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Full-Text Articles in Engineering Science and Materials

Hierarchical Multiscale Modeling To Inform Continuum Constitutive Models Of Soils, Erik Wallace Jensen Jan 2017

Hierarchical Multiscale Modeling To Inform Continuum Constitutive Models Of Soils, Erik Wallace Jensen

Civil Engineering Graduate Theses & Dissertations

The behavior of soils is fundamentally the combined interactions between billions and billions of individual particles and particle matrices. For computational tractability and despite this fact, many soil models assume the material is a continuum essentially averaging the inter-particle interactions to predict the behavior of the bulk material. In recent years, multiscale modeling techniques have been developed to reintroduce the effect of the grain-scale interactions to help model situations where the continuum assumption fails, such as shear band development in triaxial tests or soil disaggregation under blast loading. One of such multiscale models called hierarchical upscaling, or global-local analysis, model ...


Confined Masonry: Theoretical Fundamentals, Experimental Test, Finite Element Models, And Future Uses, Lan T. Nguyen Jan 2014

Confined Masonry: Theoretical Fundamentals, Experimental Test, Finite Element Models, And Future Uses, Lan T. Nguyen

Civil Engineering Graduate Theses & Dissertations

Inspired from the MS thesis that investigated the underlying relationship between the implicit level of risk accepted for natural hazards and the level of economic, social and political development of Haiti, a developing country, this dissertation focuses structurally on the use of low-rise confined masonry (CM) buildings in natural hazard consideration areas. The research emphasizes the responses of the CM shear wall structure as a whole, as well as the material conditions in detail. Key findings are presented from experimental tests, computational modeling procedures, analytical results, and reliability analysis for CM structures followed with the summary of the behavior of ...


The Effect Of Temperature On Moisture Transfer In Concrete, Yao Wang Jan 2014

The Effect Of Temperature On Moisture Transfer In Concrete, Yao Wang

Civil Engineering Graduate Theses & Dissertations

Moisture transfer is a major concern for predicting the durability and serviceability of concrete. To predict moisture transfer in concrete, one should not only analyze the effect of moisture gradient, but also consider the effect of temperature gradient. This effect is called Soret effect. Moreover, depending on the experimental results, the value of coefficient was calculated and used to quantify the Soret effect.

This thesis presents results of an experimental investigation of how the temperature gradient affects the moisture in concrete. The thesis includes two major parts. The first part introduces the background information as well as the theoretical review ...


Thermal Strain Of Concrete Under Low Temperatures And Durability And Processing Techniques Of Concrete With Cnts, Xingang Wang Jan 2013

Thermal Strain Of Concrete Under Low Temperatures And Durability And Processing Techniques Of Concrete With Cnts, Xingang Wang

Civil Engineering Graduate Theses & Dissertations

This thesis consists of two topics: Thermal strain of concrete under low temperatures, and durability and processing techniques of concrete with CNTs. The low temperature test studies the anti-freezing action of concrete under cooling environment. Concrete mixes using different amounts of air-entraining agent and water/cement ratios were made and cured under different humidity environments. During the cooling process from 10 ºC to -25 ºC, the strain of concrete was measured every 3~5 ºC. The strain-temperature curve of concrete under different mixing proportion was produced from these results. A numerical model was developed based on the theory of the ...


Model Development And Experimental Validation Of Pressure Independent Hydronic Circuits, Justin Thomas Bellucci Jan 2012

Model Development And Experimental Validation Of Pressure Independent Hydronic Circuits, Justin Thomas Bellucci

Civil Engineering Graduate Theses & Dissertations

Computer modeling is quickly becoming a more accessible method to evaluate the performance of complex building systems, due in part to the recent advance in computing power over the last decade. Rising energy costs, stricter building codes, the threat of global climate change and governmental pressure have all influenced building owners, architects, engineers and system operators to design and operate the world's building stock in a more energy efficient manner. Particularly important in large buildings and campuses are the hydronic flow networks that deliver chilled water to the cooling coils in air handling units for the purpose of regulating ...