施工期钢绞线锚下有效预应力测试技术

doi:10.12068/j.issn.1005-3026.2017.08.028

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (8): 1201-1205.DOI: 10.12068/j.issn.1005-3026.2017.08.028

施工期钢绞线锚下有效预应力测试技术

张峰¹，高磊¹，徐向锋²，曹原³

(1. 山东大学岩土与结构工程研究中心，山东济南250061; 2. 山东交通学院土木工程学院，山东济南250023；3. 山东省路桥集团，山东济南250021)

收稿日期:2016-04-15 修回日期:2016-04-15 出版日期:2017-08-15 发布日期:2017-08-12
通讯作者: 张峰
作者简介:张峰(1978-)，男，江苏泰兴人，山东大学副教授，博士.
基金资助:
国家自然科学基金资助项目(51108249)；山东省高等学校科技计划项目(J15LG02).

Testing Technology of Under-Anchorage Effective Prestress of Steel Strand in Construction Period

ZHANG Feng¹， GAO Lei¹， XU Xiang-feng²， CAO Yuan³

1.Geotechnical and Structural Engineering Research Center， Shandong University， Jinan 250061， China; 2.Department of Civil Engineering， Shandong Jiaotong University， Jinan 250023， China; 3. Shandong Luqiao Group， Jinan 250021， China.

Received:2016-04-15 Revised:2016-04-15 Online:2017-08-15 Published:2017-08-12
Contact: GAO Lei
About author:-
Supported by:
-

摘要/Abstract

摘要： 为准确检测锚下预应力大小，研发了预应力钢绞线锚下有效预应力测试系统，基于等效刚度理论揭示了系统的工作机理，针对两类情况分别提出了张拉力的判别准则，解释了张拉力与延伸量关系的特征曲线.研究结果表明:张拉力与延伸量的关系曲线分为消除非弹性变形阶段、反拉段弹性变形阶段及反拉段和锚固段协同受力阶段;根据张拉力-延伸量曲线出现“拐点”和未出现“拐点”两种情况分别提出判别准则，“拐点识别法”可用于锚下有效预应力测试，实际工作张拉力与测试张拉力误差不超过3%;锚下有效预应力测试评定标准需考虑预应力损失.

关键词: 锚下有效预应力, 施工期, 等效刚度, 测试系统, 判别准则

Abstract: To accurately detect under-anchorage effective prestress， a test system for prestressed steel strand was developed and its working mechanism was revealed based on the equivalent stiffness theory. A specific criterion of tension for two kinds of situations was given and the tension-elongation characteristic curve was explained. Results show that tension-elongation curve can be divided into inelastic deformation eliminating section， elastic deformation of the reverse stretching section and co-work of both reverse stretching section and anchorage section. Specific tension criterion can be given according to whether there exists an inflection point in the tension-elongation curve， which can be used for detecting under-anchorage effective prestress. The error between actual working tension and the tested tension is less than 3%. It is suggested that the prestress loss should be considered in the evaluation standard of under-anchorage effective prestress.

Key words: under-anchorage effective prestress, construction period, equivalent stiffness, test system, criterion

中图分类号:

TU378.8

张峰，高磊，徐向锋，曹原. 施工期钢绞线锚下有效预应力测试技术[J]. 东北大学学报:自然科学版, 2017, 38(8): 1201-1205.

ZHANG Feng， GAO Lei， XU Xiang-feng， CAO Yuan. Testing Technology of Under-Anchorage Effective Prestress of Steel Strand in Construction Period[J]. Journal of Northeastern University Natural Science, 2017, 38(8): 1201-1205.

参考文献

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施工期钢绞线锚下有效预应力测试技术

Testing Technology of Under-Anchorage Effective Prestress of Steel Strand in Construction Period

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