FRP编织网结构体系的概念、形式及基本受力分析

Concepts,forms and basic analysis of FRP woven web structure

提出一种采用轻质、高强、耐腐蚀的纤维增强复合材料(FRP)板条构成的大跨屋面结构体系———FRP编织网结构。该体系用FRP薄板条交错编织形成柔性网面,网面外边缘固定于环梁上,在网内部通过悬挂配重或预应力索在垂直于网面的方向上张拉,使整个FRP编织网张紧从而具备足够的刚度和承载能力,构成大跨度的屋面结构。FRP编织网结构由编织网、锚固环和面外张拉装置三部分组成,通过环梁施工、FRP网面编织、预张拉和锚固、整体张拉以及固定成形5个步骤施工,主要受力状态有编织预张完成状态、张拉成形状态和受荷状态。编织网的几何构成可用空间坐标矩阵表示,能构成具有不同平面形状和空间形式的编织网结构。文中还对此结构进行了简化模型的分析和有限元计算,证明了此结构体系的可行性。

This paper presents an FRP （fiber reinforced polymer） woven web structure for large-span roof system composed of light-weight, high-strength and anticorrosion FRP strips. FRP strips are crossed and woven to form a flexible FRP web plane, the outer edge of which is fastened and anchored on a ring beam. And the suspended special mass or stressed tendons are applied to the inner web to achieve the tension of the web. The whole web serving as the structure of large-span roof is stressed to have the sufficient stiffness and capacity. An FRP woven web structure is composed of woven web, ring beam for anchoring and equipment for out-of-plane tensioning. It is constructed by the five steps： construting ring beam, weaving FRP web, anchoring after pre-tension, stressing web, and fixing. The loading condition can be categorized into three major stress stages, the initial prestressed state, the out-of-plane tensioned state and the service loading state. The geometry configuration of woven webs is mathematically described in the coordinate matrices. Various planar woven patterns and structural forms are presented. A simplified model of FRP woven web structure is analyzed, and an example of a simple structure is designed with finite element software, validating the feasibility of the FRP woven web structure.