波形钢腹板桥施工期气动干扰与静风稳定性
发布时间：2018-10-22 16:39
【摘要】：摘要：本文以某波纹钢腹板桥施工最大悬臂状态为工程背景，采用FLUENT和ANSYS有限元软件进行数值模拟计算，研究了单、双幅波纹钢腹板桥典型断面的三分力系数、气动干扰效应及施工期最大悬臂状态的静风稳定性，取得的研究成果如下： 采用fluent软件进行流体数值模拟计算的方法，，数值计算了单幅箱型桥梁二维断面的静力三分力系数，并和风洞试验比较，验证了数值模拟计算的可靠性；计算了在-5度到5度风攻角范围内跨中典型断面的静力三分力系数，说明本文对波形钢腹板组合箱梁进行二维简化模拟分析的可行性；分别计算梁高为3.50m、3.6m、3.9m、4.4m、5.1m、6.4m的波纹钢腹板桥典型组合箱梁截面在-5度到5度11个攻角下静力三分力系数，其中升力系数和阻力系数随着梁高的增高逐渐增大，且在不同攻角下，升力系数和阻力系数变化较大，因此梁高和攻角是影响箱梁断面静力系数的主要因素；对上述典型截面进行了三维状态的静力三分力系数的数值计算，且三维流场数值模拟结果与二维流场的结果存在一定偏差，但在可接受范围。 采用fluent软件进行流体数值模拟计算的方法，数值计算了双幅箱型桥梁梁高分别为3.50m、3.6m、3.9m、4.4m、5.1m、6.4m的典型截面在-5度到5度11个攻角下二维断面的静力三分力系数，结果表明：由于上游断面对下游的遮挡作用，双幅桥和单幅桥相比，下游桥的静力系数受气动干扰影响较大；下游阻力系数与单桥相比几乎有一个数量级的差别，而对上游阻力系数影响较小几乎可以忽略；选取跨中典型断面的梁高来研究双幅桥等高度不同间隔下在-5度到5度11个攻角下，上下游受气动干扰效应的影响，随着间隔的不断增大，下游静力系数逐渐趋于单幅桥下的静力系数，即气动干扰效应有逐渐变小的趋势；选取跨中典型断面的梁高来研究等间隔不同高差下在-5度到5度11个攻角下，上下游受气动干扰效应的影响，随着高差绝对值的不断增大，下游静力系数逐渐趋于单幅桥下的静力系数，即气动干扰效应有逐渐变小的趋势。 对ansys进行二次开发，以波纹钢腹板箱梁桥施工期最大悬臂状态为研究对象，进行静风稳定性计算，分别研究了不同高度波纹钢腹板箱梁桥的静风临界风速。结果表明：当波形钢腹板桥桥墩高度为一般高度时，静风稳定性较好，当桥墩高度为高墩时，静风稳定性较差。
[Abstract]:Abstract: taking the maximum cantilever state of a corrugated steel web bridge as the engineering background, using FLUENT and ANSYS finite element software to carry out numerical simulation calculation, the three-point force coefficient of typical section of single and double corrugated steel web plate bridge is studied. The effect of aerodynamic disturbance and the static wind stability of the maximum cantilever state during the construction period are studied. The results are as follows: the method of numerical simulation of fluid using fluent software, The static three-point force coefficient of two-dimensional section of single box bridge is numerically calculated, and compared with wind tunnel test, the reliability of numerical simulation calculation is verified, and the static three-point coefficient of typical cross-section in the range of -5 degree to 5 掳wind attack angle is calculated. This paper shows the feasibility of two-dimensional simplified simulation analysis of corrugated steel web composite box girders, and calculates the static three-point coefficients of typical composite box girder sections of corrugated steel web bridges with a beam height of 3.50 ~ 3.6mand 3.6mand 3.9mand 4.4mand 5.1mand 6.4m at the angles of attack from -5 degrees to 5.11 degrees of attack, respectively. Among them, the lift coefficient and resistance coefficient increase with the increase of beam height, and the lift coefficient and resistance coefficient change greatly under different attack angles, so the beam height and attack angle are the main factors that affect the static coefficient of box girder section. The three dimensional static force coefficients of the typical sections are numerically calculated, and the numerical simulation results of the three dimensional flow field are deviated from those of the two dimensional flow field, but in the acceptable range. By using the method of fluid numerical simulation with fluent software, the static force coefficients of two dimensional cross sections with a typical cross section of 3.50mg ~ 3.6mg ~ 3.9m ~ 4.4mL ~ (-4) m ~ (-5.1m) and 11 attack angles of -5 ~ 5 ~ 5 ~ (-1) are calculated numerically, and the static force coefficients of 2-D cross-section are calculated under 11 attack angles (-5 ~ 5 ~ 5 ~ 5 ~ 11 angles of attack), respectively. The results show that the static coefficient of the downstream bridge is greatly affected by aerodynamic interference, and the downstream drag coefficient is almost an order of magnitude different from that of the single bridge because of the blocking effect of the upstream section on the downstream, and the influence of aerodynamic interference on the static coefficient of the downstream bridge is greater than that of the single bridge. However, the influence on the upstream drag coefficient is negligible, and the upper and lower reaches are affected by aerodynamic interference at the same interval between -5 掳and 5 掳11 attack angles, and the beam height of typical cross section is selected to study the influence of aerodynamic interference on the upper and lower reaches of the bridge at different intervals of the same height from -5 degrees to 5 degrees of attack. With the increasing of the interval, the downstream static coefficient tends to decrease gradually under the single bridge, that is, aerodynamic interference effect. Select the beam height of typical cross section to study that the upper and lower reaches are affected by aerodynamic interference under the condition of equal interval and different height difference between -5 degrees and 5 degrees and 11 angles of attack, and with the increase of absolute value of height difference, the upper and lower reaches are affected by aerodynamic interference effect. The downstream static coefficients tend to decrease gradually under a single bridge, that is, aerodynamic interference effect. Taking the maximum cantilever state of corrugated steel web box girder bridge as the research object, the static wind stability of the corrugated steel web box girder bridge is calculated, and the critical wind speed of the corrugated steel web box girder bridge with different height is studied respectively. The results show that the static wind stability is better when the pier height of corrugated steel web bridge is normal, and the static wind stability is poor when the pier height is high.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
本文编号：2287715
[Abstract]:Abstract: taking the maximum cantilever state of a corrugated steel web bridge as the engineering background, using FLUENT and ANSYS finite element software to carry out numerical simulation calculation, the three-point force coefficient of typical section of single and double corrugated steel web plate bridge is studied. The effect of aerodynamic disturbance and the static wind stability of the maximum cantilever state during the construction period are studied. The results are as follows: the method of numerical simulation of fluid using fluent software, The static three-point force coefficient of two-dimensional section of single box bridge is numerically calculated, and compared with wind tunnel test, the reliability of numerical simulation calculation is verified, and the static three-point coefficient of typical cross-section in the range of -5 degree to 5 掳wind attack angle is calculated. This paper shows the feasibility of two-dimensional simplified simulation analysis of corrugated steel web composite box girders, and calculates the static three-point coefficients of typical composite box girder sections of corrugated steel web bridges with a beam height of 3.50 ~ 3.6mand 3.6mand 3.9mand 4.4mand 5.1mand 6.4m at the angles of attack from -5 degrees to 5.11 degrees of attack, respectively. Among them, the lift coefficient and resistance coefficient increase with the increase of beam height, and the lift coefficient and resistance coefficient change greatly under different attack angles, so the beam height and attack angle are the main factors that affect the static coefficient of box girder section. The three dimensional static force coefficients of the typical sections are numerically calculated, and the numerical simulation results of the three dimensional flow field are deviated from those of the two dimensional flow field, but in the acceptable range. By using the method of fluid numerical simulation with fluent software, the static force coefficients of two dimensional cross sections with a typical cross section of 3.50mg ~ 3.6mg ~ 3.9m ~ 4.4mL ~ (-4) m ~ (-5.1m) and 11 attack angles of -5 ~ 5 ~ 5 ~ (-1) are calculated numerically, and the static force coefficients of 2-D cross-section are calculated under 11 attack angles (-5 ~ 5 ~ 5 ~ 5 ~ 11 angles of attack), respectively. The results show that the static coefficient of the downstream bridge is greatly affected by aerodynamic interference, and the downstream drag coefficient is almost an order of magnitude different from that of the single bridge because of the blocking effect of the upstream section on the downstream, and the influence of aerodynamic interference on the static coefficient of the downstream bridge is greater than that of the single bridge. However, the influence on the upstream drag coefficient is negligible, and the upper and lower reaches are affected by aerodynamic interference at the same interval between -5 掳and 5 掳11 attack angles, and the beam height of typical cross section is selected to study the influence of aerodynamic interference on the upper and lower reaches of the bridge at different intervals of the same height from -5 degrees to 5 degrees of attack. With the increasing of the interval, the downstream static coefficient tends to decrease gradually under the single bridge, that is, aerodynamic interference effect. Select the beam height of typical cross section to study that the upper and lower reaches are affected by aerodynamic interference under the condition of equal interval and different height difference between -5 degrees and 5 degrees and 11 angles of attack, and with the increase of absolute value of height difference, the upper and lower reaches are affected by aerodynamic interference effect. The downstream static coefficients tend to decrease gradually under a single bridge, that is, aerodynamic interference effect. Taking the maximum cantilever state of corrugated steel web box girder bridge as the research object, the static wind stability of the corrugated steel web box girder bridge is calculated, and the critical wind speed of the corrugated steel web box girder bridge with different height is studied respectively. The results show that the static wind stability is better when the pier height of corrugated steel web bridge is normal, and the static wind stability is poor when the pier height is high.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
【参考文献】
相关期刊论文 前10条
1 陈政清;胡建华;;桥梁颤振导数识别的时域法与频域法对比研究[J];工程力学;2005年06期
2 张志田;葛耀君;陈政清;;基于气动新模型的大跨度桥梁频域抖振分析[J];工程力学;2006年06期
3 张志田;葛耀君;;考虑抖振影响的大跨度桥梁静风稳定性分析[J];工程力学;2006年08期
4 谭红霞;陈政清;;CFD在桥梁断面静力三分力系数计算中的应用[J];工程力学;2009年11期
5 陈宝春,黄卿维;波形钢腹板PC箱梁桥应用综述[J];公路;2005年07期
6 钱建漳;;波形钢腹板预应力混凝土结合型箱梁的发展现状与施工[J];公路交通技术;2006年03期
7 陈宝春;王远洋;黄卿维;;波形钢腹板混凝土拱桥新桥型构思[J];世界桥梁;2006年04期
8 Richard Sause;Thomas N. Braxtan;;梯形波纹钢腹板的剪切强度[J];钢结构;2011年02期
9 黄鹏,顾明,张锋,叶丰;上海金茂大厦静风荷载研究[J];建筑结构学报;1999年06期
10 万水,汤意,王劲松;波形钢腹板PC组合箱梁结构特点分析与试验研究[J];南京理工大学学报(自然科学版);2004年05期
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