预应力节段预制拼装梁接缝直剪承载力计算方法  

A Calculation Method for Direct Shear Bearing Capacity of Joints of Prestressed Precast Concrete Segmental Beams

作　　者：孙长军 宋守坛[2] SUN Changjun;SONG Shoutan(Liuzhou OVM Machinery Co.,Ltd,Liuzhou 545005,China;School of Civil Engineering,Southeast University,Nanjing 211102,China)

机构地区：[1]柳州欧维姆机械股份有限公司,广西柳州545005 [2]东南大学土木工程学院,南京211102

出　　处：《工业建筑》2024年第5期135-140,共6页Industrial Construction

基　　金：国家重点研发计划项目(2017YFC0703006-01);江苏省博士后科研资助计划项目(1601148B)。

摘　　要：对预应力混凝土节段预制拼装梁接缝直剪受剪承载力进行对比分析研究。通过对接缝直剪破坏的研究进行梳理总结,采用文献中的184个接缝直剪试验数据,对已有接缝承载力预测模型的准确性进行验证,并对不同类型接缝的抗剪强度进行对比。分析结果表明:多键齿接缝直剪承载力小于单键齿接缝,胶接单齿接缝承载力最高,干接多键齿接缝承载力最低,胶接平面接缝介于两者之间。美国节段桥梁规范计算式对干接单键齿接缝预测结果较好,干接多键齿预测结果偏于不安全。通过对比给出了建议的接缝承载力计算模型。接缝直剪承载力和规范最小抗剪截面承载力对比分析结果表明,按中国公路桥梁规范(JTG 3362—2018)设计的结构,截面高度小于5 m时,基本不会出现胶接键齿直剪破坏。A comparative analysis was conducted on the direct shear bearing capacity of the joints of prestressed precast concrete segmental beams.By sorting out and summarizing the research on direct shear failure of joints,using 184 direct shear test data of joints in the literature,the accuracy of the existing bearing capacity prediction model was verified,and the shear strengths of different joints were compared.The results showed that the direct shear bearing capacity of multi-keyed joints was lower than that of single-keyed joints,the shear bearing capacity of epoxy single-keyed joints was the highest,the shear bearing capacity of dry multi-keyed joints was the lowest,and the shear bearing capacity epoxy plane joints was between the above two.The calculation formula of AASHTO specification was good for predicting the dry single-keyed joints,but the prediction results of dry multi-keyed joints were not safe.A calculation model for the bearing capacity of joints was proposed through comparisons.Based on the comparison between the direct shear bearing capacity of joints and the bearing capacity of minimum shear section in codes,the analysis results show that for the structure designed according to JTG 3362-2018,when the section height is less than 5 m,there will be no direct shear failure of epoxy keyed joints.

关 键 词：节段预制拼装梁 直剪承载力 键齿接缝 预应力 最小受剪截面 

分 类 号：U442[建筑科学—桥梁与隧道工程]