西安建筑科技大学学报(自然科学版)

330 kV双呼高多横担塔既满足对低电压等级线路或高速、铁路等的跨越,又满足对高电压等级线路钻越.目前未有针对此类塔型的研究,故本文主要建立了双呼高多横担塔的ANSYS有限元分析模型,对其进行模态分析,得出该塔型的前几阶阵型,结果表明:此类型塔易出现横向振动和塔身绕其高度方向出现扭转的现象; 根据随机振动理论,选用Davenport风速谱为脉动风功率自谱,并运用AR法通过软件MATLAB编制程序模拟脉动风,模拟得到的风速功率谱密度曲线与目标风速功率谱密度吻合很好; 模拟顺风向大风工况,对塔进行非线性动力时程分析,将多种结果进行比较提出此塔形的改善意见; 计算双呼高多横担门型塔的风振系数,与规范结果进行比较,为输电塔的设计提供有益的参考.

The 330 kV double-call high multi-span tower satisfies not only the crossing of low-voltage grade lines or high-speed and railway lines, but also the crossing of high-voltage grade lines. At present, there is no research on this type of tower, so this paper mainly establishes ANSYS finite element analysis model of double-hull multi-span tower, carries out a modal analysis and obtains the first several order array of this type of tower. Results show that this type of tower is prone to transverse vibration and torsion around its height direction. According to random vibration theory, Davenport wind speed spectrum is selected as fluctuating wind power Auto-spectrum, and AR method is used to simulate pulsating wind by software MATLAB. Results show that the power spectral density curve of simulated wind speed is in agreement with the target wind speed power spectral density. The non-linear dynamic time-history analysis of the tower is carried out to simulate the downwind gale conditions, and a variety of results are compared to propose the modification of the tower shape. The wind vibration coefficients of the double-hung multi-crossbar portal tower are calculated. Compared with the results of the code, it provides a useful reference for the design of the iron tower.

引言
1 ANSYS有限元模态分析
2 风振响应分析及程序设计
3 风振系数计算
4 结论

图1 双呼高门型塔结构模型图<br/>Fig.1 Structural model of the double-height gate steel tower

图1 双呼高门型塔结构模型图
Fig.1 Structural model of the double-height gate steel tower

表1 双呼高塔各阶固有频率和自振周期<br/>Tab.1 The natural frequency and natural vibration period of orders of the tower

表1 双呼高塔各阶固有频率和自振周期
Tab.1 The natural frequency and natural vibration period of orders of the tower

图2 双呼高门型塔前五阶振型图<br/>Fig.2 Diagram of the first five vibration modes of the tower

图2 双呼高门型塔前五阶振型图
Fig.2 Diagram of the first five vibration modes of the tower

图3 双呼高门型塔分层示意图<br/>Fig.3 Layered diagram of the Double-height gate steel tower

图3 双呼高门型塔分层示意图
Fig.3 Layered diagram of the Double-height gate steel tower

表2 塔身挡风面积及体型系数表<br/>Tab.2 Windshield area and shape factor table of tower body

表2 塔身挡风面积及体型系数表
Tab.2 Windshield area and shape factor table of tower body

图4 脉动风模拟图<br/>Fig.4 Pulsating wind simulation diagram

图4 脉动风模拟图
Fig.4 Pulsating wind simulation diagram

表3 部分横担挡风面积及体型系数表<br/>Tab.3 Windshield area and shape factor table of each tower section of cross arm

表3 部分横担挡风面积及体型系数表
Tab.3 Windshield area and shape factor table of each tower section of cross arm

图5 部分塔段位移时程响应图<br/>Fig.5 Displacement tim response diagram of each tower section

图5 部分塔段位移时程响应图
Fig.5 Displacement tim response diagram of each tower section

表4 塔身部分塔段位移响应<br/>Tab.4 Displacement response of each tower section of tower body

表4 塔身部分塔段位移响应
Tab.4 Displacement response of each tower section of tower body

表5 横担部分塔段位移响应<br/>Tab.5 Displacement response of tower section of cross arm

表5 横担部分塔段位移响应
Tab.5 Displacement response of tower section of cross arm

图6 塔身位移均值随高度变化图<br/>Fig.6 Diagram of mean displacement of tower body varying with height

图6 塔身位移均值随高度变化图
Fig.6 Diagram of mean displacement of tower body varying with height

图7 塔身位移均方随高度变化图<br/>Fig.7 Diagram of the Mean Square of Tower Displacement with Height

图7 塔身位移均方随高度变化图
Fig.7 Diagram of the Mean Square of Tower Displacement with Height

表6 塔身部分塔段位移响应及风振系数<br/>Tab.6 Displacement response and wind vibration coefficient of each tower section of tower body

表6 塔身部分塔段位移响应及风振系数
Tab.6 Displacement response and wind vibration coefficient of each tower section of tower body

图8 时程分析与高耸规范的风振系数对比<br/>Fig.8 Comparison of wind vibration coefficients between time-history analysis and tall structure specification

图8 时程分析与高耸规范的风振系数对比
Fig.8 Comparison of wind vibration coefficients between time-history analysis and tall structure specification

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备注

引言

1 ANSYS有限元模态分析

2 风振响应分析及程序设计

3 风振系数计算

4 结论

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