HomeMy WebLinkAbout112 11th St - CofOCity of Huntington Beach
Department's of Building & Planning
APPROVED-i- v 77 28�
For Disciplines Signed Below •
Signed at el
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Structural/Arch. • • • • • •
Planning 4-�=-� ... •
Electrical —
Plumbing BURNETT ANV BURNET-ft ; ;•.
Mechanical
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B.P. PS2®ol- 10 '1 Z8�1 Type �s Vegas Area-310 775 5'�F3• • • • • • • •
Group Occ. Load CBC Ed -�.a? 88 Sedona Sunrise Drive, Las Vegas, NV 89128
Miscellaneous ^WINE SM;P-09 r1 1130 Pine Street, Lynwood, CA 90262
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September 14, 2010
City of Huntington Beach
Building and Safety Department
Subject: Resolution of Gary Pope Residence Wind Screen Design Issue
Mr. Gary Pope of 112 11th Street, Huntington Beach, CA 92648 requested I review the design and
engineering fora wind screen surrounding an outdoor deck at the front of his residential property.
I understand the wind screen was designed and PE stamped by a structural engineer and then permitted
and built nine years ago. The 2001 engineering drawings called for a 42.0 "total height (including top -
bottom 2/4 rails) See sketch below. Before the wind screen was built the owner received approval and
onsite review by the inspector for a 48.0" total height wind screen, the change from 42.0 inches to 48.0
inches was based on the clear view of the plexi-glass noted within a separate alley/sidewalk failure
analysis. The 48.0" height was built and has remained in place without structural or weather damage
for over 9 years.
We understand the city wants the owner to change back to 42.0" height and the owner has agreed to
accept this decision. The city has requested the owner to also review the screen design at the reduced
height of 42.0" using 2001 structural values. Reducing the wall height by 6" to 42' reduces the lateral
loads and moment as well as dead loads on the screen support system and anchors by 15%.
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The support system consists of 4 X 4 posts with 2" X 4" top and bottom rails each slotted 0.5Q0" deep
for insertion of 0.250" Plexiglas. There are eight screen sections, tho:igngejt � 40:' x70. iris hos.:
Simpson strong tie 4 X4 post supports with two 1/2"cross bolts were ust&to Mch(j t�oimps •.'
strong tie on top of the concrete wall.
Each Simpson/post support is held in place with one each stainless: 7/16 stai:iltss 11661 tHreaJ64 rld
and one s/s 5/16" threaded rod. The 7/16" threaded rod is in the concrete 4.b%4egp,gPd • . •
epoxy/anchored in place in the middle of the Simpson flange. The second 5/16 bolt is epoxy 3.50"
deep into the concrete on the outside of the flat portion of the flange. Note the photos on the following
page.
4 x 4 Post Mounting
Railing Fastening Gusset Plate with Anchor Bolts
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Simpson 4 x 4 bracket
Top Rail Gusset Plate Attachment with #10 Wood Screws
The modification to the wind screen to lower 6" was accomplished by sliding the top and bottom rails
and plexi-glass down using the slots from 48.0" to 42.0". The plexi-glass slides down the slots and
repositions the top and bottom 2" X 4" rails, so there were no structural changes to the original PE
stamped design while the loads were reduced by 15%. In addition, the owner installed the additional
5116' bolt in the wall just to add additional strength to the 4X4 bracket/plate.
SUMMARY RECOMMENDATION•
It is my considered opinion that the structural design and anchor system for the wind screen is in full
compliance with the original PE stamped and permitted project. The wind screen loads were reduced
by 15% based on the reduction in wind screen height and dead loads. Additional safety was provided
by lowering the screen to 42", adding the 5/16 threaded rod to the anchor plate and the stainless steel
gusset plates for the top and bottom rails.
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The 48" high wind screen has existed in place for 9 years with no damage or deterioratigq and the 42"
wind screen should continue that operating performance. The wind scrccn s p�grt� tetra a Banc oY
wood and stainless steel components appear to be in good conditions a&v&ll as the., DpIf% nd 3d e.,A%
used in the installation. The design and installation at 42" meets code and industry standards.
Herbert F. Burnett, P.E., CA RCE 22320 �D-l�� S ►aw��
President, Burnett and Burnette A ,
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