木结构建筑楼盖结构模态试验及其有限元分析

研究了木结构建筑楼盖结构振动特性与建筑舒适度耦合性能,对其开展有限元振动模型计算、模态试验及振型和舒适度分析。结果表明:楼盖结构基频模拟值、单向模态试验值和双向模态试验值均满足楼盖结构不小于15.623Hz设计要求;楼盖结构经有限元模拟计算的前三阶固有频率中,其基频振型为长度、宽度方向的弯曲振型,第二阶为长度方向的弯曲振型,第三阶为宽度方向的弯曲振型;楼盖结构的双向模态试验的基频呈x向的一阶弯曲振形;二阶固有频率呈x向的二阶弯曲振形。

Modal Test and Finite Element Model of Floor of Wooden Building

The coupling characteristics of vibration characteristics and building comfort of wood structure building floor structures were studied. The finite element vibration model calculation, modal test and vibration mode and comfort analysis were carried out. The results showed that the simulated basic frequency value, unidirectional modal test value and the bidirectional modal test values were greater than15.623 Hz, which was required by design, and was consistent with the standard of the comfort of buildings. In the finite element modelling of floor, the fundamental frequency vibration mode was the bending mode of the length and width directions, and the second order was the bending mode of the length direction, the third order were the bending modes of the width direction;The bidirectional mode test of the floor structure had a fundamental frequency, which was a first-order bending mode in the x direction;the second-order natural frequency value was a second-order bending mode in the x direction.