本文關(guān)鍵詞：基于應(yīng)變能的縱肋與橫肋連接多軸疲勞評(píng)估方法　出處：《中國(guó)公路學(xué)報(bào)》2016年12期 　論文類型：期刊論文

  更多相關(guān)文章： 橋梁工程 正交異性鋼橋面板 應(yīng)變能密度 壽命評(píng)估方法 疲勞性能 多軸效應(yīng) 縱肋與橫肋連接構(gòu)造

【摘要】：為準(zhǔn)確評(píng)估正交異性鋼橋面板結(jié)構(gòu)中縱肋與橫肋連接構(gòu)造的疲勞性能,從疲勞開(kāi)裂的本質(zhì)特征出發(fā),以改進(jìn)的應(yīng)變能密度為參量,考慮多軸效應(yīng)對(duì)疲勞性能的影響,推導(dǎo)并建立了基于改進(jìn)的應(yīng)變能密度疲勞性能評(píng)估方法,評(píng)估了焊接復(fù)雜部位在多軸應(yīng)力狀態(tài)下的疲勞性能。在此基礎(chǔ)上,針對(duì)縱肋與橫肋連接部位,以港珠澳大橋正交異性鋼橋面板足尺節(jié)段模型疲勞試驗(yàn)為研究背景,將模型試驗(yàn)結(jié)果與所推導(dǎo)的公式計(jì)算結(jié)果進(jìn)行對(duì)比,驗(yàn)證提出方法的適用性和準(zhǔn)確性。研究結(jié)果表明:對(duì)于正交異性鋼橋面板而言,縱肋與橫肋連接構(gòu)造部位為典型的多軸受力狀態(tài),多軸效應(yīng)對(duì)其疲勞性能的影響不可忽略;計(jì)算所得單軸應(yīng)變能密度略小于理論值,只考慮單軸效應(yīng)對(duì)該部位進(jìn)行疲勞壽命評(píng)估會(huì)導(dǎo)致偏于不安全的結(jié)果;而以總的彈性應(yīng)變能密度為參量,將導(dǎo)致計(jì)算結(jié)果偏大,壽命評(píng)估結(jié)果偏于保守;基于多軸應(yīng)力的改進(jìn)能量法計(jì)算結(jié)果與理論值能較好吻合,且最大相對(duì)誤差為9.7%;所提方法能適用于正交異性鋼橋面板橫肋與U肋連接部位疲勞性能評(píng)估。
[Abstract]:In order to accurately evaluate the fatigue performance of the orthotropic steel deck structure of longitudinal ribs and transverse rib connecting structure, starting from the essential characteristics of the fatigue cracking, in order to improve the strain energy density parameter, considering the influence of performance of multi axis fatigue effect, establishes an improved evaluation method of fatigue strain energy density is derived and evaluated based on performance. Welding fatigue performance under stress in multi axis complex parts. On this basis, the longitudinal ribs and transverse rib joints, with HZMB orthotropic steel deck full-scale segmental model fatigue test as the research background, the model test and the formula derived by comparing the calculation results and applicability to verify the accuracy of this method. The results show that the orthotropic steel deck, longitudinal ribs and transverse rib connecting structure parts of multi axis stress state of the typical multi axis effect on the fatigue performance Can not be ignored; the calculated uniaxial strain energy density is slightly less than the theoretical value, only consider the effect of uniaxial fatigue life of the site assessment will lead to unsafe results; and to the total elastic strain energy density as parameters will lead to the calculation result is too large, life assessment is more conservative than the results; good agreement with the theoretical value calculated by modified energy method based on multi axial stress, and the maximum relative error is 9.7%; the proposed method can be applied to orthotropic steel deck transverse ribs and U rib connecting parts fatigue performance evaluation.

【作者單位】： 西南交通大學(xué)土木工程學(xué)院;
【基金】：“十二五”國(guó)家科技支撐計(jì)劃項(xiàng)目(2011BAG07B03) 國(guó)家自然科學(xué)基金項(xiàng)目(51178394,51578455) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2682014CX078)
【分類號(hào)】：U441.4
【正文快照】： 0引言正交異性鋼橋面板在整體力學(xué)性能、適用性、經(jīng)濟(jì)性和加工制造特性等方面優(yōu)點(diǎn)突出,已經(jīng)成為大跨度橋梁的首選橋面板結(jié)構(gòu)。其性能由結(jié)構(gòu)體系、加工制造條件和服役期外界環(huán)境所決定,疲勞問(wèn)題是制約正交異性鋼橋面板應(yīng)用和發(fā)展的重要因素,準(zhǔn)確評(píng)估疲勞性能是正交異性鋼橋面板

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本文編號(hào)：1362806