New insight into and simplified approach to seismic analysis of torsionally coupled one-story, elastic systems

2005 ◽  
Vol 286 (1-2) ◽  
pp. 265-312 ◽  
Author(s):  
T.L. Trombetti ◽  
J.P. Conte
Keyword(s):  
Seismic Analysis ◽  
Simplified Approach ◽  
Elastic Systems ◽  
Insight Into

ThunderSeis: Seismic analysis of thunder signals recorded at the Gaisberg mountain, Austria

2021 ◽  
Author(s):  
Artemii Novoselov ◽  
Florian Fuchs ◽  
Manfred Dorninger ◽  
Goetz Bokelmann
Keyword(s):  
Seismic Analysis ◽  
Meteorological Station ◽  
Lightning Stroke ◽  
Seismic Sensors ◽  
Insight Into ◽  
Important Milestone

<p>Lightning strokes create powerful wavefields of seismoacoustic nature, which we refer to as thunder. Unfortunately, even though bolts of lightning received much attention in such fields as physics of plasma and meteorology, less research was conducted to investigate the thunder itself.<br><br>A radio tower on the top of the Gaisberg mountain in Salzburg is permanently instrumented with electrical sensors able to record the current of lightning strokes hitting the tower’s top. In October 2020, observations of 5 thunder signals have been made using several one-component seismic sensors. At the same time, this tower is instrumented with a meteorological station, which allows us to model precisely the propagation of seismo-acoustic thunder signals from the above-mentioned lightnings.<br><br>These observations and modeling give insight into how thunder is created during the lightning stroke, which is an important milestone for seismo-acoustic observations of atmospheric events.</p>

scholarly journals Proposed Simplified Approach for the Seismic Analysis of Multi-Storey Moment Resisting Framed Buildings Incorporating Friction Sliders

Buildings ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 130 ◽  
Author(s):  
Shahab Ramhormozian ◽  
G. Charles Clifton ◽  
Massimo Latour ◽  
Gregory A. MacRae
Keyword(s):  
Seismic Analysis ◽  
Time History ◽  
Point Of View ◽  
Friction Damper ◽  
Simplified Approach ◽  
Analysis And Design ◽  
Residual Drift ◽  
Moment Resisting ◽  
Design Earthquake ◽  
Column Base

An innovative, simplified, and accurate model is proposed and developed to enable simplified yet realistic time history analysis of multi-storey buildings with moment resisting connections using friction energy dissipaters in the commonly used structural analysis and design program, SAP2000. The analyses are rapid to undertake, thereby enabling detailed study of the influence of many building system effects on the overall response. This paper presents the outcome of dynamic analysis of a complete 13-storey moment resisting steel building with Sliding Hinge Joints as the beam-column connections, considering the influential self-centring factors such as MRF and gravity columns continuity as well as column base and diaphragm flexibilities. The building is one of the Te-Puni towers, which are structural steel apartment buildings with steel-concrete composite floors, designed according to the low damage design philosophy, built in Wellington, New Zealand in 2008 and which have already been subjected to two significant earthquakes. The key objectives of the research have been to take the design of the 13-storey building and convert that into the proposed simplified model required for time history seismic analysis, to undertake analysis under scaled El-Centro earthquake record, investigate the peak inter-storey drift and the residual drift of the building, and determine the influence of column base rotational stiffness, floor slab out of horizontal plane displacement, type of friction damper, and MRF and gravity column continuity. It is concluded that the response of the building is stable and predictable, as expected, and that the post-earthquake state of the building, particularly from the self-centring point of view, is well within the limits for maintaining operational continuity following an ULS level design earthquake.

Decoupling Method of Sloshing Water in PCCWST of Large-Scale Advanced Passive PWR Nuclear Power Plant

2017 ◽  
Author(s):  
Boyu Han ◽  
Fang Yuan ◽  
Zufeng Xia ◽  
Honghui Ge ◽  
Shenghua Liu ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Large Scale ◽  
Seismic Analysis ◽  
Water Storage ◽  
Cooling Water ◽  
Fluid Element ◽  
Decoupling Method ◽  
Simplified Approach ◽  
Water Storage Tank ◽  
The One

Modeling water in passive containment cooling water storage tank (PCCWST) using fluid element will result in large amount of calculation when conducting seismic analysis of shield building or NI. Thus, it is necessary to simplify the modal of water so as to reduce the difficulty of seismic analysis under condition that the error is slight enough to be ignored. By formula deduction and analysis, on the one hand, this paper proofs that modeling “sloshing mass” as fixed mass on structure is unreasonable. On the other hand, this paper proposes that the reasonable simplified approach is to decouple “sloshing mass” totally from the structure system. Furthermore, conditions of utilizing decoupling method are illustrated.

READING DIODORUS 18.9.3 AND ΜΕΤΑ ΠΟΛΛΗΣ ΗΣΥΧΙΑΣ

2017 ◽  
Vol 63 ◽  
pp. 167-176
Author(s):  
John Walsh
Keyword(s):  
Valuable Insight ◽  
Intended Meaning ◽  
Simplified Approach ◽  
Insight Into

Because Diodorus’Bibliothēkēwas written as an epitome, it has been common practice to conduct a compartmentalised study of his work. One of the results of this overly simplified approach has been to segregate passages from the rest of the narrative, such as 18.9.3 where Leosthenes recruits mercenaries for the Lamian War. As a result, the intended meaning of the crucial phrase μετὰ πολλῆς ἡσυχίας has been missed and valuable insight into the event is overlooked. This paper argues that μετὰ πολλῆς ἡσυχίας in Diod. 18.9.3 means ‘without great urgency’, not, as some have interpreted it, as ‘very quietly’ or ‘secretly’.

Simplified approach for the seismic analysis of precast girder bridges with gap

2021 ◽  
Author(s):  
E. F. Ayoub ◽  
M. Youakim ◽  
P. Nady
Keyword(s):  
Seismic Analysis ◽  
Linear Time ◽  
Response Spectrum ◽  
Time History ◽  
Relative Displacement ◽  
Seismic Effect ◽  
Base Shear ◽  
Simplified Approach ◽  
Elastomeric Bearing ◽  
Girder Bridges

<p>Precast girder bridges are very attractive structural systems to bridge engineers due to their construction rapidity. In their deck arrangement a gap is introduced between the precast girders and the inverted pier cross head. Under longitudinal seismic effect the gap can be closed and the superstructure movement will be locked by the web of the pier cross-head. Usually a rigorous and sensitive non-linear time history analysis will be required for this type of structures. In this paper, a simplified approach will be introduced to estimate the base shear force transmitted to the bridge substructure under seismic loading. In the present approach the modelling of the elastomeric bearing element stiffness is modified in such a way that under earthquake loading the relative displacement between top level and bottom level of bearing equals to the gap value. The seismic analysis with slight, moderate and sharp earthquake accelerations is performed based on the response spectrum analysis as presented by AASHTO LRFD.</p>

scholarly journals Bathymetry and Shallow Seismic Imaging of the 2018 Flank Collapse of Anak Krakatau

2021 ◽  
Vol 8 ◽  
Author(s):  
Wisnu S. Priyanto ◽  
James E. Hunt ◽  
Muhammad Hanif ◽  
David R. Tappin ◽  
Haryadi Permana ◽  
...  
Keyword(s):  
Seismic Data ◽  
Seismic Analysis ◽  
Deposit Morphology ◽  
Critical Stability ◽  
Seafloor Morphology ◽  
Flank Collapse ◽  
Shallow Seismic ◽  
Emplacement Processes ◽  
Insight Into ◽  
Landslide Deposit

The flank failure and collapse of Anak Krakatau on December 22nd, 2018 triggered a destructive tsunami. Whether the prior activity of the volcano led to this collapse, or it was triggered by another means, remains a challenge to understand. This study seeks to investigate the recent volcano submarine mass-landslide deposit and emplacement processes, including the seafloor morphology of the flank collapse and the landslide deposit extent. Bathymetry and sparker seismic data were used during this study. Bathymetry data collected in August, 2019 shows the run-out area and the seafloor landslide deposit morphology. Bathymetry data acquired in May, 2017, is used as the base limit of the collapse to estimate the volume of the flank collapse. Comparisons between seismic data acquired in 2017 and 2019 provide an insight into the landslide emplacement processes, the deposit sequence, and structure below the seafloor. From these results we highlight two areas of the submarine-mass landslide deposit, one proximal to Anak Krakatau island (∼1.6 km) and one distal (∼1.4 km). The resulting analysis suggests that the submarine-mass landslide deposit might be produced by a frontally compressional, faulted, landslide, triggered by the critical stability slope, and due to the recent volcanic activity. Blocky seabed features clearly lie to the southwest of Anak Krakatau, and may represent the collapse blocks of the landslide. The seismic analysis of the data acquired in August, 2019 reveals that the blocky facies extends to ∼1.62 km in the width around Anak Krakatau, and the block thicknesses vary up to 70.4 m. The marine data provides a new insight into the landslide run out and extent, together with the landslide deposit morphology and structure that are not available from satellite imagery or subaerial surveys. We conclude that the landslide run out area southwest of the recent collapse, is ∼7.02 ± 0.21 km2.

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