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为研究体外预应力技术对石质构件的加固效果,对6个足尺石梁进行了受弯性能试验研究,其中3个为未加固对比石梁,主要分析了石梁的破坏形态及受弯承载能力。试验结果表明:加固后石梁的极限承载能力有所提高,变形能力有所改善;石材开裂后,由于预应力钢绞线的作用,石梁仍有一定的承载能力,即承载力裕量。最后提出了加固石梁受弯承载力的简化计算公式,对实际加固修复工程有一定的指导意义。
In order to study the reinforcement effect of external prestressing technology on stony members, 6 full-scale stone beams were tested for flexural behavior, of which 3 were unreinforced contrast stone beams, mainly analyzing the failure modes of the stone beams and bending Carrying capacity. The test results show that the ultimate bearing capacity of stone girders has been improved and the deformation capacity improved. After the stone cracking, due to the effect of prestressed steel strands, the bearing capacity of the stone girders still has a certain bearing capacity. Finally, the simplified calculation formula of the flexural bearing capacity of reinforced stone beams is proposed, which has certain guiding significance for the actual reinforcement and restoration engineering.