【作者】 齐玉军；

【导师】 叶列平； 冯鹏；

【作者基本信息】 清华大学 ， 土木工程， 2011， 博士

【摘要】 FRP（纤维增强复合材料）编织网结构是采用FRP板条编织成网和经整体张拉形成的一种新型屋盖结构体系，其中FRP板条主要承受轴向拉力，可发挥FRP轻质高强的特点，从而实现超大跨度。本文以200m以上跨度的大型屋盖结构为背景，系统研究了FRP编织网结构的几何构造、施工张拉成形和使用阶段的受力性能，最终提出了FRP编织网结构的设计方法。首先，研究了FRP编织网结构的几何构造问题。对不同形式的编织网面进行几何构成研究，建立了数学表达方法；提出整体性最好的“完善编织”的概念，证明了其存在性定理，提出了完善编织网面程序化求解流程；通过两个编织网模型的制作，验证了网面编织施工的可行性。通过研究，建立了任意编织网几何构造的数学分析方法和完善编织的实现，解决了FRP编织网结构的几何构造问题。其次，通过两个1/10比例结构模型试验，研究了FRP编织网结构整体成形控制和使用阶段的力学性能。试验结果表明：施工阶段通过整体张拉能方便有效的实现FRP编织网结构的成形控制；使用中该结构体系具有很高的承载能力，且在卸载后变形可回复；超载时个别板条的局部破坏不会造成结构体系的连续破坏。通过试验研究，首次获得了FRP编织网结构的整体力学行为和破坏特征。随后，以模型试验为基础研究了FRP编织网结构的理论分析方法和有限元分析方法。研究了单根FRP板条的基本力学方程和求解误差，以此为基础建立了简单FRP编织网结构的理论分析方法。研究了采用有限元软件ANSYS模拟FRP编织网结构时的单元选取、约束设置以及构造参数选取等关键问题，分析了板条自重、锚具变形和交点滑移对编织网结构成形控制和力学分析的影响规律。从而在计算理论和数值模拟两方面建立了FRP编织网结构的分析方法。在此基础上，进行了大量数值计算，分析了结构设计参数对整体张拉比、板条最大应力和结构变形等结构性能关键参数的影响规律，获得了FRP编织网结构设计中关键参数的合理取值范围。最后，提出了FRP编织网结构的设计流程；并以一个跨度250m的体育场为例，设计了3个不同形式的FRP编织网屋面结构，验证了该设计方法的有效性。通过本文研究，解决了FRP编织网结构设计应用中的主要问题，同时也证明了这种新型结构体系具有良好的受力性能，在超大跨结构中具有良好的应用前景。更多还原

【Abstract】 FRP (Fiber Reinforced Polymer) WWS (woven web structure) is aninnovative roof structural system by weaving FRP strips into a web andstressing the web in integral tension process. Large span FRP WWS roof can berealized due to efficiently utilization of the higher strength/weight ratio of FRPcomposites which keep in an axially tensile state in WWS. Aimming to the roofspan larger than200meters, the key issues of FRP WWS, including geometricconfiguration, shape forming tension process, and mechanical performance inservice, are investigated in this dissertation. Based on the above systematicresearch, the design method for FRP WWS is proposedFirstly, the geometric configuration of FRP WWS is studied. Differentweaving patterns are analyzed in geometric, a matrix approach for themathematical description is proposed. The concept of Completed WeavingConfiguration is presented as it can ensure the most compact assembly of stripsinto a roof structure. The existence for completed woven webs is proven, and anapproach to make a web to be completed woven is proposed and pragramed.Then two real webs are woven by strips, the practical operation verified theconstruction feasibility of woven webs. In this part, the mathematical analyzingmethod for geometric configuration of arbitrary web is achieved and thecomplete configuration can be determined. The problems on geometricconfiguration of FRP WWS are solved.Secondly, the tension process and mechanical performance in the servicestage of FRP WWS are studied by test of two1/10scaled models. Theexperimental results show following conclusions: in construction strage, theintegrated tension process is a simple and effective way to realize formcontrolling; in service stage, FRP WWS possesses high load-carrying capacityand good recoverable capacity during unloading; under overloadin, failure ofsingle strip can hardly trigger progressive collapse of the whole structure. Bythe test, the integral mechanical performance and failure mode of FRP WWS aredisplayed in the first time. Then, the theoretical analysis methods as well as FEA (finite elementanalysis) method of FRP WWS are developed following the experiments. Thefundamental mechanical equations and solving error of single FRP strip arestudied, and the theoretical analysis methods for FRP WWS are acquired. InFEA modeling with ANSYS, the key topics including element types, boundarycondition and parameters on details are discussed. The effects of strip selfweight, anchorage local deformation and slip-friction to the prestressing processand service behavior are analyzed. Thus, two analysis approaches in theoreticaland FEA for FRP WWS are formed.Based on the methods, plenty of numerical calculations are conducted toanalyze the effect of design parameters to out-plane tension ratio, maximumstress and structure deformation. The reasonable value ranges for parameters aresuggested. Finally, the design process for FRP WWS is suggested. As anexample, three different FRP WWS for a250meters span roof of stadium aredesigned. It proves that the design process is valid.The major contribution of this dissertation is that key problems in thedesign and application of FRP WWS have been solved. By realizing thisstructural concept by two models, the mechanical performance of thisinnovative system was thoroughly testified. From practical perspective, FRPWWS has a promising future and convincing feature for the application inlarge-span structural system.更多还原