Seismic response of composite frames—I. Response criteria input motion

A currently populated slope in the northeast part of the city of Lima was selected as the target area of this study, with the aim of analyzing the influence of topography on its seismic response. A finite element model was constructed using soil information obtained by microtremor arraymeasurements conducted in flat and sloping areas, and solved for plain strain conditions in the time domain using an input motion developed for the most critical slip model of a simulation for megathrust earthquakes. Results showed that for this typical rocky slope, topographic effects do not have a significant influence on its seismic response, except for areas close to the foot of the slope where, even if soil vibration is restricted, an amplification of the seismic motion is still expected for short period structures.

Download Full-text

Effects of interface slip and semi-rigid joint on elastic seismic response of steel-concrete composite frames

Journal of Central South University of Technology ◽

10.1007/s11771-010-0638-6 ◽

2010 ◽

Vol 17 (6) ◽

pp. 1327-1335 ◽

Cited By ~ 6

Author(s):

Jing-jing Qi ◽

Li-zhong Jiang

Keyword(s):

Seismic Response ◽

Composite Frames ◽

Interface Slip

Download Full-text

Analysis of Site Response and Building Damage Distribution Induced by the 31 October 2002 Earthquake at San Giuliano di Puglia (Italy)

Earthquake Spectra ◽

10.1193/1.4000134 ◽

2013 ◽

Vol 29 (2) ◽

pp. 497-526 ◽

Cited By ~ 13

Author(s):

Rodolfo Puglia ◽

Marco Vona ◽

Peter Klin ◽

Chiara Ladina ◽

Angelo Masi ◽

...

Keyword(s):

Seismic Response ◽

Site Response ◽

Spectral Element ◽

Site Amplification ◽

Damage Distribution ◽

Numerical Predictions ◽

Definition Of ◽

Subsoil Model ◽

Molise Earthquake ◽

Input Motion

This paper concerns the analysis of the site amplification that significantly influenced the non-uniform damage distribution observed at San Giuliano di Puglia (Italy) after the 2002 Molise earthquake (MW = 5.7). In fact, the historical core of the town, settled on outcropping rock, received less damage than the more recent buildings, founded on a clayey subsoil. Comprehensive geotechnical and geophysical investigations allowed a detailed definition of the subsoil model. The seismic response of the subsoil was analyzed through 2-D finite-element and 3-D spectral-element methods. The accuracy of such models was verified by comparing the numerical predictions to the aftershocks recorded by a temporary seismic network. After calibration, the seismic response to a synthetic input motion reproducing the main shock was simulated. The influence of site amplification on the damage distribution observed was finally interpreted by combining the predicted variation of ground motion parameters with the structural vulnerability of the buildings.

Download Full-text

Effect of Elastomeric Snubber Properties on Seismic Response of Vibration-Isolated Mechanical Equipment: An Experimental Study

Earthquake Spectra ◽

10.1193/1.2923921 ◽

2008 ◽

Vol 24 (2) ◽

pp. 387-403 ◽

Cited By ~ 5

Author(s):

Saeed Fathali ◽

André Filiatrault

Keyword(s):

Seismic Response ◽

Contact Surface ◽

High Amplitude ◽

Relative Displacement ◽

Mechanical Equipment ◽

Gap Size ◽

Displacement Response ◽

Dynamic Forces ◽

Centrifugal Chiller ◽

Input Motion

Earthquake-simulator experiments were conducted on a liquid centrifugal chiller supported by four isolation/restraint systems with built-in elastomeric snubbers. The test plan incorporated variations of input motion amplitudes and snubber properties to investigate their effect on three response quantities: peak dynamic forces induced into the snubbers, peak acceleration, and peak relative displacement response of the equipment. The elastomeric snubbers limited the displacement responses of the vibration-isolated equipment at the expense of excessive dynamic forces and amplification of the equipment acceleration response. The snubber gap size was the most influential property on the response quantities. For high-amplitude input motions, all the response quantities increased with an increase of the gap size. Due to the compressibility of the snubber elastomeric contact-surface, the actual gap size was always larger than the nominal gap size. Even with a nominal gap size less than 0.25 in., the seismic response of the equipment was substantially different from the seismic response of rigidly mounted equipment. Compared to snubbers with constant contact-surface, snubbers with expanding contact-surface resulted in lower dynamic forces. The thicker and softer contact-surface could lower the dynamic forces induced into the snubbers but resulted in larger relative displacement response of the equipment.

Download Full-text

Elastic Seismic Response of Steel-Concrete Composite Frames with Partial Interaction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.268-270.729 ◽

2012 ◽

Vol 268-270 ◽

pp. 729-732

Author(s):

Jin Xi Duan ◽

Z. Shen

Keyword(s):

Boundary Condition ◽

Seismic Response ◽

Slip Boundary Condition ◽

Frame Structures ◽

Response Analysis ◽

Seismic Responses ◽

Shear Connection ◽

Slip Boundary ◽

Composite Frames ◽

Partial Interaction

The finite element formulations of steel-concrete composite (SCC) beams considering interlayer slip with end shear restraint is established. Elastic seismic response of SCC frame structures under different shear connection stiffness and slip boundary conditions are examined. The influences of the shear connection stiffness and the slip boundary condition on elastic seismic response are analyzed. With the shear connection stiffness increasing, the free vibration frequencies increase and the seismic responses decrease. The natural vibration properties of SCC frame structures and seismic responses are also significantly affected by the slip boundary condition, and it should be properly imposed on all composite beams in seismic response analysis.

Download Full-text