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首页> 外文期刊>Composite Structures >Simulation of fire resistance behaviour of pultruded GFRP beams - Part Ⅱ: Stress analysis and failure criteria
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Simulation of fire resistance behaviour of pultruded GFRP beams - Part Ⅱ: Stress analysis and failure criteria

机译：GFRP拉挤梁的耐火性能仿真-第二部分：应力分析与破坏准则。

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This two-part paper presents a numerical study on the fire resistance behaviour of pultruded GFRP profiles with square tubular cross-section simultaneously subjected to four-point bending and the standard fire of ISO 834. The first part [1] presented the numerical models and results focused on the most relevant kinematic issues (deflections and strains), while this second part (present paper) reports numerical results associated to the static issues, particularly the evolution of stress distributions and failure initiation with fire exposure time. The paper first presents and discusses the evolution of stress distributions in both longitudinal and transversal directions of an unprotected GFRP beam under one-side fire exposure (reference beam). Next, the influence of using a fire protection system and exposing the beams to fire in three sides is assessed by comparison with the case of reference beam. Additionally, the Tsai-Hill failure (initiation) criterion was used to identify the zones (sections and points) of GFRP beams that are most sensitive to failure due to high temperatures. The numerical results obtained show that (i) longitudinal stresses across the section become highly nonlinear as a result of temperature increase; (ii) shear stress diagram is severely affected by fire exposure in three sides; (iii) transversal stresses are negligible compared to the longitudinal and shear ones; and (iv) the collapse of beams (considering Tsai-Hill failure analysis) occurs due to top flange and web (top part) failure, which generally agrees with experimental observations.
机译：这篇由两部分组成的论文对具有方形管状横截面的拉挤GFRP型材同时经受四点弯曲和ISO 834的标准耐火性能进行了数值研究。第一部分[1]介绍了数值模型和结果集中在最相关的运动学问题（挠度和应变）上，而第二部分（本论文）报告了与静态问题相关的数值结果，尤其是应力分布的演变和着火时间引起的破坏。本文首先介绍并讨论了在一侧火灾（参考光束）作用下未保护的GFRP梁在纵向和横向方向上的应力分布演变。接下来，通过与参考光束的情况进行比较，来评估使用防火系统并将光束暴露在三个侧面的影响。此外，蔡-希尔失效（初始化）准则用于识别对高温造成的失效最敏感的GFRP梁的区域（截面和点）。数值结果表明：（i）由于温度升高，截面上的纵向应力变得高度非线性； （ii）切应力图在三个侧面都受到火灾的严重影响； （iii）与纵向和剪切应力相比，横向应力可以忽略不计； （iv）梁的坍塌（考虑到Tsai-Hill失效分析）是由于顶部翼缘和腹板（顶部）失效而引起的，通常与实验观察结果一致。

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