Experimental Investigation on Precast Bridge Deck Panel System
Zhengyu Liu, Brent M. Phares, Seyedamin Mousavi, and Katelyn S. Freeseman
Appears on pages(s):
double-panel overhang; laboratory test; precast deck panel; prestressed half-depth deck
Precast concrete deck panels have been used in the United States for more than half a century. As the precast technique improved and the truck delivery capacity increased, the use of precast deck panels gained increased popularity nationwide because it significantly accelerates bridge construction and reduces the on-site labor cost. This paper aims to evaluate the performance of a new precast deck panel system consisting of a double-panel exterior overhang and a partial-depth prestressed interior deck in laboratory conditions. To achieve the objective, the design concept of the new deck panel system was presented, and two specimens, each consisting of two exterior double-panel overhangs and two prestressed interior deck panels, were fabricated and tested subject to the lateral and horizontal static load, respectively. The results were compared with AASHTO design loading and test results fromsimilar previous research. The horizontal loading test results indicated that the ultimate negative bending moment of the precast deck overhang is approximately 91.6 kN∙m/m (20.6 kip∙in./in.), which is nearly three times that of the AASHTO design moment. The vertical loading test results indicated that both types of panels reached ultimate capacity when a point load reached between 1068 and 1112 kN (240 and 250 kip), leading to a punching shear failure. This value is significantly larger than the wheel load, 71 kN (16 kip) of AASHTO HL-93 design loading. The results also indicated that the prestressed panel shows superior performance to the nonprestressed panel when it is subject to vertical loading. It resists cracking at the lower load level and significantly reduces the vertical deflection when it is subject to vertical load.