地下车库顶板消防车活荷载的合理取值研究  

Research on reasonable value of live load for fire engine on all buried underground garage roof

作　　者：戴冠民 田堃 

机构地区：[1]中国海诚工程科技股份有限公司,上海200031

出　　处：《建筑结构》2013年第1期44-47,共4页Building Structure

摘　　要：根据消防车活荷载的作用特征分析指出,该项活荷载应取荷载的偶然组合参与结构构件的承载能力极限状态验算;应取荷载的频遇组合参与结构构件的正常使用极限状态验算。以常用的柱网尺寸为8.4m×8.4m的全埋式地下车库为例,讨论了地下室顶板分别采用单向板、双向板和无梁楼盖方案时消防车轮压的最不利布置方式。并采用SAP2000有限元软件中的薄板单元模型分析推导出相应的消防车活荷载的等效均布荷载值。与规范将消防车活荷载视为一般活荷载而提供的建议值相比,本文提供的意见无论在荷载组合概念上,还是在消防车等效均布荷载取值上更显科学合理,且其在工程上的应用具有较大的经济效益与社会效益。By the acting characteristic analysis of fire engine＇s live load effect,it is indicated that fire engine＇s live load effect should combined in accidental combination for ultimate limit status computation,or combined in frequent combination for serviceability limit status computation.The worst disposals of fire engine tire acting on the roof was discussed when the roof structure is one-way slab,two-way slab or non-beam slab for the example of the common column span 8.4m×8.4m of all buried underground garage.The equivalent uniform fire engine＇s live load value was given by finite element software SAP2000 using thin-plate element.The recommendation is more reasonable and has better economic and social benefits whether considering the concept of load combination or comparing with the fire engine load recommended by the code which considering fire engine＇s live load as general live load.

关 键 词：作用特征 偶然组合 频遇组合 消防车活荷载 

分 类 号：TU312.1[建筑科学—结构工程]