FRP复合材料横担体系空间受力性能足尺试验研究*
- 摘 要
-
（1 西安理工大学土木建筑工程学院，西安 710048； 2 陕西省电力设计院，西安 710054）
［摘要］为研究FRP复合材料横担在三向荷载作用下的空间受力性能，结合某输电线路FRP复合材料塔架，对FRP复合材料横担进行了三向荷载作用下的足尺试验，观察了试验过程及现象，分析了FRP复合材料横担体系的荷载-位移关系曲线，并对横担梁和拉索中钢套管和FRP复合材料的应变变化规律进行了研究。结果表明：钢套管与FRP复合材料具有良好的粘结性，FRP复合材料之间出现轻微撕裂但并未发生破坏；横担梁中部截面外鼓变形，拉索侧向变形很明显。横担梁的荷载-位移关系基本成线性变化，FRP复合材料横担体系的荷载富余度系数约为4.0，表现出较好的受力性能。横担梁及拉索的钢套管应变均小于FRP复合材料的应变，FRP复合材料同一截面应变分布较为均匀。拉索较横担梁更容易发生破坏，设计时应对拉索进行一定的加强处理。研究结论将为FRP复合材料横担的推广应用提供技术参考。［关键词］FRP复合材料; 三向荷载; 横担体系; 输电塔架; 受力性能; 足尺试验中图分类号：TU389.9，TU371.1 文献标识码：A 文章编号：1002-848X(2016)04-0068-06
Full-scale experiment research on space mechanical properties of FRP-composite material cross arm systemMa Hui1, Liu Yunhe1, Wang Zhenshan1, Guo Hongchao1, Tan Rong2(1 School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China; 2 Shannxi Electric Power Design Institute, Xi'an 710054, China)Abstract: Combined with the FRP composite material transmission tower, a full scale experimental study on mechanical properties of the FRP composite cross arm system under three-way loads was performed in order to research space mechanical properties of FRP composite material cross arm system under three-way loads. The experiment process and phenomena were observed. The loaddisplacement curve of composite material cross arm system was analyzed. Strain change laws of steel casing and FRP composite material in the cross arm beam and inhaul cables were also investigated. The research results show that the junction surface between the steel casing and FRP composite material has good bonding and some slight avulsion between the FRP material layers is also observed though without damage. The middle cross-section deformation of the cross arm beam is large and the lateral displacement of inhaul cables is very obvious. The load-displacement curve of cross arm features linear variation rule and the load rich degree coefficient of composite material cross arm system is about 4.0, which shows that has a good mechanical performance. The strain values of steel casing in the cross arm beam and inhaul cables are less than the strain of FRP composite material and the strain distribution in the same section of FRP composite materials is approximate homogeneous. Compared with the cross arm beam, the inhaul cable is prone to damage. Therefore, some strengthening measures need to been taken in the inhaul cables. The research results will provide the technical reference for the design and application of composite materials cross arm.Keywords:FRP composite material; three-way loading; cross arm system; transmission tower; mechanical property; full-scale test
*国家自然科学基金(51408485)，陕西电力设计院资助项目，西安市建设科技项目(SJW2014025)，西安理工大学科研启动基金项目(118-211310)。作者简介：马辉, 博士, 副教授, Email: mahuiwell@163.com。
