9300 W MALL DR 2019-06-25 - Laserfiche WebLink

DEl DIBBLE ENGINEERS INC February 23,2017 City of Everett,Washington Engineering Public Services Department 3200 Cedar Street Everett,Washington 98201 Attention:Mr.James Bronder,PE,Plans Examiner Re: West Mall Place Apartments Structural Repair DE1 Project#:15-555 Plan Check#:B1701-040 through.042 Dear Mr.Bronder: Thank you for your comments in coordination of the West Mal Place Apartments Structural Repair project,located at 9300 West Mall Drive,in Everett Washington. Your comments for clarification are appreciated in aiding the design of this project We are writing to provide responses to your comments of a structural nature. In the following text,we will quote each question from your Plan Check letter and provide a response. 1. On the General Structural Notes,sheet S1.0'Building Code&Reference Standards",the design code used for this project is the IBC 2015. However,on the permit structural calculations where the wood shear walls are checked against the design demands(for example, Bldg A 1st Floor Walls),it appears that the IEBC Section 404:2.1 is used to check for 75%of the IBC 2015 design demands,which is in conflict with the intent of the using the IBC 2015 full lateral design demands for wood shear walls. Please verify which code is being followed for the design of the wood shear wall repair and update the drawings and notes as required for the appropriate building code. DEl Response:Thank you for your question. We have used the 2015 IBC for the design of this project.Per Section 101.4.7 of the 2015 IAC "The provisions of the International Existing Building Code shall apply to matters governing the repairs,alternation, change of occupancy,addition to,and relocation of existing buildings." 2. On the permit structural calculations where the wood shear walls are checked against the design demands (for example, Bldg A 1st Floor Walls),the use of HDU 5 hold down anchorage appears to exceed the Demand Capacity Ratio(DCR)by nearly a factor of 3.0(10.9 kips/3.8 kips=2.87)even when using 75%of the lateral forces in the IBC 2015. Please provide an alternate detail and calculations for these HDU5 holddowns that are exceeding the DCR values of 1.0. DE1 Response:The design intent of this project is to provide a series of retrofit design and detailing recommendations that are classified as'Voluntary Seismic Upgrades,"based upon areas that are accessible during the course of the architectural cladding remodel. Fundamentally these upgrades are not DIBBLE ENGINEERS INC 1 1029 Market Street, Kirkland WA 98033 1 425.828 4200 1 dibbleengineers.com