频率法测试网架结构杆件轴力影响因素的试验研究

发布时间：2019-03-09 11:06

【摘要】：大跨度空间网架结构健康检测中杆件轴力无损测试方法至关重要。繁杂和不便现场实施的轴力测试已经影响到健康检测的实用性。探索频率法测试杆件轴力影响因素的变化直接关系到该方法的实用性。针对影响频率法测试空间网架结构杆件轴力的因素研究,能使频率法测试结构杆件轴力时可综合考虑各方面因素,得到精确的数据。通过杆件模型试验分别考虑了杆件轴力、杆件长度、截面及边界条件4因素对杆件自身频率的影响,基于梁弯曲振动理论与数值计算对试验结果进行分析。结果表明,杆件长度、截面及边界条件对杆件自身频率影响较大,杆件轴力对杆件频率影响相对较小,但4个因素对杆件频率影响均呈线性变化且影响程度各不同,可以为频率法测试结构杆件频率时提供参考标准。
[Abstract]:The non-destructive testing method of axial force is very important in the health test of long-span space truss structure. The complexity and inconvenience of on-the-spot axial force testing has affected the practicability of health testing. The change of influencing factors of shaft force testing by frequency method is directly related to the practicability of this method. According to the study of the factors that influence the frequency method to test the axial force of the spatial grid structure bar, the accurate data can be obtained by using the frequency method to measure the axial force of the structural bar comprehensively considering all kinds of factors. The effects of axial force, length, cross section and boundary condition on the frequency of the member are considered in the model test. The experimental results are analyzed based on the bending vibration theory and numerical calculation of the beam. The results show that the length, section and boundary condition of the member have a great influence on the frequency of the member itself, while the axial force of the member has little effect on the frequency of the member, but the influence of the four factors on the frequency of the member is linear and the degree of influence is different. It can provide a reference standard for measuring the frequency of structural member by frequency method.
【作者单位】：辽宁工程技术大学建筑工程学院;江苏中和建筑设计有限公司;
【分类号】：TU356

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