统计技术在玻璃钢制品过程控制中的应用

统计技术是质量管理中进行质量分析，质量控制和质量改进的必要工具。本文阐述了该技术在玻璃钢过程控制中的应用，重点探讨了其应用范围，作用，方法及相关说明。力求为玻璃钢过程控制提供科学系统的分析方法。     

GRIP管混凝土组合结构压弯构件非线性全过程分析

本文应用细观力学、经典层板理论、平截面假定、FRP约束混凝土本构模型及数值积分对GFRP管混凝土组合结构压弯构件进行了非线性全过程分析。通过理论计算发现GFRP管混凝土组合结构能有效地提高构件的承载力，且构件具有良好的变形能力。FRP壳体参与承载且有效地约束混凝土的变形，显著提高核心混凝土强度和变形能力。文中讨论了轴压比、长细比、径厚比、混凝土强度等级、纵筋配筋率、铺层角变化对极限水平荷载和极限水平位移的影响，从而得到了一些有益的结论。     

玻璃钢件固化成型中变形现象的剖析

结合实例剖析由产品结构、成型工艺和工艺装备等主要因素影响的复合夹层结构玻璃钢件和实体玻璃钢件在固化成型中的变形现象，并指出了预防变形的各相应有效措施。     

Monitoring of tool wear using measured machining forces and neuro-fuzzy modelling approaches during machining of GFRP composites

The challenges of machining, particularly milling, glass fibre-reinforced polymer (GFRP) composites are their abrasiveness (which lead to excessive tool wear) and susceptible to workpiece damage when improper machining parameters are used. It is imperative that the condition of cutting tool being monitored during the machining process of GFRP composites so as to re-compensating the effect of tool wear on the machined components. Until recently, empirical data on tool wear monitoring of this material during end milling process is still limited in existing literature. Thus, this paper presents the development and evaluation of tool condition monitoring technique using measured machining force data and Adaptive Network-Based Fuzzy Inference Systems during end milling of the GFRP composites. The proposed modelling approaches employ two different data partitioning techniques in improving the predictability of machinability response. Results show that superior predictability of tool wear was observed when using feed force data for both data partitioning techniques. In particular, the ANFIS models were able to match the nonlinear relationship of tool wear and feed force highly effective compared to that of the simple power law of regression trend. This was confirmed through two statistical indices, namely r² and root mean square error (RMSE), performed on training as well as checking datasets.     

Mixed mode fracture toughness of GFRP composites

Glass fibre reinforced polymer (GFRP) composites are used in a wide range of applications as a structural material. They have high specific mechanical properties but are prone to delamination as a result of manufacturing defects and impact/shock loading. The ability of the structure to continue to carry load after damage and the subsequent propensity of the damage to propagate are important considerations for the design of damage tolerant composite structures. In order to accurately predict the stability of damage under load, relevant mechanical properties of the material must be accurately determined. In particular, mixed mode fracture toughness data is required in order to study the damage criticality in such structures. This paper describes an experimental study to determine Mixed Mode fracture toughness for thick glass/vinylester specimens. The test methodology used for the experiments and its difficulties will be discussed. Mixed mode fracture toughness results are presented, as are Mode I and Mode II fracture toughness results obtained via Double Cantilever Beam (DCB) and End Notch Flexure (ENF) tests, respectively.     

Use of FRP for RC Frames in Seismic Zones: Part II. Performance of Steel-Free GFRP-Reinforced Beam-Column Joints

The use of FRP as reinforcement in concrete structures has been growing rapidly due to its advantages over conventional steel reinforcement (e.g., corrosion resistance, light weight, magnetic neutrality). A potential application of FRP reinforcement is in structural concrete frames. However, current seismic design standards and detailing criteria for beam-column joints were established for steel reinforcement and may be unsuitable for FRP reinforcement due to its different mechanical properties. During recent earthquakes, many structural collapses were initiated or caused by beam-column joint failures. Since there are no detailed specifications for the application of FRP reinforcement in seismic zones, research is needed to gain a better understanding of the behaviour of FRP-reinforced concrete under seismic loading. In this study, two full-scale beam-column joint specimens reinforced with steel and GFRP, respectively, were tested in order to investigate their performance in the event of an earthquake. The control steel-reinforced specimen is detailed according to the Canadian Code (CSA A23.3-94) recommendations. The GFRP-reinforced specimen is detailed in a similar scheme but using a GFRP grid. The behaviour of the two specimens under reversed cyclic loading, their load-storey drift envelope relationship and energy dissipation ability were compared. The GFRP-reinforced specimen showed a predominantly elastic behaviour up to failure. While its energy dissipation was low, its performance was acceptable in terms of total storey drift demand.     

GFRP管混凝土柱的GFRP管拼接方法

为解决实际工程中GFRP管长度不足的问题,需要将两个或两个以上GFRP管拼接起来,并保证拼接处的力学性能,设计了基于钢筋、钢板锚筋及钢管连接件的拼接GFRP管钢筋混凝土试件,并通过试验,研究了拼接GFRP管钢筋混凝土轴心受压性能.试验结果表明:当加载到35%Pu(极限荷载)左右时,在GFRP管的表面出现白纹;当加载到65%Pu左右时,GFRP管开始产生套箍约束作用,继续加载,套箍约束作用继续存在.拼接试件的破坏以GFRP管的断裂为标志,破坏发生在距构件端部250 mm处,而对比试件的破坏发生在沿试件长度方向的中间位置;试验所设计的3种连接方式均能够保证拼接GFRP管钢筋混凝土轴心受压试件正常工作.     

GFRP管增强混凝土结构的轴压强度临界值

为完善和发展FRP管增强混凝土结构的设计与计算理论，在确定组合结构轴心受压时所经历的3个典型工作阶段后，运用经典层合板理论和组分材料相互约束条件，归纳出弹塑性阶段终点时约束管和核心混凝土的轴向应力预测方程．在壳体与核心柱体界面无黏接力的情况下，用合成法得到GFRP管增强混凝土柱轴心受压状态下的强度临界值，从而可以预测任意组合下该种结构的工作强度．分析了各性能参数对GFRP管混凝土结构轴心受压强度设计指标的影响，结果表明，纤维缠绕角与组合结构的强度临界值之间呈非线性变化状态，且在不同的缠绕角范围内，强度临界值呈现出不同的变化趋势．而含量比与强度临界值之间存在近似线性关系，且成正比．     

GFRP-花旗松胶合木夹芯桥面板受弯性能试验与结构设计

采用花旗松胶合木作为芯材,玻璃纤维增强复合材料（GFRP）作为面层制备夹芯结构桥面板,在对花旗松胶合木芯材和 GFRP 开展基本力学性能试验研究的基础上,开展了 GFRP-花旗松胶合木夹芯梁的受弯性能试验,得出了其荷载-跨中挠度曲线与 GFRP 荷载-跨中应变曲线,并对抗弯刚度测试值与理论计算值进行了对比;针对某 GFRP-花旗松胶合木桥面板,提出了完整的结构设计流程,给出了桥面板的合理设计参数。研究结果表明：GFRP-花旗松胶合木桥面板应用于钢梁-复合材料桥面板组合桥梁结构较为可行。     

黄泛区粉土-玻璃纤维增强聚合物复合材料布界面摩擦特性试验

玻璃纤维增强聚合物复合材料（GFRP）强度高、耐热性好、抗碱性腐蚀能力较强,目前已广泛的应用于土木工程领域中。为了研究黄泛区粉土和GFRP布之间的界面摩擦特性,利用TZY-1型土工合成材料综合测定仪开展了直剪摩擦试验研究,分析了含水率、压实度和法向应力对界面摩擦特性的影响。结果表明,黄泛区粉土和GFRP布的界面摩擦强度随着压实度的增大而增大;界面摩擦强度在土体的含水率最优时达到最大,超过最优含水率后会下降;界面抗剪力随着法向应力的增大而增大,摩擦系数随着法向应力的增大而降低。