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首页> 外文期刊>Composite Structures >Structural safety of pultruded FRP profiles for global buckling. Part 2: Reliability-based evaluation of safety formats and partial factor calibration
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Structural safety of pultruded FRP profiles for global buckling. Part 2: Reliability-based evaluation of safety formats and partial factor calibration

机译：针刺FRP型材的结构安全性。第2部分：基于可靠性的安全格式评估和部分因素校准

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摘要

This two-part paper presents a study about the structural safety of pultruded fibre-reinforced polymer (FRP) profiles with respect to global buckling phenomena, which often govern their ultimate limit states design: flexural buckling, flexural-torsional buckling and lateral-torsional buckling. The first part [1] presented the resistance models for those buckling mechanisms, the probability models for model uncertainties of resistance, and a preliminary set of partial factors related to the model uncertainty, all consistent with the Eurocodes. Aiming at validating the resistance format proposed and that set of partial factors, this second part presents explicit reliability analyses of pultruded FRP profiles designed for the different global buckling failure mechanisms, so that the design equations proposed comply with the target reliability index recommended in EN 1990 for common structural elements. The reliability-based calibration followed similar methodology of documents that assessed the reliability of design with the Eurocodes, including the stochastic modelling of loads and geometry. Partial factor calibration was made through iterative reliability analyses on representative structural elements defined from the proposed design equations. This calibration process allowed defining (i) recommendations for partial factor gamma(Rd) and (ii) the representative material property used to define gamma(m) for each buckling mechanism. The final part of the paper includes recommendations for future research, towards the validation of assumptions made in this study and the standardization of FRP materials.
机译：这篇两部分纸张介绍了针对全球屈曲现象的拉挤纤维增强聚合物（FRP）型材结构安全性的研究，这些屈曲现象通常控制其最终极限状态设计：弯曲弯曲，弯曲扭转屈曲和横向弯曲。第一部分[1]呈现了那些屈曲机制的电阻模型，用于模型不确定度的模型不确定性的概率模型以及与模型不确定性相关的初步部分因素，所有这些因素都与Eurocode一致。旨在验证所提出的电阻格式以及该组部分因素，第二部分介绍了针对不同全球屈曲故障机制设计的被布鲁德FRP配置文件的明确可靠性分析，因此提出的设计方程符合EN 1990推荐的目标可靠性指数对于共同的结构元素。基于可靠性的校准遵循类似的文件方法，这些文件可以评估与Eurocodes的设计可靠性，包括负载和几何体的随机建模。通过从所提出的设计方程定义的代表性结构元件上的迭代可靠性分析进行了部分因素校准。该校准过程允许定义（i）用于部分因子γ（RD）和（ii）用于为每个屈曲机制定义伽马（m）的代表性材料性能的建议。本文的最后一部分包括对未来研究的建议，以验证本研究中的假设和FRP材料的标准化。

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