HomeMy WebLinkAboutRS_City_of_Renton_Structural_Review_1_Letter_181126_v2November 4, 2018
Mr. Russ Sorkness
JK Monarch
424 29th St NE, Suite C
Puyallup, WA 98372
RE: Building Permit Structural Plan Review – First Submittal
862 Chelan Ave NE (B18005659)
Dear Mr. Sorkness:
We reviewed the proposed project for compliance with the structural provisions of
the 2015 International Residential Code (IRC) and 2015 International Building Code
(IBC) as amended and adopted by the state of Washington and the City of Renton.
The design team should address the comments below.
Responses to these review comments should be made in an itemized letter form and
any changes to the drawings should be clouded. We recommend that the permit
applicant have the structural engineer respond and resubmit for additional review.
All information should be submitted directly to the City of Renton.
Geotechnical
1. Geotechnical special inspections. Special inspections and tests should be
provided by a qualified geotechnical engineer as recommended in the
geotechnical report by Associated Earth Sciences dated June 20, 2013. See IRC
Section R401.4. The following is a summary:
a. Site excavation and grading.
b. Overexcavation for placement of structural fill.
c. Construction dewatering, see Page 4 of geotechnical report.
d. Placement of structural fill and soil compaction.
e. Verification of soil-bearing capacity.
REVISION
Received: 11/26/2018 / aalexander
BUILDING DIVISION
Mr. Sorkness
Page 2 of 3
November 4, 2018
No response from the applicant is required for this comment. This
comment is for the building official and for reference
Structural
General
1. Structural special inspections. Structural special inspections. Special
inspections by qualified special inspectors do not appear warranted for this
project. If it is determined otherwise, the applicable special inspections are
noted below. See IBC Sections 1704.1 and 1704.2.
a. Installation of concrete expansion, adhesive, and screw anchors, where
applicable: in accordance with qualifying report of evaluation service (e.g.,
ICC-ES). See also IRC Section 301.1.3 as well as IBC Section 1705.1.1.
No response from the applicant is required for this comment. This
comment is for the building official and for reference.
2. The drawings, such as Sheet S-0, should be revised to indicate the
manufacturer’s installation instructions shall be available on the job site at the
time of inspection, for the inspector’s use and reference. We strongly suspect
this requirement is indicated the drawings, we just cannot find it. The revised
drawings shall be resubmitted for reviews. See IRC Sections 106.1.1 and
106.1.2.
Lateral
3. The rear exterior shear walls on the Upper Level of the proposed structure
appear (as shown on the plans and calculations) to cause this framing scheme
to be irregular by IRC Section R301.2.2.2.5 Items 1 through 5, especially Items 1
and 3. Per IRC Section R301.2.2.2.5, these shear walls and supporting
elements shall be designed per acceptable engineering practice, i.e. the IBC
and associated ASCE 7-10. These shear walls appear to cause a Type 4
horizontal, and so the supporting members shall be designed for increase
forces, including increase in: chord forces, diaphragm connection forces to
chords and collectors, etc…; as indicted by ASCE 7-10 Tables 12.3-1 and 12.3-2
as well as Sections 12.3.3.3 and 12.3.3.4. Below is an image of the current
framing with redlines as the upper floor, the green lines as the main floor, and
the yellow lines as our comment. The submitted calculations do not appear to
Mr. Sorkness
Page 3 of 3
November 4, 2018
address these irregularities. Please submit substantiating data, such as
additional calculations, that indicate the proposed structure has the design
capacity to resist the required IBC loadings. Please note, there is currently no
collector in the Upper Floor framing to drag W2 shear loads to the Main Floor
shear walls. The drawings may need to be revised to also show a complete
load path from these shear walls to the foundation as per IRC Sections 301.1
and 301.1.3. Also see IBC Sections 1604.2, 1604.4, 1605.2, 1605.3, and 1613.1.
Corrections and comments made during the review process do not relieve the permit
applicant or the designers from compliance with code requirements, conditions of
approval, and permit requirements; nor are the designers relieved of responsibility for
a complete design in accordance with the laws of the state of Washington. This
review is for general compliance with the International Residential Code and
International Building Code as they relate to the project. See IRC Section 105.4.
If you have any questions or need additional clarification, please contact us.
Sincerely,
Alan D. Findlay, P.E.
Building Plan Reviewer, City of Renton
cc: File