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15. Study on a Simplified Calculation Method for Seismic Response Analysis of Bridge Pier in Icy Water

Author

Niu Lichao, Bo Song, and Fuqiang Qi

Subjects
Pier, Engineering, Seismic response analysis, business.industry, Hydrodynamic pressure, Building and Construction, Structural engineering, Geotechnical Engineering and Engineering Geology, Calculation methods, Finite element method, Physics::Geophysics, Seismic analysis, Earthquake shaking table, Geotechnical engineering, Astrophysics::Earth and Planetary Astrophysics, business, Physics::Atmospheric and Oceanic Physics, Civil and Structural Engineering
Abstract

Under earthquakes, bridges in icy water are subjected to both hydrodynamic pressure and dynamic ice force, and yet effective calculation methods for seismic analysis are not available. In this article, based on the test and numerical study on hydrodynamic pressure and dynamic ice force, a simplified calculation method for seismic response analysis of bridge piers in icy water was established to analyse the influence of free ice and consolidated ice on seismic responses of the pier. Comparison was carried out between the FEM analysis and shake table test, and the results showed that the simplified calculated method is efficient and accurate.

Published
2015

16. Simple calculation method of permanent displacement of slope influenced by dynamic pore water pressure under earthquake.

Author

HUANG Shuai, SONG Bo, NIU Lichao, YE Yangsheng, and CAI Degou

Subjects
*NUMERICAL calculations, *WATER pressure, *EARTHQUAKE aftershocks, *ACCELERATION (Mechanics), *DEVIATION (Statistics)
Abstract

Based on the theory of rotation equilibrium, a simple calculation method for the permanent displacement of the soil slope considering the influence of dynamic pore water pressure under earthquake was put forward, and the method was verified by shaking table test of the soil slope (1.96 m ×0. 9 6 m × 1.20 m of L × W × H) . The results show that groundwater has a greater impact on dynamic characteristics of the slope, and the natural vibration period with 1.0 m groundwater depth is 2. 88 times of that without groundwater. The influence of groundwater on critical acceleration is more significant with the increase of groundwater depth, and the critical acceleration with 1.0 m groundwater depth is reduced by 28% compared with no water. With the increase of water depth, slope of permanent displacement shows an increasing trend. When the peak acceleration of earthquake is 2.0 m/s2, the permanent displacement with full water depth is 9. 8 times of that without water. In addition, with the increase of peak acceleration, the permanent displacement increases dramatically. Permanent displacement with peak acceleration of 2. 0 m/s2 is 6. 9 times of that with the peak acceleration of 1. 0 m/s2 . Compared with the permanent displacements measured by test, the deviation are within 10%, which shows the suggested simple method is accurate. [ABSTRACT FROM AUTHOR]

Published
2014

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