Structural Analysis And Mechanical Properties Of 0# Block Of PC Continuous Box Girder

In recent decades, the prestressed concrete continuous rigid frame bridge is applied in traffic construction in C hina.. But the actual statistics found that many bridges have different degrees of disease, especially 0# block, prone to a variety of cracks, the durability of the bridge suffered serious damage.In this paper, the paper analyzes the drawings of the existing continuous rigid frame bridge, analyzes the structural dimensions of the 100 m section of PC continuous box girder 0# section, and ranges the reinforcement ratio of each member.A prestressed concrete continuous rigid frame bridge as the engineering background, through the establishment of 0# segment space finite element model of the fine and elastic calculation analysis of stress distribution and maximum cantilever construction stage is the most unfavorable stage determination of 0# segment space.The stress sensitivity analysis of the structure size of a bridge is carried out, and the variation of the stress of each member is obtained.. According to the results, the reasonable structure size is obtained.. For the 100 m continuous rigid frame bridge, the height of 0# block can be taken as 5.8m、 6m, the web thickness is 70cm~80cm, and the bottom plate is 80 cm ~100cm.The spatial plastic analysis of the 0 segment is carried out, and the crack development of the crack in the 0# segment is simulated. The sensitivity analysis of the reinforcement ratio of each component is done, and the change of the force of the members when different reinforcement ratio is obtained. The effect of the reinforcement ratio on the stress distribution is small. The 100 m block of 0# continuous rigid frame bridge can be reasonably based on the statistical results and codes.