多振源激励下站房结构振动响应分析方法  

ANALYSIS METHOD FOR VIBRATORY RESPONSES OF STATION STRUCTURES UNDER MULTIPLE EXCITATION SOURCES

作　　者：丁阳[1] 米仓[1] 

机构地区：[1]天津大学建筑工程学院/滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《工程力学》2013年第2期163-168,共6页Engineering Mechanics

基　　金：国家自然科学基金面上项目(50978181)

摘　　要：立体式、现代化铁路站房结构处于列车行驶、人行及设备运行等多振源共同激励的复杂振动条件下,目前国内外尚无合理的多振源激励下站房结构振动响应分析方法。通过分析列车行驶、人行及设备运行单独激励下站房结构振动响应的时频域特性和频带交叠情况,提出了基于均方根加速度、考虑加权功率相干叠加的多振源激励下站房结构振动响应分析方法,并对方法的合理性和适用性进行了论证。以天津西站站房结构为例,分别采用非相干叠加方法和加权功率相干叠加方法对站房结构进行三振源激励下振动响应分析。结果表明,考虑加权功率相干叠加的振动响应均方根加速度区间可以包络三振源激励下非相干叠加的站房结构振动响应均方根加速度值。The station structures comprising of several structural layers suffer multiple excitations such as train moving, human walking and equipment operating, but a reasonable analysis method for vibration responses of station structures under multiple excitation sources has not been proposed. In this paper, the response of station structures under each excitation was analyzed in both time and frequency domains and superposed by the weighted power coherent superposition method which is based on Root Mean Square considering the frequency overlap among the structural responses under each excitation, and the rationality and applicability of the weighted power coherent superposition method was also demonstrated. A numerical example of Tianjin West Station under three excitation sources including train moving, human walking and equipment operating was analyzed by both the proposed method and simple sum method. The results indicate that the Root Mean Square interval of structural responses calculated by the proposed method could envelope the result of simple sum method.

关 键 词：站房结构 多振源 列车行驶激励 人行激励 设备运行激励 功率叠加 

分 类 号：O327[理学—一般力学与力学基础]