PC箱梁橋施工及成橋剪力滯特性研究
本文選題:連續(xù)梁 切入點:剪力滯效應(yīng) 出處:《湖南科技大學(xué)》2015年碩士論文 論文類型:學(xué)位論文
【摘要】:大跨徑預(yù)應(yīng)力混凝土箱形連續(xù)或剛構(gòu)橋多采用自平衡施工工藝,其剛度和荷載隨著懸臂施工進程逐步形成,因此剪力滯效應(yīng)必須考慮施工過程的累積效果。與此同時,目前剪力滯的研究多數(shù)沒有考慮荷載橫向作用位置產(chǎn)生的影響。本文旨在對PC箱梁橋自平衡施工累計剪力滯效應(yīng)以及成橋汽車荷載橫向變位對剪力滯特性的影響進行系統(tǒng)的理論分析和實測研究。通過理論、實測以及有限元對比分析,得到的主要內(nèi)容和成果如下:1、采用廣義力與廣義位移的概念,對箱梁頂板、懸臂板、底板分設(shè)不同的剪力滯廣義縱向位移,采用二次拋物線作為翼板的翹曲位移函數(shù),運用能量變分原理,建立了箱梁剪力滯控制微分方程。算例分析顯示荷載橫向變位對箱梁剪力滯效應(yīng)基本沒有影響,而對承載位置的縱向應(yīng)力分布影響很大。2、基于腹板剪切變形修正箱梁剪力滯翹曲位移函數(shù),統(tǒng)一全截面廣義位移,運用能量變分法建立箱梁彎曲剪力滯控制微分方程。以微分方程的齊次通解為一維剪力滯梁段單元的位移模式,建立了單元剛度方程,演算了單元剛度矩陣與荷載列陣計算式,在此基礎(chǔ)上采用Fortran語言編制了計算程序,建立了一種考慮腹板剪切變形的剪力滯效應(yīng)有限梁段模型。算例分析表明考慮腹板剪切變形的單剪滯位移算法比按傳統(tǒng)鐵木辛柯梁考慮平均剪切變形的三剪滯位移算法的精度高,特別是使得主梁變形更加接近塊體元模型。3、通過有限梁段模型、Midas FEA塊體元模型以及現(xiàn)場采集的試驗數(shù)據(jù)分析,歸納出連續(xù)梁施工過程剪力滯效應(yīng)的一般規(guī)律以及汽車荷載橫向變位對箱梁剪力滯產(chǎn)生的影響,驗證了理論算法在工程實際運用中的準確性和可操作性。
[Abstract]:Long span prestressed concrete box continuous or rigid frame bridges adopt self-balanced construction technology, and their stiffness and load are gradually formed with the cantilever construction process, so the effect of shear lag must be taken into account in the process of construction. At present, most of the researches on shear lag do not take into account the influence of the transverse position of load. The purpose of this paper is to study the accumulative shear lag effect of PC box girder bridge in self-balance construction and the influence of the lateral displacement of vehicle load on shear lag characteristic of the bridge. To carry out systematic theoretical analysis and practical research. The main contents and results obtained are as follows: 1. By using the concept of generalized force and generalized displacement, different shear lag generalized longitudinal displacements of box girder roof plate, cantilever plate and bottom plate are established. The quadratic parabola is used as the warping displacement function of the wing plate, and the governing differential equation of the box girder shear lag is established by using the energy variational principle. The analysis of the example shows that the lateral displacement of the load has no effect on the shear lag effect of the box girder. However, the longitudinal stress distribution of the bearing position is greatly affected. Based on the web shear deformation, the shear lag warpage displacement function of the box girder is corrected, and the generalized displacement of the whole section is unified. The differential equation of bending shear lag control of box girder is established by energy variational method. The element stiffness equation is established by taking the homogeneous general solution of differential equation as the displacement model of one-dimensional shear lag beam, and the element stiffness matrix and load matrix are calculated. On this basis, the calculation program is compiled by using Fortran language. In this paper, a finite beam segment model with shear lag effect considering web shear deformation is established. An example analysis shows that the single shear lag displacement algorithm considering web shear deformation is better than the traditional Timuxinko beam with three shear hysteretic positions considering average shear deformation. The accuracy of the shift algorithm is high, In particular, the deformation of the main beam is closer to that of the block element model. 3. Through the finite beam segment model, the Midas FEA block element model and the experimental data collected in the field are analyzed. The general law of shear lag effect during construction of continuous beam and the influence of lateral displacement of vehicle load on shear lag of box girder are summarized. The accuracy and maneuverability of the theoretical algorithm in engineering practice are verified.
【學(xué)位授予單位】:湖南科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:U441;U448.213
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