The Walt Whitman Bridge connects Gloucester, NJ and Philadelphia, PA, and it carries I-76 over the Delaware River. CHI has served the Delaware River Port Authority on several matters that include: suspender damage investigation, floor truss load rating, and the peer review of tower link monitoring.
Bayonne Bridge Approach Span Construction Support (Staten Island, NY)
Cracks were found in the concrete segmented box girders of the Bayonne Bridge. CHI investigated the causes of the cracks and developed mitigation recommendations. Detailed finite element modeling and analysis and strut-and-tie models were utilized in the investigation.
Beikou Suspension Bridge – Peer Review of Steel Superstructure
CHI performed a peer review of the design of the steel superstructure. A detailed 3D model was created on AutoCAD and was then transferred to a finite element program where fatigue and strength analysis was conducted. Areas of high local stress were identified and reported. Modifications were then analyzed and proposed.
I-395 Signature Bridge (Miami, Florida)
The signature bridge consists of six concrete arches. CHI performed stress analysis and preliminary design of segmental arch sections, laid out post-tensioning tendons for the final condition, and performed erection analysis and design of erection tendons. 3D finite element modeling and analysis was performed for arch segments with suspenders and the center pier. CHI has also been finalizing designs for the center pier, where all six arches converged, and Arch 5, the tallest arch of the bridge.
I-395 Signature Bridge (Miami, Florida)
The signature bridge consists of six concrete arches. CHI performed stress analysis and preliminary design of segmental arch sections, laid out post-tensioning tendons for the final condition, and performed erection analysis and design of erection tendons. CHI also designed the center pier where all six arches converged. 3D finite element modeling and analysis was performed for arch segments with suspenders and the center pier.
Pedestrian Bridge B in LaGuardia Airport, a 450 ft long bridge, consists of steel trusses and plate girders. CHI investigated whether or not pedestrian-induced vibrations were within allowed limits and stress levels at truss connections. Two types of empirical equations and 3D finite element models were used to evaluate pedestrian-induced vibrations at different density and damping levels.
Robert Moses Bridge Pin and Hanger Replacement (Fire Island, NY)
The main spans of Robert Moses Causeway consist of two anchor spans and one suspended span, which are made of steel trusses. CHI provided construction engineering services for Skanska Koch, and the main scope was to design jacking frames and temporary supports for replacing existing pins and hangers. Each temporary support and jacking frame carried 600-ton loads. Global and local models were created for the anchor and suspended spans, and analysis was conducted for dead, live, thermal andwind loads.
Delaware Memorial Bridges Pin and Hanger Replacement (New Castle, DE)
The pins and pin plates of the Delaware Memorial Bridge were found to have worn out since installation in the late 1980's. The DRBA initiated a project to replace the tower links with a state-of-the-art bearing system. CHI designed a unique temporary jacking frame to lift the ends of the suspended spans and relieve loads from existing links. The temporary hanger and brackets are robust, easy to install and remove, and have performed proficiently thus far.
Port Authority New Bus Terminal-- Ramps (Manhattan, NY)
The existing Port Authority Bus Terminal was scheduled to be replaced with a top-down construction method, whereby new ramps would be constructed on top of existing ramps, and progress downwards. CHI generated 3D Revit models for new and existing ramps, and utilized clash detection between existing and new elements. Additionally, CHI created detailed 3D finite element models for new ramps and performed static and dynamic analysis for various loads. Changes of structural systems were implemented to accommodate over-stressing issues.