正交胶合竹木（CLBT）研究进展

正交胶合木(CLT)结构因其具有施工便捷、结构性能优良和易于维护保养等优点在欧洲和北美等地获得了广泛关注，并越来越普遍地应用于多层甚至高层建筑之中。我国有丰富的竹资源，同时竹材具有良好的力学性能、可加工性和耐久性。在可工业化生产的结构用胶合竹(Glubam)基础上，作者借鉴CLT的概念进一步提出了正交或交错胶合竹木(简称CLBT或CLTB)。在综述国内外学者在正交胶合木结构的力学性能、连接方式和抗震性能等方面的研究成果基础上，介绍正交胶合竹木的力学与物理性能试验结果，包括正交胶合竹木板梁的弯曲试验、柱的轴心受压试验以及墙体的热学和声学性能试验等，提出基于高阶剪切变形理论的解析模型用以估算CLBT梁、柱在相应荷载作用下的变形量，并通过试验验证该模型的准确性。相关初步研究结果表明：正交胶合竹木CLBT有良好的力学性能和与正交胶合木相当的保温隔热及隔声性能；采用国产速生杨木与Glubam胶合竹组坯制备的正交胶合竹木梁板的力学性能不逊于采用进口木材的同类竹木梁板。因此，正交胶合竹木的研发与应用将有助于进一步合理利用我国的速生林资源和丰富的竹资源；竹木等生物质材料在建筑中的应用对于实现碳中和具有重要的促进意义。

Research progress of cross-laminated timber and bamboo (CLBT)

Cross-laminated timber (CLT) has currently drawn wide attention and is used increasingly in multi-story and even high-rise buildings worldwide, due to its excellent constructability, good structural and maintenance performance. China has abundant bamboo forest resources and bamboo has good physical and mechanical properties, machinability and durability. Inspired by the CLT development and based on the extensive experiences of developing industrialized glued-laminated bamboo (glubam) structures, the cross-laminated bamboo and timber (CLBT or CLTB) was proposed. On the basis of a review on international and domestic research on mechanical properties, connection types and seismic performance of CLT structures, the research findings on mechanical behaviors of CLBT components and physical properties of CLBT wall panels were summarized, including bending test of CLBT beams, axial compression test of CLBT columns, thermal and acoustic performance test of CLBT wall panels, etc.An analytical model based on the high-order shear deformation theory was also proposed to predict the deformation of CLBT beams and columns, and the accuracy of the model was verified through comparison with the test results. The research results show that CLBT has good mechanical properties, thermal insulation and sound insulation comparable to CLT. The study also indicates that the mechanical properties of CLBT beams made of glubam panels and fast-growing domestic poplar wood are as good as those of CLBT beams using imported timber. Therefore, the development and application of the CLBT structure are helpful of finding a new way for the rational utilization of the abundant fast-growing domestic wood and bamboo resources. The application of biomaterials such as timber and bamboo in construction is of great significance for achieving carbon neutrality.