施工期钢绞线锚下有效预应力测试技术
发布时间：2019-03-25 21:45
【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.
[Abstract]:In order to detect the magnitude of prestressing force under anchor accurately, an effective prestressed testing system under prestressed strands anchor is developed. Based on the equivalent stiffness theory, the working mechanism of the system is revealed, and the criterion of tensile force is put forward for two kinds of cases respectively. The characteristic curve of the relationship between tensile force and elongation is explained. The results show that the relationship between tension and elongation is divided into three stages: elimination of inelastic deformation, elastic deformation of anti-tension and synergetic stress of anti-tension and anchoring. According to the "inflection point" and no "inflection point" of tension-extension curve, the criterion is put forward respectively. The "inflection point identification method" can be used in the test of effective prestress under anchor. The error between actual work tension and test tension is not more than 3%; The loss of prestress should be considered in the test and evaluation standard of effective prestress under anchor.
【作者单位】： 山东大学岩土与结构工程研究中心;山东交通学院土木工程学院;山东省路桥集团;
【基金】：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)
【分类号】：TU378
本文编号：2447348
[Abstract]:In order to detect the magnitude of prestressing force under anchor accurately, an effective prestressed testing system under prestressed strands anchor is developed. Based on the equivalent stiffness theory, the working mechanism of the system is revealed, and the criterion of tensile force is put forward for two kinds of cases respectively. The characteristic curve of the relationship between tensile force and elongation is explained. The results show that the relationship between tension and elongation is divided into three stages: elimination of inelastic deformation, elastic deformation of anti-tension and synergetic stress of anti-tension and anchoring. According to the "inflection point" and no "inflection point" of tension-extension curve, the criterion is put forward respectively. The "inflection point identification method" can be used in the test of effective prestress under anchor. The error between actual work tension and test tension is not more than 3%; The loss of prestress should be considered in the test and evaluation standard of effective prestress under anchor.
【作者单位】： 山东大学岩土与结构工程研究中心;山东交通学院土木工程学院;山东省路桥集团;
【基金】：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)
【分类号】：TU378
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