锚下有效预应力检测仪器研发及工程应用

发布时间：2018-01-31 04:38

本文关键词： 预应力钢绞线有效预应力拉脱法 LabVIEW软件平台同束离散度　出处：《中外公路》2017年05期 　论文类型：期刊论文

【摘要】：为了有效应用拉脱法测试技术测试预应力钢绞线锚下有效预应力,该文首先介绍了拉脱法的测试原理,研发了拉脱法的测试设备。测试设备由高频数据采集卡、油压传感器、高精度位移计及电动油泵组成。基于图形化软件平台LabVIEW,采用图形化设计语言G语言编制了测试程序,给出程序源代码。基于研究的软件和测试硬件,集成了拉脱法锚下有效预应力测试仪器(LTF 1.0)。基于测试仪器,开展了工程推广应用。研究结果表明:研究的测试仪器能够通过张拉力-延伸量曲线,有效地识别锚下有效预应力的大小;测试仪器(LTF1.0)具有精度高、安全性好及操作简便等优点;通过现场工程应用,现场检测的预应力钢绞线锚下有效张拉力合格率从54.4%提升至94.7%,同束离散度从10.2%降至1.7%。
[Abstract]:In order to test the effective prestress under the anchor of prestressed steel strands, this paper first introduces the testing principle of the pull-off method, and develops the testing equipment of the pull-off method, which is made up of high-frequency data acquisition card. Oil pressure sensor, high precision displacement meter and electric oil pump. Based on the graphic software platform LabVIEW, the test program is programmed by G language. The source code of the program is given. Based on the research software and the test hardware, the effective pre-stress testing instrument LTF 1.0 is integrated under the pull off anchor. The testing instrument is based on the test instrument. The research results show that the test instrument can effectively identify the effective prestressing force under the anchor by the tension-extension curve; LTF 1.0) has the advantages of high precision, good safety and easy operation. Through field engineering application, the qualified rate of effective tension under the anchor of prestressed steel strand tested in the field is raised from 54.4% to 94.7, and the dispersion of the same beam is reduced from 10.2% to 1.7.
【作者单位】：宁夏公路建设管理局;山东大学岩土与结构工程研究中心;
【基金】：国家自然科学基金资助项目(编号:51108249)
【分类号】：U446.3
【正文快照】： 预应力锚固技术广泛应用于边坡工程、桥梁工程及岩土加固工程中,预应力钢绞线的张拉质量与工程质量密切相关。对于桥梁工程,若锚下预应力过大,会导致梁体变形;若锚下预应力不足,则会引起梁底的开裂及梁体下挠,影响工程安全。因此,开展锚下有效预应力的检测十分必要。锚下预应

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