【摘要】：箱梁與其他橋型相比較,因其良好的抗扭性能等優(yōu)點(diǎn),使得其在橋梁建設(shè)中使用最為廣泛。但在同等情況下對(duì)比其他橋型,箱梁受剪力滯效應(yīng)的破壞程度最為顯著,而且這是工程界一直都未解決的難題。隨著社會(huì)交通的快速發(fā)展,受使用功能、環(huán)境、造價(jià)等因素的影響,箱梁截面的設(shè)計(jì)需要不斷地完善優(yōu)化,而截面的優(yōu)化設(shè)計(jì)可以減輕剪力滯效應(yīng)的影響�；诖�,本文依托于河北省研究生創(chuàng)新基金項(xiàng)目“鋼筋混凝土剪力滯效應(yīng)的研究”(項(xiàng)目編號(hào):213),以簡(jiǎn)支箱梁為研究對(duì)象,探討了其幾何截面積不變,截面特性對(duì)跨中截面剪力滯效應(yīng)的影響。本課題的研究完成了以下工作:1,本文進(jìn)行了有機(jī)玻璃模型試驗(yàn)研究,對(duì)簡(jiǎn)支箱梁受跨中集中荷載時(shí),其跨中截面剪力滯系數(shù)受截面幾何特性影響的變化規(guī)律,進(jìn)行了深入的探討和研究。2,對(duì)32米簡(jiǎn)支箱梁在《高速鐵路設(shè)計(jì)規(guī)范TB 10621-2014》中的“ZK標(biāo)準(zhǔn)活載”工況進(jìn)行了計(jì)算,對(duì)其跨中截面剪力滯系數(shù)、翼板與腹板的縱向剪切應(yīng)力的變化規(guī)律進(jìn)行了詳細(xì)的分析。3,對(duì)簡(jiǎn)支箱梁在移動(dòng)荷載下,其跨中截面剪力滯系數(shù)、撓度和截面正應(yīng)力的變化規(guī)律進(jìn)行了研究。4,本文對(duì)簡(jiǎn)支箱梁在地震作用下,其跨中截面剪力滯系數(shù)、撓度和截面正應(yīng)力的變化規(guī)律進(jìn)行了研究。5,對(duì)簡(jiǎn)支箱梁受跨中集中荷載時(shí),能量變分法計(jì)算剪力滯系數(shù)的公式進(jìn)行了優(yōu)化分析,并給出最優(yōu)計(jì)算方法。通過本課題的研究,為后人提供了一種研究思路:由于實(shí)際情況需要對(duì)簡(jiǎn)支箱梁截面進(jìn)行優(yōu)化設(shè)計(jì)時(shí),如何更好地減小剪力滯效應(yīng)造成的影響,但又要兼顧橋梁的其他力學(xué)行為,從而優(yōu)化箱梁的截面設(shè)計(jì),對(duì)于我國橋梁設(shè)計(jì)與建設(shè)具有重要意義。
[Abstract]:Compared with other bridge types, box girder is widely used in bridge construction because of its good torsion resistance and other advantages. But under the same condition, the damage degree of box girder subjected to shear lag effect is the most significant, and this is a difficult problem which has not been solved by the engineering field. With the rapid development of social transportation, the design of box girder section needs to be improved and optimized, and the optimum design of the section can reduce the influence of shear lag effect due to the influence of the function of use, the environment, the cost of the box girder and so on. Based on this, this paper is based on the research of reinforced concrete shear lag effect (Project No.: 213), which is a project of Hebei Provincial Graduate Innovation Foundation, and takes simply supported box girder as the research object, and discusses its geometric cross-sectional area invariance. The effect of cross section characteristics on shear lag effect of cross section. The research of this subject has completed the following work: 1. In this paper, the model tests of plexiglass have been carried out. The variation law of shear lag coefficient of simply supported box girder subjected to the concentrated load in the middle of span is influenced by the geometric characteristics of the cross section. In this paper, the "ZK standard live load" working condition of 32-meter simply supported box girder in TB 10621-2014 is calculated, and the shear lag coefficient of the mid-span section of the box girder is calculated. The variation law of longitudinal shear stress of wing plate and web plate is analyzed in detail. The shear lag coefficient of span section of simply supported box girder under moving load is analyzed in detail. The variation law of deflection and normal stress of section is studied in this paper. In this paper, the shear lag coefficient, deflection and normal stress of span section of simply supported box girder under seismic action are studied. 5. When simply supported box girder is subjected to concentrated load in span, the variation law of shear lag coefficient, deflection and normal stress of cross section are studied in this paper. The formula of calculating shear lag coefficient by energy variational method is optimized and the optimal calculation method is given. Through the research of this subject, it provides a research idea for future generations: how to reduce the influence of shear lag effect better when the section of simply supported box girder needs to be optimized for the actual situation. However, it is of great significance for bridge design and construction to optimize the cross-section design of box girder by taking into account other mechanical behaviors of bridges.
【學(xué)位授予單位】：河北建筑工程學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441

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本文編號(hào)：2260279