摘要
对体外预应力混凝土结构固有频率的分析和计算是研究其动力性能的基础。本文进行了1根直线性体外预应力混凝土简支梁的动力试验,测得了试验梁在张拉阶段的频率变化。为了和试验结果进行对比,本文推导了直线性体外预应力混凝土梁的频率计算公式,对试验梁的自振频率进行了计算,计算结果与试验结果在梁频率的变化趋势及数值上均有较大的出入,最后分析了造成这种误差的原因。
It is important to analyze and calculate natural frequency of concrete structures with external prestressing which is the basis of studying their dynamic properties. Dynamic tests on one simply supported prestressed beam with external linear tendon were carried out, and variation of frequencies of the specie at stage of stretching was deprived. In order to compare calculation results with tests, the paper derives formulas on calculation of natural frequency of simply supported prestressed beam with external linear tendon, the natural frequency of the specie is calculated by the deduced function. It is found that difference in varying tendency of natural frequency between calculation results and tests is great. Finally, the cause of difference between calculation results and tests was presented.
出处
《南阳理工学院学报》
2009年第3期51-53,共3页
Journal of Nanyang Institute of Technology
关键词
体外预应力梁
动力性能
自振频率
刚度修正
Concrete beam with external prestressing
Dynamic property
Natural frequency
Stiffness updating
