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主要阐述中美两国通信塔桅设计规范对风荷载计算的差异,以STAAD计算程序进行45m单管塔内力计算实例做对比,供从事海外通信塔桅设计和管理的工程人员参考。 相似文献
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在目前的配重式通信塔桅基础中,在造价、施工灵活性、施工效率等方面已经不能满足实际工程的需要。论文结合笔者多年工作经验以及工程案例,在解决上述配重基础问题上提出一些创新探索,主要针对案例中配重基础在通信塔桅中的应用设计作了简要阐述及分析,以供同行参考。 相似文献
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1 概述 随着通信事业,特别是移动通信的迅猛发展,屋顶上的各种突型的通信用塔桅结构,如雨后春笋般建立起来。屋顶塔桅结构的类型很多,本文限于钢结构范畴。 屋顶塔桅结构迅速发展的原因如下:移动通信与微波通讯均属于直线传播,中间不能有阻挡,故天线须有一定挂高,但在城区很难找到建塔或桅杆的 相似文献
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Dynamic response of guyed masts 总被引:8,自引:0,他引:8
Murty K.S. Madugula Yohanna M.F. Wahba Gerard R. Monforton 《Engineering Structures》1998,20(12):1097-1101
Natural frequencies of guyed masts were determined by modelling the mast as truss elements in one model and as beam-column elements in another model. Guys were modelled as cable elements in both cases. The natural frequencies from the two models agreed closely with each other. For the purpose of verification of the finite element modelling, two triangular steel latticed scale-modelled guyed masts were fabricated and tested on a shake table specially designed to test guyed masts. The experimental results were in good agreement with the results from the finite element analysis. The finite element modelling was then applied to six existing towers which are representative of the design practices in Canada. Based on the results of these analyses, the influence of ice accretion, guy initial tensions and torsion resistors on the dynamic characteristics of the guyed masts is discussed. 相似文献
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S. Ali Ghafari OskoeiGhyslaine McClure 《Engineering Structures》2011,33(5):1764-1772
Telecommunication structures are essential components of communication and post-disaster networks and critically important facilities require reliable earthquake-resistant design procedures in seismically active regions. Calculation of the nonlinear seismic response of tall guyed masts using detailed time-step finite element methods is far more complex than linear response spectrum analysis that is routinely used in structural engineering practice. It is recognized that detailed computational procedures are not always necessary, in particular when the goal of the analysis is to provide a global earthquake-resistant design check on a regular structure with predictable response: this is when rational simplified methods are called upon to calculate the seismic demand. However, up until now, no such method exists for tall guyed masts that can account for the dynamic cable-mast interactions which dominate seismic effects in these structures. In the study reported here, the writers explore the dynamic behavior of guy cables under harmonic and seismic support ground motion through detailed computational modeling and propose a novel frequency-dependent method to evaluate the equivalent dynamic stiffness of guy clusters. This development will contribute efficiently towards a new robust rational model of general applicability for simplified seismic analysis of tall guyed telecommunication masts.Detailed numerical simulations involving 57 guy cables from eight existing towers with varying heights of 150-607 m were used in the study. A mathematical procedure was developed to replace the nonlinear time-variant cable stiffness with an equivalent linear frequency-dependent spring/mass system, based on the response spectrum of individual guy cables and the frequency content of the seismic excitation. Comparison of the main response indicators of these equivalent models and the detailed nonlinear finite element analysis results confirmed the reasonable and consistent engineering accuracy of the proposed simplified method with considerable savings in analysis effort. 相似文献
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铝合金的插杆长度、槽口大小对实际应用十分重要。为此,对两种不同尺寸的铝合金桅杆和插杆进行了分析,推导出了插杆的最小插入深度 相似文献
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本文利用虚功原理,基于修正的拉格朗日列式,得到桅杆结构增量形式的非线性有限元动力方程。在此基础上,以地震波为激励,计算了桅杆结构受地震作用的非线性位移、加速度动力响应,并对桅杆结构在纤绳初应力变化下的抗震性能进行了分析。 相似文献
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基于频域的桅杆结构风振疲劳分析 总被引:2,自引:0,他引:2
本文基于随机振动理论对实测的桅杆结构风洞试验数据进行处理,分析了桅杆结构风振响应的频谱特性,并且从频域着手通过简单的数值运算求得足够精确的等效应力用于计算桅杆结构的风振疲劳寿命,避免了雨流点法极大的工作量。 相似文献