Design of Main Bridge of Luanzhou Jiajiang River Pipeline Bridge in Changzhou

The main bridge of Luanzhou Jiajiang River Pipeline Bridge in Changzhou is a rigid-frame and continuous girder bridge with span arrangement(102+2×180+102) m.The superstructure of the bridge is of a single cell single box girder.At the intermediate main piers,the girder is rigidly fixed with the piers while on the side main piers,the bearings are arranged.The piers No.7~9 are the main piers,employing reinforced concrete double thin-wall rectangular solid piers of constant section,of which the pier No.7 and pier No.9 are arranged with the bearings and the pier No.8 is rigidly fixed with the girder.The pier No.6 and pier No.10 are the transition piers,employing reinforced concrete rectangular solid piers of constant section.The foundations for the pier No.7 and pier No.9 are each composed of 16 nos.of 2.5 bored piles while the foundation for the pier No.8 is composed of 20 nos.of 2.5 bored piles and the length of all these piles is 86 m.To check if the structure of the main bridge could meet the relevant requirements in the codes,the MIDAS 2006 was used to set up the model of the bridge in terms of spatial beam element and the mechanical behavior analysis was made.The results of the analysis reveal that the calculation of the static force,collision resistance and seismic resistance of the bridge can all meet the requirements.