FREE VIBRATION RESPONSE OF LONG MULTI-SPAN BRIDGES ACCOUNTING FOR SOIL-STRUCTURE INTERACTION

2021 ◽  
Author(s):  
Pieter Reumers ◽  
Geert Lombaert ◽  
Geert Degrande
Keyword(s):  
Free Vibration ◽  
Soil Structure ◽  
Vibration Response ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Free Vibration Response

Free Vibration Characteristics of Structures With Nonlinear Underlying Soil

1991 ◽  
Vol 113 (1) ◽  
pp. 95-99
Author(s):  
Kamal A. F. Moustafa ◽  
M. El-Gebeily
Keyword(s):  
Perturbation Theory ◽  
Shear Modulus ◽  
Free Vibration ◽  
Nonlinear Model ◽  
Soil Structure ◽  
Natural Frequencies ◽  
Nonlinear Behavior ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Underlying Soil

Free vibration of structures is investigated by using a multidegree of freedom nonlinear model that allows for nonlinear behavior of the soil underlying the structure. The considered nonlinearity is due to the dependence of the soil shear modulus on vibration levels. The soil-structure interaction is modelled as nonlinear complex stiffness. The analysis is carried out by using mathematical perturbation theory. Modifications in the natural frequencies and existence of harmonics are demonstrated. The results are applied to an application example of massive deep water gravity structure.

Fluid–Structure Interaction Effects on Free Vibration of Containerships

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Shahrokh Sepehrirahnama ◽  
Dong Xu ◽  
Eng Teo Ong ◽  
Heow Pueh Lee ◽  
Kian-Meng Lim
Keyword(s):  
Free Vibration ◽  
Natural Frequencies ◽  
Hydrodynamic Pressure ◽  
Added Mass ◽  
Vibration Response ◽  
Mode Shapes ◽  
Operation Condition ◽  
Structure Interaction ◽  
The Impact ◽  
Free Vibration Response

The interaction between fluid and structure affects the vibration response of the structure due to the additional hydrodynamic pressure. These effects are accounted for by incorporating the so-called added mass into the vibration equation of the structure. In this paper, a containership was used to study the impact of the added mass on its free vibration response. The natural frequencies of the ship decrease after including the added mass in the vibration analysis. It is shown that the frequency-ascending sequence of the wet mode shapes, for which the added mass is accounted for, may differ from that obtained for the dry state of the ship. Also, the effects of different draft levels on the mode shapes of the ship are reported. These results provide a better insight for designing ships based on their wet-state frequencies and mode shapes, which is the typical operation condition when sailing in the open seas.

Impact of Different Style of Tower-Beam-Connection on Cable-Stayed Bridge's Earthquake Response

2014 ◽  
Vol 539 ◽  
pp. 726-730
Author(s):  
Yu Chen
Keyword(s):  
Free Vibration ◽  
Seismic Response ◽  
Soil Structure ◽  
Response Spectrum ◽  
Soil Structure Interaction ◽  
Earthquake Response ◽  
Structural Systems ◽  
Bridge Construction ◽  
Structure Interaction ◽  
Internal Forces

In this thesis, Three structural systems of main towerbeam-consolidation, two tower-beam-consolidation and none-tower-consolidation with the pile-soil-structure interaction are established ,free vibration characteristics and seismic response of three structural systems are investigated, and seismic response of Response spectrum and Earthquake schedule are analyzed respectively and compared. Studies have shown that in the process of the bridge construction, because of the small span, internal forces were the control action and the displacement is the second.

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