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Seismic response of lightweight aggregate concrelte bridges in earthquake-prone areasl

HUI Yingxin;TAI Yuji;JIN Baohong;WANG Haidong;College of Civil and Hydraulic Engineering, Ningxia University;  
In order to study the seismic response of the lightweight aggregate concrete bridges, a typical continuous beam bridge in the earthquake-prone area was selected as the research object. Based on the characteristics of lightweight aggregate concrete materials, the finite element model of the bridge structure was established. Nonlinear dynamic time-history analysis was used to study the influence of the location of the lightweight aggregate concrete material on the dynamic characteristics and seismic responses of the bridge structure, and its internal force and displacement responses were compared with those of the conventional concrete bridge. The results show that the use of lightweight aggregate concrete for only the superstructure or substructure can not reduce the internal force of the pier significantly, while its use for the entire bridge can. The trend of seismic internal force and displacement responses of the bridges and the plasticity development of the piers are different with those of the ordinary concrete bridges. When the lightweight aggregate concrete bridge scheme is adopted, the difference of the structural quality, stiffness distribution and material plasticity characteristics with the ordinary concrete bridges should be comprehensively considered, and a reasonable seismic design scheme should be applied.
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