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Displaying 1 - 25 of 45

Modern reassessment of the Citicorp Building design wind loads

June 15, 2020
Author(s)
Dat Duthinh
Following structural engineering practice of the 1970s, engineers designed the Citicorp Building for the action of wind in each of the structure’s principal axes. One problem they faced was how to determine design values by combining simultaneous wind

Blown away: Citicorp Center Tower repairs revisited

July 1, 2019
Author(s)
Dat Duthinh
Using Database-Assisted Design and the Tokyo Polytechnic University Aerodynamic Database, we show that face winds put more structural demand than corner winds do on the Citicorp Tower in Manhattan. This 59-story building, supported by four midside columns

Function VoronoiBound

November 30, 2018
Author(s)
Dat Duthinh, Brian M. Phillips
Matlab Function VoronoiBound calculates a Voronoi diagram with inner and outer bounds. This function is useful in defining tributary areas of pressure taps regularly or irregularly placed on the outside surface of a wind tunnel model.

Influence of wind tunnel test duration on wind load factors

August 17, 2018
Author(s)
Dat Duthinh, Adam L. Pintar, Emil Simiu
A methodology is presented for calculating the uncertainty associated with the estimation of peak pressure coefficients from wind tunnel test records of various lengths, and how this uncertainty affects design wind effects. Investigation of time series

Analysis of Wind Pressure Data on Components and Cladding of Low-Rise Buildings

December 1, 2017
Author(s)
Dat Duthinh, Joseph A. Main, Matthew L. Gierson, Brian M. Phillips
This paper presents a methodology for analyzing wind pressure data on cladding and components of low-rise buildings. The aerodynamic force acting on a specified area is obtained by summing up pressure time series measured at that area’s pressure taps times

Estimating peaks of stationary random processes: a peaks-over-threshold approach

December 1, 2017
Author(s)
Dat Duthinh, Adam L. Pintar, Emil Simiu
Estimating properties of the distribution of the peak of a stationary process from a single finite realization is a problem that arises in a variety of science and engineering applications. Further, it is often the case that the realization is of length T

WIND LOAD FACTORS FOR USE IN THE WIND TUNNEL PROCEDURE

December 1, 2017
Author(s)
Emil Simiu, Adam L. Pintar, Dat Duthinh, DongHun Yeo
A 2005 Skidmore Owings and Merrill report notes that the ASCE 7 Standard is incomplete insofar as it provides no guidance on wind load factors appropriate for use with the Standard’s wind tunnel procedure. The purpose of this paper is to contribute to such

Improving the Interface Between Thermal and Structural Finite-Element Analyses

February 19, 2017
Author(s)
Dat Duthinh, Abed M. Khaskia
One of the recommendations of the National Construction Safety Team for the Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1, 2005) is to enhance the capability of available computational software to predict

Structural Analysis of a High-Rise Composite Frame Exposed to Fire

February 19, 2017
Author(s)
Dat Duthinh, Kuldeep Prasad
This paper presents a simplified, planar analysis of World Trade Center Tower 1 (WTC1), starting from a computer simulation of the fire using computational fluid dynamics, and progressing through a thermal and a structural analysis of the damaged structure

Structural Design for Fire: A Survey of Building Codes and Standards

October 1, 2014
Author(s)
Dat Duthinh
This document is a critical assessment of building codes and standards pertaining to structural design for fire from the United States, Canada, European Union members, Japan, New Zealand and Australia. These countries were selected because of their

A nonlinear model for gusset plate connections

March 15, 2014
Author(s)
Dat Duthinh, Chiara Crosti
The investigation of the 2007 collapse of the I-35 W Bridge in Minnesota, United States, used very detailed nonlinear finite-element (FE) analysis, which is too difficult for routine design. On the other hand, simple guidelines amenable to hand

Corrosion Detection in Concrete Rebars Using a Spectroscopic Technique

January 11, 2014
Author(s)
Edward J. Garboczi, Paul E. Stutzman, Shuangzhen S. Wang, Nicos Martys, Dat Duthinh, Virgil Provenzano, Shin G. Chou, David F. Plusquellic, Jack T. Surek, Sung Kim, Robert D. McMichael, Mark D. Stiles, Ahmed M. Hassan
Detecting the early corrosion of steel in reinforced concrete is a goal that has been much pursued. Since 2010, NIST has been working on a large project to develop an electromagnetic (EM) probe that detects the actual corrosion products via spectroscopic

Discussion of “Review of Methods to Assess, Design for, and Mitigate Multiple Hazards” by Yue Li, Aakash Ahuja, and Jamie E. Padgett (J. Performance of Constructed Facilities, 26 104-117)

March 1, 2013
Author(s)
Dat Duthinh, Long T. Phan, Emil Simiu
The authors have performed a useful service by providing a broad perspective on multi-hazard engineering. The discussers would like to complement that perspective by noting two results of practical significance in the context of design for multiple hazards