Archive for the ‘Seismic Evaluations & Rehabilitations of Existing Buildings’ Category

The Church of Jesus Christ of Latter-day Saints

Wednesday, July 25th, 2012

Erickson Structural personnel performed a structural and seismic evaluation for The Church of Jesus Christ of Latter-day Saints meetinghouse, located in Portland, Oregon.  The resulting structural evaluation report recommended multiple structural and seismic remediation measures for the  meetinghouse.  Erickson Structural’s proposed seismic upgrade scheme was develop in a manner that allowed for the improvements to be installed in multiple phases to accommodate the owner’s budget and schedule.  The initial phase of the improvements were installed in 2012.

The Church of Jesus Christ of Latter-day Saints

Friday, October 7th, 2011

This 26,500 square-foot, wood, steel and masonry meeting house for The Church of Jesus Christ of Latter-day Saints, located in Salem, Oregon, recently underwent a complete seismic upgrade designed by Erickson Structural.  Both structural and non-structural seismic rehabilitation measures were implemented.  The seismic upgrades were designed to conform to the Basic Safety Objective of ASCE 41-06, as directed by the owner.  Erickson Structural periodically performed site observations to verify that the construction of the rehabilitation measures conformed to the construction documents.

McMenamins Crystal Ballroom

Friday, January 28th, 2011

Erickson Structural personnel were retained to seismically rehabilitate the third floor walls of this historic unreinforced masonry building without impacting the original architectural design.  This challenge was met by using a unique design technique called “center coring.”  Erickson Structural personnel carefully identified sites around the perimeter of the building to core through the center of the walls. After drilling and extracting rubble from each core, rebar was installed and encased in epoxy with fine-tuned viscosity to fill the cores and migrate through the adjacent voids for maximum reinforcement. The resulting building shows no sign of seismic upgrade, and meets the seismic demands required for local building codes.

Although the center coring solution proposed by Erickson Structural personnel was not the least expensive solution, it was by far the most effective method of preserving the building’s architectural and historic integrity, with the added benefit of allowing ongoing use of the dance hall throughout construction. No sign of the seismic upgrade is visible, yet the building is now extremely strong.

This project was featured in the Daily Journal of Commerce (DJC).  Click here to read the article.

R. Walter Dry Building, Washington State School of the Blind

Thursday, January 27th, 2011

Listed on the National Register of Historic places,the R. Walter Dry Building, located in Vancouver, Washington, is a beautiful unreinforced masonry (URM) building that underwent an extensive seismic rehabilitation and remodel, including the removal of several bearing walls.  Erickson Structural personnel provided a comprehensive seismic assessment, developed “as-built” structural documents, utilized FEMA 356 (now ASCE 41) to confirm the shear strength of the building walls, and designed an innovative fiber reinforced polymer (FRP) strengthening scheme to repair the deteriorated concrete floor slab.  Various upgrade schemes were studied to obtain the most economical solution for the owner.

Albers Mill Building

Thursday, January 27th, 2011

Erickson Structural personnel were retained to perform a seismic evaluation of the Albers Mill Building, located in Portland, Oregon.  As a federal agency intended to renew its lease for space in the building, the General Services Administration (GSA) required that the building meet the life safety seismic performance specifications of ICSSC RP6, “Standards of Seismic Safety for Existing Federally Owned and Leased Buildings”, as a stipulation of the lease agreement.  This document utilizes the methodologies of ASCE 31, which represents the current state of the art methodology in the seismic evaluation of existing buildings, and is comprised of three increasingly complex tiers of evaluation.

The seismic evaluation of the Albers Mill Building was conducted according to the procedures of ASCE 31, using Life Safety performance criteria.  The structural and non-structural systems of the building were seismically evaluated.  At the conclusion of the evaluation, a written report and presentation were produced to summarize the resulting findings, conclusions and recommendations.

 

Post-Earthquake Reconnaissance

Monday, November 22nd, 2010

Following the Nisqually earthquake in Washington State’s Puget Sound region and the Wells, Nevada earthquake , Erickson Structural personnel inspected numerous facilities to determine the extent of structural damages. The scope involved a variety of building types, from commercial/retail, hotel/hospitality, and warehouse structures, to private residences, and involved a variety of structural systems, such as, unreinforced masonry, wood framing, and structural steel.

Erickson Structural personnel were required to provide critical information in an extremely tight time frame, and carefully differentiate between new and pre-existing damage.

 

Brigham Young University Seismic Evaluation

Monday, August 23rd, 2010

Erickson Structural personnel were retained to perform a structural evaluation of the existing buildings located on the Brigham Young University Hawaii (BYUH) campus.  The primary objective of this screening phase was to develop a prioritization for future, more detailed, evaluations of individual buildings based upon the relative risk from seismic-, wind- and tsunami-induced hazards.  Erickson Structural personnel documented the inventory of buildings on campus, determined the lateral force-resisting system of each building, and determined the age and materials of construction, based upon a review of the available construction drawings. “Sidewalk surveys” of each building were also performed by briefly observing the interior and exterior of each building, noting specific characteristics that were perceived to influence structural risk.

After the initial screening phase, Erickson Structural personnel were retained to perform detailed structural evaluations of the Joseph F. Smith Library and the Ballroom.  The structural evaluations considered two natural hazard-induced risks: earthquakes and hurricanes.  The evaluations identified structural deficiencies and proposed corresponding remediation schemes to mitigate those deficiencies.  The remediation schemes were developed to a schematic level suitable for scoping and cost estimating purposes, which allowed the owners to make strategic budgetary decisions.