超大跨徑UHPC連續(xù)箱梁橋扭轉(zhuǎn)畸變效應(yīng)研究
發(fā)布時間：2019-03-16 17:16
【摘要】：超大跨徑單向預(yù)應(yīng)力UHPC連續(xù)薄壁箱梁橋是利用UHPC材料的優(yōu)良抗壓、抗拉性能,采用薄壁型結(jié)構(gòu)、布置密集橫的隔板箱梁以及一部分體外預(yù)應(yīng)力三部分相結(jié)合的一種新型連續(xù)梁結(jié)構(gòu)。與傳統(tǒng)的連續(xù)梁橋比較,其具有跨越能力較大,自重比普通混凝土橋梁輕,穩(wěn)定性較強,后期的運營跨中徐變撓度較小,且易于維護(hù)和檢修等一系列優(yōu)點。但因為薄壁箱梁本身存在翹曲變形、彎扭變形、畸變等一些因素,其結(jié)構(gòu)受力分析較為復(fù)雜,因而近來年箱梁結(jié)構(gòu)的分析也在不斷發(fā)展。在大跨徑箱梁橋應(yīng)用研究方面中,有關(guān)箱梁扭轉(zhuǎn)畸變效應(yīng)的研究,近年愈加受到關(guān)注。在橋梁結(jié)構(gòu)的應(yīng)用研究中,源于箱梁薄壁化而產(chǎn)生的畸變效需引起重視。偏心荷載的作用下薄壁箱梁會產(chǎn)生:整體彎曲、剛性扭轉(zhuǎn)和截面畸變?nèi)N變形。實際工程設(shè)計通常采用在箱形梁內(nèi)部設(shè)置橫隔板的方法來降低箱梁畸變。針對超大跨徑UHPC連續(xù)薄壁箱梁橋,本文提出了密集橫隔板的布置方式。鑒于此,本文作者主要進(jìn)行了以下研究工作:(1)本文利用能量法的原理推導(dǎo)了箱梁以畸變角為變量的畸變微分方程,詳細(xì)介紹了荷載分解法,探討了以畸變角和畸變撓度兩種不同變量的微分方程之間的聯(lián)系互換性,比較了箱梁畸變微分方程與彈性地基梁微分方程的類似性。(2)設(shè)計制作UHPC雙懸臂梁模型,對比研究不同橫隔板數(shù)目的懸臂梁段在材料彈性下截面的抗扭轉(zhuǎn)畸變性能。通過試驗結(jié)果的對比考察密集橫隔板對的畸變應(yīng)力、豎向位移等的作用。試驗的結(jié)果表明:薄壁箱梁整體抗扭轉(zhuǎn)畸變性能強,密集橫隔板數(shù)量增加能提高截面抗扭轉(zhuǎn)畸變的能力,當(dāng)橫隔板從三塊增加到四塊后,扭轉(zhuǎn)畸變應(yīng)力下降了38%,豎向位移降幅為42%。(3)建立試驗梁的有限元模型,對試驗梁進(jìn)行數(shù)值分析,更加細(xì)致的考察結(jié)構(gòu)各方面的性能,深入分析橫隔板對扭轉(zhuǎn)畸變性能的影響,并與試驗結(jié)果相比較,結(jié)果表明二者吻合較好。結(jié)合試驗結(jié)果及有限元分析得到:UHPC密集橫隔板箱梁抗扭轉(zhuǎn)畸變性能強,密集橫隔板數(shù)量增加能夠降低扭轉(zhuǎn)畸變應(yīng)力和畸變角等參數(shù)。運用畸變角的大小來衡量箱梁畸變程度的指標(biāo),采用畸變角和橫隔板體積來間接反映結(jié)構(gòu)功能與造價之比,得出新型箱梁橋橫隔板間距為3m,同時考慮密集橫隔板比重(控制在總重15%以內(nèi))及施工的方便較優(yōu)的橫隔板間距取值范圍為3~6m。
[Abstract]:The super-span unidirectional prestressed UHPC continuous thin-walled box girder bridge is made use of the excellent compressive and tensile properties of UHPC material and adopts thin-walled structure. A new type of continuous beam structure, which is composed of densely spaced box girder and a part of external prestressing, is presented in this paper. Compared with the traditional continuous beam bridge, it has a series of advantages, such as larger span capacity, lighter self-weight than ordinary concrete bridge, stronger stability, smaller mid-span creep deflection in the later stage of operation, and is easy to maintain and repair and so on. However, because the thin-walled box girder itself has some factors, such as warpage, bending and torsion, distortion and so on, the structural stress analysis of the thin-walled box girder is more complicated, so the analysis of the box girder structure has been developing in recent years. In the application of long-span box girder bridge, more and more attention has been paid to the study of torsional distortion effect of box girder in recent years. In the application research of bridge structure, the distortion effect caused by thin-walled box girder needs to be paid more attention. Under eccentric load, thin-walled box girder will produce three kinds of deformation: integral bending, rigid torsion and cross-section distortion. In practical engineering design, the box girder distortion is reduced by setting the diaphragm inside the box girder. For the super-span UHPC continuous thin-walled box girder bridge, the arrangement of dense diaphragm is proposed in this paper. In view of this, the author of this paper mainly carried on the following research work: (1) in this paper, the distortion differential equation of box girder with distortion angle as variable is derived by using the principle of energy method, and the load decomposition method is introduced in detail. In this paper, the interchangeability between differential equations with distortion angle and distortion deflection is discussed, and the similarity between box beam distortion differential equation and elastic foundation beam differential equation is compared. (2) the UHPC double cantilever beam model is designed and fabricated. The torsional distortion resistance of cantilever beams with different number of diaphragm plates under elastic material is studied. The effects of distortion stress, vertical displacement and so on the dense transverse diaphragm are investigated by comparing the experimental results. The experimental results show that the overall anti-torsional distortion performance of thin-walled box girder is strong, and the capacity of anti-torsional distortion of cross-section can be improved by increasing the number of dense diaphragm plates. When the number of diaphragm plates increases from three to four, the torsional distortion stress decreases by 38%. The vertical displacement is reduced by 42%. (3) the finite element model of the test beam is established, and the numerical analysis of the test beam is carried out, the performance of the structure is investigated in detail, and the influence of the transverse diaphragm on the torsional distortion performance is deeply analyzed. And compared with the experimental results, the results show that the two are in good agreement. Combined with the experimental results and finite element analysis, it is found that the UHPC dense diaphragm box girder has strong torsional distortion resistance, and the increase of the number of dense diaphragm plates can reduce the torsional distortion stress and distortion angle and other parameters. The distortion angle is used to measure the distortion degree of box girder, and the distortion angle and transverse partition volume are used to indirectly reflect the ratio of structural function to cost. It is concluded that the spacing between the transverse diaphragms of the new box girder bridge is 3m, and that of the new type of box girder bridge is 3m. At the same time, considering the specific gravity of the dense diaphragm (controlled within 15% of the total weight) and the convenient and better spacing range of the diaphragm for construction is 3 m / 6 m.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441
本文編號：2441808
[Abstract]:The super-span unidirectional prestressed UHPC continuous thin-walled box girder bridge is made use of the excellent compressive and tensile properties of UHPC material and adopts thin-walled structure. A new type of continuous beam structure, which is composed of densely spaced box girder and a part of external prestressing, is presented in this paper. Compared with the traditional continuous beam bridge, it has a series of advantages, such as larger span capacity, lighter self-weight than ordinary concrete bridge, stronger stability, smaller mid-span creep deflection in the later stage of operation, and is easy to maintain and repair and so on. However, because the thin-walled box girder itself has some factors, such as warpage, bending and torsion, distortion and so on, the structural stress analysis of the thin-walled box girder is more complicated, so the analysis of the box girder structure has been developing in recent years. In the application of long-span box girder bridge, more and more attention has been paid to the study of torsional distortion effect of box girder in recent years. In the application research of bridge structure, the distortion effect caused by thin-walled box girder needs to be paid more attention. Under eccentric load, thin-walled box girder will produce three kinds of deformation: integral bending, rigid torsion and cross-section distortion. In practical engineering design, the box girder distortion is reduced by setting the diaphragm inside the box girder. For the super-span UHPC continuous thin-walled box girder bridge, the arrangement of dense diaphragm is proposed in this paper. In view of this, the author of this paper mainly carried on the following research work: (1) in this paper, the distortion differential equation of box girder with distortion angle as variable is derived by using the principle of energy method, and the load decomposition method is introduced in detail. In this paper, the interchangeability between differential equations with distortion angle and distortion deflection is discussed, and the similarity between box beam distortion differential equation and elastic foundation beam differential equation is compared. (2) the UHPC double cantilever beam model is designed and fabricated. The torsional distortion resistance of cantilever beams with different number of diaphragm plates under elastic material is studied. The effects of distortion stress, vertical displacement and so on the dense transverse diaphragm are investigated by comparing the experimental results. The experimental results show that the overall anti-torsional distortion performance of thin-walled box girder is strong, and the capacity of anti-torsional distortion of cross-section can be improved by increasing the number of dense diaphragm plates. When the number of diaphragm plates increases from three to four, the torsional distortion stress decreases by 38%. The vertical displacement is reduced by 42%. (3) the finite element model of the test beam is established, and the numerical analysis of the test beam is carried out, the performance of the structure is investigated in detail, and the influence of the transverse diaphragm on the torsional distortion performance is deeply analyzed. And compared with the experimental results, the results show that the two are in good agreement. Combined with the experimental results and finite element analysis, it is found that the UHPC dense diaphragm box girder has strong torsional distortion resistance, and the increase of the number of dense diaphragm plates can reduce the torsional distortion stress and distortion angle and other parameters. The distortion angle is used to measure the distortion degree of box girder, and the distortion angle and transverse partition volume are used to indirectly reflect the ratio of structural function to cost. It is concluded that the spacing between the transverse diaphragms of the new box girder bridge is 3m, and that of the new type of box girder bridge is 3m. At the same time, considering the specific gravity of the dense diaphragm (controlled within 15% of the total weight) and the convenient and better spacing range of the diaphragm for construction is 3 m / 6 m.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441
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