无黏结预应力型钢混凝土梁受弯承载力试验研究

摘要

为探讨无黏结预应力型钢混凝土梁受弯承载力状况,采用试验手段研究5根无黏结预应力型钢混凝土梁、1根无黏结预应力混凝土梁和1根型钢混凝土梁的受弯性能,通过详细分析其裂缝形态、受力性能及无黏结预应力筋应力增量变化规律,基于钢筋混凝土结构理论,提出无黏结预应力型钢混凝土梁正截面受弯承载力计算公式,公式计算结果与试验结果吻合较好.%This paper studied the flexural performance of five unbonded prestressed steel reinforced concrete beams (USRCB), one unbonded prestressed concrete beam (UPCB) and one steel reinforced concrete beam (SRCB) by experiment. Crack modes, flexural performance and variety law of stress increment of unbonded prestressed tendons were analyzed in detail. Based on the theory of reinforcement concrete structure, flexural capacity formula of USRCB was proposed and calculation results was in good agreement with the test results. The article has certain innovation and practical value.