Study on Initial Tension Load and Load Holding Time of Prestressed Steel Strand

被引：0
|
作者：
Xu X. [1 ]
Gao H. [2 ,3 ]
Ye J. [4 ]
Zhang F. [2 ]
Shen J. [1 ]
机构：
[1] Shandong Jiaotong University School of Civil Engineering, Jinan
[2] Shandong University Geotechnical and Structural Engineering Research Center, Jinan
[3] Shandong High-speed Construction Management Group Co. Ltd, Jinan
[4] Southeast University, School of Transportation, Nanjing
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2022年 / 30卷 / 04期
关键词：
Bridge engineering; Field test; Initial tension load; Prestress loss; Prestressed steel strand; Stabilized oil pressure time; Super-long prestressed steel strand;
D O I：
10.16058/j.issn.1005-0930.2022.04.018
中图分类号：
TU997 []; U44 [桥涵工程]; U24 [];
学科分类号：
0814 ; 081406 ;
摘要：
For the super-long prestressedsteel strand of long-span bridges, the existing codes cannot effectively control the initial stretch load and the load-holding time, and there is no unified evaluation standard for the load-holding time in the existing studies Fourteen extra-long prestressed strands of four long-span Bridges were subjected to step-by-step tensioning and load-holding tests. Combined with the test samples of 21 steel strand in existing literature, the initial stretching load determination of prestressed steel strand and the research on the duration of load-holding time were carried out. It is found that the initial stretching load and the load-holding time increase with the increase of the length of the prestressed strand.According to the experimental results, calculation formulas for determining the initial stretching load and load-holding time of prestressed steel are proposed. The method and calculation formula presented in this paper fit well with the field test results and can be used to guide the construction of super-long prestressed steel strand stretching. © 2022, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：1014 / 1027
页数：13
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