Abstract: To explore new wall panel materials and structural systems that are lightweight, high-strength, and have good thermal insulation properties suitable for prefabricated steel structure buildings, a new type of FRP grid reinforced fiber concrete sandwich composite wall panel was proposed in this paper, referred to as an FGRC sandwich composite wall panel. To study the flexural performance and failure modes of the FGRC sandwich composite wall panels, bending performance tests were designed and conducted on two FGRC sandwich composite wall panels with dimensions of 4 m×3 m and thicknesses of 100 mm and 150 mm respectively. The test results show that the main failure mode of the FGRC sandwich composite wall panels is flexural failure, with excellent interface connection performance. The ultimate flexural load capacity can reach up to 3.11 kN/m² and 4.05 kN/m². The ultimate fire resistance times are 1.1 hours and 1.5 hours, and the structural thermal resistances are 1.41 (m²·K)/W and 1.72 (m²·K)/W, respectively. The air-borne sound insulation and frequency correction amounts are 39(-2;-3) dB and 39(0;-2) dB, respectively. Overall, this wall panel shows significant application value.

Key words: fiber reinforced polymer grid, fiber grid reinforced concrete (FGRC), composite wall panel, FRP connectors, performance testing, load-bearing performance