An integral precast approach slab to bridge connection

Abstract

This paper presents the findings of the investigation of two approach slabs (a cast-inplace slab and a precast panel slab) integrally connected to two parallel bridges. The goal of using the integral connection is to eliminate the "bump at the end of the bridge". The investigation's primary objectives were to evaluate the approach slab behavior and the impact of the approach slabs on the bridge. A long-term structural monitoring system consisting of various vibrating wire transducers were installed. From the year-long monitoring the following general conclusions were made: (1) the integral connection appears to function well with no observed distress or relative movement between the approach slab and bridge; (2) the approach slab to the bridge connection appears to impact bridge behavior; (3) the two different approach slabs appear to impact the bridge differently; (4) the measured strains in the approach slabs indicate a force exists at the expansion joint which should be taken into consideration during the design stage; (5) the observed responses generally followed an annual cycle with short term cyclic patterns also apparent.