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Re: Time-dependent lateral pressure on formwork
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Time-dependent lateral pressure on formwork
- From: "Gu Jianzhong" <jz_gu(--nospam--at)263.net>
- Date: Tue, 30 May 2000 12:50:07 +0800 (CST)
I am glad to have the same idea with you. I am studying the effect of composite structure of steel and concrete. And the time-dependent pressure is important for the structure. The question has puzzled me for a long period. Could you kindly recommend me with some references? Even basic expriemental data or prelim reports are useful for me.
Accoring to a paper, lateral pressure on formwork will reduce to 1/4 of initial one. But it is written in Chinese and not detail enough to draw conclusion.
Graduate student of Civil Engineering Dept.
B9810091,Shanghai Jiao Tong Uinversity
>If the concrete has hardened enough to remove the lateral pressure how do you avoid a cold joint, on a repeat pass, without serious vibration of the "set" surface, interfering with that set, and re-introducing lateral pressures? How about designing for the full height and then run the pour, full height, with a running "active" face along the length of the wall. I am always uncomfortable with repeat passes especially if I have no control on the length of time between passes.
>If the wall is so high that repeat passes are necessary, shouldn't there be allowance for a proper construction joint between lifts?
>Thor A Tandy P.Eng, MCSCE