Simplified analysis of frame structures with viscoelastic dampers considering the effect of soil-structure interaction

2017 ◽  
Vol 16 (1) ◽  
pp. 199-217 ◽  
Author(s):  
Xuefei Zhao ◽  
Shuguang Wang ◽  
Dongsheng Du ◽  
Weiqing Liu
Keyword(s):  
Soil Structure ◽  
Soil Structure Interaction ◽  
Frame Structures ◽  
Structure Interaction ◽  
Viscoelastic Dampers ◽  
Simplified Analysis

scholarly journals Optimal Design of Viscoelastic Dampers in Frame Structures considering Soil-Structure Interaction Effect

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Xuefei Zhao ◽  
Shuguang Wang ◽  
Dongsheng Du ◽  
Weiqing Liu
Keyword(s):  
Soil Structure ◽  
Structural Response ◽  
Soil Structure Interaction ◽  
Optimal Placement ◽  
Soil Types ◽  
Frame Structures ◽  
Structure Interaction ◽  
Viscoelastic Dampers ◽  
Fixed Base ◽  
Multistory Frame

The seismic response control of multistory frame structures using optimally placed viscoelastic dampers (VEDs) within consideration of soil-structure interaction (SSI) effect is investigated in this paper. The system is assumed to be elastic and responses of the system are obtained in frequency domain for stationary random seismic excitations. The optimal designs of VEDs in structures are achieved through genetic algorithm (GA) by minimizing the maximum response quantities of the system for a determined total amount of viscoelastic material. Two typical elastic multistory frame structures with different soil types and foundation embedment ratios are considered to demonstrate the optimization process. It is shown that the VEDs have the best control of the structural response for fixed base condition and the control efficiency decreases as the soil becomes softer. The optimal placement types of VEDs for different soil types differ from each other. With the decrease of soil stiffness, the optimal locations of VEDs have a tendency to shift to top floors.

scholarly journals Soil-structure interaction effects on the seismic performance of frame structures

2019 ◽  
Vol 18 (2) ◽  
pp. 349-363
Author(s):  
Dhahbia Guerdouh ◽  
◽  
Salah Khalfallah ◽  
Keyword(s):  
Seismic Performance ◽  
Soil Structure ◽  
Interaction Effects ◽  
Soil Structure Interaction ◽  
Frame Structures ◽  
Structure Interaction

scholarly journals Assessing the Dynamic Behaviour of Midrise Frame Structures Sitting on Silty Sandy Soil

2020 ◽  
Vol 14 (1) ◽  
pp. 262-288
Author(s):  
Sahar Ismail ◽  
Fouad Kaddah ◽  
Wassim Raphael
Keyword(s):  
Sandy Soil ◽  
Shear Force ◽  
Soil Structure ◽  
Numerical Models ◽  
Response Spectrum ◽  
Flexible Structures ◽  
Soil Structure Interaction ◽  
Frame Structures ◽  
Lateral Deflection ◽  
Structure Interaction

Background: Midrise 5 to 15 storeys frame structures sitting on soft soils are susceptible to damage induced by seismic events. The level of damage is related to the interaction between the structure, foundation and soil called Soil Structure Interaction (SSI). If the level of ground acceleration is low, the wave gets amplified putting the structure at risk of collapse. Objective and Methods: Concerns about SSI have motivated several researchers to investigate the seismic behaviour of structures rested on cohesive and cohesionless soils. The objective of the work presented in this paper is to evaluate the effects of several parameters on the seismic soil structure interaction behaviour of midrise structures sitting on silty sandy soil. Using ABAQUS, reliable 3D models of 5 to 15 storeys midrise concrete frame structures rested on raft foundation were built. The effects of the structure’s number of storeys, raft size and thickness were explored for different column sizes. Fixed-based structures which capture the model adopted in seismic codes and flexible-based structures were hit at the bottom by El-Centro (1940) and Northridge (1994) earthquakes. Results and Conclusion: The results, presented in terms of storey lateral deflection, inter-storey drift, shear force, foundation rocking and response spectrum showed the important contribution of SSI effects on the behaviour of the midrise structures. The model analyses indicated that column size strongly affects the behaviour of flexible structures. Let N be the structure number of storeys and C the column size. The results showed that in terms of storey lateral deflection and levelling shear force, for column sizes C 0.5 X 0.5 m, SSI was detrimental to structures with 10 ≤ N ≤ 15 and beneficial to structures with 5 ≤ N <10. Increasing the column size to C 0.5 X 1 m showed that SSI became detrimental for structures with 10 < N ≤ 15 under El-Centro (1940) and for structures with 7≤ N ≤ 15 under Northridge (1994), and beneficial for structures with 5 ≤ N ≤ 10 under El-Centro (1940) and for structures with 5 ≤ N < 7 under Northridge (1994). The FE results showed that even though base shear increased with raft size, lateral deflections were amplified for C 0.5 X 0.5 m S15 structures and attenuated for C 0.5 X 1 m S15 structures. However, the seismic response of S15 structures was slightly affected by the variation in raft thickness under both column sizes. Finally, the paper includes a discussion and evaluation of the contribution of inertial and kinematic effects, including soil types used on the simulated numerical models’ seismic responses.

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