TRB PAPER: DESIGN FULL SCALE TESTING OF TEXAS DEPARTMENT OF TRANSPORTATION TYPE SSTR SINGLE SLOPE CONCRETE BRIDGE RAIL ON THIN PAN-FORMED BRIDGE DECK

摘要

Pan-formed girders with bridge decks were developed in the late 1940s resulting from aneed for low cost bridges in rural areas in Texas. Modular steel forms are used to construct thedeck and bridge beams in a single pour and also serve to support the construction loads duringconstruction. Up until 1988, approximately 3750 pan form girder bridges had been constructedon the Texas Highway System. Many of these bridges utilize a 6-inch thick deck with a narrowdeck cantilever. Many of the bridge railings constructed on these bridges do not meet the currentMASH crash requirements. The purpose of this project was to develop a crashworthy retrofitbridge rail that could be anchored on a 6-inch thick pan-formed bridge deck. For this project, theTXDOT Type SSTR concrete rail was retrofitted to the 6-inch thick pan-formed bridge deck.The rail is anchored to the concrete deck using bent anchor bolts that anchor (bolt through) to the6-inch thick concrete deck. The concrete deck was constructed using 3000 psi concrete and asingle layer of reinforcement. In addition, instead of conventional reinforcement, welded wirereinforcement was designed and used in the bridge rail. Analyses and details were developed toincrease the strength of the barrier system at an open joint in the barrier and deck. The full-scalecrash test performed on the retrofit barrier met all the requirements of MASH (l). This paperpresents the analytical and full scale crash test results performed on the retrofit bridge rail design.