论文部分内容阅读
为了推广体外预应力技术在混凝土结构,特别是在低强度混凝土梁加固中的应用,对12根体外预应力加固混凝土梁展开静载试验。结合模型梁抗弯性能的试验研究,重点分析预应力筋应力增量对抗弯承载力计算的影响。研究成果表明:预应力筋应力增量是影响体外预应力混凝土梁抗弯承载力计算精度的主要因素,试验结果表明,JGJ/T 92—2004《无粘结预应力混凝土结构技术规程》中关于体外预应力应力增量值100 MPa明显偏低,建议修订为170 MPa。
In order to promote the application of external prestressing technology in concrete structures, especially in the reinforcement of low-strength concrete beams, static load tests were carried out on 12 external prestressed concrete beams. Combined with the experimental study of the flexural behavior of the beam, the impact of the prestressing tendon stress increment on the calculation of flexural capacity was analyzed emphatically. The research results show that the stress increment of prestressing tendons is the main factor that affects the calculation precision of flexural capacity of external prestressed concrete beams. The experimental results show that in JGJ / T 92-2004 Technical Specification of Unbonded Prestressed Concrete Structures, The increment of stress and stress is obviously lower than 100 MPa. It is suggested to be revised to 170 MPa.