某共享通讯塔加装天线后结构安全性校核

Structure Safety Assessment for a Communication Tower due to Installing Extra Antenna

对某共享通讯铁塔加装天线后结构安全性进行校核,建立了基于不同梁杆单元及节点连接的通讯铁塔空间刚架和混合有限元模型,对其结构动态特性及静力分析结果进行了对比分析,指出两种不同模型的动态特性相差不大,采用刚架模型来复核偏于安全;对通讯塔在加装天线后在风荷载及塔自重作用下结构安全性评估,并对该铁塔底层塔段弦杆中点变形超限的特殊情形,提出了按压弯构件进行稳定性分析,评定了通讯塔增加负荷后的结构安全性。该方法为共享通讯塔加装天线结构安全性评估提供了参考。

Structure safety assessment for the communication tower due to installing extra antenna is studied.The rigid frame and mixed finite element models of the communication tower,which are based on different beam-rod elements and node connecting,are established;their structural dynamic features and static analysis results are compared,respectively,and the difference of dynamic feature between the two models are found to be nice.Therefore,it is reliable to assess the structure safety by rigid frame model.The structural safety assessment is taken for the communications towers under the weight of wind load and themselves after the antenna installed.Based on the landing chord in the communication tower being added an angle iron and with a slight deflection,a method is presented to check the stability of the chord.The safety assessment of the communication tower is taken with the increased load.The method can provide some references for the structure safety assessment of communication tower installed antenna.