B型斜连续箱梁桥结构动力试验分析研究

B-Type Skew Continous Box Gird Bridge Dynamic Test Analysis

以某三跨斜连续箱梁桥为工程背景,采用实体单元模型和空间梁单元鱼刺骨模型进行结构动力分析,探讨了结构自振频率和振型随斜度变化规律,并通过桥梁荷载试验进行对比分析,结果表明实体单元模型计算结果更为可靠。根据实体模型振型,建议在宽斜箱梁桥的模态试验中,采用在箱梁两侧均布置传感器的试验方法,以求获得更为准确的结构振动试验数据。

This paper take a three-span skew continuous box girder bridge as engineering background, analysised the structure daynamic characteristics by using solid element model and spatial beam element model, studied natural vibration frequencies and modes with changes of skew gradient, And through comparative analysis of bridge load tests, The results show that the solid element model results more reliable. According to mode analysis based on solid element model, suggest that in wide skew box girder bridge mode testing, the sensors should arrange on both sides of the box to obtain more accurate structural vibration test data.