Abstract

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Title:: Trial-design Study on Jointless Bridge with Approach Slab Supported by Micro-piles

Author(s):: FU Cui; ZHUANG Yi-zhou; CHEN Bao-chun; College of Civil Engineering, Fuzhou University

Keywords:: micro-pile; jointless bridge; trial-design; finite element model; pile-soil interaction; seismic response; time history analysis

Abstract:: In order to study the mechanical behavior of jointless bridge with approach slab supported by micro-piles, trial-design of the new type structure was carried out, and the full bridge spatial finite element model considering micro-pile-soil interaction was built by MIDAS/Civil. The mechanical behaviors of the trial-design bridge and the original bridge under constant load, automobile load and approach slab settlement were compared and analyzed. The mechanical behaviors of the bridges under temperature, shrinkage and creep, and the expansion between approach slab and approach pavement were also analyzed. The natural vibration characteristics and seismic response of the bridge were studied by modal analysis and seismic time history analysis. The results show that the positive bending moment of the side span of the trial-design bridge main beam under vertical load decreases, while the settlement of approach slab decreases. The restraint effect of the micro-pile will increase the axial force of the main beam under the influence of temperature rise, temperature drop, and shrinkage and creep. The displacement response of the trial-design bridge under seismic loading is reduced, and the seismic performance of the bridge is improved. The study can provides references for the design of jointless bridge with approach slab supported by micro-piles, and can promote the development and application of this new kind of jointless bridge in the actual engineering.