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Shear modulus analysis of cross-laminated timber using picture frame tests and finite element simulations
Materials and Structures ( IF 3.8 ) Pub Date : 2020-08-01 , DOI: 10.1617/s11527-020-01545-1
Jonas Turesson , Sven Berg , Anders Björnfot , Mats Ekevad

Determining the mechanical properties of cross-laminated timber (CLT) panels is an important issue. A property that is particularly important for CLT used as shear walls in buildings is the in-plane shear modulus. In this study, a method to determine the in-plane shear modulus of 3- and 5-layer CLT panels was developed based on picture frame tests and a correction factor evaluated from finite element simulations. The picture frame test is a biaxial test where a panel is simultaneously compressed and tensioned. Two different testing methods are simulated by finite elements: theoretical pure shear models as a reference cases and picture frame models to simulate the picture frame test setup. An equation for calculating the shear modulus from the measured shear stiffnesses in the picture frame tests is developed by comparisons between tests and finite element simulations of the CLT panels. The results show that pure shear conditions are achieved in the central region of the panels. No influence from the size of the tested panels is observed in the finite element simulations.

中文翻译:

使用相框测试和有限元模拟进行交叉层压木材的剪切模量分析

确定交叉层压木材 (CLT) 面板的机械性能是一个重要问题。对于用作建筑物剪力墙的 CLT 而言,一个特别重要的特性是面内剪切模量。在这项研究中,基于相框测试和从有限元模拟评估的校正因子,开发了一种确定 3 层和 5 层 CLT 面板的面内剪切模量的方法。相框测试是一种双轴测试,其中面板同时被压缩和拉伸。通过有限元模拟两种不同的测试方法:作为参考案例的理论纯剪切模型和用于模拟相框测试设置的相框模型。通过比较 CLT 面板的测试和有限元模拟,开发了一个公式,用于根据相框测试中测量的剪切刚度计算剪切模量。结果表明,在面板的中心区域实现了纯剪切条件。在有限元模拟中没有观察到受试板尺寸的影响。
更新日期:2020-08-01
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