协同式空腹夹层板动力特性分析及舒适度研究

The dynamic property and comfort degree study on the steel-concrete composite vierendeel sandwich plate

为了解贵州省博物馆新馆协同式空腹夹层板的动力特性及人行舒适度性能,采用有限元法计算楼盖结构模态及加速度响应,并进行现场实测。还推导了基频的简化计算公式。其中有限元分析时,考虑了不同边界条件、不同单元类型等因素对分析结果的影响。分析结果表明:楼盖自振频率及加速度峰值计算值、实测值均满足规范。实体-壳单元模型、双层梁-壳单元模型均能较为准确反映协同式空腹夹层板动力特性,不同频率下定点激励及行走路线激励下的楼盖加速度峰值满足规范要求,基频简化计算方法能够满足工程精度要求。

The paper takes the new museum of Guizhou Province as a prototype. It uses t-section steel-concrete composite open-web sandwich plates. Under various boundary conditions, the frequency and mode shape of three types of finite element models have been calculated out by using the subspace iteration method. The acceleration of the floor is obtained under the circumstance of continuous walk and various walking frequencies should be taken into consideration on this occasion. The dynamic characteristics of the floor is tested under the condition of environmen- tal incentive and continuous walk. Frequency-domain method has been adopted to get modal parameters and thus we get each order natural frequency, mode shape, damping the further and acceleration. The equation of funda- mental frequency of lattice girder can be calculated out through the equation. Following result can be drawn through this study： First, the solid-shell model and the two layer beam-shell element model can accurately show the dynam- ic characteristics of open-web sandwich plates. Second, the results of the simplified calculation of the fundamental frequency of the open-web sandwich is equal to that of the two layer beam-shell element. Third, the maximum ac- celeration under the condiiion of walk continuous walk can meet the standards.