【摘要】：根據(jù)對(duì)大跨徑預(yù)應(yīng)力混凝土箱梁橋的病害調(diào)查可知,跨中下?lián)线^(guò)大和腹板斜裂縫問(wèn)題常常是“并發(fā)癥”。腹板斜裂縫是結(jié)構(gòu)性裂縫,屬于受剪基本理論范疇。目前,國(guó)內(nèi)外已有的混凝土受剪性能試驗(yàn)均偏重于承載力研究,對(duì)于斜裂縫出現(xiàn)之后的剪切變形影響關(guān)注較少,且沒有一個(gè)統(tǒng)一的理論能夠完整地反映混凝土結(jié)構(gòu)的受剪性能。本文從混凝土結(jié)構(gòu)的受剪基本理論入手,同時(shí)開展鋼筋混凝土和預(yù)應(yīng)力混凝土梁的受剪承載力研究,重點(diǎn)探究斜向開裂后剪切變形對(duì)預(yù)應(yīng)力混凝土梁跨中撓度的影響,最后在有限元軟件中定量分析了斜裂縫開展對(duì)實(shí)橋跨中撓度的影響。本文研究主要取得了如下成果：(1)收集了216根鋼筋混凝土有腹筋梁剪切試驗(yàn)數(shù)據(jù),分析討論了受剪承載力隨著剪跨比、截面有效高度、混凝土抗壓強(qiáng)度、縱筋率、配箍特征值等因素變化的基本規(guī)律�；阼旒�-拱模型,考慮變形協(xié)調(diào)條件,推導(dǎo)了能夠考慮全剪跨比影響的鋼筋混凝土梁受剪承載力計(jì)算公式。采用統(tǒng)計(jì)特征值法、影響因素法對(duì)建議方法以及各國(guó)設(shè)計(jì)規(guī)范計(jì)算結(jié)果進(jìn)行了分析比較,結(jié)果表明建議方法預(yù)測(cè)精度較高。(2)基于桁架-拱模型,分別考慮預(yù)應(yīng)力以及受壓翼緣對(duì)受剪承載力的提高作用,推導(dǎo)了預(yù)應(yīng)力混凝土有腹筋梁受剪承載力計(jì)算公式。收集了115根預(yù)應(yīng)力混凝土有腹筋梁剪切試驗(yàn)數(shù)據(jù),分析討論了受剪承載力隨剪跨比、截面有效高度、混凝土抗壓強(qiáng)度、縱筋率、配箍特征值以及截面形心處預(yù)壓應(yīng)力等因素變化的基本規(guī)律。采用統(tǒng)計(jì)特征值法、影響因素法對(duì)建議方法以及各國(guó)設(shè)計(jì)規(guī)范的計(jì)算結(jié)果進(jìn)行了分析比較,結(jié)果表明建議方法預(yù)測(cè)精度較高。(3)考慮了斜裂縫間混凝土拉應(yīng)力影響,推導(dǎo)了預(yù)應(yīng)力混凝土梁有效剪切剛度計(jì)算公式。根據(jù)項(xiàng)目組以往開展的6根預(yù)應(yīng)力混凝土矩形梁和文獻(xiàn)中的4根工字型試驗(yàn)梁的剪切性能試驗(yàn),驗(yàn)證了建議有效剪切剛度計(jì)算方法的適用性,并與規(guī)范GB 50010-2010計(jì)算的彎曲變形進(jìn)行了比較。在對(duì)試驗(yàn)梁各階段變形比的分析結(jié)果表明,對(duì)于預(yù)應(yīng)力混凝土薄腹梁,斜向開裂后的剪切變形對(duì)撓度的影響不可忽略。此外,分析評(píng)估了曲線預(yù)應(yīng)力筋角度、普通鋼筋配筋率、剪跨比、跨高比、有效預(yù)應(yīng)力、混凝土抗壓強(qiáng)度及配箍率等因素對(duì)斜裂縫出現(xiàn)之后的剪切變形的影響。(4)以蘇通大橋輔橋預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)為背景,采用有限元分析軟件MIDAS/Civil,比較分析了混凝土收縮徐變、預(yù)應(yīng)力損失及斜裂縫開展對(duì)大跨箱梁橋跨中撓度的影響。分析結(jié)果表明,收縮徐變模式的選取對(duì)跨中撓度的影響較大,預(yù)應(yīng)力束中懸臂束的預(yù)應(yīng)力損失對(duì)跨中撓度的影響最為明顯,而斜裂縫出現(xiàn)之后的剪切變形對(duì)跨中撓度的影響不可忽略。
[Abstract]:According to the disease investigation of long span prestressed concrete box girder bridge, it is often a "complication" that the overlong span deflection and the inclined crack of web plate are often "complications". The web oblique crack is a structural crack, which belongs to the basic theory of shear. At present, the existing tests of shear behavior of concrete at home and abroad focus on the research of bearing capacity, pay little attention to the influence of shear deformation after the occurrence of oblique cracks, and there is no unified theory to reflect the shear behavior of concrete structures completely. In this paper, the shear capacity of reinforced concrete and prestressed concrete beams is studied based on the basic shear theory of concrete structures, and the influence of shear deformation on the deflection of prestressed concrete beams is studied. Finally, the effect of inclined crack development on the deflection of real bridge span is quantitatively analyzed in finite element software. The main achievements of this paper are as follows: (1) the shear test data of 216 reinforced concrete beams with web reinforcement are collected, and the shear bearing capacity with shear span ratio, effective height of section, compressive strength of concrete and ratio of longitudinal reinforcement are analyzed and discussed. The basic law of the change of the hoop characteristic value and other factors. Based on the truss-arch model and considering the condition of deformation coordination, a formula for calculating the shear capacity of reinforced concrete beams considering the effect of total shear span ratio is derived. The statistical eigenvalue method and the influence factor method are used to analyze and compare the calculation results of the suggested method and the design codes of various countries. The results show that the proposed method has a high prediction accuracy. (2) based on truss-arch model, the proposed method is based on the truss-arch model. Considering the effect of prestress and compression flange on the shear capacity, the formulas for calculating the shear capacity of prestressed concrete beams with web reinforcement are derived. The shear test data of 115 prestressed concrete beams with web reinforcement are collected, and the shear bearing capacity with shear span ratio, the effective height of section, the compressive strength of concrete and the ratio of longitudinal reinforcement are analyzed and discussed. The basic law of the change of the characteristic value of the hoop and the preloading stress at the center of the cross section. The statistical eigenvalue method and the influence factor method are used to analyze and compare the calculation results of the suggested method and the design codes of various countries. The results show that the proposed method has a high prediction accuracy. (3) the effect of tensile stress on concrete between inclined cracks is taken into account. The formula of effective shear stiffness of prestressed concrete beam is derived. According to the shear behavior tests of 6 prestressed concrete rectangular beams and 4 I-shaped test beams in the literature, the applicability of the proposed effective shear stiffness calculation method is verified. The bending deformation calculated by GB 50010-2010 is compared with that calculated by code GB 50010-2010. The results show that the shear deformation of prestressed concrete thin web beam after diagonal cracking can not be ignored. In addition, the angle of curved prestressed reinforcement, the ratio of reinforcement to reinforcement, the ratio of shear span to span, the ratio of span to height, the effective prestressing force are analyzed and evaluated. The influence of concrete compressive strength and hoop ratio on the shear deformation after the occurrence of oblique cracks. (4) taking the continuous rigid frame of prestressed concrete of Sutong Bridge as the background, the shrinkage and creep of concrete are compared and analyzed by using the finite element analysis software MIDAS/Civil,. The influence of prestress loss and inclined crack development on the midspan deflection of long span box girder bridge. The results show that the selection of shrinkage and creep mode has a great influence on the deflection in the span, and the prestress loss of the cantilever in the prestressing beam has the most obvious effect on the deflection in the span. However, the influence of shear deformation on the deflection in the span can not be ignored after the oblique crack appears.
【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
【分類號(hào)】：TU378.2

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