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 - 查看单个帖子 - vertical distribution of seismic forces asce 7-05

vertical distribution of seismic forces asce 7-05
hello;
i have been trying to find out about the "k" factor in the cvx formula (12.8-12). the asce 7-05 states that it is an exponent related to the structure period. but i still do not know where it comes from, is it a factor that relates to the system's ductility?
please let me know if you have some info on this. thank you.
j.l.p.q
i believe that it is a factor that corresponds to the overall period of the structure in that a more flexible (palm tree) structure will behave in a different fashion than a less flexible (oak tree) system.
with the flexible system, under a particular seismic event, the response of the structure could be visualized more as a whipping motion where lateral forces would be more significant in the higher stories.
so, the k factor accentuates the effect of the height of the structure with larger values of k for longer period structures.
this simply places more of the "applied" forces higher in the structure.
as to where it comes from - i would think it simply is the result of analysis studies or tests. the commentary doesn't even deal with it.

2009-09-16, 06:19 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	vertical distribution of seismic forces asce 7-05 vertical distribution of seismic forces asce 7-05 hello; i have been trying to find out about the "k" factor in the cvx formula (12.8-12). the asce 7-05 states that it is an exponent related to the structure period. but i still do not know where it comes from, is it a factor that relates to the system's ductility? please let me know if you have some info on this. thank you. j.l.p.q i believe that it is a factor that corresponds to the overall period of the structure in that a more flexible (palm tree) structure will behave in a different fashion than a less flexible (oak tree) system. with the flexible system, under a particular seismic event, the response of the structure could be visualized more as a whipping motion where lateral forces would be more significant in the higher stories. so, the k factor accentuates the effect of the height of the structure with larger values of k for longer period structures. this simply places more of the "applied" forces higher in the structure. as to where it comes from - i would think it simply is the result of analysis studies or tests. the commentary doesn't even deal with it. __________________ 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]