半整體橋梁搭板的內(nèi)力計算方法研究
發(fā)布時間：2019-05-22 07:47
【摘要】：對于有縫橋梁來說,橋頭搭板是近臺端簡支于橋臺牛腿上、遠臺端簡支于枕梁或自由擱置臺后路基上的單向受力板。其內(nèi)力計算方法是將搭板橫橋向劃分成單位板寬的搭板條,降維成簡支梁或彈性地基梁進行計算。而在半整體式橋臺橋梁中(后面簡稱半整體橋梁),搭板的近臺端與主梁相連,搭板會受到主梁伸縮、梁端彎曲變形等影響,故搭板除了受搭板自重、車輛荷載等豎向荷載外,還會受到主梁傳遞至搭板端部的荷載。該荷載的種類、大小、以及該端部荷載對搭板內(nèi)力計算的影響是橋梁設(shè)計中一個值得探討的課題。首先,驗證既有有縫橋梁的搭板內(nèi)力計算方法在半整體橋梁中的適應(yīng)性。利用有限元軟件ABAQUS對主梁和搭板的連接處(簡稱橋頭節(jié)點)進行模擬,分別施加搭板端部彎矩、剪力和水平力并運算模型得出結(jié)果。分析結(jié)果得到各荷載對搭板內(nèi)力計算的影響程度,判別出搭板內(nèi)力計算中搭板端部的最主要因素是端部水平力。繼而利用MIDAS建立搭板整體模型,通過計算在不同參數(shù)情況下搭板端部水平力對搭板內(nèi)力計算的影響程度,從而分析得出：既有有縫橋梁搭板的內(nèi)力計算方法不適用于半整體橋梁的搭板設(shè)計。然后,在搭板內(nèi)力計算的簡支梁法基礎(chǔ)上,提出針對半整體橋梁搭板內(nèi)力計算的簡支梁修正法。簡支梁修正法是通過兩個搭板長度修正系數(shù)α和β來考慮半整體橋梁搭板的實際受力情況,修正系數(shù)α和β分別等效搭板底部地基土對搭板的支撐作用和搭板端水平力對搭板內(nèi)力計算的影響,最后對該兩個修正系數(shù)取乘積即得出綜合修正系數(shù)γ。半整體橋梁的搭板內(nèi)力計算中,只需將預(yù)設(shè)搭板長度與綜合修正系數(shù)γ相乘,得出搭板計算長度,并根據(jù)搭板計算長度按照簡支梁法進行計算,即可得出半整體橋梁的搭板內(nèi)力。最后,將簡支梁修正法的理論計算值和有限元計算值對比,驗證簡支梁修正法的正確性。對應(yīng)簡支梁法、彈性地基梁法和簡支梁修正法分別對三種方法進行搭板試設(shè)計,并根據(jù)試設(shè)計分別建立搭板有限元實體模型。在不同參數(shù)組合情況下運算模型并得出計算結(jié)果,提取搭板底緣應(yīng)力,搭板撓度和搭板受拉區(qū)鋼筋應(yīng)力作為參考指標,對比分析三種搭板內(nèi)力計算方法的優(yōu)劣。得出結(jié)論：在三種搭板內(nèi)力計算方法中,簡支梁修正法是最適用于半整體橋梁的搭板設(shè)計。
[Abstract]:For sewn bridges, the bridge head slab is a one-way stress plate simply supported on the platform cow leg near the platform, and simply supported on the pillow beam or on the roadbed behind the free shelving platform at the far end of the bridge. The internal force calculation method is to divide the transverse bridge direction into the strip with unit plate width, and to reduce the dimension into simply supported beam or elastic foundation beam. In the semi-integral bridge (hereinafter referred to as the semi-integral bridge), the near end of the slab is connected to the main beam, and the slab will be affected by the expansion of the main beam and the bending deformation of the beam end, so the slab is not only subjected to vertical loads such as the self-weight of the slab and the load of the vehicle. It will also be subjected to the load transferred by the main beam to the end of the slab. The type and size of the load and the influence of the end load on the internal force calculation of the slab are a topic worthy of discussion in bridge design. Firstly, the adaptability of the internal force calculation method of the existing jointless bridge in the semi-integral bridge is verified. The finite element software ABAQUS is used to simulate the joint of the main beam and the slab (bridge head joint). The bending moment, shear force and horizontal force at the end of the slab are applied to calculate the results respectively. The analysis results show that the influence of each load on the internal force calculation of the slab is obtained, and it is concluded that the horizontal force at the end of the plate is the most important factor in the calculation of the internal force of the slab. Then the whole model of the lap plate is established by using MIDAS, and the influence degree of the horizontal force at the end of the lap plate on the internal force calculation of the slab under different parameters is calculated. It is concluded that the internal force calculation method of existing jointless bridges is not suitable for the design of semi-integral bridges. Then, on the basis of the simple supported beam method for calculating the internal force of the slab, a simple supported beam correction method for the calculation of the internal force of the semi-integral bridge is proposed. The simply supported beam correction method takes into account the actual force of the semi-integral bridge slab by two plate length correction coefficients 偽 and 尾. The correction coefficients 偽 and 尾 are equivalent to the supporting effect of the foundation soil at the bottom of the lap plate and the influence of the horizontal force at the end of the slab on the calculation of the internal force of the slab, respectively. finally, the comprehensive correction coefficient is obtained by taking the product of the two correction coefficients. In the calculation of the internal force of the semi-integral bridge, it is only necessary to multiply the preset plate length with the comprehensive correction coefficient 緯 to obtain the calculated length of the slab, and to calculate the length of the slab according to the simply supported beam method. The internal force of the slab of the semi-integral bridge can be obtained. Finally, the theoretical calculation value of the simply supported beam correction method is compared with that of the finite element method, and the correctness of the simple supported beam correction method is verified. Corresponding to the simply supported beam method, the elastic foundation beam method and the simply supported beam correction method, the three methods are designed, and the finite element solid models of the slab are established according to the trial design. Under the condition of different parameter combination, the calculation model is obtained, and the stress at the bottom edge of the lap plate, the deflection of the slab and the stress of the steel bar in the tension zone of the lap plate are extracted as the reference indexes, and the advantages and disadvantages of the three internal force calculation methods of the slab are compared and analyzed. It is concluded that among the three internal force calculation methods, the simply supported beam correction method is the most suitable for the design of semi-integral bridge.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441
本文編號：2482785
[Abstract]:For sewn bridges, the bridge head slab is a one-way stress plate simply supported on the platform cow leg near the platform, and simply supported on the pillow beam or on the roadbed behind the free shelving platform at the far end of the bridge. The internal force calculation method is to divide the transverse bridge direction into the strip with unit plate width, and to reduce the dimension into simply supported beam or elastic foundation beam. In the semi-integral bridge (hereinafter referred to as the semi-integral bridge), the near end of the slab is connected to the main beam, and the slab will be affected by the expansion of the main beam and the bending deformation of the beam end, so the slab is not only subjected to vertical loads such as the self-weight of the slab and the load of the vehicle. It will also be subjected to the load transferred by the main beam to the end of the slab. The type and size of the load and the influence of the end load on the internal force calculation of the slab are a topic worthy of discussion in bridge design. Firstly, the adaptability of the internal force calculation method of the existing jointless bridge in the semi-integral bridge is verified. The finite element software ABAQUS is used to simulate the joint of the main beam and the slab (bridge head joint). The bending moment, shear force and horizontal force at the end of the slab are applied to calculate the results respectively. The analysis results show that the influence of each load on the internal force calculation of the slab is obtained, and it is concluded that the horizontal force at the end of the plate is the most important factor in the calculation of the internal force of the slab. Then the whole model of the lap plate is established by using MIDAS, and the influence degree of the horizontal force at the end of the lap plate on the internal force calculation of the slab under different parameters is calculated. It is concluded that the internal force calculation method of existing jointless bridges is not suitable for the design of semi-integral bridges. Then, on the basis of the simple supported beam method for calculating the internal force of the slab, a simple supported beam correction method for the calculation of the internal force of the semi-integral bridge is proposed. The simply supported beam correction method takes into account the actual force of the semi-integral bridge slab by two plate length correction coefficients 偽 and 尾. The correction coefficients 偽 and 尾 are equivalent to the supporting effect of the foundation soil at the bottom of the lap plate and the influence of the horizontal force at the end of the slab on the calculation of the internal force of the slab, respectively. finally, the comprehensive correction coefficient is obtained by taking the product of the two correction coefficients. In the calculation of the internal force of the semi-integral bridge, it is only necessary to multiply the preset plate length with the comprehensive correction coefficient 緯 to obtain the calculated length of the slab, and to calculate the length of the slab according to the simply supported beam method. The internal force of the slab of the semi-integral bridge can be obtained. Finally, the theoretical calculation value of the simply supported beam correction method is compared with that of the finite element method, and the correctness of the simple supported beam correction method is verified. Corresponding to the simply supported beam method, the elastic foundation beam method and the simply supported beam correction method, the three methods are designed, and the finite element solid models of the slab are established according to the trial design. Under the condition of different parameter combination, the calculation model is obtained, and the stress at the bottom edge of the lap plate, the deflection of the slab and the stress of the steel bar in the tension zone of the lap plate are extracted as the reference indexes, and the advantages and disadvantages of the three internal force calculation methods of the slab are compared and analyzed. It is concluded that among the three internal force calculation methods, the simply supported beam correction method is the most suitable for the design of semi-integral bridge.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441
【相似文獻】
相關(guān)期刊論文 前10條
1 王磊;劉孝明;李博識;涂家明;;公路橋頭鉸接搭板裝置可行性研究[J];河南科技;2012年09期
2 左文林;;謹防再搭板傾翻砸人[J];建筑工人;1991年03期
3 項貽強;孫筠;金福根;李威;張樹仁;;采用深層混凝土搭板處治橋頭跳車的試驗[J];哈爾濱工業(yè)大學(xué)學(xué)報;2010年01期
4 朱興明;;關(guān)于臺后沉降及搭板破損的維修探討[J];科技創(chuàng)新導(dǎo)報;2008年30期
5 陳祥益;;探討楔形柔性搭板新技術(shù)的應(yīng)用[J];科技與企業(yè);2012年03期
6 諸國平;水泥攪拌樁結(jié)合搭板處理橋頭跳車初探[J];中國市政工程;2002年S1期
7 趙才友;王平;田洪寧;;高速鐵路橋頭剛性楔形搭板受力特性及適應(yīng)性研究[J];城市軌道交通研究;2012年04期
8 陳蘄;;采用水泥攪拌樁結(jié)合鋼筋砼搭板處理橋頭跳車的嘗試[J];中國新技術(shù)新產(chǎn)品;2013年15期
9 王毅;;日本橋梁搭板的設(shè)計方法[J];城市道橋與防洪;2006年06期
10 薛曉輝;張學(xué)鋼;陳金龍;;柔性搭板處治橋頭跳車敏感因素分析[J];河北工業(yè)科技;2010年06期
相關(guān)會議論文 前1條
1 李長安;;焦晉高速公路高填路段橋梁搭板處沉降原因分析及處理方案探討[A];科技、工程與經(jīng)濟社會協(xié)調(diào)發(fā)展——河南省第四屆青年學(xué)術(shù)年會論文集（下冊）[C];2004年
相關(guān)博士學(xué)位論文 前1條
1 牛思勝;黃土地區(qū)臺后跳車柔性搭板處治技術(shù)研究[D];長安大學(xué);2006年
相關(guān)碩士學(xué)位論文 前9條
1 田偉;半整體橋梁搭板的內(nèi)力計算方法研究[D];福州大學(xué);2014年
2 王智德;搭板設(shè)計參數(shù)優(yōu)化解決橋頭跳車的研究及應(yīng)用[D];武漢理工大學(xué);2011年
3 周春東;防治軟土地基橋頭跳車的弧形搭板理論與技術(shù)[D];西安建筑科技大學(xué);2014年
4 李伯巖;整體式橋臺橋梁搭板受力分析[D];東北林業(yè)大學(xué);2011年
5 張宏光;楔型柔性搭板作用性狀的模型試驗與仿真分析[D];長安大學(xué);2004年
6 俞永華;橋頭楔型柔性搭板作用性狀的仿真分析[D];長安大學(xué);2002年
7 張恒;橋頭跳車搭板在線抬升研究[D];武漢理工大學(xué);2014年
8 趙樹青;橋頭跳車病害防治技術(shù)研究[D];山東大學(xué);2009年
9 沈翔;臺后不均勻沉降對新型全無縫橋梁的影響研究[D];湖南大學(xué);2013年
，本文編號：2482785
本文鏈接：http://sikaile.net/kejilunwen/jiaotonggongchenglunwen/2482785.html
教材專著
