Hazard assessment of earthquake-induced landslides by using permanent displacement model considering near-fault pulse-like ground motions

Author(s):  
Jing Liu ◽  
Yingbin Zhang ◽  
Jiangtao Wei ◽  
Chenlin Xiang ◽  
Qingdong Wang ◽  
...  
2019 ◽  
Vol 16 (6) ◽  
pp. 1244-1257 ◽  
Author(s):  
Ying-bin Zhang ◽  
Chen-lin Xiang ◽  
Yan-long Chen ◽  
Qian-gong Cheng ◽  
Li Xiao ◽  
...  

2017 ◽  
Vol 50 (3) ◽  
pp. 1453
Author(s):  
N. Theodoulidis ◽  
I. Grendas

Near fault ground motions can be significantly different than those further away from the seismic source. Within the near fault zone ground motions are drastically influenced by the rupture mechanism, the direction of rupture propagation relative to the site and possible permanent displacement related to the fault slip. During the past two decades several sophisticated theoretical or/and empirical methods have been proposed to simulate near fault motion requiring input parameters that hardly can be provided with accuracy, leading thus to extended parametric studies and uncertainties. In this paper, a simple but effective analytical model that mathematically represents near fault ground motions (Mavroeidis and Papageorgiou, 2003) is applied and tested in the case of Cephalonia, Feb. 3, 2014 earthquake (Μ6.0). Its validity and reliability are examined and an effort to distinguish source and possible site effects is attempted for the town of Lixouri (LXR1 accelerograph) where the highest damage levels was observed.


2006 ◽  
Vol 22 (2) ◽  
pp. 367-390 ◽  
Author(s):  
Erol Kalkan ◽  
Sashi K. Kunnath

This paper investigates the consequences of well-known characteristics of near-fault ground motions on the seismic response of steel moment frames. Additionally, idealized pulses are utilized in a separate study to gain further insight into the effects of high-amplitude pulses on structural demands. Simple input pulses were also synthesized to simulate artificial fling-step effects in ground motions originally having forward directivity. Findings from the study reveal that median maximum demands and the dispersion in the peak values were higher for near-fault records than far-fault motions. The arrival of the velocity pulse in a near-fault record causes the structure to dissipate considerable input energy in relatively few plastic cycles, whereas cumulative effects from increased cyclic demands are more pronounced in far-fault records. For pulse-type input, the maximum demand is a function of the ratio of the pulse period to the fundamental period of the structure. Records with fling effects were found to excite systems primarily in their fundamental mode while waveforms with forward directivity in the absence of fling caused higher modes to be activated. It is concluded that the acceleration and velocity spectra, when examined collectively, can be utilized to reasonably assess the damage potential of near-fault records.


Author(s):  
Ling-Kun Chen ◽  
Peng Liu ◽  
Li-Ming Zhu ◽  
Jing-Bo Ding ◽  
Yu-Lin Feng ◽  
...  

Near-fault (NF) earthquakes cause severe bridge damage, particularly urban bridges subjected to light rail transit (LRT), which could affect the safety of the light rail transit vehicle (“light rail vehicle” or “LRV” for short). Now when a variety of studies on the fault fracture effect on the working protection of LRVs are available for the study of cars subjected to far-reaching soil motion (FFGMs), further examination is appropriate. For the first time, this paper introduced the LRV derailment mechanism caused by pulse-type near-fault ground motions (NFGMs), suggesting the concept of pulse derailment. The effects of near-fault ground motions (NFGMs) are included in an available numerical process developed for the LRV analysis of the VBI system. A simplified iterative algorithm is proposed to assess the stability and nonlinear seismic response of an LRV-reinforced concrete (RC) viaduct (LRVBRCV) system to a long-period NFGMs using the dynamic substructure method (DSM). Furthermore, a computer simulation software was developed to compute the nonlinear seismic responses of the VBI system to pulse-type NFGMs, non-pulse-type NFGMs, and FFGMs named Dynamic Interaction Analysis for Light-Rail-Vehicle Bridge System (DIALRVBS). The nonlinear bridge seismic reaction determines the impact of pulses on lateral peak earth acceleration (Ap) and lateral peak land (Vp) ratios. The analysis results quantify the effects of pulse-type NFGMs seismic responses on the LRV operations' safety. In contrast with the pulse-type non-pulse NFGMs and FFGMs, this article's research shows that pulse-type NFGM derail trains primarily via the transverse velocity pulse effect. Hence, this study's results and the proposed method can improve the LRT bridges' seismic designs.


2021 ◽  
Vol 230 ◽  
pp. 111694
Author(s):  
Héctor Dávalos ◽  
Eduardo Miranda
Keyword(s):  

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