【摘要】：為了解預(yù)加力對預(yù)應(yīng)力混凝土橋梁抗彎剛度的影響程度,針對預(yù)應(yīng)力混凝土結(jié)構(gòu)開裂前后受拉區(qū)纖維抗拉能力有顯著差異的特點(diǎn),同時(shí)考慮到無黏結(jié)預(yù)應(yīng)力混凝土梁的可重復(fù)張拉和試驗(yàn)數(shù)據(jù)的可比性,設(shè)計(jì)制作了2片無黏結(jié)預(yù)應(yīng)力混凝土試驗(yàn)梁,詳細(xì)測試在鋼絞線位置、面積不變,不同預(yù)加力對無黏結(jié)預(yù)應(yīng)力混凝土構(gòu)件開裂前后控制截面應(yīng)力和位移變化的影響。試驗(yàn)結(jié)果表明:對于未損傷的無黏結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu),預(yù)加力的變化對結(jié)構(gòu)抗彎剛度影響不顯著,但對于已經(jīng)開裂的無黏結(jié)預(yù)應(yīng)力混凝土,預(yù)加力的變化對結(jié)構(gòu)抗彎剛度有非常顯著的影響;研究成果可為今后舊橋安全評估和加固設(shè)計(jì)、有關(guān)規(guī)范的完善,以及預(yù)應(yīng)力混凝土干接梁推廣實(shí)施提供參考。
[Abstract]:In order to understand the influence of prestress on the flexural stiffness of prestressed concrete bridges, there are significant differences in fiber tensile capacity of prestressed concrete structures before and after cracking. At the same time, considering the comparability of repeatable tension and test data of unbonded prestressed concrete beams, two unbonded prestressed concrete test beams are designed and manufactured. The effect of different prestressing forces on stress and displacement of unbonded prestressed concrete members before and after cracking. The experimental results show that, for undamaged unbonded prestressed concrete structures, the change of prestressing force has no significant effect on the flexural stiffness of the structure, but for unbonded prestressed concrete which has cracked, the effect of prestressing force on the flexural stiffness of unbonded prestressed concrete structures is not significant. The change of prestressing force has a significant effect on the flexural stiffness of the structure. The research results can be used as a reference for the safety assessment and reinforcement design of old bridges, the improvement of relevant codes, and the popularization and implementation of prestressed concrete dry joint beams in the future.
【作者單位】： 山西省交通科學(xué)研究院橋梁工程防災(zāi)減災(zāi)山西省重點(diǎn)實(shí)驗(yàn)室;山西省交通科學(xué)研究院黃土地區(qū)公路建設(shè)與養(yǎng)護(hù)技術(shù)交通行業(yè)重點(diǎn)實(shí)驗(yàn)室;長安大學(xué)公路學(xué)院;
【基金】：山西省交通科技計(jì)劃項(xiàng)目(2013-1-06,2016-1-22)
【分類號】：U446.1

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