【摘要】：在考慮預(yù)應(yīng)力損失和二次受力的情況下,對預(yù)應(yīng)力CFRP布加固鋼筋混凝土梁,推導(dǎo)了撓度和裂縫寬度的計算公式,并基于改進的蒙特卡羅法和等效線性化方法進行了撓度和裂縫寬度的可靠度計算�？煽慷扔嬎憬Y(jié)果表明,當(dāng)預(yù)應(yīng)力損失從500με增加到4000με時,裂縫寬度的可靠指標(biāo)從7.78減小到0.97;撓度的可靠指標(biāo)從4.09減小到3.96;預(yù)應(yīng)力損失對裂縫寬度可靠指標(biāo)的影響更加顯著。在未充分卸荷、CFRP布截面面積較小或CFRP布彈性模量較低時,更易加劇裂縫寬度的可靠指標(biāo)隨預(yù)應(yīng)力損失增加而降低的趨勢。為防止因預(yù)應(yīng)力損失而影響梁的正常使用,建議采用預(yù)應(yīng)力CFRP布加固鋼筋混凝土梁時,盡可能卸荷;選用CFRP布截面面積時,尚應(yīng)考慮正常使用階段的功能要求,可適當(dāng)增加CFRP布的截面面積;同時為了在正常使用階段充分發(fā)揮CFRP布的高強特性,可選擇較高彈性模量的CFRP布。
[Abstract]:Considering the loss of prestress and secondary stress, the formulas for calculating deflection and crack width of reinforced concrete beams strengthened with prestressed CFRP sheets are derived. The reliability of deflection and crack width is calculated based on the improved Monte Carlo method and equivalent linearization method. The reliability calculation results show that when the loss of prestress increases from 500 渭 蔚 to 4 000 渭 蔚, the reliability index of crack width decreases from 7.78 to 0.97, and the reliability index of deflection decreases from 4.09 to 3.96. The influence of prestressing loss on the reliability index of crack width is more obvious. When the section area of CFRP distribution is smaller or the elastic modulus of CFRP cloth is lower, the reliable index of crack width is more likely to worsen with the increase of prestress loss, the reliable index of crack width decreases with the increase of prestress loss. In order to prevent the loss of prestress to affect the normal use of the beam, it is suggested that when the reinforced concrete beam is strengthened with prestressed CFRP sheets, the load should be unloaded as much as possible. When the section area of CFRP cloth is selected, the functional requirements of normal service stage should be taken into account, and the section area of CFRP cloth can be increased appropriately. At the same time, in order to give full play to the high strength characteristics of CFRP cloth during the normal use stage, the CFRP cloth with higher elastic modulus can be selected.
【作者單位】： 西南大學(xué);武漢大學(xué);
【基金】：國家自然科學(xué)基金(51208078)
【分類號】：TU375.1

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