本文選題：波形鋼腹板　切入點：橫向分布系數(shù)　出處：《西南交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：箱梁截面具有良好的抗彎和抗扭性能,將混凝土腹板替換成波形鋼腹板,不僅可以減輕自重,而且提高了預應力利用率。波形鋼腹板箱梁良好的受力性能,使其在中小跨徑梁橋中得到廣泛應用,出于施工、寬度以及美觀要求,山區(qū)橋梁和城市橋梁多采用多箱單室截面。鑒于此,本文結合波形鋼腹板的受力特征,對多箱單室橋梁的荷載橫向分布系數(shù)展開了研究,主要的工作包括：1、采用剛性橫梁法和剛接梁法計算現(xiàn)有波形鋼腹板箱梁橋的跨中截面的荷載橫向分布系數(shù),并利用有限元方法對以上兩種方法的適用性進行驗證,驗證結果表明,剛性橫梁法具有較大誤差。利用杠桿原理法計算支座截面處的荷載橫向分布系數(shù),通過與有限元相對比,杠桿法適用于波形鋼腹板箱梁支座處橫向分布系數(shù)計算。2、采用有限元方法研究了橫向分布系數(shù)沿跨度的變化規(guī)律,結果表明,對于波形鋼腹板簡支箱梁橋,支點處橫向分布系數(shù)需要利用杠桿法計算,1/32L-31/32L之間截面可以近似取跨中截面代替,從支點到1/32L之間截面呈直線過渡。3、基于能量變分法,考慮波形鋼腹板箱梁的約束扭轉效應,推導得到荷載橫向分布影響線的計算公式。并建立空間有限元模型對理論公式進行驗證,結果表明理論公式具有較高的精度。4、利用推導公式與有限元計算結合的方法,研究分析了波折形狀、橫隔板間距、板厚以及腹板傾角對橫向分布系數(shù)的影響。波折形狀參數(shù)對橫向分布系數(shù)的影響較小；橫隔板可以使橫向分布更均勻,并可以減小截面的畸變效應；板厚的增加可以有效提高截面抗扭剛度,減小主梁的橫向分布系數(shù)；腹板傾角的變化主要影響頂?shù)装鍖挾?且腹板傾斜對提高抗扭剛度有利,從而影響抗扭性能和橫向分布系數(shù)。
[Abstract]:The section of box girder has good flexural and torsional properties. Replacing concrete web with corrugated steel web can not only reduce the weight of the box girder, but also improve the utilization ratio of prestressing force. It is widely used in medium and small span girder bridges. In order to meet the requirements of construction, width and beauty, multi-box single-chamber sections are used in mountain and urban bridges. In view of this, this paper combines the mechanical characteristics of corrugated steel webs. In this paper, the load transverse distribution coefficient of multi-box single-chamber bridge is studied. The main work includes the calculation of load transverse distribution coefficient of the middle section of the existing corrugated steel web box girder bridge by using the rigid beam method and the rigid-connected beam method, the main work of which is to calculate the load transverse distribution coefficient of the middle section of the existing corrugated steel box girder bridge. The applicability of the above two methods is verified by the finite element method. The results show that the rigid beam method has great error. The transverse load distribution coefficient at the support section is calculated by the lever principle method, and the results are compared with the finite element method. The lever method is applicable to the calculation of transverse distribution coefficient at the support of corrugated steel web box girder. The variation law of the transverse distribution coefficient along the span is studied by using finite element method. The results show that, for the simple box girder bridge with corrugated steel web, The transverse distribution coefficient at the fulcrum needs to be calculated by lever method between 1 / 32L-31-1 / 32L cross-section can be approximately replaced by mid-span section, and the cross-section from fulcrum to 1/ 32L is a straight line transition. Based on the energy variation method, the constrained torsional effect of corrugated steel web box girder is considered. The formula for calculating the influence line of transverse load distribution is derived, and the theoretical formula is verified by establishing the spatial finite element model. The results show that the theoretical formula has a high precision of .4.The method of combining the derived formula with the finite element calculation is used. The effects of the shape of the corrugated plate, the spacing of the transverse partition, the thickness of the plate and the inclination angle of the web plate on the transverse distribution coefficient are studied and analyzed. The influence of the shape parameters of the corrugated shape on the transverse distribution coefficient is small, and the transverse partition can make the transverse distribution more uniform. It can also reduce the distortion effect of the section, increase the thickness of the plate can effectively increase the torsional stiffness of the section and decrease the transverse distribution coefficient of the main beam, the change of the inclination angle of the web mainly affects the width of the top and bottom plate, and the inclination of the web plate is beneficial to the improvement of the torsional stiffness. Thus the torsional resistance and transverse distribution coefficient are affected.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U448.213

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