共查询到20条相似文献,搜索用时 109 毫秒
2.
通信单管塔基本自振周期计算影响到风荷载及地震作用计算,自振周期与结构质量和刚度的分布情况相关。采用近似计算公式得到的基本自振周期不能准确反映通信单管塔的基本自振周期,通过有限元建立塔身模型计算未考虑通信单管塔连接与附属构件的影响,计算得到的基本自振周期并不能准确反映通信单管塔的基本自振周期。论文在统计中国铁塔股份有限公司通信单管塔标准塔连接与附属构件质量占塔体总质量的比例的基础上,分析连接与附属构件对通信单管塔基本自振周期的影响。计算结果表明,连接与附属构件质量占塔体总质量比例约为30%~60%,其对通信单管塔基本自振周期的影响不可忽略,计算基本自振周期应考虑连接构件与附属构件的影响。计算结果对通信单管塔的设计具有参考价值。 相似文献
3.
4.
单管塔因其结构轻巧、造型美观,越来越多地被应用于城市及对环境有美观要求的地方.通信单管塔属于高耸结构,其受力特点是风荷载起决定作用,高度越高,风荷载的响应越明显.由于通信基站的密度较集中,对于同一地区的风压及地貌相差不大、对通信工艺要求相同的基站,可以规格化塔身主材.针对2类经常建造落地单管塔的地貌,通过对目前运营商常用天线挂高的单管塔结构进行不同风压下的受力分析,给出各参数的选择建议,为工程设计提供一定参考. 相似文献
5.
6.
7.
8.
9.
10.
11.
12.
A. M. Horr M. Safi N. Asadpour 《The Structural Design of Tall and Special Buildings》2002,11(5):353-373
Seismic response of large concrete tower structures with passive or active damping is important in terms of performance under earthquake loads. The conventional finite element method has been used successfully in linear and nonlinear analyses in large concrete structures. The method can be performed by subdividing the large structure into small uniform elements having approximate shape functions. Although this replaces a single complicated structural system with a number of simple uniform elements, in cases of tall concrete tower structures with cracking and crushing behaviour in the concrete material and yielding in the reinforcement, the computer time and memory can be large. Hence, it is desirable to search for a procedure requiring fewer elements and also less computer time and effort to model the structure. In this respect, attention is paid to the advanced complex damped spectral element method, which benefits from the more accurate and also mathematically complicated shape functions. Use of the advanced spectral element method can help engineers to design a complex structure, such as a tall concrete tower, with lower cost and lower weight. Using a computer program, the proposed formulation has been used to derive the nonlinear dynamic response of the 435‐m Tehran Telecommunication Tower. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
13.
A. K. Ghorbani‐Tanha A. Noorzad M. Rahimian 《The Structural Design of Tall and Special Buildings》2009,18(4):371-385
With a height of 435 m, Milad Tower, situated in north‐west of Tehran, Iran, would be the fourth highest telecommunication tower of the world. This tower has the largest head structure among its counterparts. Preliminary studies demonstrate that the upper part of the tower has excessive wind‐induced acceleration‐related vibrations beyond human comfort limit during wind events. In this paper, the effectiveness of tuned mass damper (TMD) on the suppression of wind‐induced motion of Milad Tower is examined through mathematical analyses. The tower is modelled as a vertical linear cantilever beam, with 57 degrees of freedom. The fluctuating wind speed is assumed to be a stochastic process which is identified by an appropriate power spectral density function. Random vibration analyses were carried out to determine response statistics. The possible application of TMDs in suppressing wind‐induced motions of the tower was investigated, and a TMD was designed to be installed at the sky dome. The results clearly show that the designed TMD has a considerable influence on the suppression of the structural response of the tower below human comfort limits. The authors believe that Milad Tower can be considered as a benchmark control problem for television and telecommunication towers by the structural control community. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
14.
绵阳电视塔高200m,全钢结构,建于1989年,2008年遭受了汶川地震。本文对绵阳电视塔进行了灾后现场检测和有限元计算分析。检测结果表明,震后绵阳电视塔塔身垂直度和塔楼平整度较好,在地震作用下主要受力构件处于弹性范围内,说明该结构具有良好的抗震性能。设计时绵阳地区的抗震设防烈度为6度,基本风压为0.35kN/m~2,计算结果表明,该结构抗风起控制作用,按风振起控制作用的抗风设计后,该结构可抵御8度罕遇地震。灾后分别采用振型分解反应谱法和时程分析法对绵阳电视塔在汶川地震中的响应进行了有限元分析,结果发现,两种方法所得结果基本吻合,表明可采用振型分解反应谱法对高耸钢结构在罕遇地震作用下的响应进行定性分析,找出结构内力分布规律及结构薄弱环节;但由于振型分解反应谱法所得结果略小,为了更加可靠地了解高耸钢结构的抗震性能,罕遇地震下仍应进行时程分析。 相似文献
15.
塔式起重机拆卸作为塔机作业中一个重要的组成部分,其安全控制关系重大,除遵守正常的安全操作规程之外,还应对其特殊性做好相应的安全控制,本文对其拆卸过程中一些关键程序安全控制提出初步看法,以供参考。 相似文献
16.
17.
18.
上海市郊的松江斜塔,建造年代早于闻名世界的意大利比萨斜塔,倾斜度超过比萨斜塔,受到了各界人士的关注。松江天马山护珠塔建于公元1079年,塔体为砖木混合结构,七层楼阁形外廓,八角形平面。塔基由砖石混砌相当坚固,塔身用青砖砌筑。因清代乾隆年间遭受大火,开始倾斜。修缮加固采用“围、撑、修”的方案。 相似文献
19.
上海东海大桥芦潮港综合通信塔采用了一种新型钢管结构的塔型。塔高90.75m,全钢管结构,全塔结构分为四个区段。此塔造型采用了有别于常规塔型的结构形式,立面外形成人字形竖立在东海大桥旁,在设计过程中,对结构形式、风荷载计算、结构分析及节点构造等进行了研究和优化,取得了较为理想的成果。 相似文献