(1 兰州大学西部灾害与环境力学教育部重点实验室， 兰州 730000； 2 兰州大学土木工程与力学学院， 兰州 730000；  3 重庆大学土木工程学院， 重庆 400044)

［摘要］介绍了国内外振动舒适度评价标准及评价指标，结合大跨度楼盖振动舒适度问题，指出预应力混凝土刚架索梁楼盖体系竖向振动频率不小于3Hz，作为办公室在落足激励下竖向峰值加速度不大于0-5%g。通过SAP2000建立了预应力混凝土刚架索梁楼盖体系“杆单元-壳单元”三维计算模型，对该楼盖振动舒适度进行了评价。该计算模型以Murray建立的落足模型为基础，考虑了测试人员的实际体重，通过时程分析方法得到预应力混凝土刚架索梁楼盖体系在落足激励下的峰值加速度时程响应，并在此基础上得到楼盖竖向振动基本频率，计算所得峰值加速度和基本频率与试验结果吻合良好。

［关键词］大跨度； 预应力混凝土刚架索梁； 楼盖；  振动；  加速度时程

中图分类号：TU378-8文献标识码：A文章编号：1002-848X(2016)15-0001-04

Study on vibration serviceability of  pre-stressed cable RC truss floor system

Zhou Xuhong1, 2, 3， Li Jiang1, 2， Liu Jiepeng3， Cao Liang3

(1 Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education of China, Lanzhou University,  Lanzhou 730000, China； 2 School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China； 3 School of Civil Engineering, Chongqing University， Chongqing 400044, China)

Abstract:The vibration serviceability evaluation standards and evaluation indexes in literatures from home and abroad were introduced. Combined with large-span floor vibration serviceability problem, it  was suggested that the vertical vibration frequency of pre-stressed cable RC truss floor system should not be less than 3Hz, and the vertical peak acceleration of an office should not be more than 0-5%g under the footfall excitation. By using SAP2000, three-dimensional calculation model of “beam-shell element” was established for the pre-stressed cable RC truss floor system, and the floor vibration serviceability was evaluated. The calculation model was based on Murray footfall model and took into account the actual weight of test personnel. Peak acceleration time history response of the pre-stressed cable RC truss floor system under the footfall excitation was obtained by the time history analysis method. There is a good agreement between the results of  the fundamental frequency and peak acceleration  from tests and time history analysis method.

Keywords:large-span; pre-stressed cable RC truss; floor; vibration; acceleration time history

*国家自然科学基金资助项目（51378244）。

通讯作者：李江，博士研究生，Email：lijiangest@126.com。