本文選題：橋梁工程 + 壓彎性能��； 參考：《公路交通科技》2017年12期

【摘要】：為研究某特大跨雙索面混凝土斜拉橋因火災(zāi)致強(qiáng)受扭損傷的混凝土箱梁能否修復(fù)使用,對強(qiáng)受扭損傷加固后主梁的壓彎剛度、扭轉(zhuǎn)剛度及抗彎極限承載力開展了模型試驗研究,評估灌漿-錨鋼加固對主梁的壓彎剛度及扭轉(zhuǎn)剛度的影響。依據(jù)常用規(guī)范公式對箱梁抗彎極限承載力及正常使用極限狀態(tài)下的變形、裂縫特征進(jìn)行驗算,評估規(guī)范中相應(yīng)計算公式的適用性,并對加固箱梁在壓彎荷載作用下的破壞形態(tài)進(jìn)行對比分析。結(jié)果表明:灌漿-錨鋼加固能有效地提高彎扭剪復(fù)合受力下箱梁的壓彎剛度及扭轉(zhuǎn)剛度;在壓彎荷載作用下,加固梁的最終破壞形態(tài)為箱梁底板拉裂至鋼筋屈服破壞,頂板混凝土沒有被壓潰,腹板錨貼鋼板基本無損壞,但頂板錨貼鋼板與混凝土界面發(fā)生了剝離現(xiàn)象,鋼絞線未被拉斷;GB50010—2010、JTG D62—2012、ACI318M-05規(guī)范均能較為準(zhǔn)確地計算箱梁的抗彎極限承載力,ACI318M-05規(guī)范計算試驗梁在正常使用極限狀態(tài)下的跨中撓度值與實測值較為接近,基本能反映預(yù)應(yīng)力混凝土箱梁正常使用極限狀態(tài)下的變形性能;GB50010—2010規(guī)范計算試驗梁的最大裂縫寬度和裂縫間距與實測值均較為接近,基本能反映預(yù)應(yīng)力混凝土大比例縮尺箱梁的裂縫特性。
[Abstract]:In order to study whether the concrete box girder with strong torsional damage caused by fire can be repaired or used in a long-span double-cable plane concrete cable-stayed bridge, a model test study has been carried out on the compression and bending stiffness, torsional stiffness and ultimate flexural capacity of the main girder strengthened by strong torsional damage. The effect of grouting-anchor steel reinforcement on the bending stiffness and torsional stiffness of the main beam was evaluated. According to the commonly used code formula, the bending ultimate bearing capacity of box girder and the deformation and crack characteristics of box girder under the limit state of normal use are checked and calculated, and the applicability of the corresponding calculation formula in the code is evaluated. The failure modes of the strengthened box girder under the load of compression and bending are compared and analyzed. The results show that grouting and anchor steel reinforcement can effectively improve the bending stiffness and torsional stiffness of the box girder under the combined bending and torsional shear forces, and the ultimate failure mode of the strengthened beam under compression and bending loads is that the bottom plate of the box girder is cracked to the yield of the steel bar. The concrete of roof is not crushed, and the steel plate of web anchor is not damaged, but the interface between the steel plate and concrete is peeled off. The code of JTG D62-2012ACI318M-05 can calculate the ultimate flexural capacity of box girder accurately. ACI318M-05 code can calculate the deflection value of the test beam in the normal service limit state, which is close to the measured value. The deformation performance of prestressed concrete box girder can be basically reflected under the limit state of normal use. The maximum crack width and crack spacing of the test beam calculated in GB50010-2010 code are close to the measured values. It can basically reflect the crack characteristics of prestressed concrete large scale box girder.
【作者單位】： 長沙理工大學(xué)土木與建筑學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展規(guī)劃(九七三計劃)項目(2015CB057706) 國家自然科學(xué)基金項目(51678068,51678070)
【分類號】：U441;U445.72

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本文編號：2090950