外文翻譯---芳綸纖維筋混凝土梁的抗彎效應(yīng)之?dāng)?shù)值研究-其他專業(yè)-資料下載頁
2025-01-19 09:43本頁面
【導(dǎo)讀】本文介紹了芳綸纖維筋混凝土梁的抗彎效應(yīng)。通過三維非線性有限元分析和迭代截面分。析及實(shí)驗(yàn)驗(yàn)證，預(yù)測芳綸纖維筋混凝土梁構(gòu)件預(yù)應(yīng)力性能?；炷亮簽楹喼Я汉蛦握{(diào)加載直。混凝土梁的截面性能為：配筋率％％，Ig/Icr比率25比77，其中Ig. /Icr分別為總慣性和打擊時(shí)刻慣性。實(shí)驗(yàn)對受測梁施予各種預(yù)應(yīng)力以評估荷載與位移的負(fù)荷。性軸和深度有顯著影響。諸如Ig/Icr比的斷面性能是影響鋼筋混凝土梁包括變形指數(shù)在內(nèi)的。變形特征的一項(xiàng)重要性能參數(shù)。文章還對改善現(xiàn)有設(shè)計(jì)方案提出了建議。增強(qiáng)聚酯混凝土是傳統(tǒng)的鋼筋結(jié)構(gòu)一種很有前景的替代品，廣泛用于民用。低、現(xiàn)場反應(yīng)快等優(yōu)點(diǎn)。受腐蝕破壞，導(dǎo)致混凝土構(gòu)件承載能力不足。為了減少了鋼材腐蝕，可能需要較高的維修費(fèi)。在持續(xù)荷載下鋼筋混凝土容易斷裂。特別值得一提的是，選定的梁包括Ig/Icr比。輕加強(qiáng)型（ρ＜％），Ig/Icr的比例高達(dá)77，這是芳綸纖維的典型應(yīng)用特點(diǎn)。上述發(fā)現(xiàn)有待更多的實(shí)驗(yàn)加以評估確認(rèn)。
【正文】 prestress level in AFRP tendons significantly influenced the cracking load of the beams, whereas no effect was found for the ultimate load due to the light reinforcing scheme ., tensioncontrolled section . The strain development of the AFRP was governed by the applied bending moment near the momentcritical region ., near midspan , rather than the prestress level that affected the strain development adjacent to the jacking end. When the Ig / Icr ratio decreased, prestress levels tended to in fluence the variation of the neutral axis depth, particularly for the service state. The present equation to pre dict the effective neutral axis depth may be used with an em pirical constant of 6 for AFRPprestressed members, rather than a value of 2 that is shown in the present provision, until a better expression is available. The present ACI440 equations to predict the effective moment of inertia were significantly influenced by the sectional prop erties of the beams, such as Ig / Icr ratios. The approach was reasonable for the beams with Ig / Icr = 25, whereas the approach overestimated the effective moment of inertia for the beams with Ig / Icr ratios greater than 55 so that stiff deflection predictions were achieved. The approach provided reasonable predictions for nonprestressed members 0% prestressing when the Ig / Icr ratio was less than The empirical equation proposed by Yost et al. 2021 showed good predictions for the effective moment of inertia, whereas the rationally derived Bischoff’s approach may have potential to be revised for FRPprestressed beams. The Ig / Icr ratio governed the deflection characteristics of the AFRP prestressed members until cracking occurred。 however, the prestress level was a more dominant factor at service state. The present provision of concerning the im provement of deformability ., reduce a prestress level in FRP tendons should be revised to include the critical deflec tion consideration. The research suggests that the prestress level for AFRP tendons be limited as low as 40% ultimate to satisfy the ACI318 deflection requirement. The approach showed consistent deformability indices irrespective of the sectional properties, whereas the CHBDC approach was significantly affected by the properties. The CHBDC approach may not be remended for a beam with high Ig / Icr ratios such as 77. A limit of the deformability index for the approach was suggested to be . More experimental evaluation may be remended to con firm the present findings. （ From： ）
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