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提出了花岗岩石梁嵌入CFRP筋组合石梁技术,并进行了3根嵌入CFRP筋组合石梁和1根普通石梁的受弯性能试验研究。主要试验参数为嵌埋CFRP筋的直径和数量。试验分析了组合石梁的破坏形态、受弯承载力、变形性能、应变分布和CFRP筋的粘结滑移性能。试验结果表明:普通花岗岩石梁达到开裂弯矩时即发生脆性断裂,而通过在梁底受拉区嵌埋CFRP筋可以有效提高石梁受弯承载力和延性。嵌埋CFRP筋组合石梁的受弯承载力随着CFRP筋配筋率的增大而增大。CFRP筋配筋率对组合石梁的受力性能和破坏形态均有明显影响,CFRP筋的强度发挥水平随配筋率的增大而降低,过大的配筋率可能使组合石梁的破坏形态由弯曲破坏转变为剪弯段的剪切破坏。嵌埋CFRP筋组合石梁的粘结锚固性能是影响组合石梁受力性能的重要因素。
The technology of granite stone beam embedded CFRP rib composite stone beam was proposed, and the bending performance test of three embedded CFRP rib composite stone beams and one ordinary stone beam was carried out. The main test parameters are the diameter and number of embedded CFRP bars. The failure mode, flexural capacity, deformation performance, strain distribution and bond-slip properties of CFRP tendons were analyzed. The test results show that the brittle fracture occurs when the ordinary granite stone reaches the cracking moment, and the CFRP tendon embedded in the tension zone at the bottom of the beam can effectively improve the flexural bearing capacity and ductility of the stone. The flexural capacity of CFRP-bar composite stone beams increases with the reinforcement ratio of CFRP bars. CFRP tendon reinforcement ratio of the composite stone beam stress performance and damage morphology have a significant impact on the strength of CFRP tendons to play with the increase of the reinforcement rate decreases, excessive reinforcement ratio may make the composite stone beam damage Morphology changes from bending damage to shear failure of shear section. Bonding and anchoring performance of CFRP-bar composite stone beams is an important factor affecting the mechanical properties of the composite stone beams.