Jones Bridge Pedestrian BridgeTeam Members: Spencer Kopf, Rosemary Brunner, Brandon Cruztitla-Juarez

Faculty Advisor: Dr. Stephan Durham, P.E.

Sponsor/Client: The City of Johns Creek/Jacobs

Ramp Design Site Design Background

Hydrological Analysis Structural Analysis Bridge Plan

The City of Atlanta hopes to create anetwork of trails rounding the CRNA in metroAtlanta. Replacing a collapsed truss bridge inJones Bridge Park will connect the park tothe Jones Bridge Unit of the CRNRA. Thisbridge will allow park users to access theamenities offered by the CRNRA, and createa network of interconnected trails in themetro Atlanta area.

The pedestrian bridge will be located over shallow rapids for stronger supports with easy access from both sides of the Chattahoochee River. A rubberized trail will be added on the west side to connect to an existing trail leading to Jones Bridge Boat Ramp.

Each side of the pedestrian bridge connects to landings and ramps complying with ADA requirements. Both end spans have landings at least every 30’ horizontal with a 1:12 slope and hand railing along each end of the deck width. Steel beams and columns are used with a 4” reinforced concrete deck designed based on load requirements.

Bridge elevation is dependent on the hydrology of the site on the Chattahoochee River. The main concern lies with the 100-yr. flood levels. Based on research and simulations, the water has a maximum elevation of 900 ft. at the 100 year storm.

A structural analysis was done in SAP2000 todetermine the most feasible design to spanthe 540’ it would take to cross theChattahoochee River. The results from thisanalysis are the basis of the structuraldesign of steel member sizing used in thebridge. Once the bridge is modeled, and theapplicable loading cases are applied, thedeflection, moment, shear, or axial load canbe determined at any member at anypoint..

Our bridge plan consists of 3 identicalprefabricated metal truss spans eachwith a concrete deck. The deck iselevation above the 100-yr floodplain.The design also consists of fourcircular concrete piers, two pier caps,and an abutment on the east andwest end of the bridge.

•Data sourced from the United States Geological Survey (USGS). The 5, 10, 25, 50, and 100 year storm data is taken from the database.•USGS data is used at inputs into the HEC-RAS program. A cross-section of the channel is modeled and simulations are run to determined the water level height of each storm.