Pultruded sandwich panel (PSP) usually has light weight, but its flexural performance is limited by the weak shear strength. Filling into expanded polystyrene (EPS) mortar can effectively improve the mechanical properties. The bending performance and failure mode of the EPS mortar-filled PSP were investigated by flexural testing. The ultimate bearing capacity improved from 49.562 kN for unfilled PSP to 72.065 kN for EPS mortar-filled PSP. The equivalent shear modulus is increased from 140.068 to 354.685 MPa. Increasing the EPS mortar’s density, the failure of EPS mortar-filled PSP would change from core shear failure, local indentation failure to overall shear failure. According to the thermal insulation tests, which shows EPS mortar-filled PSPs have excellent thermal insulation, the thermal insulation performance of different types of filler PSPs are obtained. The research on the mechanical and thermal insulation properties of EPS mortar-filled PSP can provide technical support for its application in engineering.

拉挤夹芯板（PSP）通常重量较轻，但其抗弯性能受弱的剪切强度限制。填充到膨胀聚苯乙烯（EPS）砂浆中可以有效地改善机械性能。通过挠曲试验研究了EPS砂浆填充PSP的弯曲性能和破坏模式。极限承载力从未填充PSP的49.562 kN提高到EPS砂浆填充PSP的72.065 kN。当量剪切模量从140.068 MPa增加到354.685 MPa。增加EPS砂浆的密度，EPS砂浆填充的PSP的破坏会从岩心剪切破坏，局部压痕破坏变为整体剪切破坏。根据隔热测试，这表明EPS砂浆填充的PSP具有出色的隔热性能，获得了不同类型填充物PSP的隔热性能。对EPS砂浆填充PSP的力学和隔热性能的研究可为其在工程中的应用提供技术支持。