CAJ | 학술논문

水泥混凝土路面板脱空程度与其振动特征有较好的相关性,为准确获取路面板的竖向自振频率,通过布设传感器,获取不同脱空程度路面板在环境激励振动时程曲线及瞬态激励后的衰减自由振动波形,并对其分别采用傅里变换理及最大熵谱法进行自振频率分析.研究结果表明,在进行自振频率测试及分析时应采用多种方法综合分析,以免造成误判;瞬态激励下路面板的振动幅值比环境激励情况下的振动幅值大,可以采用最大熵谱法对激励后的自由测试衰减振动进行分析,结果更为清晰准确.这些研究,可为今后路面板的脱空检测及自振频率分析提供一定参考.
수니혼응토로면판탈공정도여기진동특정유교호적상관성,위준학획취로면판적수향자진빈솔,통과포설전감기,획취불동탈공정도로면판재배경격려진동시정곡선급순태격려후적쇠감자유진동파형,병대기분별채용부리변환리급최대적보법진행자진빈솔분석.연구결과표명,재진행자진빈솔측시급분석시응채용다충방법종합분석,이면조성오판;순태격려하로면판적진동폭치비배경격려정황하적진동폭치대,가이채용최대적보법대격려후적자유측시쇠감진동진행분석,결과경위청석준학.저사연구,가위금후로면판적탈공검측급자진빈솔분석제공일정삼고.
These have good correlation between cavity degree of cement concrete pavement slab and its vibration characteristics. To accurately obtain the vertical vibration frequency of the concrete pavement slab, the time history of vibration and damped free vibration wave form of the pavement slab of different cavern area were acquired by ambient excitation and transient excitation, the nature frequency was obtained through principle of fourier transform and maximum entropy spectrum method. The result shows that the vertical natural frequency of the pavement slab should be acquired through comprehensive analysis of various methods in the field measurement. The vibration amplitude of pavement slab in case of transient excitation is higher than that in case of ambient excitation, the accurate and clear test results are easy to be obtained through frequency spectrum analysis in the maximum entropy spectrum method of the damped free vibration waveform of the pavement slab. These researches will provide certain reference for cavity detection and natural frequency analysis of pavement slab in the future.