本文選題：橋梁工程　切入點：鋼箱梁橫隔板　出處：《中國公路學報》2017年03期

【摘要】：針對壓-壓循環(huán)可不驗算疲勞、橫隔板弧形切口母材疲勞為面外反復變形所致、《公路鋼結(jié)構(gòu)橋梁設計規(guī)范》(JTG D64—2015)(以下簡稱《公路鋼橋規(guī)》)疲勞損傷效應系數(shù)取值等認知或規(guī)定,以及服役背景工程橫隔板弧形切口處補強細節(jié)尺寸的確定,通過服役背景工程的疲勞細節(jié)、交通載荷與病害特征等信息匯集,服役背景工程多種補強方案、新建背景工程等輪載有限元分析與多規(guī)范疲勞驗算比較,力求揭示橫隔板弧形切口母材疲勞開裂機理,確定其合理的補強細節(jié)。研究結(jié)果表明:橫隔板弧形切口處母材的輪載應力主要為膜壓應力,輪載壓應力幅耗費橫隔板母材疲勞壽命;《公路鋼橋規(guī)》疲勞損傷效應系數(shù)取值或許偏大;弧形切口形狀對橫隔板與U肋連接處及橫隔板母材輪載應力及其峰值影響較大,弧形切口半徑不能太小,且其與U肋交點的切線與U肋腹板的夾角宜取小值;橫隔板母材裂紋較短者(優(yōu)化后,裂紋自然切除)可采用"弧形切口優(yōu)化"的處治方案,較長者可采用"止裂孔+弧形切口優(yōu)化+雙面補強鋼板"的處治方案;補強鋼板對補強以外稍遠部位應力影響可忽略,補強鋼板尺寸可統(tǒng)一,其邊緣距頂板可取65mm,已覆蓋裂紋全長,其邊緣距U肋宜取30mm,太近會導致橫隔板與U肋連接焊縫處應力增大,其厚度宜取4mm,過厚將在補強鋼板邊緣處母材上形成新的疲勞敏感點。
[Abstract]:Fatigue can not be checked in the pressure-pressure cycle.The fatigue of the base material of the transverse partition arc notch is caused by repeated deformation outside the plane, the Code for Design of Highway Steel structure Bridges, JTG D64-2015 (hereinafter referred to as "Highway Steel Bridge Regulation"), and so on.As well as the determination of the size of reinforcement details at the arc incision of the transverse diaphragm in the service background engineering. Through the collection of fatigue details, traffic load and disease characteristics of the service background engineering, various reinforcement schemes of the service background engineering are obtained.In order to reveal the fatigue cracking mechanism of the base material of arc incision of transverse partition plate and determine the reasonable reinforcement details, the finite element analysis of iso-wheel load and the fatigue checking calculation of multi-code are compared in this paper.The results show that the wheel load stress of the base metal at the arc notch of the transverse diaphragm is mainly membrane compressive stress, and the amplitude of the wheel load stress consumes the fatigue life of the transverse diaphragm, and the fatigue damage effect coefficient of the highway steel bridge gauge may be too large.The shape of arc notch has a great influence on the stress and peak value of wheel load of transverse diaphragm and U rib, the radius of arc cut can't be too small, and the angle between the tangent line and U rib web should be small.The treatment scheme of "arc notch optimization" can be adopted in the case of short crack in the base metal of the transverse partition (after optimization, the natural excision of the crack), and the treatment scheme of "the arc-shaped notch of the stop hole to optimize the reinforcing steel plate on both sides" can be adopted by the elder.The effect of reinforcing steel plate on the stress of a little further place outside the reinforcement can be neglected. The size of the reinforcing steel plate can be unified. The edge distance from the roof can be 65mm and the crack is covered in the whole length.The edge should be 30 mm away from the U rib, which will cause the stress to increase at the weld joint between the transverse diaphragm and the U rib, and the thickness should be 4 mm. If the thickness is too thick, a new fatigue sensitive point will be formed on the base metal at the edge of the reinforcing steel plate.
【作者單位】： 長沙理工大學橋梁工程安全控制教育部重點實驗室;
【基金】：國家自然科學基金項目(51308070) 國家重點基礎研究發(fā)展計劃(“九七三”計劃)項目(2015CB057701,2015CB057702) 湖南省研究生科研創(chuàng)新項目(CX2016B396) 橋梁工程安全控制教育部重點實驗室開放基金項目(16BCX12)
【分類號】：U441.4

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本文編號：1704814