Response property of deep-water bridge pier under near-fault earthquakes and inspection of calculation methods of hydrodynamic effect(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年04期
- Page:
- 48-57
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Response property of deep-water bridge pier under near-fault earthquakes and inspection of calculation methods of hydrodynamic effect
- Author(s):
- JIANG Hui; WANG Bao-xi; BAI Xiao-yu; ZHU Xi; ZENG Cong
- (1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. China State Construction Engineering Corporation AECOM Consultants Co. Ltd., Lanzhou 730099, Gansu, China)
- Keywords:
- bridge engineering; deep-water bridge; equivalent bridge pier; fluid-structure interaction; analytical-numerical method; near-fault earthquake; added-mass; dynamic response
- PACS:
- U442.55
- DOI:
- -
- Abstract:
- Hydrodynamic effect is an important issue which should be taken into account in seismic design of deep-water bridges, and the response property of deep-water bridge pier under near-fault earthquakes and its reasonable computation method needs to be studied. Therefore, taking a typical deep-water bridge as research subject, this paper built the equivalent pier model based on complete numerical method considering fluid-structure interaction. The influence of water range on stability of results was analysed firstly. Then the vibration and response characteristics of the deep-water pier excited by impulsive near-fault ground motions were discussed. Furthermore, the accuracy of several typical analytical-numerical methods was checked. The results show that the vibration frequency tends to be stable when the water width is 10 times of pier’s diameter. The vibration period and dynamic response of pier is amplified by hydrodynamic effect, and this influence becomes more significant with the increase of water depth. The first three vibration periods of pier with full-water around increase by 5.3%, 12.2% and 17.9%, while the maximum bending moment, shear force and displacement increase by 22%, 23% and 20% respectively under near-fault earthquake. The error rates of different methods vary with the change of water depth. The calculated response by Morison equation method is larger than that by complete numerical method, and the error rate is beyond 6%, while that by Japanese code is smaller and its error rate is close to -5%. The calculated results by radiation wave theory, Chinese railway code and LI Qiao-Yang Wan-li’s formula are quite close to that by complete numerical method, which means these methods are applicable to deep-water bridge of usual sizes. The above research results could provide reference for seismic design of deep-water bridge near active fault zone.
Last Update: 2016-07-29