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SOLAR MOUNTING STRUCTURE - SUPER STRUCTURE

 
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apumkivi
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Joined: 19 Nov 2013
Posts: 1

PostPosted: Thu Nov 28, 2013 5:01 pm    Post subject: SOLAR MOUNTING STRUCTURE - SUPER STRUCTURE Reply with quote

Dear Sefian,

Since 5 year renewable energy become hot cake for most of the new developer & Investor. But structural designer still fight with various clients to convinced them as we don't have a design code & Standard for solar.

I would like to highlight some issue which has been discussed but agreed in mutual understanding after no strong engineering conclusion

1. Deflection limit as per IS 800 2007 table 06
For Purlin (holding solar panel), Rafter (holding Purlin) & vertical Column post.

deflection limit - span/150 or span/180 or span/240?
2. IS 875 part 3, Table 07 mono slope,
Maximum tilt angle observed is 30 degree, where as in for tracking solar radiation solar mounting structure tilted till 45 degree  (seasonal).

so how wind pressure & pressure co-efficient shall be calculated. shall be extrapolate pressure coefficient after 30 degree or limit the stress ratio to 0.75 (in staad)
do we or international have method to be observed in design.

3. IS 875 part 3, Fig 1 Geographical map of wind speed
Fig 1 is based on category 2 and solar mounting structure comes under category 1 ( av. height less than 1.5 m as defined in IS 875 about length & height).

Shall we multiply co-efficient difference for  category 1 & class A

4. IS 875 factor K1= 1.0 or K1= 1.07
Max design life of solar PV is 25 year but code ask to considered any building or structure which is not defined in table 1 shall be design for 50 years
For thermal & gas K1= 1.08 is adopted




NOTE: WIND IS PRIMARY LOAD & LIFE OF SOLAR PV PLANT IS 25 YEARS
requesting expert to through light in design parameters to be considered for designing mounting structure.

I have attached a 150 MW SPV structure file her with, which will give idea about the structure to be used.


Regards



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bijay sarkar
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Joined: 14 Dec 2009
Posts: 314

PostPosted: Fri Nov 29, 2013 4:24 am    Post subject: Reply with quote

Dear Apumkivi,

The structural sketch as shown by you are constructed in several rows over the whole area depending on the capacity of the solar project and thus overall structure for such solar mounting structure as a whole may be considered as a Saw-Toothed Multispan Structure and i think you may consider the wind parameters from TABLE 17 for coefficients.


regards,

bijay sarkar
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gpsarathyy
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Joined: 28 Jun 2010
Posts: 481
Location: chennai

PostPosted: Sun Dec 01, 2013 6:32 pm    Post subject: Reply with quote

Deflection limit shall be fixed based on the Solar panel flexibility. IS 800 gives different values for deflection to consider the appropriate value for the brittle or flexible cladding
Similar to cladding here the solar panel flexibility governs the deflection limit/value.

_________________
G.PARTHASARATHY M.E. CEng(UK), MICE., MIE.,
CHENNAI
GPSARATHYY@GMAIL.COM
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homesolarindia
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SEFI Member


Joined: 10 Nov 2017
Posts: 1

PostPosted: Tue Nov 14, 2017 7:26 am    Post subject: Re: SOLAR MOUNTING STRUCTURE - SUPER STRUCTURE Reply with quote

apumkivi wrote:
Dear Sefian,

Since 5 year renewable energy become hot cake for most of the new developer & Investor. But structural designer still fight with various clients to convinced them as we don't have a design code & Standard for solar.

I would like to highlight some issue which has been discussed but agreed in mutual understanding after no strong engineering conclusion

1. Deflection limit as per IS 800 2007 table 06
For Purlin (holding solar panel), Rafter (holding Purlin) & vertical Column post.

deflection limit - span/150 or span/180 or span/240?
2. IS 875 part 3, Table 07 mono slope,
Maximum tilt angle observed is 30 degree, where as in for tracking solar radiation solar mounting structure tilted till 45 degree  (seasonal).

so how wind pressure & pressure co-efficient shall be calculated. shall be extrapolate pressure coefficient after 30 degree or limit the stress ratio to 0.75 (in staad)
do we or international have method to be observed in design.

3. IS 875 part 3, Fig 1 Geographical map of wind speed
Fig 1 is based on category 2 and solar mounting structure comes under category 1 ( av. height less than 1.5 m as defined in IS 875 about length & height).

Shall we multiply co-efficient difference for  category 1 & class A

4. IS 875 factor K1= 1.0 or K1= 1.07
Max design life of home solar PV is 25 year but code ask to considered any building or structure which is not defined in table 1 shall be design for 50 years
For thermal & gas K1= 1.08 is adopted




NOTE: WIND IS PRIMARY LOAD & LIFE OF SOLAR PV PLANT IS 25 YEARS
requesting expert to through light in design parameters to be considered for designing mounting structure.

I have attached a 150 MW SPV structure file her with, which will give idea about the structure to be used.


Regards



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