结构用共挤木塑复合材承压性能研究OA北大核心CSTPCD

Structural co-extruded wood-plastic composites(Co-WPC)were prepared using PVC-based wood-plastic composites and acrylonitrile-styrene copolymer(AS)engineering plastics as raw materials,made through a co-extrusion molding process.To promote the application of Co-WPC in the field of reticulated shell structures,bearing tests under full bolt-hole loading were conducted on the Co-WPC,with bolt diameter and loading direction as variables.The bearing model was analyzed using finite element analysis.The results showed that as the bolt diameter increased,the bearing strength decreased.It reached a minimum value of 39.0 MPa at a bolt diameter of 10 mm.For the same bolt diameter,the bearing strength of specimens loaded perpendicular to the extrusion direction was greater than that of those loaded parallel to the extrusion direction.The relative error between the simulated and experimental bearing strengths is controlled within 15％.The simulated load-displacement curves correlated well with the experimental curves.Based on current wood design standards from various countries and the experimental data,a formula for calculating the bearing strength of Co-WPC was proposed.The formula accurately predicted the bearing strength,with a relative error within 10％.