185-ft Steel Joists and Dovetail Deck For High School Gymnasium Building
2024-9-8 20:32:47
185-ft Steel Joists and
Introduction
185-ft Steel Joists and Dovetail Deck For High School Gymnasium Building
Middle High School Competition Gym
The competition gym will seat 2,300 in an arena-like facility. Creating that kind of atmosphere necessitated intense thinking on the part of architectural firm Associates and a flawless game plan for building it. The facility also includes spaces for the future home of the wrestling and cheerleading squads.
The gymnasium arena features 185-foot-long, 12-foot-deep double-pitched steel joists supporting acoustical architectural roof deck that soars 46 feet off the floor. In addition to the challenge of scale, the project had two other primary demands. The design of the new arena needed to match the architectural style of the existing school, which is based on a circle with curved walls. It also had to control the acoustics associated with screaming fans and the sounds of intense competition.
Confronting a trio of design challenges
Double-pitched joists
To achieve the professional atmosphere of Arena, 14 of the 185-foot joists were used to create massive clear spans. the joists’ length is close to maximizing our capabilities.
The joists support not only the roof deck, roof-top units and suspended basketball goals but also the enormous scoreboard being planned to hang over center court.
All those elements come together to make a tremendous first impression of the wide-open expanse and four sides of seating.
Like a literal square peg in a round hole, the new Arena presented a design challenge from the jump.
There are a lot of curves in the existing building, So we knew we couldn’t just take a basketball arena, which is basically a rectangle, and stick it on the end of a circle. It would look completely out of place with no design context.
To create architectural continuity, ZHM Huawu Steel team envisioned a sweeping curved wall on the west side of the Arena.
That decision impacted a series of other design and erection considerations. A curved wall would have necessitated joists of different lengths and roof deck panels individually cut to fit. Realizing this issue, the orientation of the 185-foot open web joists was reconsidered to eliminate the need for differing lengths. Roof deck installation was adjusted in the field to match the curve. The solutions required teamwork between the architect, the structural engineer, ZHM Huawu Steel and the erector.
Acoustic control
Cheering. Squeaking sneakers. Bouncing balls. A booming sound system. Anyone who’s ever been to a high school gymnasium during a basketball game can tell you how loud it can be.
That also was a guiding concern. ZHM Huawu Steel selected acoustical dovetail roof deck to control the ambient noise in the main gym without using additional sound-mitigating material. The final result passed the test.We had an acoustician doublecheck sound levels and spaces
Solutions that rise to the occasion
Solving the three main design challenges of the new High School gymnasium required a project team performing at the top of its game. Nowhere was that more apparent than with the complex design and erection of the joists and acoustical dovetail roof deck.
Steel Joist solutions
Before they were even manufactured, the joists exposed a problem. With one side of Arena designed as a symmetrical arc, a realization set in.
We had the joists intersecting the curve, so that meant only two joists would have been the same length—one on the north side and one on the south side. It would be more economical to run the joists along the long span instead of the short span. That way they’re all the same length. It will be much more economical to fabricate them even though they will be longer.
Because of their length, the 14 joists were built in two pieces then joined in the field via a bolted connection.
The Gym Arena’s expansive size—both in length and height—demanded special attention during joist erection.ZHM changed the orientation of the joists to run parallel with the length of the basketball/volleyball court. That changed the whole way the joists would be erected.
It’s typical to build these long-span trusses on the ground and then bring in a large crane to set them in place from the outside of the building,The building’s layout and lack of space at the cramped job site eliminated this erection method. Instead, ZHM erected the joists in two pieces inside the building.
First, ZHM’s team erected a row of shoring 34 feet high, positioned to support the middle of each joist. The shoring was built over three days and engineered to support 20,000 pounds, 10,000 more than required.
Using a crane, half of each 185-foot joist was maneuvered into place and secured to a steel frame.
Days later, the other half of each joist was positioned and bolted to the first half.
Finally, with the joists now one piece, the scaffolding was disassembled and removed.
Erection of Steel Joists and Girders
The first step in the steel joist installation is the erection of a row of shoring 34 feet high.
We had to do a preliminary design on the gym joists to determine the geometry so that we could give the erector the location of our panel points,This enabled them to locate their shoring towers so that when the joists arrived they were ready to erect.
The design of the joists had to reflect the shoring and erection plans.
Part of our coordination was ensuring that we had all of the proper bridging locations and number of rows of bridging determined for the safe erection of the joist halves. Special consideration had to be given to the design of the joists as well since the south half of the joist was now considered an independent structure with the typical underslung bearing condition at the south wall and the bottom chord bearing condition at the shoring tower.
The early design work and cooperation paid off, as joist erection went smoothly. It was a simple process. It did not require a lot of geometry planning with the size of the joists. Other trades were able to continue to work during erection because we weren’t shutting down a lot of job site for very long. We were able to use a smaller crane. We were able to use less equipment and less manpower for one single lift with the short pieces compared to the long pieces.
With the project slightly behind schedule because of a particularly rainy winter, the time saved using this erection method was important. As the ZHM Huawu Steel Erectors team installed the shoring, the rest of the project team continued working elsewhere on the facility.
If we were to have built all of these on the ground as a full-span joist, it was going to take close to four weeks with a two-week duration to shut down the project to other trades,We picked up almost two weeks of time doing it this way.
We only have so many man hours to build this building on budget. This just really simplified our setup process.
High Middle School construction crane lower joist into position
After shoring was erected, cranes first brought in one side of each of the 14 super-long-span joists. A few days later, the second side of the joists were delivered, set into place and bolted together.
In addition to mitigating the noise generated during intense basketball games or volleyball matches, the acoustic dovetail roof deck introduced costs savings
It has become common knowledge that it’s actually more affordable to use acoustical deck than it is to do dropped ceiling sometimes, By spending a little bit more money for the deck, we end up saving a lot more money because now we don’t need as much acoustical material inside the space.
The acoustical deck, in this case Versatile-Deck LS 3.5 acoustical, achieves a noise reduction coefficient of .95. The deck is painted white, in keeping with the school’s blue-and-white color scheme.
See our dovetail roof deck solutions
Curved architectural solutions
The sweeping, west wall of Gym Arena helped create a unifying look at High School but complicated installation of the dovetail roof deck. Each deck panel that came in contact with the curve had to be cut in the field to match, a time- and labor-intensive step.
ZHM Huawu Steel has to ensure that they’re providing enough deck, so that it can be field-modified, The installers in the field have to figure out ways to modify that deck so that it can fit this curved profile of the west side of the building.”
Gym Arena is made up of a combination of concrete masonry unit (CMU) walls and light-gage steel walls that are supported by a steel frame. Changing the joist orientation to run parallel with the court required special work connecting the roof deck to the CMU walls, as the joists do not come in direct contact with the CMU walls.
The challenge was especially significant along the west-side curved CMU wall, Adams says. The steel frame beams form a segmented arch on that side, he explains, leaving a gap between the beams and the CMU wall.
The solution involved a rolled steel angle that “hugs” the CMU wall connected to an 8-inch steel plate that extends from the top of the metal stud-framed wall.
The consultants and ZHM worked through some of these items on the phone and/or emails, and ZHM Huawu Steel suggested the solution of using flat plates cantilevered off of the steel beams to support the rolled steel angle, Then the angle catches the steel decking and ties the roof decking diaphragm to the exterior wall and structure.
It was an out-of-the-box thinking solution.
See our steel joist solutions
A lift to the community
When it’s complete, the High School gymnasium will give the school a contemporary look that blends with the existing structure. Inside, athletes, students, staff and the community will be treated to an exciting atmosphere, with seating on all four sides as well as the corners of the court.
The High School play their first basketball game in the arena in November. The date represents the culmination of more than a year’s work involving a team of invested collaborators with one goal in mind: Give the community something to be proud of for years.
High School interior arena entry
Exposed dovetail roof deck is featured in GymArena’s entry areas.
ZHM Huawu Steel, as the project structural designer, detailer, fabricator, We’re proud of it, and we’re excited for the client local community,We feel like it’s an investment. It gives us a lot of sense of pride. For the athletes and the student body, it gives them something to strive for. Architecture does evoke thoughts and emotions and feelings—a space will make you feel a certain way.
Why ZHM Huawu Metal 185-ft Steel Joists and Dovetail Deck For High School Gymnasium Building ?
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| Reliable and Customized Designs | Cutting Edge Designing Process | Free Online Price System | Easy Bolt-by-number Assembly |
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| Over Two Decades of Experience | Value For Money | Unmatched in Quality and Craftmanship | Excellent Customer Service |
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