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ALVIN P. TABAR, P.E.

STRUCTURAL

PROJECTS

High-rise development located in Sai Wan Ho, Hong Kong consisted of 5 towers ranging from 63 stories (699 ft) to 66 stories (719 ft) in height. Towers 2, 3 and 5 are connected by a common 14 ft thick transfer plate above the podium level. Towers 1 & 6 also rest on individual transfer plates. The towers represented one of the earliest applications of typical floor flat slabs utilized as part of the main lateral wind force resisting systems. Extensive wind tunnel testing was performed.	Tung Chung Crescent is the first residential development project in the newly developed town - Tung Chung on Lantau Island. The development consisted of 8 blocks of 40+ stories residential towers. Several tower blocks sit on a common transfer plates. The towers were modeled and analyzed using PAFEC - a general purpose analysis program, to idealize the transfer plates and shear walls as shell elements that cannot be accomplished with the commonly used analytical computer programs at the time.	The apartment tower is located in Prince Edward, Hong Kong. It consisted of 33 stories including car park levels, mechanical floor and a sky garden along with the residential upper structures above the transfer plate. The design called for an irregularly shaped transfer plate to adapt to modern architecture concept. The first project approved by Hong Kong Buildings Authority that utilized typical floor flat slabs as part of the main lateral wind force resisting system.
The project presented the rare chance to design a large mat foundation system supporting 40 stories high concrete residential building sitting on stiff rock with bearing capacity of 100,000 pounds per sq ft on a very complex building layout. Mini-piles were utilized and located strategically to achieve the overall building stability requirement.	The building is a 10 story, 182,000 gsf condominium on Intracoastal Waterway and New River with 7 residential floors above and 3 levels of parking in post-tensioned concrete flat slab construction on concrete columns and shear walls supported by auger cast pile foundations. Fourth Floor accommodates the landscape area and the swimming pool. Post-tensioned concrete transfer girders were required at fourth and third floors to make possible for parking levels below.	The 9 stories concrete mixed-used tower includes retail spaces at ground floor. The building is posttensioned flat slab construction on columns and shear walls supported by auger cast pile foundations. Post-tensioned transfer slab was utilized at first floor to accommodate the layout of the retail spaces below. Outdoor swimming pool is also located in the first floor along with the trellis and other architectural features.
The 120,000 gsf luxury oceanfront condominium consisted of 7 residential floors and one level parking utilizing post-tensioned flat slab construction on concrete columns and shear walls supported by auger cast pile foundations. It has expansive long-span cantilevered balconies with widely-spaced columns in the middle of the building to accommodate for the grand social room in lower floor. The podium level supports the elevated landscape area with water features and emergency vehicular access.	Ocean's Edge at Singer Island is a unique high-rise building with only 40 residences in an 18 stories high tower in post-tensioned concrete construction. Walls were located away from the perimeter of the building to maintain the 360 degree panoramic view of the Atlantic Ocean and the Intracoastal Waterway requiring that floor slabs form as part of the main lateral structural system to satisfy the building stiffness requirements.	The Peninsula on the Southbank of St. Johns River in Jacksonville, FL is a 40 stories high residential building. The building is comprised of post-tensioned flat slab on reinforced concrete walls and columns. The main lateral structural system consisted of the central core walls. To minimize the excavation work, elevator pits were integrated within the 9 ft thick large pile cap.
3 blocks of 41 stories conventionally reinforced concrete towers with wallframe lateral structural system. The project is a prestigious residential development in Hong Kong New Territories with recreational facilities which include a clubhouse, outdoor swimming pool and podium garden.	6 Stories Residential Steel Building on Piled Foundation using steel frames and masonry shear walls from Ground Floor to 2nd Floor. Cold-formed steel frames and metal studs bearing walls were utilized from 3rd Floor to Roof. Floor construction consisted of composite floor system by combining composite steel joists with poured concrete slab, developing a hybrid concrete/steel T-beam in one direction with integrated continuous one-way slab in the other direction.	8 Stories Residential Cast-In-Place Reinforced Concrete Tower with flat slab construction on columns and shear walls on large mat foundation complying with IBC - NJ Edition code requirements. Transfer beams were utilized at ground floor level to accommodate the parking garage layout at the basement floor.
Palazzo Del Lago includes 1,215 luxury hotel rooms and suites and 800 resort residences in 5 blocks of 15 stories towers with car park levels alongside the 114,000 sq. ft of meeting and convention space, and fantasy pool with waterfalls at elevated landscape level. The towers were utilized post-tensioned concrete flat slab on reinforced concrete shear walls and and columns supported on mat slab foundations combined with individual spread footings.	26 stories luxury serviced apartment tower. The structure was designed to withstand high wind loading with ground floor at 320 feet above mean sea level, as well as the 30 feet high unbalanced lateral soil load. Concrete encased wide flange steel sections were utilized to couple the shear walls (HCW -Hybrid Coupled Wall) to minimize their thickness.	21 story conventionally reinforced cast-in-place concrete tower with flat slab construction on columns and shear walls on large piled mat foundation. Cantilevered shear walls were utilized along the property boundary on the east side of the building to accomodate for existing site condition and designed utilizing strut-and-tie method in accordance with ACI 318.
The new building utilized cast-in-place concrete slabs on composite metal deck floor construction supported by steel wide flange beam and girder framing. The site is in close proximity to railroad traffic with potential of ground borne vibration disturbances that may impact the operation of sensitive equipment inside the building. It is also situated in the site that was subjected to deep underground mining in the past and that a potential 20 feet sink hole could develop.	The science building is a four-story facility that houses the biology, chemistry, and physics departments. It is situated in a steeply sloping ground. To contain the unexcavated portion of the site retaining walls were built along the perimeter of the Ground Floor level. To accommodate for vibration sensitive equipment in the laboratory spaces, footfall analysis were carried out and floor framing were fine-tuned to mitigate vibration disturbances during operations of sensitive equipment.	3 stories Arts and Interactive Multi-media Building within The College of New Jersey campus. Slabs are normal weight concrete on composite metal deck that sits on steel girders supported by CMU bearing walls. CMU bearing walls also act as main lateral structural system and as backup walls to brick veneers.
Major renovation of a former dining hall, servery and kitchen building that was built in 1969. The work also include building code compliance, accessibility improvements, as well as mechanical, electrical and plumbing systems improvements related to the conversion of the building use.

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