Quake-damaged middle school has faced design questions since it was built in the early 1980s
Source: http://www.alaskastar.com, February 12, 2019
By: Matt Tunseth
Engineers had serious questions about whether Gruening Middle School could withstand a powerful earthquake from the time the school was built, according to a collection of news stories written about the school’s troubled construction in the early 1980s.
“A major earthquake would produce significant damage and a possible partial collapse,” at the school, California engineering firm Forell/Elsesser Engineers Inc. wrote in a 1983 report to the Anchorage School District.
The firm was commissioned by the district after consultants determined the building — which was supposed to open in the fall of 1983 — was seriously flawed, news stories said. An investigation found errors in the engineering calculations and pointed out that the plans for the school didn’t receive oversight from Anchorage building inspectors, who some Eagle River builders resisted at the time. The district eventually retrofitted the school (which opened to students in 1984), but Forell/Elsesser warned inherent design flaws would likely always be an issue.
“It is not possible to overcome all deficiencies without major and costly reconstruction,” the company wrote.
Among the problems outlined by engineers were a sagging roof truss, improperly formulated engineering calculations, stressed walls and what they argued was a fundamentally flawed design.
On Nov. 30, 2018, a magnitude 7.0 earthquake shook the region and caused major damage at Gruening. No students or staff were injured and district officials have yet to detail the extent of damage to the school, but the building has been closed through at least the 2019-20 school year. It’s still unknown whether the damage is related to the design and construction flaws identified in the early 1980s, but newspaper accounts from the period show officials knew even an expensive retrofitting wouldn’t mitigate the risk.
“A seismic risk will continue to a greater degree with a repaired building than if the building had been initially built in compliance with all standards,” Forell/Elsesser Engineers Inc. wrote, according to a story in the Chugiak-Eagle River Star, which covered the issue on a nearly weekly basis in 1983 and 1984.
In the late 1970s and early ’80s, the semi-rural suburb of Chugiak-Eagle River experienced a population boom, growing at four times the rate of neighboring Anchorage. With local school enrollment rising by more than 7 percent a year, Gruening was touted as a state-of-the-art solution to overcrowding at Chugiak High, which was already over capacity, housing both middle-school and high-school students.
In 1978, voters approved a bond package to build a new junior high in Eagle River. Built at an initial cost of $15 million and designed by the architectural firm of Lane, Knorr and Plunkett, groundbreaking took place on April 2, 1982.
Gruening was scheduled to open in the fall of 1983, but problems during the construction process emerged in early 1983 and that spring the Anchorage School District terminated Lane, Knorr and Plunkett citing “communication difficulties.”
“As we moved along, we could see that we were going to be behind schedule,” ASD superintendent Gene Davis said in April of 1983. “It was becoming unrealistic to think that we could make up the schedule and open on time.”
ASD quickly hired Unwin, Scheben, Korynta and Huettl (USKH), Inc. to finish overseeing the project, but the district soon learned its problems were only beginning. That summer, contractor Rogers and Barber sued the district asking for additional funds and claiming the architectural drawings for the school were inadequate.
By the fall, major issues with the building’s design began to become apparent, and rumors were flying about safety and design issues at the not-yet-completed school. In August, the district called a public meeting to discuss the situation with parents.
“Obviously if there is a safety problem we will not move kids into the building,” Davis said at the time.
As the district scrambled to fix the school, some began to wonder whether the problems could have been avoided through a more thorough municipal review process.
“The school superintendent is…perplexed that municipal building inspectors apparently did not review the plans for the municipally-owned building,” Star editor Lee Jordan wrote in an October 27, 1983 editorial. “They apparently refused to do so because Chugiak-Eagle River residents rejected extension of building code enforcement. It was not discovered until after the problems came to light that the municipal plan review had not been made, according to district officials who said the plans were submitted to the city building department and returned without notice that they had been reviewed.”
Chugiak-Eagle River lies within the Municipality of Anchorage but is outside the muni’s “building safety area,” which mandates more strict oversight of building projects in the city than in the semi-rural suburban area north of the city.
MAJOR ISSUES REVEALED
In mid-August, “enough red flags” had been raised that Davis announced the new school would not open for at least the first half of the 1983-84 school year. The main issue was the school’s roof, which engineers said included a poorly designed and constructed truss system that was sagging over the gym. The district commissioned further study of the problem, which Davis was concerned could be larger than just the faulty truss.
“As the system spreads out through the building, we don’t know if the connections (with the faulty truss) will meet seismographic requirements and snow load specifications,” Davis said.
By the start of the 1983-84 school year, 767 junior high students from Gruening were “double-shifting” with about 1,500 Chugiak High students at CHS, with senior high classes starting at 6:30 a.m. and junior high classes beginning at 12:45 p.m.
When the engineering report came back, the true scope of the school’s issues came to light.
“Eye Gruening Demolition” read a headline in the Sept. 29, 1983 edition of the Star. Beneath the headline, Star reporter Ed Bennett detailed a report compiled by San Francisco-based Forrell/Elsesser in which the engineering firm detailed serious structural and design issues with the building.
“The conceptual problem was essentially a criticism of the way the overall shape of the new school would react to the stress of an earthquake,” Bennett wrote of the report.
(On Jan. 28, 2019, the Star requested a copy of the original report through the Freedom of Information Act but as of Feb. 10 had not received the document from the Anchorage School District.)
According to Bennett’s story, the report cited “discontinuities” within the school’s three-section design featuring a central core with two classroom wings — a design the engineering firm said would cause the sections to move independently of each other in a large quake.
At the time, architect Michael Plunkett blasted the firm’s conclusions.
“It’s clear the San Francisco people like box-shaped buildings,” Plunkett said.
Among the other issues detailed in the report were 12 specific violations of the Uniform Building Code, as well as roofs in the gym and multipurpose room that were “overstressed by a factor of three,” cinderblock walls in the music rooms that were too high for their thickness, and roofs and floors in the classroom wings that were too long in relation to their width.
The report was critical of design work done by Plunkett and engineering done by the firm he hired, SWR/Barkshire.
More red flags went up after a magnitude 6.4 earthquake struck on Sept. 6, 1983. According to the Star, ASD building official Bill Echols said the quake caused hairline fractures in more than 20 doors at the school as well as a crack running up a cinderblock wall at the new school.
Plunkett denied the engineers’ assessment, but the preliminary findings caused the district to commission an even more extensive report.
“Nonsense, I just can’t believe that,” he said.
At an October meeting of the Anchorage School Board, engineer Eric Elsesser told the board Gruening had “major deficiencies, which could cause serious problems in a major earthquake.”
Elsesser told the board he found problems with seven floors, six walls and eight roof sections at the troubled school and said he was concerned that the junior high school’s walls of both wood and masonry construction and the different roof planes “will act separately in an earthquake.”
“One of the demands is to keep the building acting as a whole element. We can’t let it separate at its discontinuities. That’s a major concern,” he said.
Elsesser’s presentation went on to detail numerous other issues, including problems with the way beams were attached to walls in the classroom wings; issues with wood ledgers and a hanging mezzanine in the multipurpose room; and poorly designed columns in the gym. He said cinderblock walls in the school were mostly adequate, but wood-framed walls were “frequently badly overstressed.”
Following his report, the school board unanimously voted to authorize his firm to come up with a plan to fix the school.
By that time, the school had caused a flurry of lawsuits to be filed by the district, contractor and architect against one another in the summer and fall of 1983.
NO EASY SOLUTION
Near the end of 1983, the school district reached an agreement with SWR/Barkshire to do the design work to fix the school’s problems for free. The firm also promised to use different employees than the ones who made mistakes in the original plans, according to a Nov. 23, 1983 story in the Star.
When Forell/Elsesser’s final report on how to fix the school came back, the conclusions were dire. According to the engineers, more than 400 places in the school would need to be reinforced, braced, strengthened or replaced in order to bring the school up to compliance with the Uniform Building Code.
“The report said many of the school’s structural problems occurred when a mistake was made in the very early design phase, when the overall ability of the building to resist earthquakes was calculated,” Bennett wrote in a Dec. 1, 1983 Star story.
The report said that in one key formula, the number .33 was used instead of 1.33 when calculating the building’s ability to withstand seismic forces — a mistake engineers said was “a significant error.”
Additionally, the report found the school design lacked “continuity,” which could cause the building to fail in an earthquake.
The report suggested the school district strengthen the school to bring it up to code by making approximately 420 fixes to walls, floors ceilings and beams at the school.
By February of 1984 plans for reconstruction had been made available to the public for viewing at the public library. Needed repairs included fixing the sagging roof truss, attaching steel columns to walls and buttressing cinderblock walls.
Oregon-based Todd Construction was awarded a contract to make repairs, which was supposed to begin in the spring. Though there were several delays in the start of reconstruction due to increased oversight by the municipal building department, by April officials were expressing optimism the school could open by the 1984-85 school year.
“It looks good that we will be able to move into a safe, repaired Gruening Junior High School by the opening day of school,” said Bill Echols, project manager for Heery Program Management, a consulting firm that oversaw several ASD building projects.
Permits were issued for reconstruction in May, and by June Echols said repairs were proceeding on schedule. At that time, the estimated cost of the school — which was designed to hold 800 students — had ballooned to more than $27 million due to repair costs, litigation and additional consulting fees.
In August, district officials assured the public the school was safe and ready to open.
“I said I would not put students in a building unless it was safe,” Davis said during an August, 1983 press conference. “Now we have been able to accomplish that.”
Gruening opened on Aug. 27, 1984 with an enrollment of about 810 students. On Nov. 30, 2018 the school housed roughly 600 students when a magnitude 7.0 earthquake struck the Eagle River area. The school suffered heavy damage and will be closed through at least the 2019-20 school year. The Anchorage School District has not yet said specifically what problems have been found at the school, but draft analysis reports are due this month.
Since the quake, Gruening students have been attending classes in the same building they did before the school was built — Chugiak High. A series of public meetings have been scheduled to discuss what to do with students from both Gruening and Eagle River Elementary (which was also severely damaged in the earthquake) as officials decide the short- and long-term futures of both schools. Meetings will be held to discuss secondary education options Feb. 12 and 21 at Chugiak High and on Feb. 13 and 20 at Eagle River High to discuss elementary school options. All four meetings will start at 6 p.m.