本文選題：多梁式鋼-混組合小箱梁橋 + 混雜纖維混凝土��； 參考：《浙江大學(xué)》2014年博士論文

【摘要】：近年來,鋼-混組合結(jié)構(gòu)在橋梁工程領(lǐng)域中逐步被使用,但對有關(guān)多梁式鋼-混組合小箱梁橋的研究甚少,現(xiàn)行鋼-混組合結(jié)構(gòu)設(shè)計規(guī)范也未就其作出具體規(guī)定。為此本文對多梁式鋼-混組合小箱梁橋的受力特性及行為進(jìn)行研究,以為其在今后設(shè)計和運營后的管養(yǎng)提供參考。 首先通過對十四個推出試件及兩片組合箱梁模型的靜載試驗、數(shù)值模擬及國內(nèi)外規(guī)范的對比,研究鋼-混雜纖維混凝土組合梁的力學(xué)特性,給出了混雜纖維混凝土焊釘剪力件的荷載-滑曲線表達(dá)式及極限承載力計算方法,探討了鋼-混雜纖維混凝土組合箱梁在彈性狀態(tài)和破壞狀態(tài)的力學(xué)行為,并對鋼-混雜纖維混凝土組合箱梁極限承載力的設(shè)計方法提出了建議。同時,試驗研究和理論分析結(jié)果表明鋼-混雜纖維混凝土組合箱梁在韌性和抗裂性等方面力學(xué)性能更優(yōu)越于普通混凝土組合箱梁。 其次,基于Newmark組合梁滑移模型,通過引入不同次冪拋物線翹曲函數(shù)來描述組合箱梁頂?shù)装鍛?yīng)力橫向非均勻分布,建立一個能夠同時考慮界面滑移、剪切變形和翼板剪力滯三重效應(yīng)的鋼混組合箱梁模型,推導(dǎo)了簡支組合箱梁在均布荷載和集中荷載作用下的解析解。參數(shù)分析表明,隨著混凝土板厚和鋼梁高度的增加,在跨中腹板和頂板中部處剪力滯系數(shù)下降；當(dāng)組合箱梁寬跨比減少時,在腹板處剪力滯系數(shù)下降,而在頂板中部處剪力滯系數(shù)略增加；與均布荷載相比,各因素變化在集中荷載作用下,對組合箱梁跨中截面的剪力滯系數(shù)影響較明顯；滑移剛度變化對剪力滯系數(shù)的影響可以忽略不計。在上述理論分析及設(shè)計加工的試驗?zāi)Ｐ突A(chǔ)上,進(jìn)一步對典型的兩片組合箱梁模型進(jìn)行了剪滯試驗研究,結(jié)果表明,理論分析與試驗測試結(jié)果吻合很好,驗證了理論模型和解析解的正確性。 從實用設(shè)計方法出發(fā),考慮多梁式鋼-混組合小箱梁橋界面滑移效應(yīng),分別用傳統(tǒng)的多梁式橋的偏心壓力法、剛接梁法,推導(dǎo)了考慮界面滑移效應(yīng)影響的偏心壓力法、剛接梁法修正計算公式。通過實際工程算例表明,采用本文所提出的修正理論算法結(jié)果與有限元方法的計算結(jié)果吻合較好,表明所提出的修正剛接梁法適用于計算多梁式鋼-混組合小箱梁橋跨中橫向分布系數(shù),當(dāng)滿足窄橋條件時,也可采用考慮滑移的修正偏心壓力法。參數(shù)研究表明,在進(jìn)行多梁式鋼-混組合小箱梁橋設(shè)計時,為減少橋梁的偏載效應(yīng),建議采用不完全剪力連接形式。 最后,基于比擬板法,在豎向荷載作用下具有多道橫隔梁的多梁式鋼混組合小箱梁橋通過縱橫向剛度離散,同時考慮混凝土與鋼梁間焊釘?shù)幕朴绊?將其比擬成一個正交異性板,利用薄板理論建立了多梁式鋼混組合小箱梁橋整體分析的微分方程組,簡化后求出在均布荷載下的滑移方程和撓度方程。通過算例與有限元數(shù)值結(jié)果及已有研究進(jìn)行比較,驗證其正確性。結(jié)果表明,剪力連接件的剛度變化對組合梁撓度影響可以忽略,而對滑移量影響較為明顯。
[Abstract]:In recent years, the steel-concrete composite structure has been gradually used in the field of bridge engineering, but there is little research on the multi beam steel mixed combination small box girder bridge, and the current steel mixed composite structure design specification has not been specified. Provide reference for the future design and operation of management.
In this paper, the mechanical properties of steel hybrid fiber reinforced concrete composite beams are studied by static load test, numerical simulation and domestic and foreign norms, and the calculation method of load slip curve and ultimate bearing capacity of hybrid fiber reinforced concrete shear parts are given through the static load test, numerical simulation and domestic and foreign norms, and the steel mixing is discussed. The mechanical behavior of the fiber reinforced concrete composite box beam in the elastic state and failure state and the design method of the ultimate bearing capacity of the steel hybrid fiber concrete composite box girder are proposed. At the same time, the experimental and theoretical analysis results show that the mechanical properties of the steel hybrid fiber concrete composite box are superior to the mechanical properties of Liang Zairen and crack resistance. General concrete composite box girder.
Secondly, based on the Newmark composite beam slip model, by introducing different power parabolic warpage functions to describe the transverse non uniform distribution of stress in the top and bottom of the composite box beam, a steel mixed box girder model which can simultaneously consider the three effects of interface slip, shear deformation and shear lag of wing plate is established, and the simple supported composite box girder is derived in the uniform load. The analysis shows that the shear lag coefficient decreases with the increase of the thickness of the concrete plate and the height of the steel beam. When the Liang Kuan span ratio decreases, the shear lag coefficient at the web is reduced, and the shear lag coefficient at the middle of the top plate is slightly increased; compared with the uniform load load, the shear lag coefficient is slightly increased. The influence of various factors on the shear lag coefficient of the middle cross section of the composite box girder is obvious under the concentrated load, and the effect of the change of slip stiffness on the shear lag coefficient can be ignored. On the basis of the theoretical analysis and the experimental model of the design and processing, the shear lag test of the typical two composite box girder models is further studied. The results show that the theoretical analysis is in good agreement with the test results, and the correctness of the theoretical model and the analytical solution is verified.
From the practical design method, the slip effect of the multi beam steel and mixed composite small box girder bridge is considered. The eccentric pressure method of the traditional multi beam bridge and the rigid connection method are used respectively. The eccentric pressure method considering the effect of the interface slip effect and the correction formula of the rigid connection beam method are derived. The correction method proposed in this paper is shown by the practical engineering example. The results of the theoretical algorithm are in good agreement with the calculation results of the finite element method. It shows that the proposed modified rigid joint beam method is suitable for calculating the transverse distribution coefficient in the span of the multi beam steel mixed composite small box girder bridge. When the narrow bridge condition is satisfied, the modified eccentric pressure method considering slip can also be adopted. In the design of small box girder bridge, incomplete shear connection is recommended to reduce the partial load effect of the bridge.
Finally, based on the analogy plate method, the multi beam steel mixed composite small box girder bridge with multi beam cross beam is discrete through the longitudinal and transverse stiffness under the vertical load, and takes into account the slippage effect between the concrete and the steel beam, and compares it into a orthotropic plate, and the integral analysis of the multi beam steel mixed composite small box girder bridge is established by the thin plate theory. The differential equations of differential equations are simplified and the slip equation and deflection equation are obtained under uniform load. A numerical example is compared with the finite element numerical results and previous studies to verify its correctness. The results show that the stiffness change of the shear connectors can be neglected and the effect on the slip is more obvious.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U441;U446

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