混合配筋混凝土梁抗彎計(jì)算理論
發(fā)布時(shí)間:2018-03-12 22:08
本文選題:橋梁工程 切入點(diǎn):混合配筋 出處:《中國(guó)公路學(xué)報(bào)》2016年07期 論文類型:期刊論文
【摘要】:為了給混合配筋(混合配置FRP與鋼筋)混凝土梁的設(shè)計(jì)應(yīng)用提供參考,對(duì)已有抗彎承載力計(jì)算公式進(jìn)行了對(duì)比分析,并通過(guò)將理論值與試驗(yàn)值的對(duì)比,證明了各公式的精確性和有效性。通過(guò)改變混凝土強(qiáng)度、鋼筋強(qiáng)度、FRP筋種類、混凝土極限壓應(yīng)變以及有效配筋率等參數(shù),采用理論分析的方法討論了限定縱筋最大拉應(yīng)變對(duì)理論計(jì)算結(jié)果的影響。結(jié)果表明:已有混合配筋混凝土梁抗彎承載力計(jì)算公式均是基于平截面假定,根據(jù)截面內(nèi)應(yīng)變協(xié)調(diào)和力的平衡得出,均能很好地預(yù)測(cè)試驗(yàn)結(jié)果,誤差較小;但限定縱筋最大拉應(yīng)變后的理論值偏于安全,因此,推薦設(shè)計(jì)時(shí)采用限定縱筋最大拉應(yīng)變的混合配筋混凝土梁抗彎承載力計(jì)算公式。
[Abstract]:In order to provide a reference for the design and application of concrete beams with mixed reinforcement (mixed FRP and reinforced bar), the existing formulas for calculating the flexural capacity are compared and analyzed, and the theoretical values are compared with the experimental values. The accuracy and validity of the formulas are proved. By changing the parameters of concrete strength, reinforcement strength and FRP bars, the ultimate compressive strain of concrete and the effective reinforcement ratio, etc. The influence of the maximum tensile strain of longitudinal reinforcement on the theoretical calculation results is discussed by means of theoretical analysis. The results show that the existing formulas for calculating the flexural capacity of concrete beams with mixed reinforcement are based on the assumption of plane section. According to the strain coordination and force balance in the section, the experimental results can be predicted well and the error is small, but the theoretical value after the maximum tensile strain of the longitudinal tendons is limited to safety, so, The formula of flexural bearing capacity of mixed reinforced concrete beams with maximum tensile strain of longitudinal reinforcement is recommended for design.
【作者單位】: 同濟(jì)大學(xué)土木工程學(xué)院;中南建筑設(shè)計(jì)院股份有限公司;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(50178050) 上海市浦江人才計(jì)劃項(xiàng)目(12PJ1409000) 教育部高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金項(xiàng)目(20120072120008)
【分類號(hào)】:U441
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