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RE: Modulus of Elasticity for concrete

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No issue.  I was reviewing some papers being presented at this year's Canadian 
 Association for Earthquake Engineering conference in July and I noted various 
 values for Ec being presented by various submissions.

I was interested in what others were using for Ec and received a range of 
values ... (smile)

Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE, FEC
Victoria, BC
Email: vicpeng(--nospam--at)
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-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of nma Sent: June-07-15 2:17 PM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Modulus of Elasticity for concrete

In fact that is the same formula from Section 1102 of ACI 318-63.

So why is this an issue?

Neil Moore, PE, SE

neil moore and associates
consulting structural engineers
shingle springs, california
530 677-4308

On 6/7/2015 1:16 PM, Rizwan Mirza wrote:

> Following are the provisions of ACI 318-05 and ACI 318-05M:
> ACI 318-05
> 8.5.1 — Modulus of elasticity, Ec , for concrete shall be permitted to
> be taken as wc^ 1.5 x 33 (fc')^.5 (in psi) for values of wc between 90
> and 155 lb/ft^3. For normal weight concrete, Ec shall be permitted to

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