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[chiragchaudhari]

Dear sir/ Madam,

As per section 5.4.1 the lateral drift ratio (under factored wind load combinations) is given as H/500 and for single story it is given as h/400. For earthquake load (factored) combinations it is given as h/250.
H=total ht of the building
h=ht of one story


My question is for which unfactored wind load combinations and factored earthquake load combinations the drift value is to be considered.�


Also does H/500 states the limitation for maximum deflection of building as tatal height is considered.�


Kindly give some clarity on this clause....


Regards,
Chirag Chaudhari.

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[alpa_sheth]

The use of factored/unfactored needs to be understood.�


Unfactored wind� loads are easy to understand. They are the design wind loads without any load combination factors of 1.5, 1.2 etc.�
Factored� earthquake loads are also the design earthquake loads without any load combination factors of 1.5, 1.2 etc. The reason they are called "factored" loads is because you have used a response reduction factor R to factor down the earthquake force levels.


regards,
A








best regards,Alpa Sheth�




VMS Consultants Pvt. Ltd.
83 Sakhar Bhavan
230 Nariman Pt.�
Mumbai 400021
Tel: 91-22-61725200
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结婚,3月14日,2018年在9:06,chiragchaudhari forum@www.buonovino.com)> wrote:

[hemalmistry]

Alpa mam, Thanx for the clarification regarding "factored seismic load", as generally we mean factored load combinations are load combinations with PSF for loads applied to each load.

Regards
hemal

[chiragchaudhari]

Thank you for making it more clear.

I have one more query.
The same clause suggest the relaxation of drift limitation to h/400 for single story.
What exactly it is for..??


Regards,
Chirag Chaudhari


On Wed, Mar 14, 2018, 11:03 alpa_sheth forum@www.buonovino.com)> wrote:

[quote]​The use of factored/unfactored needs to be understood.�


Unfactored wind� loads are easy to understand. They are the design wind loads without any load combination factors of 1.5, 1.2 etc.�
Factored� earthquake loads are also the design earthquake loads without any load combination factors of 1.5, 1.2 etc. The reason they are called "factored" loads is because you have used a response reduction factor R to factor down the earthquake force levels.


regards,
A






​

best regards,Alpa Sheth�


]https://drive.google.com/uc?id=0B4BXntATUzLzTWdET1NuSmJtUTA&export=download">

VMS Consultants Pvt. Ltd.
83 Sakhar Bhavan
230 Nariman Pt.�
Mumbai 400021
Tel: 91-22-61725200
w (vmsb@vakilmehtasheth.com (vmsb@vakilmehtasheth.com))ww.vakilmehtasheth.com










On Wed, Mar 14, 2018 at 9:06 AM, chiragchaudhariforum@www.buonovino.com (forum@www.buonovino.com))> wrote:
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