孙振，邹力强，施从伟
    (上海建筑设计研究院有限公司，上海200041)

[摘要] 本文根据某商业工程实例，介绍了有偏心集中荷载的建筑物钢结构大跨连接天桥的设计中需要考虑和分析的关键问题——行走舒适度。分别从造型、舒适度、经济性等方面出发，合理分析计算，着重分析了一种经济有效的措施，不增加主结构杆件截面，提高这类天桥结构刚度来满足舒适度的设计要求。
[关键词] 钢桁架大跨天桥；共振；固有频率；只受拉单元

Analysis of the comfortability in designing the Long-span steel truss connective bridge withstanding eccentric concentrated loads
Sun Zhen, Zou Liqiang, Shi Congwei
(Shanghai lnstitute of Architectural Design & Research Co., Ltd., Shanghai 200041,China)

Abstract: This article, based on an example of a commercial building project, introduces comfortability which is the key factor of designing the Long-span steel truss cormective bridge withstanding eccentric concentrated loads that needs considering and analyzing. It makes logical analyses from the aspects of the appearance, comfortability and economy respectively, emphasizes the analysis of an economical and efficient measure, which can meet the comfortability requirement through increasing the stiffness of this kind of structure but not enlarge the sections of the main structural members.
Keywords: long-span steel truss bridge; resonance; natural frequency; unit only bearing pull