关键词: 木质薄壁结构材, 杨木, 玻璃纤维布, 复合型材

Abstract: [Objective] The use of poplar veneer for the preparation of Cee-sections thin-walled timber structure can be used to investigate its axial compression performance and buckling deformation mode to provide the basis for the use in architecture.[Method] Based on the cross-sectional form of cold-formed thin-walled section steel, the impact of Cee-sections thin-walled timber structure of the assemble pattern, glass fiber cloth(GFC),curling, thickness and other factors on Cee-sections thin-walled timber structure short column axial compression properties can be explored.[Result] The result showed that the average ultimate loads of assemble pattern along the grain of veneer, assemble pattern surface layer cross grain and core layer along the grain of veneer and assemble pattern grain staggered of veneer were 12.5,14.6 and 12.97 kN respectively. The section validity of the GFC-poplar veneer composite Cee-sections thin-walled timber structure specimen is large overall, ranging from 46.46% to 50.21%. Compared assemble pattern surface layer GFC and core layer along the grain of veneer with assemble pattern surface layer cross grain and core layer along the grain of veneer, when replaced the transverse bending veneer with GFC, the average cross-sectional area reduced by 26.90%,the mass reduced by 5.17%,but the limit load increased by 8.63%. Compared assemble pattern outer angular surface layer GFC and core layer along the grain of veneer with assemble pattern surface layer GFC and core layer along the grain of veneer,the limit load reduced by 34.17%,and the local buckling occurred at the middle of the flange and web. Assemble pattern surface layer GFC and core layer along the grain of veneer, lip width 25 mm assemble pattern surface layer GFC and core layer along the grain of veneer and lip width 50 mm assemble pattern surface layer GFC and core layer along the grain of veneer groups had the same assemble pattern and the lip dimension were respectively 0, 25 and 50 mm, corresponding to the actual ultimate bearing capacity were 15.86,16.76 and 18.98 kN. Compared with lip width 50 mm assemble pattern surface layer GFC and core layer along the grain of veneer, the thickness of the core layer of the lip width 50 mm assemble pattern surface layer GFC and core layer along the grain of thickening veneer group increased by 52.96%, the average weight per meter increased by 33.33%, and the ultimate load increased by 90.31%.[Conclusion] Assemble pattern surface layer cross grain and core layer along the grain of veneer is more reasonable than assemble pattern along the grain of veneer and assemble pattern grain staggered of veneer in the same layer blank of Cee-sections thin-walled timber structure, and its axial bearing performance is good. When GFC is used instead of the striated curved veneer, the axial bearing capacity of Cee-sections thin-walled timber structure can be enhanced and the plasticity failure mode can be showed. Only partly pasting GFC on the surface corner of Cee-sections thin-walled timber structure can't improve the axial bearing performance of no curling Cee-sections thin-walled timber structure. The curl has a strengthening effect on the axial bearing capacity of Cee-sections thin-walled timber structure, and the axial bearing capacity of the specimen increases with the increase of curl size in the range of 0-50 mm lip width. With the increase of Cee-sections thin-walled timber structure core along the monolithic board thickness, C profile specimen axial load capacity also increased.

Key words: thin-walled timber structure, poplar, glass fiber cloth, composite profile