现代木结构建筑具有节能、环保等突出特点，但也存在建筑高度低等不足。新型工程木:正交胶合木为发展中高层木建筑提供了材料来源和发展契机。目前，利用正交胶合木作为主要承重材料建造中高层木建筑研究已成为世界，尤其是欧洲和北美木结构行业研究热点和重要发展战略。滚动剪切性能是正交胶合木作为楼板和墙体构件的结构设计和力学性能的关键因素。项目从木材微观构造、锯材横切面宏观构造、产品构造参数和生产工艺等角度全面阐明滚动剪切性能影响机理，定量化锯材横切面宏观构造参数与滚动剪切性能的关系，评价单一因素影响和多因素对滚动剪切性能的耦合效应，采用数字图像相关法分析滚动剪切变形的全场应变和弯曲失效模式，建立一种与实际受力、尺寸和构造等因素相符合的新型滚动剪切评价方式，研究改善滚动剪切性能。研究成果将为科学理解正交胶合木滚动剪切性能提供理论依据，为国内发展中高层木建筑提供材料性能科学依据，促进国内中高层木结构建筑发展。

Modern timber structure has the outstanding advantages, such as energy conservation and environmental protection, however, modern timber structure also has some disadvantage, such as low building height. Cross-laminated timber (CLT) is an innovative engineering wood product, which has provide the material source and chance for developing mid-rise and high-rise buildings. The research of using CLT as the structural material of building has become the research hotspot and development strategy of timber structure industry, especially in Europe and North American. Rolling shear strength and stiffness in CLT has been identified as a key issue that may control the design and performance of CLT floor or wall systems. The influence mechanisms of rolling shear in CLT have been studied in this project, which include the microscopic structure of wood, cross section macroscopic structure of timber, CLT structural parameters and CLT manufacture. The relationships between cross section macroscopic structure and rolling shear was quantified and the single factor effect and multi-factor coupling effect on rolling shear were evaluated in this product. The digital image correlation (DIC) method was used to evaluate the shear strain of rolling shear and bending failure modes of CLT, and a new evaluation method of rolling shear has been developed which met the actual loading environment, product dimension and structure. The modification of rolling shear properties was studied finally. The aims of this product are to provide theoretical explain for master the rolling shear properties in CLT, scientific theory of CLT mechanical properties for developing mid-rise building and high-rise building, and speed the development of mid-rise building and high-rise building in China.