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首页> 外文会议>High performance and optimum design of structures and materials >Dynamic responses of a steel composite bridge subjected to a moving high speed train load in comparison with a PSC box girder bridge
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Dynamic responses of a steel composite bridge subjected to a moving high speed train load in comparison with a PSC box girder bridge

机译：与PSC箱梁桥相比，高速列车荷载作用下钢复合桥的动力响应

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Dynamic responses of a high speed railroad steel composite bridge have been investigated experimentally and compared with responses of a prestressed concrete box girder bridge which is one of the most typical types in the Korean high speed railroad. A two I-shaped steel composite girder bridge (1@40m) and a prestressed concrete box girder bridge (2@40m) have same span length of 40m, but one is simply supported and the other is continuous. Therefore, for direct comparison, the fictitious steel composite continuous bridge (2@40m) was numerically modeled based on a nominated design process. A set of experimental tests were performed during the operation of KTX, and dynamic responses (vertical accelerations and vertical displacements) were measured. Measured responses show that the vertical displacements of tested bridges all satisfy requirements for passenger comfort, but vertical acceleration responses were also found to be very close to the limit value for traffic safety. It was found that most of the excessive acceleration responses occurred when the passing speed of the train is close to the critical speed which causes resonance.
机译：通过实验研究了高速铁路钢复合桥的动力响应，并将其与韩国高速铁路最典型的预应力混凝土箱梁桥的动力响应进行了比较。两座工字型钢组合梁桥（1 @ 40m）和一个预应力混凝土箱梁桥（2 @ 40m）的跨度相同，为40m，但其中一个简单地支撑，另一个是连续的。因此，为进行直接比较，基于指定的设计过程对虚拟钢复合材料连续桥（2 @ 40m）进行了数值建模。在KTX的操作过程中进行了一组实验测试，并测量了动态响应（垂直加速度和垂直位移）。实测响应表明，测试桥梁的垂直位移均满足乘客舒适度的要求，但垂直加速度响应也非常接近交通安全极限值。已经发现，当列车的通过速度接近引起共振的临界速度时，大多数过度的加速度响应就会发生。

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