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| Shaking table tests and pounding parametric analysis for structure collision under multi-dimensional seismic excitations |
| YAN Lei1,LI Qingning2,YUE Kefeng1,ZHAO Huajing2,SHEN Jiwei1， WANG Tianli2 |
1.School of Civil Engineering,Chongqing Three Gorges University,Chongqing 404100,China;
2.School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China |
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Abstract Aiming at bridge structure collisions causing serious disasters under the action of strong earthquake, shaking table tests for 4 designed and built groups of structure collisions with variable parameters under multi-dimension seismic inputs were conducted, and effects of seismic intensity and dimension on impact responses between adjacent structures were studied. The results showed that the greater the seismic peak acceleration and the more the seismic dimensions, the greater the pounding force between adjacent structures; different pounding elements can either be used to simulate the maximum pounding force between structures, but it is appropriate to choose Jan-Hertz-damp model with a higher accuracy to implement pounding calculations; the selection of contact stiffness in the pounding model causes the calculation results may not really reflect pounding responses between structures, and different seismic waves may make pounding stiffness value change; the effect of pounding gap value on the maximum impact force between structures has no uniform law, and the optimal pounding gap should be calculated for different structures; the shorter the pier height, the smaller the pounding force between adjacent beams, but the shear action at pier bottom is more obvious; the pounding force between adjacent structures and the shear force at pier bottom increase with increase in their mass ratio and the pounding recovery coefficient, and their increasing amplitude is different under different seismic waves.
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Received: 10 April 2017
Published: 28 July 2018
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