mixed_park_2Downtown Long Beach, California, received a facelift in 2003 with the addition of $120 million Park at Harbor View project which overlooks historical buildings and landmarks, including the Queen Mary. The mixed-use development is designed to provide a transition from a high-rise office building zone on the north end to a residential low-rise building with ocean view to the south. Located in one of the fastest growing areas in Southern California with unique geopolitical importance, this project provides much needed housing in the urban setting of Long Beach, nestled between Los Angeles and Orange Counties.

Part of a larger planned development that includes 246 condominium units, 538 apartment units, 25,000 square feet of retail/commercial space, and a 500-room hotel. The nearly completed first phase consists of apartment units, retail space, clubhouse, and leasing office in four, four-story and two, nine-story buildings. The clubhouse, located at the corner of Cedar Street and Walk of the Thousand Lights, creates the image of the town square, planned to be the visual focal point and center of activity for the community. The project includes a park and an elevated plaza with public access podium, two-story parking garage, and heliport.

The foundation system is composed of precast pretensioned driven concrete piles with cast-in-place reinforced concrete caps and grade/tie beams with a 5-inch concrete slab on grade. Piles are 14 inches square placed in groups of two to eight per pile cap and vary in length between 25- and 32-feet. Grade beams are 3- to 4-feet thick and 3- to 6-feet wide. Tie beams are 2- to 3-feet thick and 1- to 2-feet wide.

The floor system in the towers and the parking garage consists of a 7-inch post-tensioned concrete slab that changes to a 12-inch post tensionedconcrete slab at the podium over a typical span of about 27- to 30-feet. Also, the floor system incorporates column capitals and shallow post tensioning (PT) beams at selected locations where unusual loading conditions or long spans occur. The garage levels and the floors of the towers are supported by reinforced concrete columns with compressive strengths up to 5,000 psi. Typical square column sizes vary from 12- to 22-inches.

Lateral force resistance for the garage and towers is provided by a reinforced concrete shear wall system. Both the garages and the buildings above are divided into three independent structures separated by seismic expansion joints 3- to 4-inches wide. Due to plan and height irregularities, the shear walls were distributed based on 3-d analysis for each structure.The thickness of the walls varies between 14 inches at the towers to 18 inches at the garage levels.

mixed_park_1Concrete structures with post tensioned decks are proven to provide a superior structural solution for
mid-rise buildings in Southern California. Reinforced concrete structures naturally satisfy durability
concerns, given the highly corrosive environment in coastal areas. Reinforced concrete structures are also economically competitive, since the natural resources are widely available in the region. Seismic design and performance of concrete buildings with PT slabs are significantly improved as well. Use of PT decks minimizes slab thicknesses, thus reducing the overall weight of a structure up to 30% compared to ordinarily reinforced structures.

Desirable fire rating is commonly achieved in concrete structures with virtually no additional costs compared to other construction materials. Concrete construction provides superior vibration control, which offers occupants a higher level of comfort. All of these factors made concrete the material of choice for the Park at Harbor View.

Credits

Owner/Developer:
Camden Development, Houston, Texas

Architect:
Ark Architecture, San Diego, California 

Structural Engineer:
BFL Owen & Associates, Los Angeles, California

General Contractor:
Camden Development, Houston, Texas

Concrete SubContractor:
Largo Concrete, Campbell, California

Year:
2003