大厚度旋切单板胶合板覆面承重型木质结构保温板的抗侧性能OA

Load-bearing structural insulated panels(SIPs)were fabricated using thick plywood made of rotary-peeled from radiata pine(Pinus radiata)veneer as the sheathing material and expanded polystyrene(EPS)foam as the insulation core.Four groups of full-scale SIP specimens were designed according to two sheathing material thicknesses,30 and 60 mm,and the presence or absence of EPS core infill.Monotonic and reversed cyclic loading tests were conducted to investigate the failure modes of the SIP specimens and to determine key performance parameters,including ultimate load,shear strength,stiffness,ductility,and energy dissipation capacity.The results showed that:1)increasing the thickness of the sheathing material enhanced the load-bearing capacity and stiffness of the SIPs.Under the monotonic loading,the ultimate load of SIP specimens with 60-mm-thick sheathing material was 1.88 times that of specimens with 30-mm-thick sheathing material when filled with EPS,and 1.77 times that of specimens without EPS infill;2)EPS infill effectively improved the ductility and energy dissipation capacity of the SIP specimens.Under the monotonic loading,the energy dissipation of the EPS-filled SIP specimens was 2.02 times that of specimens without EPS infill for the 60-mm-thick sheathing material group.Under the reversed cyclic loading,the energy dissipation of the EPS-filled SIP specimens was 1.67 times that of specimens without EPS infill for the 60-mm-thick sheathing material group;3)EPS changed the failure mode from localized brittle tearing around bolt holes in the sheathing material to progressive mixed damage at multiple locations,including the stud-sheathing material interface and the stud-bottom plate connections,thereby improving the structural integrity;4)under the reversed cyclic loading,the ultimate load-bearing capacity of the SIP specimens was generally lower than that obtained under monotonic loading,and asymmetric mechanical behavior was observed in the push and pull directions.This study demonstrated that the thickness of the sheathing material was a critical factor affecting the lateral racking performance and deformation capacities of SIPs,while EPS infill was a key measure for improving ductility and energy dissipation capacity.The combined use of increased sheathing material thickness and EPS infill could synergistically enhance the lateral racking performance of SIPs,providing experimental support and design reference for the application of such components in mid-and high-rise buildings and other scenarios with high load-bearing requirements.