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round concrete column
is there a limitation on the spacing of the vertical reinforcing around the perimeter of a round concrete column. with round ties, is it to be limited to 6" per aci 318? or do round ties let me go further than 6"?
i think you can go further than 6", but you have to have at least 8 bars (aci 10.9.2)and you have to meet the 1% minimum. in 7.10.5.3 - the last sentence appears to imply that if you use circular ties, the 6" space limit doesn't apply.
try the link below-
actually aci 10.9.2 requires only 4 bars minimum for square or circular ties, and 6 bars minimum for spirals.
aside from meeting the 1% min and 8% max steel area i don't think the vertical bar spacing matters for circular ties.
i think what jae was implying is when 8 bars or more are provided you do not have to consider the bar placement when considering its moment strength.

2009-09-15, 07:37 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	round concrete column round concrete column is there a limitation on the spacing of the vertical reinforcing around the perimeter of a round concrete column. with round ties, is it to be limited to 6" per aci 318? or do round ties let me go further than 6"? i think you can go further than 6", but you have to have at least 8 bars (aci 10.9.2)and you have to meet the 1% minimum. in 7.10.5.3 - the last sentence appears to imply that if you use circular ties, the 6" space limit doesn't apply. try the link below- actually aci 10.9.2 requires only 4 bars minimum for square or circular ties, and 6 bars minimum for spirals. aside from meeting the 1% min and 8% max steel area i don't think the vertical bar spacing matters for circular ties. i think what jae was implying is when 8 bars or more are provided you do not have to consider the bar placement when considering its moment strength. __________________ 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]