溫度和動(dòng)載作用下連續(xù)梁橋橋面鋪裝層力學(xué)分析
發(fā)布時(shí)間：2019-06-02 13:10
【摘要】：橋面鋪裝層力學(xué)分析中普遍采用的方法是在橋梁結(jié)構(gòu)中截取局部梁段加上適當(dāng)?shù)募s束來分析鋪裝層在靜載作用下的受力狀況，對(duì)于橋梁結(jié)構(gòu)，除了要考慮靜載引起的變形和應(yīng)力外，還需要考慮外部激發(fā)的動(dòng)力響應(yīng)，大跨徑混凝土連續(xù)梁橋在溫度作用下往往有較大的變形。本論文通過對(duì)實(shí)橋橋面鋪裝層溫度場(chǎng)的現(xiàn)場(chǎng)觀測(cè)結(jié)果與模擬結(jié)果對(duì)比，驗(yàn)證了利用ABAQUS有限元軟件可以正確地描述橋面鋪裝層溫度場(chǎng)分布。采用自行研制的層間抗剪強(qiáng)度剪切儀對(duì)橋面鋪裝層層間抗剪強(qiáng)度進(jìn)行了室內(nèi)試驗(yàn)。為了準(zhǔn)確分析橋面鋪裝層的受力狀態(tài)，，本文針對(duì)溫度及移動(dòng)荷載共同作用下連續(xù)梁橋橋面鋪裝層受力情況進(jìn)行數(shù)值模擬分析，為橋面鋪裝層設(shè)計(jì)提供參考。 本文以動(dòng)載理論和溫度場(chǎng)理論為基礎(chǔ)，運(yùn)用有限元法，應(yīng)用通用有限元軟件ABAQUS建立了三跨混凝土連續(xù)箱梁橋三維有限元模型，采用半波正弦荷載加載并考慮溫度的作用，進(jìn)行瀝青混凝土橋面鋪裝層在溫度與移動(dòng)荷載共同作用下的力學(xué)時(shí)程響應(yīng)分析，并分析降溫幅度、車速、超載、鋪裝層模量、橋梁跨徑以及鋪裝層厚度對(duì)橋面鋪裝層受力的影響。 研究表明,熱量在橋面鋪裝層中傳遞時(shí)存在滯后現(xiàn)象，且在箱梁橋腹板位置對(duì)應(yīng)的鋪裝層處溫度變化波動(dòng)比較明顯。在溫度和移動(dòng)荷載共同作用下混凝土連續(xù)梁橋橋面鋪裝層在橋梁中跨支座處受力最不利，其最大拉應(yīng)力發(fā)生在鋪裝層表面,最大剪應(yīng)力發(fā)生在鋪裝層間。降溫幅度越大橋面鋪裝層拉應(yīng)力越大，超載比例越大鋪裝層拉應(yīng)力極值與鋪裝層剪應(yīng)力極值越大，鋪裝層拉應(yīng)力極值與鋪裝層剪應(yīng)力極值隨車速增大而減小，并且鋪裝層拉應(yīng)力極值與剪應(yīng)力極值在鋪裝層厚度一定范圍內(nèi)隨鋪裝層厚度增大而減小。 以瀝青混凝土橋面鋪裝層層間剪切試驗(yàn)以及公路瀝青路面設(shè)計(jì)規(guī)范為基礎(chǔ),提出以瀝青混凝土鋪裝層拉應(yīng)力和剪應(yīng)力作為橋面鋪裝層結(jié)構(gòu)設(shè)計(jì)的主要指標(biāo)。根據(jù)溫度與動(dòng)載共同作用下橋面鋪裝層受力分析結(jié)果，綜合考慮應(yīng)力指標(biāo)以及經(jīng)濟(jì)因素得到不同跨徑下鋪裝層合理厚度范圍。
[Abstract]:The commonly used method in the mechanical analysis of bridge deck pavement is to intercept the local beam section in the bridge structure and add appropriate constraints to analyze the stress condition of the pavement layer under static load. For the bridge structure, In addition to considering the deformation and stress caused by static load, it is also necessary to consider the dynamic response excited by external excitation. Long-span concrete continuous beam bridges often have large deformation under the action of temperature. In this paper, by comparing the field observation results with the simulation results, it is verified that the temperature field distribution of bridge deck pavement can be correctly described by using ABAQUS finite element software. The interlaminar shear strength of bridge deck pavement was tested in laboratory by using the interlaminar shear strength shearing instrument developed by ourselves. In order to accurately analyze the stress state of bridge deck pavement, this paper carries on the numerical simulation analysis to the continuous beam bridge deck pavement under the action of temperature and moving load, which provides a reference for the design of bridge deck pavement. In this paper, based on the dynamic load theory and temperature field theory, the three-dimensional finite element model of three-span concrete continuous box girder bridge is established by using the finite element method and the general finite element software ABAQUS. The three-dimensional finite element model of three-span concrete continuous box girder bridge is loaded by half-wave sinusoidal load and the effect of temperature is considered. The mechanical time history response of asphalt concrete bridge deck pavement under the action of temperature and moving load is analyzed, and the cooling amplitude, speed, overload and pavement modulus are analyzed. The influence of bridge span and pavement thickness on the stress of bridge deck pavement. The results show that there is a lag phenomenon in the heat transfer in the bridge deck pavement, and the temperature fluctuation is obvious in the pavement layer corresponding to the web position of the box girder bridge. Under the action of temperature and moving load, the stress of concrete continuous beam bridge deck pavement is the most unfavorable at the span support of the bridge, the maximum tensile stress occurs on the surface of the pavement layer, and the maximum shear stress occurs between the pavement layers. The larger the cooling amplitude is, the greater the tensile stress of the pavement layer is, the larger the overloading ratio is, the greater the extreme value of tensile stress and shear stress of pavement layer is, and the extreme value of tensile stress of pavement layer and shear stress of pavement layer decrease with the increase of vehicle speed. The extreme values of tensile stress and shear stress of the pavement decrease with the increase of the thickness of the pavement in a certain range of the thickness of the pavement. Based on the interlaminar shear test of asphalt concrete bridge deck pavement and the design code of highway asphalt pavement, the tensile stress and shear stress of asphalt concrete pavement are put forward as the main indexes of bridge deck pavement structure design. According to the stress analysis results of bridge deck pavement under the action of temperature and dynamic load, the reasonable thickness range of pavement layer with different span is obtained by considering the stress index and economic factors.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U443.33
本文編號(hào)：2491126
[Abstract]:The commonly used method in the mechanical analysis of bridge deck pavement is to intercept the local beam section in the bridge structure and add appropriate constraints to analyze the stress condition of the pavement layer under static load. For the bridge structure, In addition to considering the deformation and stress caused by static load, it is also necessary to consider the dynamic response excited by external excitation. Long-span concrete continuous beam bridges often have large deformation under the action of temperature. In this paper, by comparing the field observation results with the simulation results, it is verified that the temperature field distribution of bridge deck pavement can be correctly described by using ABAQUS finite element software. The interlaminar shear strength of bridge deck pavement was tested in laboratory by using the interlaminar shear strength shearing instrument developed by ourselves. In order to accurately analyze the stress state of bridge deck pavement, this paper carries on the numerical simulation analysis to the continuous beam bridge deck pavement under the action of temperature and moving load, which provides a reference for the design of bridge deck pavement. In this paper, based on the dynamic load theory and temperature field theory, the three-dimensional finite element model of three-span concrete continuous box girder bridge is established by using the finite element method and the general finite element software ABAQUS. The three-dimensional finite element model of three-span concrete continuous box girder bridge is loaded by half-wave sinusoidal load and the effect of temperature is considered. The mechanical time history response of asphalt concrete bridge deck pavement under the action of temperature and moving load is analyzed, and the cooling amplitude, speed, overload and pavement modulus are analyzed. The influence of bridge span and pavement thickness on the stress of bridge deck pavement. The results show that there is a lag phenomenon in the heat transfer in the bridge deck pavement, and the temperature fluctuation is obvious in the pavement layer corresponding to the web position of the box girder bridge. Under the action of temperature and moving load, the stress of concrete continuous beam bridge deck pavement is the most unfavorable at the span support of the bridge, the maximum tensile stress occurs on the surface of the pavement layer, and the maximum shear stress occurs between the pavement layers. The larger the cooling amplitude is, the greater the tensile stress of the pavement layer is, the larger the overloading ratio is, the greater the extreme value of tensile stress and shear stress of pavement layer is, and the extreme value of tensile stress of pavement layer and shear stress of pavement layer decrease with the increase of vehicle speed. The extreme values of tensile stress and shear stress of the pavement decrease with the increase of the thickness of the pavement in a certain range of the thickness of the pavement. Based on the interlaminar shear test of asphalt concrete bridge deck pavement and the design code of highway asphalt pavement, the tensile stress and shear stress of asphalt concrete pavement are put forward as the main indexes of bridge deck pavement structure design. According to the stress analysis results of bridge deck pavement under the action of temperature and dynamic load, the reasonable thickness range of pavement layer with different span is obtained by considering the stress index and economic factors.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U443.33
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