基于突变理论的单根锚杆脱黏分析

发布时间：2018-04-16 18:05

本文选题：脱黏 + 临界松动位移　；参考：《岩土力学》2016年10期

【摘要】：针对工程中单根预应力锚杆的脱黏失效问题,基于突变理论提出一种研究的新思路。在建立简化力学模型的基础上,推导出锚固界面的非线性剪切滑移模型;视预应力锚杆为弹性体,根据弹性理论得出锚杆的总势能;引入突变理论,将锚杆势函数化简为尖点突变模型的标准形式,构建锚杆失效的临界判据,并进行脱黏分析。结果表明:所建非线性剪切滑移模型可以合理考虑锚固界面的软化特性;拉拔荷载作用下,锚杆杆体与周围注浆体的界面剪应力分布逐渐演化为单峰曲线,直至极限状态下整个锚固界面发生软化破坏;推导出的临界松动位移理论公式简单实用,可为研究单根预应力锚杆的脱黏失效提供参考。通过对工程算例进行验算分析,证明所提方法是合理可行的。
[Abstract]:Aiming at the problem of debonding failure of single prestressed anchor rod in engineering, a new idea of research based on catastrophe theory is put forward.Based on the simplified mechanical model, the nonlinear shear slip model of the Anchorage interface is derived. The total potential energy of the anchor is obtained according to the elastic theory, and the catastrophe theory is introduced.The anchor potential function is simplified as the standard form of the cusp catastrophe model, and the critical criterion for the failure of the bolt is constructed, and the debonding analysis is carried out.The results show that the softening characteristics of the Anchorage interface can be reasonably considered in the nonlinear shear slip model, and the shear stress distribution between the bolt body and the surrounding grouting body gradually evolves into a single peak curve under pull-out load.The theoretical formula of critical loosening displacement is simple and practical, which can provide a reference for studying the debonding failure of single prestressed anchor rod.It is proved that the proposed method is reasonable and feasible by checking and analyzing the engineering examples.
【作者单位】：郑州大学土木工程学院;河南理工大学土木工程学院;
【基金】：河南理工大学青年基金(No.672511/118)~~
【分类号】：TU476

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