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Lin S.-S.,National Taiwan Ocean University | Hsu S.Y.,National Taiwan Ocean University | Liao J.C.,Taiwan Construction Research Institute | Lin J.G.,National Taiwan Ocean University
Geotechnical Special Publication | Year: 2012

Caisson foundation is a common type of foundation used for cross-river bridges in Taiwan. In this paper, failure envelope with respect to scouring depth, river flow velocity and water level effect is used to study how decisions are made on the closing of bridges during severe storm or typhoon. Two caisson case studies are also presented to check the applicability of the used method. And the analysis results show that the among the three factors considered in the failure envelope, variation of scouring depth and river flow velocity has higher influence of caisson foundation stability the water level change. © 2012 American Society of Civil Engineers. Source

Feng C.-W.,National Cheng Kung University | Chen Y.-J.,University of Kang Ning | Huang J.-R.,Taiwan Construction Research Institute
Automation in Construction | Year: 2010

Time and cost are two critical factors determining the success of a construction project. However, it is still a daunting task for project planners to develop a time-cost integrated schedule due to the tremendous amount of information that need to be processed. Various research efforts have been made to develop model-based systems to facilitate information processing and integrate time and cost throughout the project life cycle. However, the results of the previous studies are not comprehensive enough to fulfill the requirements of project management. This paper presents a scheduling system that applies Multi-Dimensional (MD) CAD model, Object Sequencing Matrix (OSM), and genetic algorithms (GAs) to generate the time-cost integrated schedule for the construction project. A computer implementation called MD CAD model-based Project Scheduling System (MD_PSS) is also developed to verify the feasibility of the proposed approach. © 2009 Elsevier B.V. All rights reserved. Source

Lin S.-S.,National Taiwan Ocean University | Liao J.-C.,Taiwan Construction Research Institute | Wang K.-J.,Trinity Consultants
Geotechnical Special Publication | Year: 2010

In this paper, the behavior and performance of four instrumented drilled shafts and two barrette piles socketed in andesite rock in Taipei are evaluated based on the results of pile load tests. The tests include two compressive and two tensile tests conducted on the drilled shafts and two tensile tests conducted on the barrette piles. The load versus displacement curve at the pile head and t-z curves along the shaft, especially for the part socketed in andesite rock, are main concerns and are presented and discussed in the paper. The value of the load corresponding to the intersection of the load deformation curve and three times the initial tangent slope is used to determine the ultimate capacity of each pile. Comparison of the andesite rock unit frictional resistance of each pile shows the average of the measured values is approximately half of the value suggested by the method of O'Neill and Reese (1999) and is much smaller than the value suggested by the method of Chen (1999). © ASCE 2010. Source

Lin S.-S.,National Taiwan Ocean University | Liao J.-C.,Taiwan Construction Research Institute | Wang K.-J.,Trinity Consultants
Geotechnical Special Publication | Year: 2010

This paper presents six case histories of load tests on reverse circulation method installed drilled shafts, with or without tip grouting, under axial load. Shaft displacement readings based on both telltale/extensometer and rebar strain gage are presented first. Subsequently, effect of loading cycle on shaft elastic modulus estimation is evaluated. The load versus displacement relationships at the shaft head, the t-z curves of the clay layer and of the gravel layer and the tip resistance versus displacement relationships are other important concerns and are compared in this paper. In addition, revised adhesion factor α and the parameter β based on the pile load test results are proposed in the paper. © 2010 ASCE. Source

Liao J.-C.,Taiwan Construction Research Institute | Lin S.-S.,National Taiwan Ocean University | Yang S.-D.,Artech Engineering Service Inc.
Proceedings of the Institution of Civil Engineers: Forensic Engineering | Year: 2013

In this paper, failure of a drilled shaft stabilised slope during basement excavation of an office building in Taipei city, Taiwan, is investigated. Four and two stages of excavation along the respective east and west sides of the site were planned. A row of drilled shafts was installed along each side before excavation. Severe slope movement occurred and extended outside the project area on both sides during excavation due to a weak clay layer overlying bedrock, unpredicted local trough between the soil/rock interface and improper design of the drilled shafts. Study of the possible reasons for failure includes monitoring results evaluation and numerical studies by means of the computer code Plaxis. Source

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