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vandana_bimal SEFI Regulars
Joined: 26 Jan 2003 Posts: 21
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Posted: Sun Jan 25, 2004 2:15 pm Post subject: Malay's question and answer |
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Dear Malay and Bina
regarding expansion joints in the lateral directions in a building, I may remind you that it is predominantly for temperature stresses. The temperature effects are always on the periphery of the building. Especially, the plan area gets heated up and expands. The same effect is not seen on the columns. Hence, the provision is there for expansion joints only in the plan dimensions and not in the vertical direction. One more point to be remembered is that we have a rcc slab element in plan which is directly affected by the heat. In the vertical direction, we do not have any such continuum structural element.
Bimal Shah M.S.U., Baroda
From: bina@ccsl.com.np Subject: Expansion Joints In Buildings. Date: 24/01/04 Time: 17:00:15 ---------------------------------------------------------- I guess its because there is no restrictions on expansion in the vertical direction whereas in the horizontal direction the support system does not allow the structure to deform thus introducing thermal stresses. ----------------------------------------------------------
---------------------------------------------------------- From: malay.kumar@total-environment.com Subject: Expansion Joints In Buildings. Date: 24/01/04 Time: 17:52:11 ---------------------------------------------------------- I was discussing this with one of my colleague ; I am quite convinced by his reply . Columns or vertical RCC members are subjected to heavy Axial loads (always) , which acts downwards , so there is no question of Columns expanding in Vertical direction. Whereas in Beams of Slabs it's not the case. In case of horizontal members the RCC components can expand or contract with rise ; fall in temperature. But still there are some minor dimensional changes due to potential impact of temperature , which can be overcome by appropriate design methods , as we do while designing Concrete Arch (supporting huge concentrated loads). In fact in Arch design this temperature effect caters for Major Moments. Correct me if I am wrong.
Regards Malay
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