【摘要】：為準(zhǔn)確檢測錨下預(yù)應(yīng)力大小,研發(fā)了預(yù)應(yīng)力鋼絞線錨下有效預(yù)應(yīng)力測試系統(tǒng),基于等效剛度理論揭示了系統(tǒng)的工作機(jī)理,針對(duì)兩類情況分別提出了張拉力的判別準(zhǔn)則,解釋了張拉力與延伸量關(guān)系的特征曲線.研究結(jié)果表明:張拉力與延伸量的關(guān)系曲線分為消除非彈性變形階段、反拉段彈性變形階段及反拉段和錨固段協(xié)同受力階段;根據(jù)張拉力-延伸量曲線出現(xiàn)"拐點(diǎn)"和未出現(xiàn)"拐點(diǎn)"兩種情況分別提出判別準(zhǔn)則,"拐點(diǎn)識(shí)別法"可用于錨下有效預(yù)應(yīng)力測試,實(shí)際工作張拉力與測試張拉力誤差不超過3%;錨下有效預(yù)應(yīng)力測試評(píng)定標(biāo)準(zhǔn)需考慮預(yù)應(yīng)力損失.
[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.
【作者單位】： 山東大學(xué)巖土與結(jié)構(gòu)工程研究中心;山東交通學(xué)院土木工程學(xué)院;山東省路橋集團(tuán);
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51108249) 山東省高等學(xué)校科技計(jì)劃項(xiàng)目(J15LG02)
【分類號(hào)】：TU378

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