【摘要】：先簡支后連續(xù)梁橋兼有簡支梁橋和連續(xù)梁橋的優(yōu)點,因此在高等級公路中,特別是中、小跨徑橋梁中應(yīng)用越來越廣。該類橋梁設(shè)計中橫向分布系數(shù)的計算方法有：修正剛性橫梁法、剛接梁法、鉸接梁法等傳統(tǒng)方法和有限元分析法,傳統(tǒng)方法簡化條件較多,計算精度不高,而有限元分析法建模復(fù)雜、計算工作量大,因此開展先簡支后連續(xù)小箱梁橋荷載橫向分布系數(shù)計算的研究非常必要。本文以長湘高速公路金州立交橋為依托,主要研究內(nèi)容如下：1.闡述了先簡支后連續(xù)小箱梁橋的受力特點和國內(nèi)外“荷載橫向分布”的研究現(xiàn)狀。2.采用等代簡支板法將先簡支后連續(xù)梁橋(金州分離式立交橋)截面剛度等效轉(zhuǎn)化成簡支梁橋截面剛度后,分別采用修正剛性橫梁法、剛接梁法、鉸接梁法計算了該橋的跨中橫向分布系數(shù)。3.運用有限元軟件Midas建立了金州分離式立交橋的空間梁格計算模型,分析計算了該橋的荷載橫向分布系數(shù),將計算結(jié)果與傳統(tǒng)計算方法的結(jié)果比較可得：四跨五梁式的先簡支后連續(xù)小箱梁跨中橫向分布計算采用剛接梁法計算較為合適,并建議將剛接梁法的計算結(jié)果適當提高,邊梁(1號梁)提高7%,2號梁提高2%,3號梁提高1%。4.進行了金州立交橋的動、靜載試驗,結(jié)果表明該橋的受力性能良好,滿足設(shè)計規(guī)范要求；該橋于2013年12月通車,運營良好；并將試驗結(jié)果與傳統(tǒng)方法、有限元法的計算結(jié)果進行對比基本吻合,驗證了基于剛度等效的傳統(tǒng)方法和有限元分析法的正確性。
[Abstract]:The simple supported and then continuous beam bridges have the advantages of both simple supported beam bridges and continuous beam bridges, so they are more and more widely used in high grade highways, especially in medium and small span bridges. In the design of this kind of bridges, the calculation methods of transverse distribution coefficient are as follows: modified rigid beam method, hinged beam method and finite element analysis. The finite element analysis method is complex in modeling and heavy in calculation, so it is very necessary to study the calculation of load transverse distribution coefficient of simple support and then continuous small box girder bridge. Based on Jinzhou overpass of Changxiang Expressway, the main research contents are as follows: 1. This paper expounds the stress characteristics of simple supported and then continuous small box girder bridges and the research status of "transverse load distribution" at home and abroad. 2. The section stiffness of the first supported and then continuous beam bridge (Jinzhou separated interchange bridge) is equivalent to the section stiffness of simply supported beam bridge by the method of equal-generation simply supported plate, and the modified rigid crossbeam method and the rigid-connected beam method are adopted respectively after the section stiffness of the bridge is transformed into the section stiffness of the simple supported beam bridge. The transverse distribution coefficient in the span of the bridge is calculated by hinge beam method. 3. 3. By using finite element software Midas, the spatial beam lattice calculation model of Jinzhou separated interchange bridge is established, and the load transverse distribution coefficient of the bridge is analyzed and calculated. By comparing the calculation results with those of the traditional method, it can be concluded that the method of rigid connection beam is more suitable for the calculation of transverse distribution of four-span and five-beam box girders with simple support and continuous small box girders, and it is suggested that the calculation results of rigid-connected beam method should be improved appropriately. The side beam (beam 1) increased by 7, the second beam increased by 2, and the third beam increased by 1. 4. The dynamic and static load tests of Jinzhou overpass are carried out. The results show that the bridge has good mechanical performance and meets the requirements of the design code, and the bridge was opened to traffic in December 2013 and operated well. The experimental results are compared with those of the traditional method and the finite element method, which verify the correctness of the traditional method based on stiffness equivalence and the finite element analysis method.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.2;U448.213
，

本文編號：2341948