两跨连续斜交梁桥振动台试验研究

选取了斜交角、配箍率和轴压比等设计参数，对两跨连续斜交梁桥进行结构动力特性分析和单向地震动输入下结构的地震反应分析。以福建省高速公路某座斜交梁桥为工程背景，设计制作了一座1/5缩尺两跨连续混凝土斜交梁桥试验模型，结合振动台模型试验和数值模拟分析，研究斜交梁桥地震响应及震害特点。振动台模型试验结果表明：不同场地类别的地震动及同一场地类别但不同的地震动作用下，结构的加速度响应、位移响应差别较大；在相同斜交角时，轴压比越小，加速度和位移响应越大；当轴压比相同时，斜交角越小，加速度和位移响应越大。从试验可知，在斜交桥设计中，合理选择斜交角对桥梁动力性能有很大的影响。

Research on the shaking table test of a two-span continuous skew girder bridge

Analyze the dynamic structure characteristic and three dimensional seismic wave response of a two-span continuous skew girder bridge, using parameters such as skew angle, shear span ratio, reinforcement ratio and axial compression ratio and so on. Take a skewed girder bridge of Fuzhou for engineering background, design a 1:5 scale two-span continuous skewed girder bridge model for the shaking table experiment, by the shaking table experiment and FEM modeling, study the seismic response rules and destroy characteristic of the skewed girder bridges. Results of shaking table test show that: the structural acceleration response and displacement response are different under different types of ground motion and the same site category but with different seismic action. The smaller of the axial compression ratio, the larger of the acceleration and displacement response with the same skew angle; when the axial compression ratio is the same, the smaller the skew angle, acceleration and displacement response is big. Through the test, a reasonable choice of skew angle has great influence on the dynamic performance of bridge in the design of skew bridge.