scholarly journals DISCUSSION/CLOSURE “BASIC PRINCIPLES AND DESIGN GROUND MOTIONS IN SEISMIC RETROFIT DESIGN OF LARGE CABLE-SUPPORTED BRIDGES ON THE TOKYO METROPOLITAN EXPRESSWAY”

2006 ◽  
Vol 62 (4) ◽  
pp. 909-914
Author(s):  
Kazuo KOMORI ◽  
Hiroshi KIKKAWA ◽  
Naoyuki ODAGIRI ◽  
Takuo KINOSHITA ◽  
Takao MIZOGUCHI ◽  
...  
Keyword(s):  
Ground Motions ◽  
Seismic Retrofit ◽  
Basic Principles ◽  
Tokyo Metropolitan ◽  
Retrofit Design

scholarly journals BASIC PRINCIPLES AND DESIGN GROUND MOTIONS IN SEISMIC RETROFIT DESIGN OF LARGE CABLE-SUPPORTED BRIDGES ON THE TOKYO METROPOLITAN EXPRESSWAY

2005 ◽  
pp. 1-19 ◽  
Author(s):  
Kazuo KOMORI ◽  
Hiroshi KIKKAWA ◽  
Naoyuki ODAGIRI ◽  
Takuo KINOSHITA ◽  
Takao MIZOGUCHI ◽  
...  
Keyword(s):  
Ground Motions ◽  
Seismic Retrofit ◽  
Basic Principles ◽  
Tokyo Metropolitan ◽  
Retrofit Design

scholarly journals VERIFICATION OF NONLINEAR SEISMIC RESPONSE VALUES USED FOR THE SEISMIC RETROFIT DESIGN OF YOKOHAMA BAY BRIDGE

2010 ◽  
Vol 66 (1) ◽  
pp. 31-36
Author(s):  
Yasumiki YAMAMOTO ◽  
Hisamitsu HANNO ◽  
Yozo FUJINO ◽  
Masaaki YABE
Keyword(s):  
Seismic Response ◽  
Seismic Retrofit ◽  
Nonlinear Seismic Response ◽  
Retrofit Design

Toward a Philosophy for Seismic Retrofit: The Seattle Experience

1989 ◽  
Vol 5 (3) ◽  
pp. 557-569
Author(s):  
T. W. Perbix ◽  
P. Burke
Keyword(s):  
Social Policy ◽  
Seismic Retrofit ◽  
Economic Consequences ◽  
Life Safety ◽  
Seismic Events ◽  
Social Conflicts ◽  
Safety Aspects ◽  
Before And After ◽  
Everyday Design ◽  
Retrofit Design

By examining seismic retrofit experience with three buildings in Seattle, important practical issues regarding the underlying economic, political, and social conflicts are explored. The philosophy of seismic retrofit and its resulting consequences for life safety, building usefulness both before and after seismic events, and the economic consequences of retrofit are examined in light of the professional and regulatory atmosphere. While a great deal of information is generated nationally in the field of seismic retrofit, its assimilation by the practising professional and regulatory official is incomplete and uncoordinated. The work proposes, therefore, a seismic retrofit design philosophy for discussion and possible use as a premise for development of codes. The proposed philosophy coordinates the economic, social, and life safety aspects of seismic retrofit in a way that meets the needs of designers and regulators who are currently forced to make social policy in their everyday design interactions.

Seismic Isolation Retrofitting of Typical Multi-Span Steel Girder Bridges in New York State

2020 ◽  
Vol 2674 (8) ◽  
pp. 785-798 ◽  
Author(s):  
Dongming Feng ◽  
Fangyin Zhang
Keyword(s):  
New York ◽  
Seismic Isolation ◽  
Ground Motions ◽  
Limit State ◽  
New York State ◽  
Time History ◽  
Seismic Retrofit ◽  
Structural Members ◽  
York State ◽  
Simply Supported

Many of the existing multi-span simply supported bridges in New York State, U.S., are susceptible to earthquake damage and need to be retrofitted to reduce their seismic risk. In this study, seismic retrofit of a five-span simply supported bridge with typical high-type fixed and expansion steel rocker bearings is conducted. A refined three-dimensional (3D) finite element model of the bridge is developed in ANSYS by considering foundation impedances. Multi-support time history analyses have been implemented in the seismic retrofit design for two levels of ground motions: 1,000- and 2,500-year return period earthquakes. The site-specific ground motions with consideration of the spatial variation are generated based on the geotechnical information. Seismic retrofit by replacing existing steel bearings with lead-rubber bearing (LRB) isolators has been adopted. The parameters of the isolators are determined by considering factors such as the seismic performance and translational resistance during normal service. The vulnerability of structural members and seismic retrofit effectiveness are quantified by the demand-to-capacity (D/C) ratio for the combined demands at the extreme limit state. The analyses show that after seismic isolation retrofit the pervasive vulnerabilities in pier columns and cap beams are eliminated. Comparing with strengthening the vunerable structural members, seismic isolation is proved a cost-effective retrofit solution. The overall seismic isolation design and analysis procedures presented in this study can help guide future seismic retrofit of similar types of bridges.

Analysis of Existing Piles with Missing Data in Seismic Retrofit Design at the Port of Oakland

Ports '01 ◽  
2001 ◽  
Author(s):  
D. Oyenuga ◽  
S. Abe ◽  
H. Sedarat ◽  
A. Krimotat ◽  
S. Salah-Mars ◽  
...  
Keyword(s):  
Missing Data ◽  
Seismic Retrofit ◽  
Port Of Oakland ◽  
Retrofit Design

Seismic retrofit for the truss bridges of the Seto-Ohashi Bridges

2016 ◽  
Author(s):  
Susumu Fukunaga
Keyword(s):  
Seismic Design ◽  
Large Scale ◽  
Near Field ◽  
Seismic Retrofit ◽  
Box Section ◽  
Truss Bridges ◽  
Bolt Holes ◽  
Near Future ◽  
Retrofit Design

In original seismic design of the Seto-Ohashi Bridges, an inland near-field earthquake was not considered. And there is concern that large-scale earthquakes would occur in the near future. Therefore seismic retrofit for truss bridges of the Seto-Ohashi Bridges has started. In the seismic retrofit design for the truss bridges, it was decided that seismic response of overall bridge was reduced firstly and the truss members were strengthened by additional stiffeners secondly. The stiffeners were attached to the truss members by bolting, because it was difficult to ensure quality of field welding. As inner surface of the closed box-section truss members has no coating, drilling bolt holes in the members was thought to increase the probability of corrosion of the members. Therefore it was decided to apply airtightness measures for the inside of the closed box-section members after their drying.

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