scholarly journals Performance Evaluation of Seismic Isolation System by Installation Location in Lighthouse Structures

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Moo-Won Hur ◽  
Tae-Won Park
Keyword(s):  
Performance Evaluation ◽  
Seismic Performance ◽  
Seismic Design ◽  
Seismic Isolation ◽  
Isolation Effect ◽  
Design Criteria ◽  
Seismic Loads ◽  
Isolation System ◽  
Marine Accidents

The purpose of this study is to evaluate the applicability of seismic isolation devices for marine accidents under seismic loads. The lighthouse structure is a very important facility when the ship approaches the port. However, it is necessary to reinforce the structure to protect it from earthquake. This study presents isolation technology as a method to enhance the seismic performance of lighthouse structures built before seismic design criteria were established. This paper analyzed improvement of seismic performance in three cases of seismic isolation by applying the proposed method of isolation technology. In Case 1, the entire lighthouse structure is isolated, and in Case 2, only the lighthouse lens, the most important component of the lighthouse structure, has been isolated to assure constructability and economy. In Case 3, isolation effect was analyzed by comparing Case 1 and Case 2 with lighthouse structures.

Analysis of Vibration Isolator’s Anti-Seismic Performance in Porcelain SF6 High Voltage Circuit Breaker

2013 ◽  
Vol 448-453 ◽  
pp. 2045-2048
Author(s):  
Yan Zhong Ju ◽  
Xin Lei Wu
Keyword(s):  
Seismic Performance ◽  
High Voltage ◽  
Seismic Isolation ◽  
Circuit Breaker ◽  
Isolation System ◽  
High Voltage Circuit Breaker ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Sf6 Circuit Breaker ◽  
Isolation Device

Choosing LW15-550Y porcelain high voltage SF6 circuit breaker as the research subject, we designed the lead laminated rubber bearing (LRB) seismic isolation device for LW15-550Y circuit breaker. We finally gets the results that the LRB isolation system increases the flexibility of the breaker structure and improves the seismic performance of the high voltage circuit breaker structure.

New Seismic Design Criteria of Piping Systems in High-Pressure Gas Facilities

2004 ◽  
Vol 126 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Makoto Inaba ◽  
Masatoshi Ikeda ◽  
Nobuyuki Shimizu
Keyword(s):  
High Pressure ◽  
Seismic Performance ◽  
Seismic Design ◽  
Evaluation Method ◽  
Design Criteria ◽  
Ground Displacement ◽  
Piping Systems ◽  
Level 1 ◽  
Deformation Tests ◽  
Level 2

After the Great Hyogoken-nanbu Earthquake (1995), the Seismic Design Code for High-Pressure Gas Facilities of Japan was amended. This amended code requires two-step seismic assessments, that is, the evaluation of the Level 1 Required Seismic Performance for Level 1 earthquakes and that of the Level 2 Required Seismic Performance for Level 2 earthquakes. Seismic design of piping systems is newly included within the scope of the code. For Level 2 earthquakes, possible ground displacement due to liquefaction is taken into account. The evaluation method of the Level 1 Required Seismic Performance is specified in the amended code and that of the Level 2 Required Seismic Performance is proposed in the guideline. The evaluation of the former is based on elastic design and that of the latter on elastoplastic design. The propriety of the design criteria of piping systems with respect to ground displacement was confirmed by large deformation tests. In this paper, seismic design criteria of piping systems in the amended code and the evaluation method of the Level 2 Required Seismic Performance proposed in the guideline are introduced, and the results of the large deformation tests are reported.

scholarly journals Link Slab Capacity In Bridges Supported By Lead Rubber Bearing And Elastomer

2019 ◽  
Vol 24 (2) ◽  
pp. 73
Author(s):  
Inas Novikasari ◽  
Anis Rosyidah
Keyword(s):  
Seismic Isolation ◽  
Design Criteria ◽  
Isolation System ◽  
Expansion Joints ◽  
Debris Accumulation ◽  
Seismic Isolator ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Seismic Force ◽  
High Level

Debris accumulation in bridge slab gaps which use expansion joints can restrain deck expansion, causing undesirable forces on floor deck and damage to the structure. In order to avoid the worst possibility that can occur, an alternative using link slab is utilized. The use of link slab at high level seismic force location, requires the Seismic Isolation System on bridge to reduce the seismic force. The application of Seismic Isolation System can be conducted by Lead Rubber Bearing (LRB) type of seismic isolator. This study compares the use of Lead Rubber Bearing (LRB) and elastomer on bridge link slabs against the dimension of the link slab. In this study structural modeling used 2 models: bridges supported by elastomer and bridges supported by LRB with software-made. The link slab analysis approach used were analytical methods or classical methods. Based on results of the analysis, the width of the crack that occured on bridge supported by LRB is 0.218 mm while on the bridge supported by elastomer is 0.269 mm. The use of Lead Rubber Bearing (LRB) type of support will give more advantages to the design of the link slab since it results in smaller crack design criteria.

Seismic Performance Evaluation of Steel Ordinary Moment Frames

2018 ◽  
Vol 34 (1) ◽  
pp. 55-76 ◽  
Author(s):  
Sang Whan Han ◽  
Tae O Kim ◽  
Seong Jin Baek
Keyword(s):  
Performance Evaluation ◽  
Seismic Performance ◽  
Seismic Design ◽  
Moment Frames ◽  
American Institute ◽  
Wind Drift ◽  
Seismic Performance Evaluation ◽  
Weak Beam ◽  
Seismic Force ◽  
American Society

Steel ordinary moment frames (OMF) are seismic force-resisting systems that can be used in buildings. In current seismic design and detailing provisions, such as the American Society of Civil Engineers ASCE/SEI 7-10 (2010) , American Institute of Steel Construction ANSI/AISC 341-10 (2010), and ANSI/AISC 358-10 (2010) , less stringent design and detailing requirements are specified for steel OMFs compared with those for steel special- and intermediate-moment frames. The strong-column weak-beam (SC/WB) requirement is not enforced for steel OMF connections. In the present study, the seismic performance evaluation is conducted for steel OMFs designed according to current seismic design and detailing provisions considering different combinations of gravity, seismic, and wind loads, as well as wind drift limits. Based on the results of seismic performance evaluation, permissible structural heights for steel OMFs are also proposed.

scholarly journals A Study on Seismic Isolation of Shield Tunnel Using Quasi-Static Finite Element Method

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Can Li ◽  
Weizhong Chen ◽  
Wusheng Zhao ◽  
Takeyasu Suzuki ◽  
Yoshihiro Shishikura
Keyword(s):  
Finite Element ◽  
Shear Modulus ◽  
Seismic Isolation ◽  
Transverse Direction ◽  
Longitudinal Direction ◽  
Isolation Effect ◽  
Poisson's Ratio ◽  
Shield Tunnel ◽  
Isolation System ◽  
Isolation Layer

Using a quasi-static method based on an axisymmetric finite element model for seismic response analysis of seismically isolated tunnels, the seismic isolation effect of the isolation layer is studied, and the seismic isolation mechanism of the isolation layer is clarified. The results show that, along the longitudinal direction of the tunnel, the seismic isolation effect is mainly affected by the shear modulus of the isolation material. The smaller the shear modulus is, the more evident the seismic isolation effect is. This is due to the tunnel being isolated from deformation of its peripheral ground through shear deformation of the isolation layer. However, along the transverse direction of the tunnel, the seismic isolation effect is mainly affected by the shear modulus and Poisson’s ratio of the isolation material. When Poisson’s ratio is close to 0.5, a seismic isolation effect is not evident because the tunnel cannot be isolated from deformation of its peripheral ground through compression deformation of the isolation layer. Finally, a seismic isolation system comprising a shield tunnel in which flexible segments are arranged at both ends of an isolation layer is proposed, and it is proved that the seismic isolation system has significant seismic isolation effects both on the longitudinal direction and on the transverse direction.

scholarly journals Seismic Design and Performance Evaluation of Fusion-Type Polyethylene Pipeline

2020 ◽  
Vol 20 (5) ◽  
pp. 297-307
Author(s):  
DongSoon Park
Keyword(s):  
Performance Evaluation ◽  
Seismic Performance ◽  
Seismic Design ◽  
Ground Deformation ◽  
Axial Strain ◽  
Evaluation Procedure ◽  
Seismic Performance Evaluation ◽  
Evaluation Procedures ◽  
And Performance ◽  
Fusion Type

It is known that buried polyethylene (PE) pipes exhibit good seismic performance owing to their flexibility and ductility. The use of PE pipes as buried pipelines is gradually increasing, but currently, there are no seismic design or seismic performance evaluation procedures for domestic PE pipes in Korea. In this study, a seismic design and performance evaluation procedure for a domestic fusion-type PE pipe was developed based on the response displacement method, which is relatively easy to apply. The procedure was based on a method of examining whether the sum of the axial strain induced by both normal and seismic loading was within the allowable strain of the PE pipe. While calculating the axial strain of the ground, a coefficient was introduced to account for the heterogeneity of the ground. A seismic review method for ground deformation, i.e., ground liquefaction, was also introduced. The proposed procedure will provide a useful technical basis for evaluating the seismic design and performance of buried PE pipes in future studies.

Sign in / Sign up

Export Citation Format

Share Document