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[hemalmistry]

条款7.3.14需要模型多个塔智慧h single podium separately and integrally (fig 1B). Do we also need to model single tower with podium (fig. 1A) separately and integrally? Clause 8.1.3 applies to both fig 1A and 1B but modelling requirement is mentioned in cl. 7.3.14 and in cl. 8.1.3.3.3 (a) for fig. 1A only.

[ahujavipul]

I think this issue has been answered by the moderators.

Though a bigger question still lingers. In a combined tower model what empirical time period should be taken & base and what should be the procedure for scaling.

我建议为目的的隔膜calculation, a static equivalent load be applied in opposite directions (or in various permutations) & then the stresses studied. The natural time period will only produce minimal response.

Regards

Vipul Ahuja

[hemalmistry]

Dear vipul sir,

Clause 8.1.3.3.3 (c) (2) says "equivalent static seismic forces can be used, provided they are scaled to match base overturning moments obtained from response spectrum analysis".

Above clause need explanation as it required to do reverse of what we are doing for individual tower model. Does this clause requires to use response spectrum method only as impirical time period for multitower model to be used for static method is not available ? And so if static method is to be used its base overturning moment (why not base shear) is to be matched with that of response spectrum method.

Also, clause 8.1.3.3.3 (c) (1) needs explation. How load combinations as required by this clause can be generated?

Regards
Hemal

[ahujavipul]

I agree, the basis for matching overturning moment rather than base shear is unclear, when the stretching force in the ground floor diaphragm (between--say two towers) is less dependent on overturning & more on the base shear of the two acting in opposite directions.

Regards

Vipul Ahuja