摘要
利用动力学原理推导了体外预应力简支混凝土梁的自振频率计算公式,进行了6根不同布筋方式的体外预应梁的动测试验,理论值与实测值比较发现,计算结果与实测值在张拉预应力阶段的最大误差是12.67%,在加载阶段二者间的最大误差亦在30%以内,还讨论了该公式的主要影响因素及实用性.
A formula for calculating frequency of externally prestressed simply supperted concrete beam is derived from classical frequency equation with considering the influence of axial force and bending moment. Strengthening of six beams with simply supported ends by externally prestressing are experimentally investigated. The comparison of theoretical and the experimental results shows that the maximal percentage error between the numerical and the tested is 12.67% in drawing the prestress tendons. In applying load level, it is within 30%. The main influences and the practical feasibility about the formula are discussed.
出处
《华中科技大学学报（城市科学版）》
CAS
2005年第1期13-15,22,共4页
Journal of Huazhong University of Science and Technology
基金
教育部博士点基金资助项目(20030487016).
关键词
体外预应力简支混凝土梁
自振频率
动测试验
externally prestressed simply supported concrete beam
natural frequency
dynamic test
