scholarly journals Seismic Response of Container Crane under Near-Field and Far-Field Ground Motions

2021 ◽  
Vol 11 (4) ◽  
pp. 1740
Author(s):  
Van Bac Nguyen ◽  
Jungwon Huh ◽  
Bismark Kofi Meisuh ◽  
Jongwoo Kim ◽  
Inn-Joon Park
Keyword(s):  
Seismic Response ◽  
Shaking Table Test ◽  
Ground Motions ◽  
Near Field ◽  
Bending Moment ◽  
Shaking Table ◽  
Far Field ◽  
Container Crane ◽  
National University ◽  
Geometric Length

In this study, the seismic response of a container crane under near-field and far-field ground motions was investigated using a shaking table test on a 1/20 scale crane. The 1/20 scale crane was designed and fabricated based on the similitude laws, in which three independent quantities: geometric length, acceleration, and elastic modulus, were used to design the 1/20 scale crane. A series of shaking table tests were conducted at the Seismic Research and Test Center, Pusan National University, Yangsan Campus to evaluate the seismic response of the scale crane under near-field and far-field ground motions. The results show that the near-field ground motions can cause larger internal forces (that is, axial force and two bending moments) in the landside and seaside legs and larger portal drift than the far-field ground motions. The portal drift of the container crane subjected to the near-field ground motions was 43% higher than that of the container crane subjected to the far-field ground motions. Furthermore, when subjected to the near-field ground motion, the bending moment in the crane’s portal leg was 37% higher than the bending moment when the crane was subjected to the far-field ground motions.

scholarly journals On the Seismic Response of Protected and Unprotected Middle-Rise Steel Frames in Far-Field and Near-Field Areas

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Dora Foti
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
Near Field ◽  
Shaking Table ◽  
Far Field ◽  
Base Shear ◽  
Friction Dampers ◽  
Steel Moment Resisting Frames ◽  
Damage Indices ◽  
Moment Resisting

Several steel moment-resisting framed buildings were seriously damaged during Northridge (1994); Kobe (1995); Kocaeli, Turkey (1999), earthquakes. Indeed, for all these cases, the earthquake source was located under the urban area and most victims were in near-field areas. In fact near-field ground motions show velocity and displacement peaks higher than far-field ones. Therefore, the importance of considering near-field ground motion effects in the seismic design of structures is clear. This study analyzes the seismic response of five-story steel moment-resisting frames subjected to Loma Prieta (1989) earthquake—Gilroy (far-field) register and Santa Cruz (near-field) register. The design of the frames verifies all the resistance and stability Eurocodes’ requirements and the first mode has been determined from previous shaking-table tests. In the frames two diagonal braces are installed in different positions. Therefore, ten cases with different periods are considered. Also, friction dampers are installed in substitution of the braces. The behaviour of the braced models under the far-field and the near-field records is analysed. The responses of the aforementioned frames equipped with friction dampers and subjected to the same ground motions are discussed. The maximum response of the examined model structures with and without passive dampers is analysed in terms of damage indices, acceleration amplification, base shear, and interstory drifts.

scholarly journals An Arc-consistent Viscous-spring Artificial Boundary for Numerical Analysis of the Seismic Response of Underground Structures

2021 ◽  
Author(s):  
Dan Ye ◽  
Shangzhi Yin ◽  
Dengzhou Quan
Keyword(s):  
Numerical Analysis ◽  
Seismic Response ◽  
Shaking Table Test ◽  
Near Field ◽  
Shaking Table ◽  
Test Results ◽  
Underground Structures ◽  
Artificial Boundary ◽  
Finite Element Software ◽  
Artificial Boundaries

Abstract A new arc consistent viscous-spring artificial boundary (ACVAB) was proposed by changing a traditional flat artificial boundary based on the theory of viscous-spring artificial boundaries. Through examples, the concept underpinning the establishment, and specific setting of, the boundary in the finite element software were described. Through comparison with other commonly used artificial boundaries in an example for near-field wave analysis using the two-dimensional (2-d) half-space model, the reliability of the ACVAB was verified. Furthermore, the ACVAB was used in the numerical analysis of the effects of an earthquake of underground structures. The results were compared with shaking-table test results on underground structures. On this basis, the applicability of the ACVAB to a numerical model of the seismic response of underground structures was evaluated. The results show that the boundary is superior to common viscous-spring boundaries in terms of accuracy and stability, and therefore it can be used to evaluate radiation damping effects of seismic response of underground structures and is easier to use.

Seismic Response Characteristics of a Building Supported by Pile Foundation in Frozen Soil Based on Shaking Table Test

2016 ◽  
Vol 10 (02) ◽  
pp. 1640005 ◽  
Author(s):  
Shuang Xing ◽  
Miyamoto Yuji
Keyword(s):  
Seismic Response ◽  
Pile Foundation ◽  
Natural Frequencies ◽  
Shaking Table Test ◽  
Bending Moment ◽  
Frozen Soil ◽  
Shaking Table ◽  
Saturated Sand ◽  
Frozen Ground ◽  
Response Characteristics

This paper focuses on the influence of frozen soil on seismic response of a building supported by pile foundation. Firstly, the saturated sand soil is frozen artificially, and then shaking table tests are conducted. Specifically, seismic responses of buildings with different natural frequencies and with different freezing depths of the saturated soil are investigated, respectively. In this study, it is confirmed that for buildings with high rigidity, the effect of interaction becomes smaller when the soil is frozen. Moreover, it is observed that the resonant frequency of frozen ground is closer to the natural frequency of superstructure, and thus the response of the superstructure becomes larger. It is also observed that the bending moment along the pile is remarkably reduced by improving the rigidity of the soil.

scholarly journals An Arc-Consistent Viscous-Spring Artificial Boundary for Numerical Analysis of Seismic Response of Underground Structures

2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Dan Ye ◽  
Shangzhi Yin ◽  
Yihong Wang ◽  
Taian Zuo
Keyword(s):  
Numerical Analysis ◽  
Seismic Response ◽  
Shaking Table Test ◽  
Near Field ◽  
Shaking Table ◽  
Test Results ◽  
Underground Structures ◽  
Artificial Boundary ◽  
Finite Element Software ◽  
Artificial Boundaries

A new arc-consistent viscous-spring artificial boundary (ACVAB) was proposed by changing a traditional flat artificial boundary based on the theory of viscous-spring artificial boundaries. Through examples, the concept underpinning the establishment and specific setting of the boundary in the finite element software were described. Through comparison with other commonly used artificial boundaries in an example for near-field wave analysis using the two-dimensional (2D) half-space model, the reliability of the ACVAB was verified. Furthermore, the ACVAB was used in the numerical analysis of the effects of an earthquake on underground structures. The results were compared with the shaking table test results on underground structures. On this basis, the applicability of the ACVAB to a numerical model of seismic response of underground structures was evaluated. The results show that the boundary is superior to common viscous-spring boundaries in terms of accuracy and stability, and therefore, it can be used to evaluate radiation damping effects of seismic response of underground structures and is easier to use.

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