scholarly journals IMPACTS OF TRANSVERSE EARTHQUAKES ON SEISMIC RESPONSE OF BRIDGES WITH ROCKING FOUNDATIONS AND VARIOUS SHEAR KEYS

2020 ◽  
Author(s):  
OMAR EL-HAWAT ◽  
BEHZAD FATAHI ◽  
AMIR A. MOSAVI
Keyword(s):  
Seismic Response ◽  
Shear Keys ◽  
Rocking Foundations

Seismic Performance of Sacrificial Exterior Shear Keys in Bridge Abutments

2009 ◽  
Vol 25 (3) ◽  
pp. 643-664 ◽  
Author(s):  
Pedro F. Silva ◽  
Sami Megally ◽  
Frieder Seible
Keyword(s):  
Performance Evaluation ◽  
Seismic Response ◽  
Seismic Loading ◽  
Experimental Results ◽  
Peak Performance ◽  
Cyclic Loads ◽  
Hysteretic Model ◽  
Bridge Abutments ◽  
Deformation Response ◽  
Shear Keys

Performance evaluation of sacrificial exterior shear keys in bridge abutments under simulated seismic loading was conducted in terms of damage levels that were observed during testing. These experiments provided results that were used to make realistic assumptions on the load-deformation response of as-built sacrificial exterior shear keys as well as their peak and post-peak performance under cyclic loads. Experimental results were subsequently used to develop a two-spring component hysteretic model for modeling the seismic response of shear keys at the abutments. The mathematical rules used to describe the hysteretic model are presented. Analyses show that this model was able to reproduce reasonably well the cyclic response of the investigated keys. The hysteretic model and key experimental results are presented in this paper.

scholarly journals Three-Dimensional Nonlinear Seismic Response of Immersed Tunnel in Horizontally Layered Site under Obliquely Incident SV Waves

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
Xiaojie Zhou ◽  
Qinghua Liang ◽  
Yueyu Zhang ◽  
Zhongxian Liu ◽  
Ying He
Keyword(s):  
Seismic Response ◽  
Seismic Waves ◽  
Dynamic Stiffness ◽  
Soil Layer ◽  
Three Dimensional ◽  
Equivalent Linearization ◽  
Nonlinear Seismic Response ◽  
Obliquely Incident ◽  
Immersed Tunnel ◽  
Shear Keys

A three-dimensional (3D) detailed numerical model of an immersed tunnel in a horizontally layered site is established in this study. The 3D seismic response of the immersed tunnel in a horizontally layered site subjected to obliquely incident waves is analyzed based on the precise dynamic stiffness matrix of the soil layer and half-space via combined viscous-spring boundary and equivalent node stress methods. The nonlinear effects of external and internal site conditions on the whole model were determined by equivalent linearization algorithm and Mohr–Coulomb model, respectively. The proposed model was then applied to investigate the nonlinear seismic response of an immersed tunnel in the Haihe River subjected to seismic waves of oblique incidence. The dislocation (opening) of pipe joints in the immersed tunnel were analyzed to determine the response characteristics of the shear keys and overall displacement of the tunnel; the dynamic responses of the immersed tunnel subjected to obliquely incident seismic waves markedly differ from those of vertically incident seismic SV waves. The maximum stress value of shear keys and the maximum dislocation of the pipe joint appear as upon critical angle. The overall displacement of the tunnel increases as incident angle increases. Under severe earthquake conditions, both the pipe corners and midspan section of the roof and floor are likely to produce crack. These areas need careful consideration in the seismic design of immersed tunnel structures.

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

Sign in / Sign up

Export Citation Format

Share Document