Seismic performance of steel structures retrofitted with optimal slack cable collapse prevention system

2020 ◽  
Vol 31 ◽  
pp. 101392
Author(s):  
A. Kaveh ◽  
A. Dadras Eslamlou ◽  
R. Sheikhi
Keyword(s):  
Seismic Performance ◽  
Steel Structures ◽  
Collapse Prevention ◽  
Prevention System

Effect on buckling behavior and seismic performance of steel piers corrosion-damaged near ground

2021 ◽  
Author(s):  
Takuma Rokutani ◽  
Kazutoshi Nagata ◽  
Takeshi Kitahara
Keyword(s):  
Seismic Performance ◽  
Rectangular Cross Section ◽  
Steel Structures ◽  
Corrosion Damage ◽  
Bridge Piers ◽  
Response Analysis ◽  
Steel Bridge ◽  
Seismic Response Analysis ◽  
Economic Miracle ◽  
Buckling Behavior

<p>In Japan, many steel structures were constructed during the period of the high economic miracle, and they are now more than 50 years old and are aging. Corrosion has been confirmed at corners and the boundary of concrete-wrapped concrete in steel piers. It was found that corrosion damage at the corner of steel piers causes a decrease of seismic performance in our previous investigations that carried out seismic response analysis. Subsequently, in this study, the effect of corrosion damage at the near ground edge of steel bridge piers with a rectangular cross-section was investigated in detail on the buckling behaviour and seismic performance of structures. As a result, it is found that the buckling at the base causes a decrease in load bearing performance compared to the buckling in the entire panel. It is necessary to properly maintain to prevent buckling at the base caused by corrosion.</p>

Collapse-Prevention Design and Damage-Reduction Seismic Performance Analysis of Bridges

2014 ◽  
Vol 638-640 ◽  
pp. 1997-2000 ◽  
Author(s):  
Yu Min Zhang ◽  
Ying Cui ◽  
Jing Liu
Keyword(s):  
Performance Analysis ◽  
Seismic Performance ◽  
Relative Displacement ◽  
Seismic Load ◽  
Design Standards ◽  
Research Results ◽  
Collapse Prevention ◽  
Damage Reduction ◽  
Structural Measure ◽  
At Home

As the crucial junction in transportation lines, more attention should pay to the safety of bridges. However, the collapse of bridges under earthquake threats the safe of lifeline engineering seriously. Unseating prevention devices are the effective structural measure to prevent collapse under unexpected earthquake. The design of unseating prevention devices need not only to meet the deformation demand of bridge during normal operations, but also to limit the oversize displacement under unexpected earthquake. Combined with relational design standards at home and abroad, unseating prevention devices have been designed for bridge to prevent collapse. The research results show that the unseating prevention devices with reasonable parameter will decrease the relative displacement between superstructure and substructure, improve the seismic performance and integrality of bridge, and make the seismic load to be well-distributed among the piers.

scholarly journals The Effect of Long Duration Earthquakes on the Overall Seismic Behavior of Steel Structures Designed According to Eurocode 8 Provisions

Vibration ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 464-477
Author(s):  
Panagiota Katsimpini ◽  
Foteini Konstandakopoulou ◽  
George A. Papagiannopoulos ◽  
Nikos Pnevmatikos ◽  
George D. Hatzigeorgiou
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Steel Structures ◽  
Eurocode 8 ◽  
Steel Buildings ◽  
Long Duration ◽  
Base Steel ◽  
Fixed Base ◽  
Permanent Settlement ◽  
Nonlinear Time History

Premature and simultaneous buckling of several steel braces in steel structures due to the prolonged duration of a seismic motion is one of the issues that must be addressed in the next version of Eurocode 8. In an effort to contribute towards the improvement of the seismic design provisions of Eurocode 8, an evaluation of the overall behavior of some steel building-foundation systems under the action of long duration seismic motions is performed herein by means of nonlinear time-history seismic analyses, taking into account soil–structure interaction (SSI) effects. In particular, the maximum seismic response results—in terms of permanent interstorey drifts, overturning moments and base shears of the steel buildings as well as of the permanent settlement and tilting of their foundations—are computed. It is found that the seismic performance of steel buildings when subjected to long duration seismic motions is: (i) acceptable for the two and five-storey fixed base steel buildings and for the two-storey steel buildings with SSI effects included; (ii) unacceptable for the eight-storey fixed base steel buildings and for the five and eight-storey steel buildings with SSI effects included. In all cases of steel buildings with SSI effects included, the seismic performance of the mat foundation, as expressed by the computed values of residual settlement and tilting, is always acceptable.

scholarly journals Experimental Study on the Seismic Performance of Steel H-Shaped Beam-to-Column Connections

2020 ◽  
Vol 20 (5) ◽  
pp. 1-9
Author(s):  
Seongyeon Seo
Keyword(s):  
Seismic Performance ◽  
Steel Structures ◽  
Initial Stiffness ◽  
Moment Frame ◽  
Shaped Beam ◽  
Shear Connections ◽  
Story Drift ◽  
Frame System ◽  
The Moment ◽  
Plastic Rotation Capacity

In terms of the moment frame system of steel structures, early brittle fractures developed in the H-shaped beam-to-column connection during the Northridge and Kobe earthquakes, thereby indicating insufficient seismic performance of these components. In this study, experiments were conducted on two-side shear connections of web and rib plate reinforcements of the flanges on an H-shaped beam-to-column connection. According to the test results, the H-shaped beam-to-column connections with two-side shear connections of beam web and rib plate reinforcements of the flanges were superior to the existing connections in terms of initial stiffness, energy dissipation capacity, and plastic rotational capacity. The test values exceeded 4.2%, 0.027 rad, and 125% in terms of story drift ratio, total plastic rotation capacity, and full plastic moment of the beam, respectively. Accordingly, the proposed H-shaped beam-to-column connection showed better performance than that of the intermediate moment frame regarding seismic design.

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