A5067346095- Geotechnical Engineering and Underground Structures
- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Soil Stabilization
- Seismic Performance and Analysis
- Landslides and related hazards
- Geotechnical Engineering and Analysis
- Geological and Geophysical Studies
- Grouting, Rheology, and Soil Mechanics
- Soil, Finite Element Methods
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Fluid Dynamics and Vibration Analysis
- earthquake and tectonic studies
University of Colorado Boulder
2020-2024
National Yang Ming Chiao Tung University
2022-2024
National Taiwan University
2017-2024
Pontificia Universidad Católica de Chile
2024
National Taiwan University of Science and Technology
2024
The University of Texas at Austin
2022-2023
ORCID
2021-2022
National Center for Research on Earthquake Engineering
2018
National Applied Research Laboratories
2018
In urban environments, structures are often built in close proximity to each other. Seismic coupling and structure-soil-structure interaction (SSSI) known affect system accelerations, settlement, tilt with consequential impact on structural damage. Yet, the extent nature of these interactions poorly understood, particularly ground susceptible liquefaction. this paper, we use dynamic centrifuge numerical modeling isolated neighboring, similar dissimilar, shallow-founded layered, level,...
On February 6, 2015, a local magnitude (ML) 6.6 earthquake struck southern Taiwan, devastating the Tainan area. A field investigation was conducted by survey team from National Center for Research on Earthquake Engineering immediately after earthquake. This paper summarizes observed geotechnical damage features caused earthquake, including liquefaction, slope sliding, levee failure, and dam performance. Several liquefaction sites were despite intensity of ground shaking being moderate (peak...
Ground densification is a common countermeasure against soil liquefaction. The state-of-practice for designing ground typically based on empirical estimates of liquefaction triggering and settlement in the free field, ignoring seismic soil-structure interaction (SSI) near building structures. existing guidelines geometry also do not take into account constraints introduced by presence neighboring foundation, or impact structure-soil-structure (SSSI) performance adjacent buildings urban...
ABSTRACT The Mw 7.2 Nippes, Haiti, earthquake occurred on 14 August 2021 in Haiti’s southwest peninsula and the midst of significant social, economic, political crises. A hybrid reconnaissance mission (i.e., combined remote field investigation) was coordinated to document damage built environment after event. This article evaluates two ground-motion records available Haiti context geology region known areas with damage, such as Les Cayes. We also present a new map time-averaged shear-wave...
In this paper, we present a probabilistic predictive procedure for foundation's permanent average settlement on liquefiable soils improved with ground densification. The proposed is based 770 three-dimensional (3D), fully coupled, effective-stress, finite-element analyses designed through quasi-Monte Carlo sampling of key input parameters. numerical models are themselves calibrated and validated centrifuge model studies, they consider realistic, nonlinear, 3D structures shallow foundations,...
Geometric and stratigraphic evidence indicates that the East Shetland Basin evolved by a rift mechanism similar to defined in African Rift. Arcuate half-grabens of probable Devonian extensional origin are fundamental structural units. The data suggest episodic footwall movements during mid- late Jurassic as well alternating regional subsidence patterns, i.e. ‘teeter-totter’, against Horda Platform. Northern North Sea system, which includes Basin, is believed have opened primarily orthogonal...
Research Article| October 10, 2018 Soil Liquefaction and Ground Settlements in 6 February Hualien, Taiwan, Earthquake Yung‐Yen Ko; Ko aDepartment of Civil Engineering, National Cheng Kung University, No. 1, University Road, Tainan 70101, yyko@mail.ncku.edu.tw Search for other works by this author on: GSW Google Scholar Shang‐Yi Hsu; Hsu bNational Center on Applied Laboratories, 200, Section 3, Hsinhai Taipei 10668, Taiwan Hsuan‐Chih Yang; Yang Chih‐Chieh Lu; Lu Yu‐Wei Hwang; Hwang Chia‐Hung...
Geotechnical centrifuge modeling is a common tool that provides insight into the liquefaction phenomena and its associated consequences on buildings. Most prior experiments aimed to evaluate an isolated structure's response had one or more model buildings present in container at center-to-center spacing ranging from about 2W 4.6W (where W foundation width). This paper presents results of two influence boundaries possible interaction with other building models flexible-shear-beam (FSB)...
An indentation test was developed to indirectly determine the effective tensile strength of lightly cemented sand by iterative method. The description is followed a discussion and comparison determination soil under framework proposed in previous research. Test results reveal that, general, proportional indenter diameter (a) specimen ratio (b), a/b, has no apparent relationship with height (H) ratio, H/2b. method provides more realistic approach compute stress beyond traditional In addition,...
Abstract A numerical model based on the finite element framework was developed to predict seismic response of saturated sand under free-field conditions. The used a non-linear coupled hypoplastic u-p formulation simulate behaviour sand. constitutive implemented as user-defined routine in commercial ABAQUS explicit 6.14. Results centrifuge experiments simulating site layered system were validate results. test consisted three-layered subjected one-dimensional shaking at base. set-up equipped...
Buildings are often located in close proximity to each other urban settings. Seismic structure-soil-structure interaction near two adjacent buildings (SSSI2) on liquefiable soils has previously been investigated and shown be consequential. However, these studies did not evaluate the impact of multiple SSSI3+ (exceeding three a cluster) key engineering demand parameters (EDPs). In this paper, we systematically explore influence SSSI3+, building spacing (S) relation width (W), arrangement,...
Footings are normally used on firm ground. Previous studies have indicated that footings with large vertical bearing capacity small settlement and recentering characteristics during excitation. The rocking foundation design is, therefore, considered quite suitable for a ground condition; however, some 1 g shaking table tests shown structures still might stability problems leading to toppling. In this study, we conducted pushover rocking-governed column-footing model dry dense sand...
In practice, a unidirectional horizontal ground motion is often selected as input during the design of geotechnical systems. This recording obtained either component with greatest intensity [e.g., in terms primary measure, IM, like peak acceleration (PGA)] or maximum rotated (RotD100, again an IM PGA). Although seismic deformations are generally assumed to be governed by direction shaking under (1D), prior experimental research has shown that bidirectional (BD) can increase settlements dry...
Monopile foundations are known as the most common foundation solution for offshore wind turbines (OWTs). However, state of practice designing monopile in high seismicity areas is still limited. In this paper, three-dimensional, fully coupled, nonlinear finite-element analyses were used to evaluate seismic performance hypothetical 5MW on layered, liquefiable sites under motions with and without forward directivity. The numerical results showed that pile movements induced by loading led a bias...