Powder Mill Pedestrian Bridge
The Three Trails Bridge Crossing is a 16’ wide by 242’-0” long pedestrian bridge which spans across interstate 435 in Kansas City. HDR Contracted with Premier Engineering Consultants, LLC for structural engineering services on this project for Kansas City Community Improvement District (CID) and Missouri Department of Transportation (MoDOT). It has 4 spans of lengths 46’-0”, 75’-0”, 75’-0”, 46’-0”. The bridge is a 4-span integral concrete bridge with pre-stressed concrete girders. The spans are symmetric about the center and the intermediate bents have similar geometry. The three interior piers are fixed to the superstructure with an integral diaphragm. The abutments or end bents are also integral with the diaphragm. The interior bents are founded on drilled shafts and the end bents are supported on steel H-piling. The bottom of the column or top of the drilled shaft is two feet below the finished pavement elevation.
The drilled shaft is 6’-0” diameter and sits on a 5’-6” rock socket. The column is 3’-0” in diameter and is also integral to the hammerhead cap beam which supports the superstructure. The hammerhead cap beam is 16’-0”X3’-6”. The hammerhead supports the superstructure which is a MoDOT Type 3 pre-stressed concrete girder. The girder supports the concrete slab and rails.
Role: Civil and Structural Design
Kansas City Missouri Community Improvement District