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undeformed bars
a 1920 slab with undeformed bars, can i get help on what reduction should i put into consideration for having undeformed bars instead of deformed bars !
check out our whitepaper library.
crsi has a article "evaluation of reinforcing bars in old reinforced concrete structures". check crsi.org
structual grade fy = 33,000 psi (unless otherwise specified)
14,000 allowable
assume 50% as effective in bond and anchorage as current bars.
another helpful quote.
"since most strength design reviews for flexure will be based on yield strength, fy = 33,000 psi instead of today's 60,000 psi, the tension development lengths for the old bars can be determined by adding 10% to any current table of tension development lengths, ld for modern reinforcing bars."
thanks ironmon.....
that is what i was looking for

2009-09-16, 05:04 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	undeformed bars undeformed bars a 1920 slab with undeformed bars, can i get help on what reduction should i put into consideration for having undeformed bars instead of deformed bars ! check out our whitepaper library. crsi has a article "evaluation of reinforcing bars in old reinforced concrete structures". check crsi.org structual grade fy = 33,000 psi (unless otherwise specified) 14,000 allowable assume 50% as effective in bond and anchorage as current bars. another helpful quote. "since most strength design reviews for flexure will be based on yield strength, fy = 33,000 psi instead of today's 60,000 psi, the tension development lengths for the old bars can be determined by adding 10% to any current table of tension development lengths, ld for modern reinforcing bars." thanks ironmon..... that is what i was looking for __________________ 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]