2,3

 

(1. 宁波市鄞州区交产集团有限责任公司 , 宁波    315199;

2. 南京工业大学 土木工程学院 , 南京   211816;

3. 苏交科集团股份有限公司 , 南京   210019)

摘  要: 为揭示预应力筋配置对键齿接缝抗剪性能的影响规律 。采用数值分析与试验相结合的方法开展研究 。建立单键齿和双键齿干接缝三维有限元模型 , 并通过既有试验的极限承载力 、剪应力—位移曲线及破坏模式对模型进行验证; 在此基础上 , 考虑预应力筋材料 、直径和数量等参数 , 分析预应力筋轴向刚度及配筋率对键齿接缝抗剪承载力的影响 , 并基于 AASHTO 键齿接缝抗剪承载力公式建立配筋率修正关系 ; 进一步开展三节段预应力键齿连接混凝土盖梁四点弯曲试验进行验证 。结果标明 : 有限元结果与试验结果总体吻合 ; 随着预应力筋轴向刚度和配筋率增大 , 键齿接缝抗剪承载力逐渐提高 , 当配筋率低于 5%时 , 其抗剪承载力约为 AASHTO计算值的 60% , 随着配筋率增大 , 两者差异逐渐减小 ; 修正公式对文献试件的预测偏差控制在 10% 以内 , 盖梁试验中修正公式预测值与实测值偏差约 5%。预应力筋轴向刚度及配筋率是影响键齿接缝抗剪承载力的重要因素 , 在低配筋率条件下考虑预应力筋配置影响 , 可减小 AASHTO 公式对键齿接缝抗剪承载力的预测偏差。

关键词: 键齿接缝 ; 预应力配筋率 ; 抗剪承载力 ; 数值仿真 ; 模型试验

中图分类号: U443. 35      文献标志码: A      文章编号: 1005-8249 (2026) 05-0160-09

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 05. 024

 

MA Desheng¹ , CHEN Mingjie¹ , LING Yueyue¹ , ZHANG Jiandong^2,3

(1. Ningbo Yinzhou District Transportation Industry Group Co. , Ltd. , Ningbo 315199, China;

2. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China;

3. JSTI Group Co. , Ltd. , Nanjing 210019, China)

Abstract : To investigate the influence of prestressing reinforcement configuration on the shear performance of keyed joints. Three-dimensional finite element models of single- and double-keyed dry joints were established and validated using existing test results. The effects of prestressing reinforcement material, diameter, axial stiffness, and reinforcement ratio were analyzed, and a modified AASHTO-based shear-capacity formula was proposed. A four-point bending test on a three-segment prestressed concrete cap beam with keyed joints was conducted for further verification.  The numerical results agreed well with the test results. The shear capacity increased with increasing axial stiffness and reinforcement ratio. When the reinforcement ratio was below 5% , the shear capacity was about 60% of the AASHTO prediction. The prediction error of the modified formula was within 10% , and the deviation for the cap-beam test was about 5%. Prestressing reinforcement configuration significantly affects the shear capacity of keyed joints, and considering its effect under low reinforcement-ratio conditions can reduce the overestimation of the AASHTO formula.

Key words: prestressing reinforcement ratio; shear capacity; numerical simulation; experimental verification

 作者简介 : 马德胜 (1978—) , 男, 本科, 高级工程师, 研究方向 : 结构工程。

收稿日期 : 2025-10-24