直线布筋体外预应力混凝土简支梁自振频率分析

Analysis of Natural Frequency of Simply Supported Prestressed Concrete Beam with External Linear Tendon

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。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,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出入的原因。

It is important to analyze and calculate natural trequency ot concrete structures with external pres(?)essing 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 induced formulas on calculation of natural frequency of simply supported prestressed beam with external linear tendon,with which natural frequency of the specie was calculated.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.