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  Optimum design of base isolated RC structures
Posted by: TAFATNEB - 12-20-2013, 09:41 AM - Forum: Civil Engineering MSc and PhD thesis - No Replies

Optimum design of base isolated RC structures

Author: Fani Chatzidaki | Size: 3.3 MB | Format: PDF | Quality: Unspecified | Year: 2011 | pages: 142

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The main idea of the study is the optimum design and the economic evaluation of reinforced (RC) conventional and isolated structures. For the purpose of the study two symmetrical RC structures were studied, designed both with and without seismic isolation, following a performance based concept. The seismic isolation was accomplished by the use of Lead-Rubber Bearings (LRB) and High Damping Rubber Bearings (HDNR).
In the first chapter, the seismic isolation technique is described, as well as the conditions and the applications of the method worldwide, along with the types of the isolation devices.
In the second chapter, the modeling, the preliminary design and the final design of the bearings is described.
In the third chapter, the analysis procedures are presented, and specifically the Linear Static Procedure (LSP), the Nonlinear Static Procedure (NSP) according to the recommendations of FEMA-356 and the Nonlinear Dynamic Procedure (NDP).
Thereafter, in the fourth chapter the structural optimization problem is described, along with the history of the technique and the formulation of the problem. The design variables, the objective function and the constraint functions are defined, as well as the three types of optimization. Finally, the Evolutionary Algorithms (EA) are presented, with emphasis to the Differential Evolution (DE).
In the fifth chapter the procedure of Life-Cycle Cost Analysis (LCCA) is presented, which can be used as an assessment tool of the response of the building during its expected lifetime. The calculation of the procedure is analyzed, as well as the steps to incorporate the nonlinear dynamic analysis in the calculation procedure.
Subsequently, in the sixth and seventh chapter the test cases of the study are presented analytically, along with the conclusions that are obtained from this process.

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  Base isolation of an existing 10-storey building to enhance earthquake resistance
Posted by: TAFATNEB - 12-20-2013, 09:34 AM - Forum: Journals, Papers and Presentations - No Replies

Base isolation of an existing 10-storey building to enhance earthquake resistance

Author: W.D. Clark and J.E. Mason Sinclair Knight Merz, Wellington, New Zealand | Size: 334 KB | Format: PDF | Quality: Unspecified | Year: 2004 | pages: 8

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The Rankine Brown Building at Victoria University of Wellington, New Zealand houses the University Library and is pivotal to the operation of the University. Built in the early 1960s, the building was of innovative form and construction for its time, with long span precast concrete waffle slabs over 10 floors supported on 16 main columns. Three years ago a review of the building structure suggested that increased protection of the building would be required to meet the University’s expectation for operational continuity after a moderate or major earthquake event in the Wellington area. This paper outlines: Probable areas of structural yielding in a major earthquake event. Structural analysis for base isolation using earthquake time history records. Details of base isolation bearings. Installation of the base isolation bearings.nOther structural details that allow movement of the superstructure to take place due to base isolation.


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  SEISMIC PERFORMANCE ASSESSMENT OF NUCLEAR POWER PLANTS
Posted by: TAFATNEB - 12-20-2013, 09:22 AM - Forum: Journals, Papers and Presentations - No Replies

SEISMIC PERFORMANCE ASSESSMENT OF NUCLEAR POWER PLANTS

Author: Yin-Nan Huang , Andrew S. Whittaker and Nicolas Luco | Size: 152 KB | Format: PDF | Quality: Unspecified | Publisher: The 14 th World Conference on Earthquake Engineering October 12-17, 2008, Beijing, China | Year: 2008 | pages: 8

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Seismic assessments of a sample conventional and base-isolated nuclear power plant (NPP) are performed using a new procedure that builds on the methodology presented in the draft ATC-58 Guidelines and the widely used Zion method, which uses fragility curves defined in terms of ground-motion parameters. The new procedure improves the Zion method by using fragility curves that are defined in terms of structural response parameters since damage and failure of NPP components are more closely tied to structural response parameters than to ground motion parameters. The proposed performance assessment procedure is used to
evaluate the mean annual probability of unacceptable performance of the sample NPP reactor buildings. The
seismic performance assessment confirms the utility of seismic isolation at reducing seismic risk in NPPs.

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  SEISMIC RISK AND DAMAGE COST EVALUATION OF BASE ISOLATED BUILDINGS
Posted by: TAFATNEB - 12-20-2013, 09:14 AM - Forum: Journals, Papers and Presentations - No Replies

SEISMIC RISK AND DAMAGE COST EVALUATION OF BASE ISOLATED BUILDINGS

Author: Luis A. BEDRIÑANA1 and Taiki SAITO2 | Size: 372 KB | Format: PDF | Quality: Unspecified | Publisher: IISEE, Building Research Institute, Tsukuba, Japan. | pages: 8

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A methodology to evaluate quantitatively the seismic risk and the cost-effectiveness of a base isolated building
during its lifetime is presented. The process starts with the hazard analysis and the earthquake ground motion
modeling for the studied area. Series of artificial earthquake ground motions are generated by a stochastic method.
To get the response distribution of the target building, several dynamic nonlinear analyses are carried out by using
the generated artificial motions as input waves. By assuming a structural response distribution, the seismic risk
analysis is performed in terms of three structural parameters such as: interstory drift ratio (IDR), floor acceleration
(FA) and the structural damage index (DI). Finally, the cost-effectiveness of using base isolation system is
examined, by comparing the exceedance probability of repair cost in the target building with and without base
isolation during a given time period.

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  RISK ASSESSMENT USING SEISMIC RISK MANAGEMENT AND RESPONSE ANALYSIS OF BASE ISOLATION
Posted by: TAFATNEB - 12-20-2013, 09:05 AM - Forum: Journals, Papers and Presentations - No Replies

RISK ASSESSMENT USING SEISMIC RISK MANAGEMENT AND RESPONSE ANALYSIS OF BASE ISOLATION STRUCTURE

Author: Masaaki YOSHIKAWA Hiroshi MORIMOTO | Size: 299 KB | Format: PDF | Quality: Unspecified | pages: 8

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For structures that receive a large earthquake it is required to apply a good technique which suppresses a danger to the minimum irrespective of existing and establishment. A technique of seismic risk management dealt with the quantitative amount of information is to obtain the anticipative amount of the earthquake damages during access peri
od,and is the support tool to select the higher expense efficiency step to reduce an earthquake damage. In this study,the method of seismic risk management is searched for
using the earthquake proof reliability assessment technique. A seismic lose function is calculated from the earthquake damage factors that are modeled by using fragility curves and event trees. The seismic hazard curve is obtained by Nankai offshore scenario earthquake. The third floor or the eighth floor steel structures on a hard or soft ground in Kochi Prefecture are taken up as SRM(Seismic Risk Management Method) study cases. Using structures from as three kinds of seismic code,costs of both initial construction and life cycle are calculated. As the results,the seismic risk reduces to half by ground conditions. Though initial investment becomes high so that earthquake resi stant construction goes up,the life cycle costs and the seismic risk become small. The seismic risk of the base isolation structure is set to zero,and excels as the earthquake resistant construction. Then,the eighth floor steel structure with the base isolation system is applied to obtain time history responses in comparison of those by the different input wave motions. The base isolation building is able to reduce a strong motion because of the long time period shake,and is efective to the short period large earthquake motion

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  ACI 345: Guide for Concrete Highway Bridge Deck Construction
Posted by: ir_71 - 12-19-2013, 06:17 PM - Forum: ACI - Replies (3)

ACI 345R-11 Guide for Concrete Highway Bridge Deck Construction

Author: ACI Committee 345 | Size: 40.8 MB | Format: PDF | Quality: Unspecified | Publisher: ACI | Year: 2011 | pages: 42 | ISBN: 9780870314100

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The service-life performance of concrete bridge decks, including maintenance, repair, and rehabilitation needs, is directly related to the care exercised from the preconstruction through post-construction period. This guide provides recommendations for bridge deck construction based on considerations of durability, concrete materials, reinforcement, placing, finishing and curing, and overlays.

Keywords: admixtures; aggregate; air entrainment; bridge decks; concrete curing; concrete finishing; concrete overlays; concrete placing; cracking; durability; polymer concrete; reinforcing bars; scaling; shrinkage; skid resistance.

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  ICE paper
Posted by: siamakdie - 12-18-2013, 12:47 PM - Forum: Archive - No Replies

# Full title:Numerical modelling of group effects on the distribution of dragloads in pile foundations
# Author(s):C. J. Lee ; M. D. Bolton ; A. Al-Tabbaa
# Publisher: ICE
# Language: English

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  SCI P272 Modular Construction using light steel framing: An Architect's Guide
Posted by: bigone - 12-18-2013, 09:46 AM - Forum: Steel - Replies (1)

SCI P272 Modular Construction using light steel framing: An Architect's Guide

Author: by R.M. Lawson , P.J. Grubb , J. Prewer , P.J. Trebilcock | Size: 4 MB | Format: PDF | Quality: Original preprint | Publisher: The Steel Construction Institute | Year: 1999 | pages: 105 | ISBN: ISBN-10: 1859420966 ISBN-13: 978-1859420966

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SCI P272 Modular Construction using light steel framing: An Architect's Guide

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  Simplified Procedure for Evaluating Earthquake Loading on Pile
Posted by: Songoku - 12-17-2013, 09:09 PM - Forum: Archive - No Replies

Hi everibody, i need the following paper:

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Thanks in advance to all

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  IStructE Paper
Posted by: siamakdie - 12-16-2013, 11:55 AM - Forum: Archive - Replies (1)

# Full title: Wind turbine foundations - loading, dynamics and design
# Author(s):Bonnett, Danny
# Publisher: IStructE
# Language: English

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