CAJ | 학술논문

为了研究连续梁桥冲击因数与其固有频率和振型的关系，分析计算了4等跨连续梁的固有频率和振型，并进行了4等跨连续梁振动试验；通过分析和试验，确定梁的前四阶振型最大曲率位置，结合规范讨论了计算冲击因数时结构固有频率的选取。结果表明：当计算4等跨连续梁桥的正弯矩效应时，冲击因数计算采用基频是合理的；当计算负弯矩效应时，不应采用基频，应采用第2阶频率。
위료연구련속량교충격인수여기고유빈솔화진형적관계，분석계산료4등과련속량적고유빈솔화진형，병진행료4등과련속량진동시험；통과분석화시험，학정량적전사계진형최대곡솔위치，결합규범토론료계산충격인수시결구고유빈솔적선취。결과표명：당계산4등과련속량교적정만구효응시，충격인수계산채용기빈시합리적；당계산부만구효응시，불응채용기빈，응채용제2계빈솔。
In order to study the relation between the impact factor of continuous beam and the natural frequencies and mode shapes ,the natural frequencies and mode shapes of four equal spans continuous beam are calculated ,and these dynamic parameters of 4 equal spans continuous beam modal are measured .From the analysis and modal test ,the locations of the maximum curvatures of the mode shapes are determined .The selection of the natural frequency of the beam is discussed with the design code .It is shown that ,for the impact factor ,when the effect of positive bending moment is calculated ,it is reasonable to use the fundamental frequency ,and the 2nd frequency must be used when the effect of negative bending moment is calculated .