寒冷地区单层网格支承膜结构天线罩工程检测研究  

Research on engineering detection of single⁃layer grid⁃supported membrane structure radome in cold area

作　　者：王超[1] 孙小刚 张李军 罗晓群[2] WANG Chao;SUN Xiaogang;ZHANG Lijun;LUO Xiaoqun(Nanjing Research Institute of Electronics Technology,Nanjing 210039,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]南京电子技术研究所,南京210039 [2]同济大学土木工程学院,上海200092

出　　处：《建筑结构》2024年第21期110-116,共7页Building Structure

基　　金：国家自然科学基金项目(51490664)。

摘　　要：近年来,国内早期在役索膜结构逐渐达到使用寿命,对其进行科学的检测评估将成为重要工作。以东北地区一座既有单层网格支承膜结构天线罩为对象,对其工程检测及安全性评估方法进行了详细研究。被检天线罩已建成约14年,其膜结构采用的PVC膜材即将达到15年的使用寿命,检测评估中通过对现场既有膜材进行实验研究,评估老化膜材的力学性能及剩余单轴抗拉强度;测量了钢结构的所有节点位置,确定了既有结构的当前位形;对钢结构的焊缝质量、销轴质量等进行了现场检测;建立了目前位形下的钢结构及膜结构的有限元模型,评估现有材料性能下天线罩结构在要求风荷载下的安全性。研究表明,所测项目在东北严寒地区经历14年后仍保持了较好的工作性能,膜材的力学性能虽有所退化但具备达到使用寿命(15年)的工作能力。In recent years,the early in⁃service cable⁃membrane structure in China has gradually reached its service life,and scientific detection and evaluation will become an important task.Taking an existing single⁃layer grid⁃supported membrane structure radome in Northeast China as the object,its engineering detection and safety evaluation methods were studied detailly.The tested radome has been built for about 14 years,and the PVC membrane used in its membrane structure is about to reach a service life of 15 years.In the detection and evaluation,the mechanical properties and residual uniaxial tensile strength of the aged membrane are evaluated by experimental research on the existing membrane materials on site.All the node positions of the grid structure were measured,and the current configuration of the existing structure was detected.The weld quality and pin quality of the grid steel structure were tested on site.The finite element model of steel structure and membrane structure under the current configuration was established to evaluate the safety of the radome structure under the required wind load under the existing material properties.The research shows that the measured project still maintains good working performance after 14 years in the severe cold region of Northeast China.Although the mechanical properties of the membrane material are degraded,it has the working ability to reach the service life(15 years).

关 键 词：网格结构 膜结构 天线罩 工程检测 性能退化 

分 类 号：TU758.11[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]