發(fā)布時(shí)間：2018-02-10 13:28

  本文關(guān)鍵詞： 橋梁工程 正交異性板鋼橋 有限元分析 弧形切口 疲勞車模型　出處：《中國(guó)公路學(xué)報(bào)》2017年03期 　論文類型：期刊論文

【摘要】：為研究貨運(yùn)繁重公路上某正交異性鋼橋面弧形切口開裂現(xiàn)象,基于動(dòng)態(tài)稱重系統(tǒng)(WIM)得到了疲勞車模型,并建立了鋼箱梁節(jié)段模型和橋面板子模型,開展了該鋼橋弧形切口應(yīng)力響應(yīng)分析和疲勞壽命評(píng)估。研究表明:橫隔板弧形切口的應(yīng)力局部效應(yīng)非常明顯,其橫橋向應(yīng)力影響線長(zhǎng)度在2個(gè)縱肋范圍左右,縱橋向應(yīng)力影響線長(zhǎng)度在2個(gè)橫隔板范圍左右;弧形切口僅能分辨軸組,而不能分辨軸組內(nèi)單軸,因而1輛疲勞車加載可以在弧形切口產(chǎn)生2個(gè)大應(yīng)力幅,分別對(duì)應(yīng)中間雙聯(lián)軸和后面的三聯(lián)軸;弧形切口在最小凈截面處存在顯著應(yīng)力集中,周圍存在明顯的應(yīng)力梯度,越靠近弧形切口邊緣,應(yīng)力梯度越明顯,其最大主應(yīng)力方向與實(shí)橋開裂形態(tài)相符;面內(nèi)應(yīng)力顯著主導(dǎo)弧形切口應(yīng)力響應(yīng),橫隔板存在一定的面外變形,適當(dāng)增加橫隔板的厚度,可有效降低弧形切口應(yīng)力水平;考慮輪載橫橋向分布,縱肋R18和R19之間的弧形切口疲勞壽命為6~13年,這與實(shí)橋弧形切口疲勞開裂時(shí)間和位置均比較吻合;貨車通行比例高、通行量大和超載嚴(yán)重是導(dǎo)致該橋過早出現(xiàn)疲勞開裂的主要原因;提出的實(shí)測(cè)疲勞車模型能為貨運(yùn)繁重公路上的鋼橋,特別是正交異性鋼橋面板疲勞設(shè)計(jì)和評(píng)價(jià)提供重要的參考。
[Abstract]:As an orthotropic steel bridge deck cracking phenomenon of heavy arc incision on the highway freight, dynamic weighing system based on (WIM) the fatigue car model, and a model is established and the bridge deck board girder segment model, carry out the steel arc incision stress response analysis and fatigue life evaluation. The results show that: the diaphragm arc incision local stress effect is very obvious, the transverse stress influence line length in 2 longitudinal range around the longitudinal stress influence line length in the 2 range of diaphragm; arc incision can only distinguish axis group, and cannot distinguish axis within the group of single axis, so the 1 car car fatigue loading can 2 high stress amplitude in the curved incision triple axis corresponding to intermediate shaft and double back arc incision in the smallest; the net section has significant stress concentration, obvious stress gradient around, the more close to the arc cut edge should be The stress gradient is more obvious, the maximum principal stress direction should be consistent with the bridge crack shape; stress significantly dominant arc incision stress response, the diaphragm has certain surface deformation, appropriate increase of diaphragm thickness, can effectively reduce the arc incision stress level; considering the load transverse distribution of curved incision fatigue the life between the longitudinal ribs and R19 R18 for 6~13 years, and the real bridge arc incision fatigue cracking time and location are in good agreement; a high proportion of truck traffic, traffic and a large amount of serious overload is the main cause of premature fatigue cracking of the bridge; the measured fatigue truck model is put forward for heavy freight on the highway bridge in particular, provides an important reference for the orthotropic steel deck fatigue design and evaluation.

【作者單位】： 湖南大學(xué)土木工程學(xué)院;佛山市路橋建設(shè)有限公司;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(“九七三”計(jì)劃)項(xiàng)目(2015CB057701) 國(guó)家自然科學(xué)基金項(xiàng)目(51278191) 湖南省交通科技項(xiàng)目(201522)
【分類號(hào)】：U441.4

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