2.2 Live load on floor and roof 1.Live load on floor of residential building民用建筑楼面活荷载 Reduction on nominal value: When the room is large,the uniformly distributed load is less possible to be imposed on all the area of room with the magnitude of nominal value. Therefore,the variation of actual load distribution should be considered in design of beam,wall,column and foundation.Accordingly,reduction should be conducted on nominal values. 归东理子大军 SHANDONG UNIVERSITY OF TECHNOLOGY
2.2 Live load on floor and roof 1. Live load on floor of residential building民用建筑楼面活荷载 ▫ Reduction on nominal value: When the room is large, the uniformly distributed load is less possible to be imposed on all the area of room with the magnitude of nominal value. Therefore, the variation of actual load distribution should be considered in design of beam, wall, column and foundation. Accordingly, reduction should be conducted on nominal values
2.2 Live load on floor and roof 1.Live load on floor of residential building民用建筑楼面活荷载 Reduction on nominal value: The most widely used reduction methods are semi-empirical. ·International practice国际通行做法 ·Calculation of live load on beam计算梁的楼面活荷载效应 Forresidential building and offices:+8 For public facility and therooms:=0.58m where A is tributary area of beam梁的从属面积 的东理王大军 SHANDONG UNIVERSITY OF TECHNOLOGY
2.2 Live load on floor and roof 1. Live load on floor of residential building民用建筑楼面活荷载 ▫ Reduction on nominal value: The most widely used reduction methods are semi-empirical. International practice 国际通行做法 Calculation of live load on beam 计算梁的楼面活荷载效应 For residential building and offices: 𝜆𝜆 = 0.3 + 3 𝐴𝐴 , 𝐴𝐴 > 18𝑚𝑚2 For public facility and the rooms: 𝜆𝜆 = 0.5 + 3 𝐴𝐴 , 𝐴𝐴 > 18𝑚𝑚2 where A is tributary area of beam 梁的从属面积
2.2 Live load on floor and roof 1.Live load on floor of residential building民用建筑楼面活荷载 Reduction on nominal value: The most widely used reduction methods are semi-empirical. ·International practice国际通行做法 ·Calculation of live load on column,wall or foundation of multi-story building计算多层房 屋的柱、墙或基础的楼面活荷载效应 For residential buildingfce:+ For public facility and the rooms:m where n is number of stories above calculating cross-section所计算截 面以上楼层数 归东罪子大军 SHANDONG UNIVERSITY OF TECHNOLOGY
2.2 Live load on floor and roof 1. Live load on floor of residential building民用建筑楼面活荷载 ▫ Reduction on nominal value: The most widely used reduction methods are semi-empirical. International practice 国际通行做法 Calculation of live load on column, wall or foundation of multi-story building 计算多层房 屋的柱、墙或基础的楼面活荷载效应 For residential building and offices: 𝜆𝜆 = 0.3 + 0.6 𝑛𝑛 , 𝐴𝐴 > 18𝑚𝑚2 For public facility and the rooms: 𝜆𝜆 = 0.5 + 0.6 𝑛𝑛 , 𝐴𝐴 > 18𝑚𝑚2 where n is number of stories above calculating cross-section 所计算截 面以上楼层数
2.2 Live load on floor and roof 1.Live load on floor of residential building民用建筑楼面活荷载 Reduction on nominal value: The most widely used reduction methods are semi-empirical. ·Code《建筑结构荷载规范》GB50009-2012 1设计楼面梁时： 1)第1(1)项当楼面梁从属面积超过25m2时，应 取0.9； 2)第1(2)~7项当楼面梁从属面积超过50m2时，应 取0.9； 3)第8项对单向板楼盖的次梁和槽形板的纵肋应取0.8， 对单向板楼盖的主梁应取0.6，对双向板楼盖的梁应 取0.8； 4)第9~13项应采用与所属房屋类别相同的折减系数。 的东理王大军 SHANDONG UNIVERSITY OF TECHNOLOGY
2.2 Live load on floor and roof 1. Live load on floor of residential building民用建筑楼面活荷载 ▫ Reduction on nominal value: The most widely used reduction methods are semi-empirical. Code 《建筑结构荷载规范》GB50009-2012
2.2 Live load on floor and roof 1.Live load on floor of residential building民用建筑楼面活荷载 Reduction on nominal value: The most widely used reduction methods are semi-empirical. ·Code《建筑结构荷载规范》GB50009-2012 2设计墙、柱和基础时： 1)第1(1)项应按表5.1.2规定采用； 2)第1(2)~7项应采用与其楼面梁相同的折减系数； 3)第8项的客车，对单向板楼盖应取0.5，对双向板楼 盖和无梁楼盖应取0.8； 4)第9~13项应采用与所属房屋类别相同的折减系数。 注：楼面梁的从属面积应按梁两侧各延伸二分之一梁间距的范围内的 归东理子大军 实际面积确定。 SHANDONG UNIVERSITY OF TECHNOLOGY
2.2 Live load on floor and roof 1. Live load on floor of residential building民用建筑楼面活荷载 ▫ Reduction on nominal value: The most widely used reduction methods are semi-empirical. Code 《建筑结构荷载规范》GB50009-2012