In the frame of a research project, the structural behaviour in fire of cross-laminated timber rib panels were studied based on numerical investigations. The floor system consists of cross-laminated timber plates rigidly bonded to glued-laminated timber ribs. The numerical investigations comprised uncoupled thermo-mechanical simulations of two types of finite element models, a beam system and a flexible-in-shear multi-layered part, to investigate the influence of the effective width in fire. All models were validated against the experimental results of previously tested full-scale fire resistance tests. A parametric study analysed the composite cross‐sections’ effective width in fire for a parameter range expected in practice and gave proposals depending on the thickness of the CLT layers. For the conservative case of thin CLT layers, a limit value of 60% of the effective width at normal temperature is proposed as effective width in fire.

在一个研究项目的框架内，基于数值研究研究了交叉层压木肋板在火灾中的结构行为。地板系统由刚性粘合到胶合层压木肋的交叉层压木板组成。数值研究包括两种有限元模型（梁系统和剪切柔性多层部件）的非耦合热机械模拟，以研究火灾中有效宽度的影响。所有模型均根据先前测试的全面耐火测试的实验结果进行了验证。一项参数研究分析了复合材料横截面在火灾中的有效宽度，以满足实践中预期的参数范围，并根据 CLT 层的厚度提出了建议。对于薄CLT层的保守情况，建议将常温下有效宽度的60%作为火灾中有效宽度的极限值。