Determination of Non-uniform Input Ground Motion for High Concrete Face Rockfill Dams

2020 ◽  
pp. 136-145
Author(s):  
Yu Yao ◽  
Rui Wang ◽  
Tianyun Liu ◽  
Jian-Min Zhang
Keyword(s):  
Ground Motion ◽  
Concrete Face

Concurrent Design Forces in Structures under Three-Component Orthotropic Seismic Excitation

2002 ◽  
Vol 18 (1) ◽  
pp. 1-17 ◽  
Author(s):  
K. Anastassiadis ◽  
I. E. Avramidis ◽  
P. Panetsos
Keyword(s):  
Ground Motion ◽  
Design Procedure ◽  
Strong Motion ◽  
Response Spectra ◽  
Concurrent Design ◽  
Motion Model ◽  
Specific Point ◽  
Extreme Stress ◽  
Seismic Motion

According to the model of Penzien and Watabe, the three translational ground motion components on a specific point of the ground are statistically noncorrelated along a well-defined orthogonal system of axes p, w, and v, whose orientation remains reasonably stable over time during the strong motion phase of an earthquake. This orthotropic ground motion is described by three generally independent response spectra Sa, Sb, and Sc, respectively. The paper presents an antiseismic design procedure for structures according to the above seismic motion model. This design includes a) determination of the critical orientation of the seismic input, i.e., the orientation that gives the largest response, b) calculation of the maximum and the minimum values of any response quantity, and c) application of either the Extreme Stress Method or the Extreme Force Method for determining the most unfavorable combinations of several stress resultants (or sectional forces) acting concurrently at a specified section of a structural member.

scholarly journals Earthquakes on the surface: earthquake location and area based on more than 14 500 ShakeMaps

2018 ◽  
Vol 18 (6) ◽  
pp. 1665-1679
Author(s):  
Stephanie Lackner
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Earthquake Location ◽  
Primary Concern ◽  
Ground Acceleration ◽  
Ground Shaking ◽  
Geographic Context ◽  
The Social ◽  
Strong Ground

Abstract. Earthquake impact is an inherently interdisciplinary topic that receives attention from many disciplines. The natural hazard of strong ground motion is the reason why earthquakes are of interest to more than just seismologists. However, earthquake shaking data often receive too little attention by the general public and impact research in the social sciences. The vocabulary used to discuss earthquakes has mostly evolved within and for the discipline of seismology. Discussions on earthquakes outside of seismology thus often use suboptimal concepts that are not of primary concern. This study provides new theoretic concepts as well as novel quantitative data analysis based on shaking data. A dataset of relevant global earthquake ground shaking from 1960 to 2016 based on USGS ShakeMap data has been constructed and applied to the determination of past ground shaking worldwide. Two new definitions of earthquake location (the shaking center and the shaking centroid) based on ground motion parameters are introduced and compared to the epicenter. These definitions are intended to facilitate a translation of the concept of earthquake location from a seismology context to a geographic context. Furthermore, the first global quantitative analysis on the size of the area that is on average exposed to strong ground motion – measured by peak ground acceleration (PGA) – is provided.

A Comparative Investigation of Structural Performance of Typical and Non-Ducitle Public RC Buildings Strengthened Using Friction Dampers and RC Walls

2017 ◽  
pp. 112-127 ◽  
Author(s):  
Erkan Akpinar ◽  
Seckin Ersin
Keyword(s):  
Ground Motion ◽  
Comparative Investigation ◽  
Rc Buildings ◽  
Post Intervention ◽  
Friction Dampers ◽  
History Analysis ◽  
Response History Analysis ◽  
Nonlinear Static ◽  
Selection Of

Strengthening of non-ductile public buildings is a never-ending issue. Selection of the suitable strengthening method and appropriate analysis type for the assessment of pre- and the post-intervention performances are still open to question. The displacement or drift limitations are crucial as well as demand capacity ratios for determination of such buildings performance under severe ground motion. In this chapter, an investigation of seismic performance focused on displacement criterion of strengthened non-ductile public RC buildings in Turkey is presented. Both the nonlinear static and response history analysis were conducted. Friction dampers which are fairly modern technique and conventional RC wall implementation method were introduced to as-is building. For the simplicity and the easy of the process, 2D frame selected for investigation. Comparison of the aforementioned techniques for non-ductile public RC buildings and performances particularly by means of displacement obtained using different methods for those investigated schemes are carried out and presented in the chapter.

A Comparative Investigation of Structural Performance of Typical and Non-Ducitle Public RC Buildings Strengthened Using Friction Dampers and RC Walls

2019 ◽  
pp. 1073-1089
Author(s):  
Erkan Akpinar ◽  
Seckin Ersin
Keyword(s):  
Ground Motion ◽  
Comparative Investigation ◽  
Rc Buildings ◽  
Post Intervention ◽  
Friction Dampers ◽  
History Analysis ◽  
Response History Analysis ◽  
Nonlinear Static ◽  
Selection Of

Strengthening of non-ductile public buildings is a never-ending issue. Selection of the suitable strengthening method and appropriate analysis type for the assessment of pre- and the post-intervention performances are still open to question. The displacement or drift limitations are crucial as well as demand capacity ratios for determination of such buildings performance under severe ground motion. In this chapter, an investigation of seismic performance focused on displacement criterion of strengthened non-ductile public RC buildings in Turkey is presented. Both the nonlinear static and response history analysis were conducted. Friction dampers which are fairly modern technique and conventional RC wall implementation method were introduced to as-is building. For the simplicity and the easy of the process, 2D frame selected for investigation. Comparison of the aforementioned techniques for non-ductile public RC buildings and performances particularly by means of displacement obtained using different methods for those investigated schemes are carried out and presented in the chapter.

scholarly journals Determination of Peak Impact Force for Buildings Exposed to Structural Pounding during Earthquakes

Geosciences ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 18 ◽  
Author(s):  
Seyed Mohammad Khatami ◽  
Hosein Naderpour ◽  
Rui Carneiro Barros ◽  
Anna Jakubczyk-Gałczyńska ◽  
Robert Jankowski
Keyword(s):  
Ground Motion ◽  
Parametric Study ◽  
Structural Damage ◽  
Impact Force ◽  
Structural Parameters ◽  
Seismic Excitations ◽  
Ground Acceleration ◽  
Structural Pounding ◽  
Peak Impact Force

Structural pounding between adjacent, insufficiently separated buildings, or bridge segments, has been repeatedly observed during seismic excitations. Such earthquake-induced collisions may cause severe structural damage or even lead to the collapse of colliding structures. The aim of the present paper was to show the results of the study focused on determination of peak impact forces during collisions between buildings exposed to different seismic excitations. A set of different ground motion records, with various peak ground acceleration (PGA) values and frequency contents, were considered. First, pounding-involved numerical analysis was conducted for the basic parameters of colliding buildings. Then, the parametric study was carried out for different structural natural periods, structural damping ratios, gap sizes between buildings and coefficients of restitution. The results of the analysis conducted for the basic structural parameters indicate that the largest response of the analysed buildings was observed for the Duzce earthquake. The parametric study showed that the pounding-involved structural response depended substantially on all parameters considered in the analysis, and the largest response was observed for different ground motions. The results of the study presented in this paper indicate that the value of the peak impact force expected during the time of the earthquake does not depend on the PGA value of ground motion, but rather on the frequency contents of excitation and pounding scenario. It is therefore recommended that the peak impact force for buildings exposed to structural pounding during earthquakes should be determined individually for the specific structural configuration taking into account the design ground motion.

THE APPLICATION OF VARIOUS GEOPHYSICAL TECHNIQUES TO SPECIALIZED ENGINEERING PROJECTS

Geophysics ◽  
1962 ◽  
Vol 27 (2) ◽  
pp. 221-236 ◽  
Author(s):  
William T. McGuinness ◽  
Walter C. Beckmann ◽  
Charles B. Officer
Keyword(s):  
Ground Motion ◽  
Civil Engineering ◽  
Environmental Studies ◽  
Site Investigations ◽  
Seismic Methods ◽  
Geophysical Techniques ◽  
Marine Site ◽  
Engineering Projects

Sonic and seismic methods applied to marine and land civil engineering projects and several unique techniques applied to specialized problems encountered in engineering are described. The geophysical techniques discussed include Sparker and Gas Exploder surveys for marine site investigations, measurements of ground motion for quiet instrument facilities, undersea cable environmental studies, and in situ determination of pile lengths.

Calibration of electromagnetic seismographs satisfying galitzin conditions

1961 ◽  
Vol 51 (1) ◽  
pp. 111-125
Author(s):  
S. K. Chakrabarty ◽  
A. N. Tandon
Keyword(s):  
Ground Motion ◽  
Precision Measurements ◽  
Routine Test ◽  
Valuable Data ◽  
Sudden Impulse ◽  
Precise Estimation ◽  
The World ◽  
Seismological Observatory ◽  
Theoretical Results

Abstract A large number of electromagnetic seismographs are now in operation at the different stations of the world network of seismological observatories and valuable data have been collected through them. Various attempts have earlier been made for the precise estimation of the instrumental constants as well as the magnification curves, but such estimations were not precise either due to approximations introduced in the analysis or due to difficulties of precision measurements during the experiments suggested for the determination of some of the instrumental constants. In the present paper theoretical results have been given for the response of the seismographs to different tests required in the calibration of the electromagnetic seismographs, and also to sinusoidal ground motion. The “reaction of the seismometer and galvanometer” has been retained. Final results have also been given for the special types of seismographs in which the seismometer period and galvanometer period are equal and the galvanometer is critically damped. The variation of the magnification curve as well as that of the response to different tests, with changes in the reaction and seismometer damping, have been obtained. Methods have been indicated by which the instrumental constants can be determined and the seismographs can be adjusted to any prescribed condition. The results of calibration of a Sprengnether seismograph in operation at the Central Seismological Observatory, Shillong have been given. The methods suggested can also be used in the precise estimation of the instrumental constants and the magnification of seismographs of the Galitzin type even in their past operating condition, if the routine test data, particularly the response to tapping test and sudden impulse test are available.

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