In this paper, an extensive study on the web crippling behaviour of GFRP wide-flange (WF) section profiles with centred web perforation under interior-two-flange (ITF) loading is reported. Experimental investigation included material characterization tests and full scale web crippling experiments performed on 14 specimens with and without web perforations under ITF loading configuration. To examine the effect of web perforation, perforation sizes were varied between 0.2h and 0.8h (h being the web height). Compared to the intact specimens, the average web crippling strength for perforated specimens with web perforation sizes 0.2h, 0.4h 0.6h and 0.8h was reduced by 14.7%, 22.2%, 24.2% and 41.1%, respectively. Numerical investigations were carried out using the finite element (FE) software, Abaqus and based on validated FE models, parametric studies were performed to study the effects of perforation diameter to web height ratio (a/h) and bearing plate length to web height ratio (N/h) on the web crippling strength. Based on the parametric study, web crippling strength reduction factor was proposed and its suitability was checked with reliability analysis.

在本文中，报告了对内双法兰 (ITF) 载荷下具有中心腹板穿孔的 GFRP 宽法兰 (WF) 截面型材的腹板破坏行为的广泛研究。实验研究包括在 ITF 负载配置下对 14 个有和没有腹板穿孔的样本进行材料特性测试和全尺​​寸腹板瘫痪实验。为了检查幅材穿孔的影响，穿孔尺寸在 0.2小时和 0.8小时之间变化（h是幅材高度）。与完整试样相比，腹板穿孔尺寸为 0.2小时、0.4小时、 0.6小时和 0.8小时的穿孔试样的平均腹板断裂强度分别下降了 14.7%、22.2%、24.2% 和 41.1%。使用有限元 (FE) 软件 Abaqus 进行了数值研究，并基于经过验证的有限元模型，进行了参数研究，以研究穿孔直径与腹板高度比 ( a/h ) 和承重板长度与腹板高度比的影响( N/h ) 对幅材的破坏强度。在参数化研究的基础上，提出了腹板破坏强度折减系数，并通过可靠性分析验证了其适用性。