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Re: Expansion Joints

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Vijay,

You must first understand the logic of an expansion joint before settling
down with its spacing.

Expansion joint is a movement (functional) joint which is installed to
accomodate volume change. The other members of this family of joints are:

    -  control (contraction) joints
    -  shrinkage strips.

According to MARK FINTEL the use of Expansion joints in a building is a
controversial issue. There is a great divergence of opinion concerning the
importance of expansion joints in concrete construction. Some experts
recommend joint spacings as low as 30 ft while others consider expansion
joints entirely unnecessary.

Joint spacings of roughly 100 to 200 ft for concrete structures seem to be
typical ranges recommended by various authorities. For steel structures a
spacing of 200 ft is normal.

However, the spacing is most of the times also dictated by the following
factors which determine the location of such joints:

   - new building adjoining existing building
   - long low building abutting higher building
   - wings adjoining main structure
   - long low connecting wings between buildings
   - intersections at wings of 'L', 'T', or 'U'
     shaped buildings.

For further readings I would recommend you the following reference:

    HAND BOOK OF CONCRETE ENGINEERING

          BY: MARK FINTEL
       VAN NOSTRAND REINHOLD CO.

Regards,

SYED FAIZ AHMAD; MENGG, MASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.


From: "Vijay K. Patil" <vjkpatil(--nospam--at)vsnl.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: SEAINT <seaint(--nospam--at)seaint.org>
Subject: Expansion Joints
Date: Wed, 27 Feb 2002 13:03:51 +0530


Dear Friends


In Indian codes a general crietria for provision of expansion joints in
Concrete buildings is given as 45m i.e. in case the length of the
building exceeds 45m an expansion joint should be provided unless the
temperature stresses are taken care of.

However in Steel design code specifies no expansion joints need to be
provided  for buildings upto 120 m with one central bracing bay and 180
m for buildings having braced bay 45m from both ends.

The gap between the buildings to be provided is atleast 30 mm.

What is the general design crietria for providing expansion/contraction
joints in your country code. And what should be the gap between the two
buildings.

Vijay Patil





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SYED FAIZ AHMAD; MENGG, MASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.


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