高强钢筋高强混凝土预应力梁短期刚度研究

Study on the short-time stiffness of prestressed high-strength concrete beams with high-strength bars

通过对12根足尺高强钢筋高强混凝土预应力梁的抗弯性能试验,分析了现有规范刚度计算公式的适用性以及换算配筋率、混凝土强度等级等因素对梁短期刚度的影响.研究结果表明,梁的短期刚度随换算配筋率的增大、混凝土强度等级的提高而增强;中美混凝土规范刚度计算公式对于高强钢筋高强混凝土预应力梁仍然适用.试验研究结果可为高强钢筋高强混凝土预应力梁在实际工程中的应用提供参考依据.

In this paper,12 full-scale prestressed high-strength concrete beams with high-strength bars were tested,based on the test results,whether the formulas for calculating the stiffness in the existing codes are suitable was tested,the influence of concrete strength,conversion reinforcing ratio on the stiffness are analysised.The study results indicate that the stiffness increases with higher strength grade of concrete and bigger reinforcing ratio;the stiffness calculated method given in the code of China and America can be used for prestressed high-strength concrete beams.The study provides a reference point for practical application of prestressed high-strength concrete beams with high-strength bars.