1000千伏特高压铁塔组立施工中的抗风能力研究
发布时间：2018-10-19 14:48
【摘要】：抱杆和铁塔均属于高耸结构,其高柔特性导致其对水平荷载非常敏感,针对淮南~上海1000kV特高压输电工程铁塔组立施工,选用座地双摇臂抱杆组立铁塔,并运用ANSYS软件对铁塔与抱杆耦合系统的抗风能力进行研究,一般风荷载有两种表达形式:一种是等效静力法,即平均风荷载乘以风振系数;另一种是数值模拟法,即平均风荷载加上脉动风荷载。本文运用ANSYS软件建立铁塔与抱杆耦合系统三维模型,采用Block Lanczos法对模型进行模态分析得出结构的固有频率和自振振型等重要参数,并根据模态分析得出的前两阶的频率和结构的振型阻尼比求出阻尼常数和。根据等效静力法求出铁塔与抱杆耦合系统各节点风荷载,运用ANSYS软件对铁塔与抱杆耦合系统进行等效静力分析,得出不同工况下的位移变化和应力分布以及调幅绳、内拉线、腰环、锚固绳的受力情况等结果,分析铁塔与抱杆耦合系统在保证安全的情况下所能承受的最大风速,确定抱杆使用范围,同时也明确了铁塔与抱杆的应力分布规律,为铁塔组立施工方案的编制提供依据,而且这种组塔施工方法对临近带电体组塔施工、山区组塔施工等无法架设外拉线的塔位组塔施工有重要参考价值。选用Davenport谱,通过MATLAB软件编程得到各点的风速时程曲线,再根据数值模拟法计算铁塔与抱杆耦合系统在34m/s强风工况下的风荷载时程曲线,并通过ANSYS软件的瞬态动力分析功能对铁塔与抱杆耦合系统进行风振响应分析,得出铁塔与抱杆耦合系统在34m/s风速工况下的位移时程样本、速度时程样本、加速度时程样本以及应力时程样本,为在铁塔组立施工过程中发生台风天气时提供应对措施。同时根据铁塔与抱杆耦合系统风振响应分析得出的结果,求出铁塔与抱杆各分段的风振系数,并将此数值模拟结果与在等效静力分析时根据《建筑结构荷载规范》采用的风振系数值进行对比,分析铁塔与抱杆耦合系统各段风振系数取值问题。
[Abstract]:Both pole and tower belong to towering structure, which is sensitive to horizontal load due to its high flexibility. In view of the construction of tower group in Huainan-Shanghai 1000kV UHV transmission project, the double rocker arm iron tower is chosen to set up the tower in Huainan-Shanghai UHV transmission project. The wind resistance of the coupling system of tower and pole is studied by using ANSYS software. There are two expressions of wind load: one is equivalent static method, that is, average wind load times wind-induced vibration coefficient, the other is numerical simulation method. Mean wind load plus pulsating wind load. In this paper, the three-dimensional model of the coupling system of iron tower and pole is established by using ANSYS software. The modal analysis of the model is carried out by using Block Lanczos method, and the important parameters such as the natural frequency and the natural vibration mode of the structure are obtained. According to the modal analysis, the damping constant sum of the first two order frequencies and the damping ratio of the structure are obtained. According to the equivalent static method, the wind load of each node of the coupling system of tower and pole is calculated, and the equivalent static analysis of the coupling system of tower and pole is carried out by using ANSYS software, and the displacement change and stress distribution under different working conditions as well as the amplitude modulation rope and inner drawing line are obtained. This paper analyzes the maximum wind speed which can be withstood by the coupling system of iron tower and pole under the condition of safety, determines the range of use of lock rod, and also defines the stress distribution law of tower and pole. It provides the basis for the compilation of the construction scheme of the tower group, and this construction method has important reference value for the construction of the adjacent live body tower, the construction of the mountain area group tower and the construction of the tower position group which can not be erected with the external drawing line. Using Davenport spectrum, the time-history curve of wind speed at each point is obtained by MATLAB software programming, and then the wind load time history curve of the coupling system of tower and pole under the strong wind condition of 34m/s is calculated according to the numerical simulation method. The transient dynamic analysis function of ANSYS software is used to analyze the wind vibration response of the tower and pole coupling system. The displacement time history sample and velocity time history sample of the tower and pole coupling system under the 34m/s wind speed condition are obtained. The acceleration time history sample and the stress time history sample provide the countermeasure when the typhoon weather occurs during the construction of the tower group. At the same time, according to the results of wind vibration response analysis of tower and pole coupling system, the wind-induced vibration coefficient of each segment of tower and pole is calculated. The numerical simulation results are compared with the wind vibration coefficient values adopted in the equivalent static analysis according to the Code of Building structure load, and the wind-induced vibration coefficients of the coupling system between the tower and the pole are analyzed.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM754
本文编号：2281457
[Abstract]:Both pole and tower belong to towering structure, which is sensitive to horizontal load due to its high flexibility. In view of the construction of tower group in Huainan-Shanghai 1000kV UHV transmission project, the double rocker arm iron tower is chosen to set up the tower in Huainan-Shanghai UHV transmission project. The wind resistance of the coupling system of tower and pole is studied by using ANSYS software. There are two expressions of wind load: one is equivalent static method, that is, average wind load times wind-induced vibration coefficient, the other is numerical simulation method. Mean wind load plus pulsating wind load. In this paper, the three-dimensional model of the coupling system of iron tower and pole is established by using ANSYS software. The modal analysis of the model is carried out by using Block Lanczos method, and the important parameters such as the natural frequency and the natural vibration mode of the structure are obtained. According to the modal analysis, the damping constant sum of the first two order frequencies and the damping ratio of the structure are obtained. According to the equivalent static method, the wind load of each node of the coupling system of tower and pole is calculated, and the equivalent static analysis of the coupling system of tower and pole is carried out by using ANSYS software, and the displacement change and stress distribution under different working conditions as well as the amplitude modulation rope and inner drawing line are obtained. This paper analyzes the maximum wind speed which can be withstood by the coupling system of iron tower and pole under the condition of safety, determines the range of use of lock rod, and also defines the stress distribution law of tower and pole. It provides the basis for the compilation of the construction scheme of the tower group, and this construction method has important reference value for the construction of the adjacent live body tower, the construction of the mountain area group tower and the construction of the tower position group which can not be erected with the external drawing line. Using Davenport spectrum, the time-history curve of wind speed at each point is obtained by MATLAB software programming, and then the wind load time history curve of the coupling system of tower and pole under the strong wind condition of 34m/s is calculated according to the numerical simulation method. The transient dynamic analysis function of ANSYS software is used to analyze the wind vibration response of the tower and pole coupling system. The displacement time history sample and velocity time history sample of the tower and pole coupling system under the 34m/s wind speed condition are obtained. The acceleration time history sample and the stress time history sample provide the countermeasure when the typhoon weather occurs during the construction of the tower group. At the same time, according to the results of wind vibration response analysis of tower and pole coupling system, the wind-induced vibration coefficient of each segment of tower and pole is calculated. The numerical simulation results are compared with the wind vibration coefficient values adopted in the equivalent static analysis according to the Code of Building structure load, and the wind-induced vibration coefficients of the coupling system between the tower and the pole are analyzed.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM754
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