Advanced Steel Construction

Vol. 13, No. 4, pp. 361-377 (2017)


DYNAMIC SOIL-STRUCTURE INTERACTION OF DUCTILE STEEL

FRAMES IN SOFT SOILS

 

Edgar Tapia-Hernández1,*, Yesenia De Jesús-Martínez1 and Luciano Fernández Sola1

1Materials Department, Universidad Autónoma Metropolitana – Azcapotzalco. Mexico City.

*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 7 June 2016; Revised: 27 August 2016; Accepted: 26 October 2016

  

DOI:10.18057/IJASC.2017.13.4.3

 

ABSTRACT:

Results of static and dynamic nonlinear analysis of ductile steel frames of 8- and 12- stories buildings are discussed in this paper. The influence of dynamic soil-structure interaction in deformation demands, failure mechanism, ductility and overstrength capacities and maximum demands in columns were analyzed. For this purpose, buildings were designed and studied under three boundary conditions: (i) fixed-base (no Soil-Structure Interaction), (ii) pile foundation and (iii) mat foundation condition. The influence of the lateral stiffness was studied through the response of moment resisting frames (unbraced frames), 1-braced bay frames and 2-braced bays frames. Soil foundation dynamic stiffness (impedance function) is introduced by a set of springs in horizontal and rocking direction, which were computed from the dynamic behavior and properties of the soil-foundation system. It was found that fixed base model might not be a conservative representation of the response of buildings with flexible foundations, especially when a pile foundation system is considered.

 

Keywords:

Steel frames, inelastic analyses, pile foundation, mat foundation, soft soil

 

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