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Displaying 5376 - 5400 of 13218

Database-Assisted Design for Wind: Veering Effects on High-Rise Structures

August 15, 2010
Author(s)
Dong Hun Yeo, Emil Simiu
… speed direction as a function of height above the surface. In this study a procedure is developed within a … on tall build-ing design. The procedure was applied in a case study of a 60-story reinforced concrete building, … Building technology, database-assisted design, mean recurrence …

High-Rise Database-Assisted Design 1.1 (HR_DAD_1.1): Concepts, Software, and Examples

February 2, 2009
Author(s)
Seymour M. Spence
… world tall buildings made up of many thousands of members. In particular the following upgrades on the previous software … requiring times of the order of hours, of the peak demand in each member of a real size structure (estimated time for … Building technology, multi-hazard engineering, structural engineering, …

Economical Mixtures to Reduce Both Thermal and Autogenous Shrinkage Contributions to Early-Age Cracking

July 2, 2008
Author(s)
Dale P. Bentz, Max A. Peltz
… shrinkage that often occurs during the same timeframe. In this paper, three potential alternatives for reducing … by increasing the interparticle spacing between grains in the three-dimensional microstructure. These reductions are … to indicate the strength tradeoff that will be experienced in reducing the risk of early-age cracking. These mixtures …

Mixture Proportioning for Internal Curing

February 1, 2005
Author(s)
Pietro Lura, J W. Roberts
… by chemical shrinkage during the hydration of the cement. In addition to the original concrete's mixture proportions, … building technology, chemical shrinkage, hydration, internal curing, …

Sampling Errors in the Estimation of Peak Wind-Induced Internal Forces in Low-Rise Structures

February 1, 2004
Author(s)
Fahim Sadek, S M. Diniz, M Kasperski, M Gioffre, Emil Simiu
… Peak values in time histories of wind effects may be obtained by using the entire information inherent in the time series of the wind effect, a method entailing the … reliability calculations, of the sampling errors inherent in this method. If based on the analysis of one-hour long …

Discussion of Definition of Wind Profiles in ASCE 7 by Yin Zhou and Ahsan Kareem

November 1, 2003
Author(s)
Emil Simiu, Fahim Sadek, Michael A. Riley
… The discussion presents a critique of a paper published in the Journal of Structural Engineering, Aug. 2002, pp. … building technology, logarithmic law, power law meteorology structural … Discussion of Definition of Wind Profiles in ASCE 7 by Yin Zhou and Ahsan Kareem …

Comparison of Measured and Predicted Tracer Gas Concentrations in a Townhouse

August 1, 2003
Author(s)
Steven J. Emmerich, Steven J. Nabinger, A Gupte, Cynthia H. Reed, L A. Wallace
… and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF6), was … of the house and the concentration of SF6 was measured in each zone. This same process was then recreated in CONTAMW …

Validation of CONTAMW Predictions for Tracer Gas in a Townhouse

August 1, 2003
Author(s)
Steven J. Emmerich, Steven J. Nabinger, A Gupte, Cynthia H. Reed
… and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF 6 ), was … of the house and the concentration of SF 6 was measured in each zone. This same process was then recreated in CONTAMW …

Wind Speeds in ASCE 7 Standard Peak-Gust Map: Assessment

April 1, 2003
Author(s)
Emil Simiu, R Wilcox, Fahim Sadek, James J. Filliben
… reasons: (a) The estimation of the speeds specified in the map was originally based on the use of superstations so composed that, in 80 percent of the cases, component stations belong to more than one superstation; (b) superstations were in many instances composed of stations with different …

Wind Speeds in the ASCE 7 Standard Peak-Gust Map: An Assessment

April 1, 2003
Author(s)
Emil Simiu, R Wilcox, Fahim Sadek, James J. Filliben
… reasons: (a) The estimation of the speeds specified in the map was originally based on the use of superstations so composed that, in 80 percent of the cases, component stations belong to more than one superstation; (b) superstations were in many instances composed of stations with different …

Fragility Curves, Damage Matrices, and Wind-Induced Loss Estimation

June 1, 2002
Author(s)
James J. Filliben, K Gurley, J P. Pinelli, Emil Simiu, M Subramanian
… The framework is designed with two considerations in mind. First, losses due to multiple types of damage are … over a larger geographical area. The framework developed in the paper is illustrated for the conceptually simple case of two basic damage states. Work is in progress on the application of the framework to various …

Quantum Efficiency of Spectral UV on Polyurethanes

March 1, 2002
Author(s)
Tinh Nguyen, Jonathan W. Martin, E Byrd, E Embree
… different UV wavelength ranges from 290 nm to 540 nm. In addition, specimens exposed in the absence of UV and under 300 nm cut-on filters were … cells containing twelve windows (11 filters and one in the absence of light) corresponding to 12 specimens were … building technology, coatings, degradation, FTIR, photodegradation, …

Characterization of Chemical Heterogeneity in Polymer Systems Using Hydrolysis and Tapping Mode Atomic Force Microscopy

July 1, 2001
Author(s)
D Ragahavan, X. Gu, Tinh Nguyen, Mark R. VanLandingham
… fundamental understanding of corrosion of coated metals. In this paper an approach for mapping chemical heterogeneity … is based on selective hydrolysis of one of the phases in a multi-phase polymer blend system and the ability of … nanoscale lateral information about the different phases in the polymer system. Films made of 70:30 polyethyl …

Extreme Wind Load Estimates Based on the Gumbel Distribution of Dynamic Pressures: An Assessment

July 1, 2001
Author(s)
Emil Simiu, A N. Heckert, James J. Filliben, Steven K. Johnson
… sets of data we believe are typical, this is not the case. In addition, we show results of probability plot correlation … pressures. We interpret the data and results presented in the paper as indicating that there is no convincing … building technology, extreme value statistics, structural engineering, …

Curing of High-Performance Concrete for Strength: Phase I Study

April 1, 2001
Author(s)
Nicholas J. Carino, K W. Meeks
… was assumed to be representative of the paste system in a high-performance concrete. Specimens were moist cured … cylinders were sealed to simulate one-dimensional drying in a large member. Tensile strengths were measured at 28 d. … building technology, curing, high-performance concrete, mortar, …

Curing of High-Performance Concrete for Strength-What is Sufficient?

September 1, 2000
Author(s)
Nicholas J. Carino, K W. Meeks
… was assumed to be representative of the paste system in a high-performance concrete. Specimens were moist cured … cylinders were sealed to simulate one-dimensional drying in a large member. Tensile strengths were measured at 28 d. … building technology, curing, high-performance concrete, mortar, …

Effect of Drying Shrinkage Cracks and Flexural Cracks on Concrete Bulk Permeability

May 1, 2000
Author(s)
Kenneth A. Snyder
… The analysis is repeated using a Monte Carlo approach in order to assess the effects of input parameter variability.The principles outlined in this report will be incorporated into the 4sight computer … designs. The mean values reported will assist the user in determining which factors have the greatest effect on the …
Displaying 5376 - 5400 of 13218
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