通信单管塔抗震性能分析
2016-08-01孙国良
孙国良
摘要: 为确定通信单管塔在地震载荷作用下结构设计的安全性,选取典型的通信单管塔为研究对象,通过合理的结构简化建立有限元模型;参考规范中8烈度罕遇地震的要求,通过静力分析法、振型分解反应谱法和非线性时程法分析计算结构的抗震性能;对3种计算方法得到的结果进行对比,得出不同分析方法计算结果的差别;通过综合分析计算结果评估通信单管塔的抗震性能.
关键词: 通信单管塔; 抗震分析; 静力分析; 反应谱分析; 非线性时程分析; 有限元
中图分类号: TU352.1文献标志码: B
Analysis on antiseismic performance of
communication monopole
SUN Guoliang
(Baoding TTL Antiseismic Research Institute of Telecommunication Equipment, Baoding 071051, Hebei, China)
Abstract: To confirm that the design of communication monopole structure is safe under seismic load, a typical communication monopole is taken as the research object and a finite element model is built by reasonable structure simplification; according to the requirements for the rare 8th seismic intensity in the specifications, the antiseismic performance of the structure is separately calculated by the methods of static analysis, response spectrum analysis and nonlinear time history analysis; the difference of the results are obtained by comparison of the results of the three analysis methods; the calculation results are comprehensively analyzed to evaluate the antiseismic performance of the communication monopole.
Key words: communication monopole; antiseismic analysis; static analysis; response spectrum analysis; nonlinear time history analysis; finite element
0引言
目前,中国移动、电信、联通三大运营商共有通信铁塔200多万根.随着4G的发展,通信铁塔的数量将以每年万级的数量增长.汶川地震、雅安地震均有通信铁塔受到地震载荷激励而倒塌,直接造成局部通信网中断,使抗震救灾抢险的难度增大.为能准确了解灾情,提高通信铁塔的抗震可靠性,需对通信铁塔进行抗震分析.
目前,通信塔的主要形式有:(1)以角钢作为主要受力构件的角钢塔;(2)以无缝钢管组成的空间桁架为受力体的多管塔;(3)以大直径焊接钢管为主要受力体的单管塔.[1]通信单管塔以其具有美观、节约用地、制作方便、易于批量生产等优点,近年来在通信工程中被广泛地应用.与普通角钢塔、多管塔相比,单管塔的整体刚度小,因此在以地震、风荷载为主的横向载荷作用下的水平位移较大.[2]
通信单管塔的主要受力构件为一根下大上……
