几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量  


返回   几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量 » 三维空间:产品设计或CAX软件使用 » CAD设计 » 产品功能分析
用户名
密码
注册 帮助 会员 日历 银行 搜索 今日新帖 标记论坛为已读


回复
 
主题工具 搜索本主题 显示模式
旧 2009-09-07, 10:52 AM   #1
huangyhg
超级版主
 
huangyhg的头像
 
注册日期: 04-03
帖子: 18592
精华: 36
现金: 249466 标准币
资产: 1080358888 标准币
huangyhg 向着好的方向发展
默认 allowable bending stress = fy

allowable bending stress = fy'
i recently reviewed a simple-support steel beam design performed by an outside consultant. the consultant used asd. allowable stress he used to check a hp 10x42 was fy' = 29.4ksi. why would this have been done?
i have never seen yet in practice or in books of fy' (value of when flanges become non-compact) be used as the allowable stress.
can someone possibly elaborate on maybe why this was done. i don't have the opportunity to contact the consultant, hence why i'm asking here.
check out our whitepaper library.
if the calculations follow the typical design method and the only difference is fy' is it an issue?
rc
all that is necessary for the triumph of evil is that good men do nothing.
edmund burke

was he using 50 ksi steel? was it laterally braced??
did he actually specify that he was using fy'? or did he use a stress that just happened to be that number?
i need to clarify a couple things.
the beam was an hp 10x42. aisc 9th edition lists fy' as 29.4 ksi. the steel was a36 steel.
he actually substituted fy' = 29.4ksi for fy and made the allowable stress = 0.66(29.4ksi).
the beam i believe was not laterally braced in any appreciable way.
something to do with the hp being non-compact?
if i re
i suppose the idea is that if the yield stress was 29.4 ksi, then the
suggest that you ask the engineer if the hp is "used". lowering fy' may be his way addressing the possibility that the
__________________
借用达朗贝尔的名言:前进吧,你会得到信心!
[url="http://www.dimcax.com"]几何尺寸与公差标准[/url]
huangyhg离线中   回复时引用此帖
GDT自动化论坛(仅游客可见)
回复


主题工具 搜索本主题
搜索本主题:

高级搜索
显示模式

发帖规则
不可以发表新主题
不可以回复主题
不可以上传附件
不可以编辑您的帖子

vB 代码开启
[IMG]代码开启
HTML代码关闭

相似的主题
主题 主题发起者 论坛 回复 最后发表
aisc allowable stress-gaylords se hdbk huangyhg 产品功能分析 0 2009-09-07 10:33 AM
aisc 9th edition vs. 13th edition huangyhg 产品功能分析 0 2009-09-07 10:33 AM
aci 530 and unity equation huangyhg 产品功能分析 0 2009-09-07 09:52 AM
316 ss allowable stress huangyhg 产品功能分析 0 2009-09-07 08:40 AM
2 diameter hole stress raiser question huangyhg 产品功能分析 0 2009-09-06 10:51 PM


所有的时间均为北京时间。 现在的时间是 09:20 PM.


于2004年创办,几何尺寸与公差论坛"致力于产品几何量公差标准GD&T | GPS研究/CAD设计/CAM加工/CMM测量"。免责声明:论坛严禁发布色情反动言论及有关违反国家法律法规内容!情节严重者提供其IP,并配合相关部门进行严厉查处,若內容有涉及侵权,请立即联系我们QQ:44671734。注:此论坛须管理员验证方可发帖。
沪ICP备06057009号-2
更多