Ground Motions and Deformations Associated with Earthquake Faulting and Their Effects on the Safety of Engineering Structures

2012 ◽  
Keyword(s):  
Ground Motions ◽  
Engineering Structures ◽  
Earthquake Faulting

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

2021 ◽  
pp. 136943322110561
Author(s):  
Arsam Taslimi ◽  
Mohsen Tehranizadeh
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Fragility Curves ◽  
Ground Motions ◽  
Reinforced Concrete Frame ◽  
Engineering Structures ◽  
Intensity Measures ◽  
Vertical Excitation ◽  
High Rise ◽  
Wall Structures

According to the observations of past earthquakes, the vertical ground motions have had a striking influence on the engineering structures, especially reinforced concrete ones. Nevertheless, the number of studies on their aftermath is insufficient, and despite some endeavors done by researchers, there is still a shortage of knowledge about the inclusion of vertical excitation on the seismic performance and the collapse probability of RC buildings. Hence, the variation in the collapse risk of three high-rise RC frame-core wall structures when they undergo bi-directional ground motions is discussed. In this paper, incremental dynamic analyses are carried out under two circumstances, including the horizontal (H) and the combined horizontal and vertical (H+V) earthquakes, and the seismic fragility curves are derived. The inter-story drift ratio corresponding to the onset of collapse has also been defined. The buildings collapse risk under the two circumstances is obtained from the risk integral. Results indicate that in the H+V state, structures meet the collapse criteria for lower intensity measures. Thus, the collapse risk increases as the structures are subjected to bi-directional seismic loads, and the consideration of this effect leads to a more accurate evaluation of buildings seismic performance.

Investigation on Damage-Involved Structural Response of Colliding Steel Structures during Ground Motions

2016 ◽  
Vol 713 ◽  
pp. 26-29 ◽  
Author(s):  
Barbara Sołtysik ◽  
Tomasz Falborski ◽  
Robert Jankowski
Keyword(s):  
Dynamic Properties ◽  
Ground Motions ◽  
Structural Response ◽  
Steel Structures ◽  
Separation Distance ◽  
Shaking Table ◽  
Engineering Structures ◽  
Positive Role ◽  
Acceleration Time Histories ◽  
Adjacent Structures

Earthquakes are the most unpredictable damaging loads which can affect civil engineering structures. Due to insufficient separation distance between adjacent structures with different dynamic properties, structural collisions may occur during ground motions. Although the research on structural pounding has recently been much advanced, the studies have mainly been conducted for concrete structures. The aim of this paper is to show the results of experimental investigation, focused on dynamic behaviour of closely-separated three models of steel structures which have been subjected to damaging earthquake excitations. The study was performed using three models of steel towers with different dynamic parameters and various distances between the structures. The acceleration time histories of the Kobe and the Northridge earthquakes were applied as the seismic excitation. The unidirectional shaking table, located at the Gdansk University of Technology (Poland), was used in the experimental study. The results have confirmed that collisions may lead to the increase in the structural response, although they may also play a positive role, depending on the size of the separation gap between the structures.

scholarly journals Damage to civil engineering structures due to the near Izu-Ohshima earthquake of January 14, 1978

1979 ◽  
Vol 12 (2) ◽  
pp. 127-135
Author(s):  
Toshio Iwasaki ◽  
Kazuhiko Kawashima
Keyword(s):  
Civil Engineering ◽  
Ground Motions ◽  
Middle Part ◽  
Public Works ◽  
Engineering Structures ◽  
The Public ◽  
Izu Peninsula ◽  
Field Investigations ◽  
Richter Scale ◽  
Civil Engineering Structures

A severe earthquake hit the middle part of Izu Peninsula on January
 14, 1973, registering a magnitude of 7.0 on the Richter scale. The
 Public Works Research Institute the Ministry of Construction has conducted field investigations on damages to engineering structures, such as highways, tunnels, bridges immediately after the outbreak of the earthquake. This paper describes the results of investigations of the earthquake damage, and includes (1) outline of the earthquake, (2) topography and geology of Izu Peninsula, (3) earthquake ground motions, (4) damage statistics, (5) damages to civil engineering structures, and closing remarks.

Effects of Earthquake Faulting on Civil Engineering Structures

2018 ◽  
Vol 12 (04) ◽  
pp. 1841007
Author(s):  
Ömer Aydan ◽  
Nasir Zia Nasiry ◽  
Yoshimi Ohta ◽  
Reşat Ulusay
Keyword(s):  
Ground Deformation ◽  
Permanent Deformation ◽  
Engineering Structures ◽  
Ground Shaking ◽  
Thrust Faulting ◽  
Earthquake Faulting ◽  
Surface Ruptures ◽  
Motion Characteristics ◽  
Permanent Ground Deformation ◽  
Model Structures

Ground motion characteristics, deformation and surface breaks of earthquakes depend upon the causative faults. Their effects on the seismic design of engineering structures are almost not considered in the present codes of design although there are attempts to include in some countries (i.e. USA, Japan, Taiwan, and Turkey). In this study, the authors first describe ground motions, crustal deformation and surface break observations caused by earthquakes having different faulting mechanism. Then some laboratory experiments were carried out to simulate the motions during normal and thrust faulting and their effects on model structures. And then, the effects of surface ruptures and deformations due to earthquake faulting on the response and stability engineering structures through observations in recent great earthquakes are presented. Finally, some recommendations for the design of structures with the consideration of permanent ground deformation in addition to ground shaking, which may be used in the development of seismic codes incorporating the effect of permanent deformation on structures, are proposed.

Influence of site effects and period-dependent force modification factors on the seismic response of ductile structures

1994 ◽  
Vol 21 (4) ◽  
pp. 596-604 ◽  
Author(s):  
Shamel Hosni ◽  
Arthur C. Heidebrecht
Keyword(s):  
Seismic Response ◽  
Site Effects ◽  
Ground Motions ◽  
Code Design ◽  
Base Shear ◽  
Engineering Structures ◽  
Local Soil ◽  
Short Period ◽  
Modification Factor ◽  
Ductility Capacity

A foundation factor, F, is incorporated in the National Building Code of Canada (NBCC) design base shear formula to account for amplification of bedrock ground motions as these propagate upwards through the local soil deposit (site effects). In the NBCC, the value of F is specified as a function of the local soil type and depth, irrespective of the ductility capacity for which the structure situated at the surface of the soil deposit is to be designed and detailed. On the other hand, the ductility capacity of the structures is taken into account in the code by the force modification factor, R, for which values are specified depending on the type of the structural system. The current study investigates the influence of the ductility capacity of engineering structures in mitigating the site effects. Simple bilinear single-degree-of-freedom models are used to simulate the seismic response of structures, underlain by soft or stiff soil deposits and subjected to seismic ground motions. These structural models are also used to investigate the effects of the period-dependent force modification factors on the seismic response of structures.The results show that site effects are less significant for ductile structures, as compared with structures that respond elastically. The results are then used to evaluate the current code provisions for site effects. The current study also shows that using period-dependent force modification factors to derive the code design base shear not only is recommended for short period structures but also is necessary to provide a realistic simulation of the seismic response of these structures. Key words: site, seismic, ductility, structure, foundation, factor, base, shear, amplification, soil, period.

Sign in / Sign up

Export Citation Format

Share Document