- 蘇 駿1,2，錢維民1，柯 驕1
引用本文摘 ? 要：設計了一批受拉區為SFRC、受壓區為SCC的鋼筋復合梁，分析了縱筋配筋率、SFRC替換層鋼纖維體積摻量以及替換層高度對復合梁在四點彎曲荷載作用下的承載力、撓度以及裂縫形態的影響，并與普通混凝土梁進行了對比。通過理論分析計算得出了SFRC/SCC復合梁的承載力表達式，并將理論計算結果與試驗數據進行了對比分析，以驗證表達式的合理性。結果表明：配筋率是提升復合梁承載力的首要因素，1.32%配筋率相對于0.79%配筋率的極限承載力最大可提升24.1%；鋼纖維替換層對復合梁的承載力提升并不明顯，但對于復合梁的撓度與裂縫寬度控制有明顯作用，將替換層高度由50 mm提升至150 mm時，復合梁的撓度和主裂縫寬度最大分別降低了9.2%和77.81%。 Abstract: A batch of reinforced composite beams with SFRC tension zone and SCC compression zone were designed, and the effects longitudinal reinforcement ratio, SFRC replacement layer steel fiber volume content and replacement layer height on the bearing capacity, deflection and crack shape of composite beams under the four-point bending load were analyzed, and compared with ordinary concrete beams. Through theoretical analysis and calculation, the expression of the bearing capacity of SFRC/SCC composite beams was obtained, and the theoretical calculation results were compared with the experimental datas to verify the rationality of the expression. The results show that the reinforcement ratio is the primary factor to improve the bearing capacity of composite beams. Compared with the reinforcement ratio of 0.79%, the ultimate bearing capacity can be increased by 24.1% at the maximum reinforcement ratio of 1.32%. The steel fiber replacement layer does not significantly improve the bearing capacity of composite beams, but it has an obvious effect on the deflection and crack width control of composite beams. When the replacement layer height is increased from 50 mm to 150 mm, the deflection and main crack width of composite beams are reduced by 9.2% and 77.81% respectively.
蘇駿,錢維民,柯驕.SFRC/SCC鋼筋復合梁受彎性能試驗研究[J].混凝土與水泥制品,2021(5):60 -64,70. SU J,QIAN W M,KE J.Experimental Study on the Flexural Performance of SFRC/SCC Reinforced Composite Beams[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):60 -64,70.