本文選題：鋼桁腹 + 組合梁橋��； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：本文以鋼桁腹-混凝土組合梁為研究對(duì)象,對(duì)其基本力學(xué)性能、撓度計(jì)算理論、橫截面剪滯效應(yīng)及偏載效應(yīng)等進(jìn)行了系統(tǒng)的分析與研究工作,為鋼桁腹-混凝土組合梁橋的推廣應(yīng)用提供理論基礎(chǔ)。采用有限元方法對(duì)鋼桁腹-混凝土組合梁的基本力學(xué)性能進(jìn)行分析與研究。結(jié)果表明,在荷載作用下,鋼桁腹-混凝土組合梁的變形不能忽略剪切變形的影響：鋼桁腹-混凝土組合梁的截面彎矩主要由混凝土頂、底板承擔(dān),剪力則主要由鋼桁腹桿的豎向分力承擔(dān)。基于鋼桁腹-混凝土組合梁的力學(xué)特性,結(jié)合換算薄壁箱梁法,推導(dǎo)了鋼桁腹-混凝土組合梁的變形控制微分方程,并給出了典型邊界條件與荷載工況下鋼桁腹-混凝土組合梁撓度計(jì)算的理論公式；分析了寬跨比、懸翼比、寬高比等結(jié)構(gòu)幾何參數(shù)對(duì)理論公式的影響,給出了撓度理論公式的適用范圍,并驗(yàn)證了該范圍內(nèi)理論公式的計(jì)算精度。對(duì)承受跨中集中荷載、兩點(diǎn)對(duì)稱(chēng)荷載與均布荷載等三種典型荷載作用的鋼桁腹-混凝土組合梁撓度進(jìn)行了分析,并與有限元計(jì)算結(jié)果進(jìn)行了比較分析,結(jié)果表明：本文推導(dǎo)的鋼桁腹-混凝土組合梁撓度計(jì)算理論公式與有限元結(jié)果吻合較好,驗(yàn)證了本文假設(shè)的鋼桁腹-混凝土組合梁理論計(jì)算模型的正確性與合理性。分析了三種典型荷載作用下的剪滯效應(yīng)特點(diǎn)；比較了不同結(jié)構(gòu)體系下鋼桁腹-混凝土組合梁的剪滯效應(yīng)。計(jì)算結(jié)果表明,簡(jiǎn)支鋼桁腹-混凝土組合梁橋在全橋范圍內(nèi),混凝土頂、底板橫向正應(yīng)力均呈現(xiàn)不均勻分布的現(xiàn)象,部分截面出現(xiàn)負(fù)剪滯現(xiàn)象,不包含節(jié)點(diǎn)的斷面在支座附近的剪滯效應(yīng)比較明顯：連續(xù)鋼桁腹-混凝土組合梁,在均布荷載作用下,近中支座附近截面的負(fù)剪滯效應(yīng)十分突出,在設(shè)計(jì)時(shí)需十分重視�；诩魷�(yīng)的分析結(jié)果,計(jì)算了鋼桁腹-混凝土組合梁的有效分布寬度,并與規(guī)范計(jì)算結(jié)果進(jìn)行了比較。結(jié)果表明,采用規(guī)范法計(jì)算簡(jiǎn)支鋼桁腹-混凝土組合梁的有效寬度比較保守。分析了寬跨比、寬高比、翼厚比等結(jié)構(gòu)幾何參數(shù)對(duì)鋼桁腹-混凝土組合梁剪滯系數(shù)的影響,結(jié)果表明：寬跨比對(duì)鋼桁腹-混凝土組合梁剪滯系數(shù)具有較大的影響,而寬高比和翼厚比對(duì)剪滯系數(shù)的影響不大。對(duì)活載作用下鋼桁腹-混凝土組合梁的正應(yīng)力偏載效應(yīng)進(jìn)行了分析,結(jié)果表明,與普通混凝十箱梁相比,鋼桁腹-混凝土組合梁的偏載效應(yīng)顯著,對(duì)此類(lèi)梁進(jìn)行抗扭設(shè)計(jì)時(shí)應(yīng)對(duì)正應(yīng)力偏載系數(shù)經(jīng)驗(yàn)值適當(dāng)放大。采用等效腹板法分析了鋼桁腹-混凝土組合梁的偏載系數(shù),并給出了等效板厚的計(jì)算公式,可為鋼桁腹-混凝土組合梁的偏載效應(yīng)研究提供參考。
[Abstract]:In this paper, the basic mechanical properties, deflection calculation theory, cross section shear lag effect and eccentric load effect of steel truss concrete composite beams are systematically analyzed and studied. It provides a theoretical basis for the popularization and application of steel truss-concrete composite beam bridge. The basic mechanical properties of steel truss-concrete composite beams are analyzed and studied by finite element method. The results show that the deformation of steel-truss belt-concrete composite beams can not ignore the influence of shear deformation under load: the cross-section bending moment of steel-truss belt-concrete composite beams is mainly borne by the concrete roof and the bottom slab. The shear force is mainly borne by the vertical force of the steel truss web member. Based on the mechanical properties of steel truss belt-concrete composite beam and the method of conversion thin-walled box girder, the deformation control differential equation of steel truss belt-concrete composite beam is derived. The theoretical formulas for deflection calculation of steel truss belt-concrete composite beams under typical boundary conditions and load conditions are given, and the effects of structural geometric parameters such as width to span ratio, hanging wing ratio and width to height ratio on the theoretical formula are analyzed. The application range of deflection theoretical formula is given, and the calculation accuracy of the theoretical formula in this range is verified. The deflection of steel truss below-concrete composite beams subjected to three typical loads, such as concentrated load, two-point symmetrical load and uniform load, is analyzed, and the results are compared with those of finite element method. The results show that the theoretical formula of deflection of steel truss concrete composite beams derived in this paper is in good agreement with the finite element results, which verifies the correctness and rationality of the theoretical calculation model of steel truss web concrete composite beams assumed in this paper. The characteristics of shear lag effect under three typical loads are analyzed, and the shear lag effects of steel truss belt-concrete composite beams under different structural systems are compared. The calculation results show that the transverse normal stress of the concrete roof and bottom slab of the simply supported steel truss belt-concrete composite girder bridge is unevenly distributed in the whole span of the bridge, and the negative shear lag occurs in some sections. The shear lag effect of the section without joints near the bearing is obvious: the negative shear lag effect near the middle support section is very prominent under the uniform distribution load of continuous steel truss belt-concrete composite beam, which should be paid more attention to in the design. Based on the analysis results of shear lag effect, the effective distribution width of steel truss concrete composite beams is calculated and compared with the calculated results of the code. The results show that the effective width of simply supported steel truss-concrete composite beams calculated by the code method is conservative. The effects of structural geometric parameters, such as width to span ratio, width to height ratio and wing to thickness ratio, on shear lag coefficient of steel truss web concrete composite beam are analyzed. The results show that the width span ratio has great influence on shear lag coefficient of steel truss web concrete composite beam. The ratio of width to height and the ratio of wing to thickness have little effect on the shear lag coefficient. The effect of normal stress deflection on steel truss web concrete composite beam under live load is analyzed. The results show that the deflection effect of steel truss web concrete composite beam is significant compared with that of common concrete box girder. The experimental value of normal stress deflection coefficient should be enlarged properly when torsional design of this kind of beam is carried out. The deflection load coefficient of steel truss belt-concrete composite beam is analyzed by using the equivalent web method, and the calculation formula of equivalent slab thickness is given, which can be used as a reference for the study of the deflection effect of steel truss belt-concrete composite beam.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441

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