scholarly journals Evaluation of soil-structure interaction for structures subjected to earthquake loading with different types of foundation

2018 ◽  
Vol 162 ◽  
pp. 04026
Author(s):  
Mohammed Elwi ◽  
Bassman Muhammed ◽  
Nada Alhussiny
Keyword(s):  
Soil Structure ◽  
Response Spectrum ◽  
Soil Layer ◽  
Tall Buildings ◽  
Soil Structure Interaction ◽  
Soil Conditions ◽  
Building Frames ◽  
Structure Interaction ◽  
Different Types ◽  
Seismic Forces

However though the structures are supported on soil, most of the designers do not consider the soil structure interaction and its subsequent effect on structure during an earthquake. Different soil properties can affect seismic waves as they pass through a soil layer. When a structure is subjected to an earthquake excitation, it interacts the foundation and soil, and thus changes the motion of the ground. It means that the movement of the whole ground structure system is influenced by type of soil as well as by the type of structure. Tall buildings are supposed to be of engineered construction in sense that they might have been analyzed and designed to meet the provision of relevant codes of practice and building bye-laws. IS 1893: 2002 “Criteria for Earthquake Resistant Design of Structures” gives response spectrum for different types of soil such as hard, medium and soft. An attempt has been made in this paper to study the effect of Soil-structure interaction on multi storeyed buildings with various foundation systems. Also to study the response of buildings subjected to seismic forces with Rigid and Flexible foundations. Multi storeyed buildings with fixed and flexible support subjected to seismic forces were analyzed under different soil conditions like hard, medium and soft. The buildings were analyzed by Response spectrum method using software SAP2000. The response of building frames such as Lateral deflection, Story drift, Base shear, Axial force and Column moment values for all building frames were presented in this paper.

Analysis of Soil-Structure Interaction with Finite Element Method

2007 ◽  
Vol 340-341 ◽  
pp. 1279-1284 ◽  
Author(s):  
Hong Jian Liao ◽  
Jian Liu ◽  
Yan Gang Zhao ◽  
Zheng Hua Xiao
Keyword(s):  
Finite Element ◽  
Soil Structure ◽  
Response Spectrum ◽  
Soil Layer ◽  
Constitutive Relationship ◽  
Soil Structure Interaction ◽  
Element Analysis ◽  
Computer Technique ◽  
Structure Interaction ◽  
Viscous Boundary

Analysis of dynamic behavior of soil-structure interaction (SSI) is a complicated problem due to the complexities of soil behaviors and dynamic analysis. It is difficult to solve SSI with analytical methods. However, numerical methods with highly developed computer technique are efficient. Based on the advanced nonlinear finite element analysis software MSC.Marc, SSI on loess ground is studied. An approach for the application of MSC.Marc in SSI analysis is presented and an example is given. Hyperbolic soil constitutive relationship and viscous boundary conditions are adopted in the soil model. Moreover, contact between the embedded columns and the adjacent soil is considered. Response spectrum analysis of the result is carried out. Some conclusions about the seismic response of soil-structure system under different soil stiffness and different soil-layer thickness conditions are given. A new way of analyzing SSI for loess ground is provided.

scholarly journals SOIL-RAFT FOUNDATION-STRUCTURE INTERACTION EFFECTS ON SEISMIC PERFORMANCE OF MULTI-STORY MRF BUILDINGS

2014 ◽  
Vol 6 (2) ◽  
pp. 43-61 ◽  
Author(s):  
Shehata E. Abdel Raheem ◽  
Mohamed M. Ahmed ◽  
Tarek M. A. Alazrak
Keyword(s):  
Seismic Response ◽  
Soil Structure ◽  
Response Spectrum ◽  
Design Procedure ◽  
Time History ◽  
Soil Structure Interaction ◽  
Soil Conditions ◽  
Fe Model ◽  
Structure Interaction ◽  
Raft Foundation

Recent studies show that the effects of Soil Structure Interaction (SSI) may be detrimental to the seismic response of structure and neglecting SSI in analysis may lead to un-conservative design. Despite this, the conventional design procedure usually involves assumption of fixity at the base of foundation neglecting the flexibility of the foundation, the compressibility of soil mass and consequently the effect of foundation settlement on further redistribution of bending moment and shear force demands. The effects of SSI are analyzed for typical multi-story building resting on raft foundation. Three methods of analysis are used for seismic demands evaluation of the target moment resistant frame buildings: equivalent static load (ESL); response spectrum (RS) methods and nonlinear time history (TH) analysis with suit of nine time history records. Three-dimensional Finite Element (FE) model is constructed to analyze the effects of different soil conditions and number of stories on the vibration characteristics and seismic response demands of building structures. Numerical results obtained using soil structure interaction model conditions are compared to those corresponding to fixed-base support conditions. The peak responses of story shear, story moment, story displacement, story drift, moments at beam ends, as well as force of inner columns are analyzed.

scholarly journals Effects of Soil on the Seismic Design of Long Span Steel Frames Using Contemporary Building Codes

2020 ◽  
Vol 18 (02) ◽  
pp. 1-10
Author(s):  
Muhammad Tayyab Naqash ◽  
Qazi Umar Farooq
Keyword(s):  
Soil Structure ◽  
Response Spectrum ◽  
Building Codes ◽  
Soil Structure Interaction ◽  
Soil Stiffness ◽  
Structure Interaction ◽  
Long Span ◽  
Moment Resisting ◽  
The Moment ◽  
Seismic Forces

Seismic excitations and other lateral dynamic distress cause the structure’s foundation to interact with the superstructure’s response. Consequently, the surplus stress distribution takes place. This disturbance in the lateral stiffness of the system can cause un-satisfaction with the adopted code provisions. In the above scenario, soil structure interaction of the Moment Resisting Frames (MRFs) becomes very crucial. This article deals with soil stiffness on the long-span MRFs designed with two modern building codes, namely Saudi Building Code (based on American Standards) and Eurocodes. High and medium ductility with parameter and spatial frame configurations are considered in this study. Each frame is analysed considering the foundation stiffness, calculated based on FEMA recommendations. Hence, a total of 18 cases are examined, conducting a modal response spectrum analysis. The period, top displacements, reactions, and damageability criterion for the analyzed frames are compared. It is shown that the consideration of SSI (Soil Structure Interaction) is paramount for frames with such spans, especially when subjected to high seismic forces.

Effect of Pile-Soil-Structure Interaction on the Cable-Stayed Bridge in Response to the Earthquake

2014 ◽  
Vol 539 ◽  
pp. 731-735 ◽  
Author(s):  
Yu Chen
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Soil Structure ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Three Dimensional Finite Element

In this thesis, based on the design of a 140+90m span unusual single tower and single cable plane cable-stayed bridge, free vibration characteristics and seismic response are investigated; three dimensional finite element models of a single tower cable-stayed bridge with and without the pile-soil-structure interaction are established respectively by utilizing finite element software MIDAS/CIVIL, seismic response of Response spectrum and Earthquake schedule are analyzed respectively and compared. By the comparison of the data analysis, for small stiffness span cable-stayed bridge, the pile-soil-structure interaction can not be ignored with calculation and analysis of seismic response.

A Study on the Embedment Effect in the Soil-Structure Interaction Analysis of the APR1400

2002 ◽  
Author(s):  
Young-Sun Jang ◽  
Kwang-Ho Joo ◽  
Chong-Hak Kim
Keyword(s):  
Nuclear Power ◽  
Soil Structure ◽  
Interaction Analysis ◽  
Response Spectra ◽  
Soil Structure Interaction ◽  
Soil Conditions ◽  
Structure Interaction ◽  
Structure Response ◽  
Parametric Analyses ◽  
Volume Method

The SSI (Soil-Structure Interaction) analyses are being performed for the APR1400 (Advanced Power Reactor 1400MWe, Old name - KNGR ; Korean Next Generation Reactor) design, because the APR1400 is developed as a Standard Nuclear Power Plant concept enveloping suitable soil conditions. For the SSI analyses, SASSI program which adopts the Flexible Volume Method is used. In the SSI analyses, there can be uncertainties by Bond and De-bond problem between the structure and lateral soil elements. According to ASCE Standard 4, one method to address this concern is to assume no connectivity between structure and lateral soil over the upper half of the embedment of 20ft (6m), whichever is less. This study is performed as a part of the parametric analyses for the APR1400 seismic analyses to address the concern of the potential embedment effect on the in-structure response spectra due to connectivity between structure and lateral soil. In this study, 4 model cases are analyzed to check the potential embedment effect — Full connection, 20ft no connectivity which is defined as a minimum De-bond depth of the soil in ASCE Standard 4 and 26.5ft no connectivity between structure and lateral soil over the upper half of the embedment. Last one is full no connection for only reference. The in-structure response spectra are compared with the response spectra without considering the embedment effect.

Seismic Soil-Structure Interaction Response of Tall Buildings

2019 ◽  
Author(s):  
Jaime A. Mercado ◽  
Luis G. Arboleda-Monsalve ◽  
Vesna Terzic
Keyword(s):  
Soil Structure ◽  
Tall Buildings ◽  
Soil Structure Interaction ◽  
Structure Interaction
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