【正文】 中國(guó)石油大學(xué)（華東 ） 本科畢業(yè)設(shè)計(jì)（論文） 1 Development and analysis of the largespan FRP woven web structure ABSTRACT: An innovative largespan structural system, namely the FRP woven web structure (FRPWWS), is introduced in this paper. In an FRPWWS, the highstrength FRP strips are “woven” like bamboo strips in a Chinese bamboo mat to form a plane web. The outer edge of the web is anchored on an outer ring beam, and an inner ring beam is provided to anchor the FRP strips at the center of the web. The stiffness of the web to resist various loads is derived from the initial prestressing during the “weaving” stage and the additional tensioning as a result of the outofplane movement of the inner ring beam. As a result of the high strengthto weight ratio of FRP, this new structural form offers an attractive option for the construction of spatial structures with spans longer than are possible with conventional structural materials. In this paper, the basic layout and construction procedure for a simple FRPWWS is first presented. Three basic weaving patterns are next explained. Several variations of the basic structural system are also proposed. A simple mechanical model is presented for the deformation of individual FRP strips. Results from a finite element analysis of an example structure are also given. The results of these analyses confirm the feasibility of the FRPWWS. 1 INTRODUCTION FRP is a new kind of structural material, whose use in civil engineering has been actively explored in recent years. Due to its favorable properties like 中國(guó)石油大學(xué)（華東 ） 本科畢業(yè)設(shè)計(jì)（論文） 2 corrosion resistance, high strength, low weight, good fatigue performance, and low maintenance cost, it is considered to be an ideal material for constructing longspan structures in the new century. However, its mechanical properties are distinctly different from those of traditional structural materials in some aspects, such as its anisotropy. Due to the unique properties of FRP, it is necessary to explore new forms of largespan structures for its efficient use and for achieving spans larger than are possible with traditional materials. For example, Maeda et al. (2020) have conceived a 5000 meterspan suspension bridge using FRP. The FRP woven web structure, a new largespan structural system, is presented in this paper. This new system represents an attempt aimed at the efficient utilization of the unique characteristics of FRP in a largespan roof. In an FRPWWS, the high strength FRP strips are woven like bamboo strips in a Chinese bamboo mat to form a plane web. The outer edge of the web is anchored on an outer ring beam, and an inner ring beam is provided to anchor the FRP strips at the center of the web. A smallscale model of a simple FRPWWS is shown in Figure 1. The FRP strips are initially prestressed to a limited extent to keep them straight during “weaving”. Then, the FRP web is tensioned by a displacement of the inner ring beam in the outof plane direction, which is effected either by a set of prestressed tendons or by suspending a heavy mass from the inner ring beam. As a result, a tensioned FRP web, whose geometric stiffness is able to resist a variety of loads, forms a largespan roof system with the two rings. The FRPWWS resembles the cable structure and the cablemembrane structure: their members are flexible。 and the geometric stiffness resulting from 中國(guó)石油大學(xué)（華東 ） 本科畢業(yè)設(shè)計(jì)（論文） 3 tension is utilized to resist loads. However, the FRPWWS has its unique advantages: (1) the FRP strips are ideal for super largespan structures due to their low selfweight and their superior material properties in the lengthwise direction, which are efficiently utilized, while the weakness of inferior properties in the transverse directions is not exposed。 (2) significant damping can be expected to arise from friction at joints between FRP strips, which can enhance the resistance of the structure to wind and earthquake loads。 (3) the regular weaving pattern leads to an aesthetically pleasing surface。 and (4) the corrosion resistance of FRP and the ease of installation because of its lightweight translate into low maintenance costs. In this paper, the basic layout and construction procedure for a simple FRPWWS system is presented in detail. The weaving patterns in plane are summarized into three types. Some spatial FRPWWS forms for practical applications are also proposed. A simple mechanical model for individual FRP strips in the web is presented. Results from the finite element analysis of a simple FRPWWS are also described. 2 LAYOUT OF A SIMPLE FRPWWS A simple FRP woven web structure is posed of a FRP woven web, an outer ring beam and an inner ring beam for anchorage, and an additional weight or a set of prestressed tendons, as shown in Figure 1. The web is woven with FRP strips, and CFRP strips or other highperformance hybrid FRP strips are suggested. CFRP strips, which have 中國(guó)石油大學(xué)（華東 ） 本科畢業(yè)設(shè)計(jì)（論文） 4 been widely used to strengthen concrete structures in recent years, are manufactured by pultrusion in general, with a fiber volume ratio of about 65%. The properties of two representative products made in China a