全预应力砼梁动力性能试验研究

该文进行了2根无粘结全预应力简支梁的动力试验,结果表明:预应力梁的固有频率随着预应力的增加而增加,这与Clough提出的轴力作用下均质、各向同性线弹性材料梁的理论分析结果相反。引起这个结果的因素很多,该文主要通过探讨由弹性模量E的变化来分析引起的刚度的变化,从而导致频率的变化。该文提出了相应的修正公式,并进行了四个公式的计算结果对比。计算表明:该文提供的方法具有较好的适用性,理论分析和试验结果吻合较好。

EXPERIMENTAL STUDY ON DYNAMIC BEHAVIOR OF FULL-PRESTRESSED CONCRETE BEAMS

The dynamic test of two full-prestressed concrete beams was carried out. The test results indicate that frequencies of those beams grow in step with the prestressing force. It's opposite to the analysis of dynamic characteristic of isotropic material beams subjected to axial compressive force. There are many factors for this result. This paper discusses the change of the elastic modulus results in the stiffness change, which then changes the frequencies. A modified formula was proposed, and the comparison of calculation results was taken. The results indicate that the method of this paper has a good applicability, the experimental results agree well with the theoretical analysis.