發(fā)布時(shí)間：2018-05-19 00:26

  本文選題：鋼筋混凝土橋墩 + 塑性鉸長(zhǎng)度��； 參考：《土木工程學(xué)報(bào)》2016年02期

【摘要】：基于橋墩極限位移三分量模型,從彎曲、剪切和縱筋滑移變形等三方面分析了橋墩塑性鉸長(zhǎng)度的主要影響參數(shù);通過40個(gè)圓形鋼筋混凝土橋墩試驗(yàn)數(shù)據(jù)的分析,建議了橋墩塑性鉸長(zhǎng)度的理論公式及經(jīng)驗(yàn)公式;并對(duì)建議及各規(guī)范的塑性鉸長(zhǎng)度公式進(jìn)行了模型橋墩、足尺橋墩和實(shí)橋橋墩的驗(yàn)證。結(jié)果表明:鋼筋混凝土橋墩塑性鉸長(zhǎng)度主要隨墩高、截面高度、材料特性參數(shù)(fydb/fc')及縱筋率的增大而增大,與軸壓比、配箍率等關(guān)系不大;與試驗(yàn)結(jié)果相比,就平均意義而言,各國(guó)規(guī)范塑性鉸長(zhǎng)度計(jì)算結(jié)果偏于安全,但均有較大的離散性,日本JRA規(guī)范最為保守,中國(guó)《公路橋梁抗震設(shè)計(jì)細(xì)則》(JTG/T B02-01—2008)較美國(guó)Caltrans規(guī)范及歐洲Eurocode8規(guī)范保守;建議的塑性鉸長(zhǎng)度理論公式與日本JRA規(guī)范相當(dāng),建議的塑性鉸長(zhǎng)度經(jīng)驗(yàn)公式在平均意義上與美國(guó)Caltrans規(guī)范及歐洲Eurocode8規(guī)范一致,但具有較小的變異系數(shù)和較高的保證率,優(yōu)于其他公式。
[Abstract]:Based on the three-component model of ultimate displacement of bridge pier, the main parameters influencing the length of plastic hinge of pier are analyzed from three aspects of bending, shear and slip deformation of longitudinal reinforcement, and the experimental data of 40 circular reinforced concrete piers are analyzed. The theoretical and empirical formulas for the length of plastic hinge of piers are suggested, and the model piers, full-scale piers and solid bridge piers are verified. The results show that the length of plastic hinge of reinforced concrete pier increases with the increase of pier height, cross-section height, material characteristic parameter and longitudinal reinforcement ratio, and has little relation with axial compression ratio and hoop ratio. The calculation results of plastic hinge length in various countries are on the side of safety, but they all have greater discreteness. The Japanese JRA code is the most conservative, and China's "detailed rules for Seismic Design of Highway Bridges" (JTG / T B02-01-2008) is more conservative than the American Caltrans Code and the European Eurocode8 Code. The proposed theoretical formula of plastic hinge length is equivalent to that of the Japanese JRA code. The suggested empirical formula of plastic hinge length is consistent with the American Caltrans Code and the European Eurocode8 Code in average sense, but has a smaller coefficient of variation and a higher guarantee rate. It is superior to other formulas.
【作者單位】： 廣西壯族自治區(qū)交通規(guī)劃勘察設(shè)計(jì)研究院;招商局重慶交通科研設(shè)計(jì)院有限公司橋梁結(jié)構(gòu)動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;重慶交通大學(xué);
【基金】：國(guó)家自然科學(xué)基金(NSFC;51478072) 國(guó)家國(guó)際科技合作專項(xiàng)(2011DFA83300)
【分類號(hào)】：U443.22;U442.55

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