新型可更换构件铁路桥墩振动台试验研究

Shaking table test of a novel railway bridge pier with replaceable member

为研究新型可更换构件铁路桥墩的抗震性能,设计并制作了一个缩尺比例为1/10桥墩模型,选择3条合适的强震地震波,对模型桥墩进行了地震模拟振动台试验。研究了模型桥墩各杆件在各级水准地震作用下的加速度反应、位移反应及次要构件的应变变化规律。试验研究表明:设防地震下横向联结系可以使主要构件和次要构件协同工作,横向联结系中腹杆受力最为不利是耗能杆件,上下弦杆受力较小、不易作为耗能杆件。新型可更换构件铁路桥墩能够实现在小震下保持弹性,强震时利用次要构件耗能减震、保证主要构件震后基本无损伤。

In order to study the seismic performance of the novel replaceable components railway piers,a 1/10 model pier was designed and fabricated,and three strong earthquake records were selected as the ground motion input.The model pier was subjected to seismic simulation shaking table test.The acceleration response,displacement response and strain variation of secondary members of the model pier under different levels of horizontal earthquake are studied.The experimental research shows that the horizontal connection system under the earthquake prevention can make the major component and secondary components work together.The most unfavorable force of the web in the transverse joint system is the energy-consuming rod.The upper and lower chords are less stressed and are not easy to be used as energy-consuming rods.The novel replaceable component railway pier can maintain elasticity under small earthquakes,and the secondary components consume energy and during strong earthquakes,and the main components are basically intact after the earthquake.