Crack Opening Behavior of Concrete Reinforced with High Strength Reinforcing Steel

Amir Soltani,Kent A. Harries,Bahram M. Shahrooz 한국콘크리트학회 2013 International Journal of Concrete Structures and M Vol.7 No.4

A major difference between high-strength reinforcing steel and conventional steel in concrete is that the service-load steel stress is expected to be greater. Consequently, the service-load steel strains are greater affecting cracking behavior. A parametric study investigating crack widths and patterns in reinforced concrete prisms is presented in order to establish limits to the service-load steel stress and strain. Additionally, based on the results of available flexural tests, crack widths at service load levels were evaluated and found to be within presently accepted limits for highway bridge structures, and were predictable using current AASHTO provisions. A limitation on service-level stresses of fs≤ 414 MPa (60 ksi) is nonetheless recommended.

A Nonlinear Acoustic Technique for Crack Detection in Metallic Structures

Dutta, Debaditya,Sohn, Hoon,Harries, Kent A.,Rizzo, Piervincenzo SAGE Publications 2009 Structural health monitoring Vol.8 No.3

<P>A crack detection technique based on nonlinear acoustics is investigated in this study. Acoustic waves at a chosen frequency are generated using an actuating lead zirconate titanate (PZT) transducer, and they travel through the target structure before being received by a sensing PZT wafer. Unlike an undamaged medium, a cracked medium exhibits high acoustic nonlinearity which is manifested as harmonics in the power spectrum of the received signal. Experimental results also indicate that the harmonic components increase nonlinearly in magnitude with increasing amplitude of the input signal. The proposed technique identifies the presence of cracks by looking at the two aforementioned features: harmonics and their nonlinear relationship to the input amplitude. The effectiveness of the technique has been tested on aluminum and steel specimens. The behavior of these nonlinear features as crack propagates in the steel beam has also been studied.</P>

FlexibleSUSY 2.0: Extensions to investigate the phenomenology of SUSY and non-SUSY models

Athron, Peter,Bach, Markus,Harries, Dylan,Kwasnitza, Thomas,Park, Jae-hyeon,Stö,ckinger, Dominik,Voigt, Alexander,Ziebell, Jobst Elsevier 2018 Computer physics communications Vol.230 No.-

<P><B>Abstract</B></P> <P>We document major new features and improvements of FlexibleSUSY, a Mathematica and C++ package with a dependency on the external package SARAH, that generates fast and precise spectrum generators. The extensions presented here significantly increase the generality and capabilities of the FlexibleSUSY package, which already works with a wide class of models, while maintaining an elegant structure and easy to use interfaces. The FlexibleBSM extension makes it possible to also create spectrum generators for non-supersymmetric extensions of the Standard Model. The FlexibleCPV extension adds the option of complex parameters to the spectrum generators, allowing the study of many interesting models with new sources of C P violation. FlexibleMW computes the decay of the muon for the generated model and thereby allows FlexibleSUSY to predict the mass of the W boson from the input parameters by using the more precise electroweak input of { <SUB> G F </SUB> , <SUB> M Z </SUB> , <SUB> α em </SUB> } instead of { <SUB> M W </SUB> , <SUB> M Z </SUB> , <SUB> α em </SUB> } . The FlexibleAMU extension provides a calculator of the anomalous magnetic moment of the muon in any model FlexibleSUSY can generate a spectrum for. FlexibleSAS introduces a new solver for the boundary value problem which makes use of semi-analytic expressions for dimensionful parameters to find solutions in models where the classic two-scale solver will not work such as the constrained E <SUB> 6 </SUB> SSM. FlexibleEFTHiggs is a hybrid calculation of the Higgs mass which combines the virtues of both effective field theory calculations and fixed-order calculations. All of these extensions are included in FlexibleSUSY 2.0, which is released simultaneously with this manual.</P> <P><B>Program summary</B></P> <P> <I>Program title:</I> FlexibleSUSY </P> <P> <I>Program Files doi:</I> http://dx.doi.org/10.17632/kf7m8gn8vp.1 </P> <P> <I>Licensing provisions:</I> GPLv3</P> <P> <I>Programming language:</I> C++, Wolfram/Mathematica, FORTRAN, Bourne shell</P> <P> <I>Journal reference of previous version:</I> Comput.Phys.Commun. 190 (2015) 139–172</P> <P> <I>Does the new version supersede the previous version?:</I> Yes</P> <P> <I>Reasons for the new version:</I> Program extension including new models, observables and algorithms</P> <P> <I>Summary of revisions:</I> Extension to non-supersymmetric models (FlexibleBSM), complex parameters (FlexibleCPV), prediction of W boson mass from muon decay (FlexibleMW), calculation of anomalous magnetic moment of the muon (FlexibleAMU), semi-analytic boundary value problem solver (FlexibleSAS), improved hybrid Higgs mass calculation (FlexibleEFTHiggs).</P> <P> <I>Nature of problem:</I> Determining the mass spectrum, mixings and further observables for an arbitrary extension of the Standard Model, input by the user. The generated code must find simultaneous solutions to constraints that are specified at two or more different renormalization scales, which are connected by renormalization group equations forming a large set of coupled first-order differential equations.</P> <P> <I>Solution method:</I> Nested iterative algorithm and numerical minimization of the Higgs potential.</P> <P> <I>Restrictions:</I> The couplings must remain perturbative at all scales between the highest and lowest boundary condition. Tensor-like Lagrangian parameters of rank 3 are currently not supported. The automatic determination of the Standard Model-like gauge and Yukawa couplings is only supported for models that have the Standard Model gauge group S U <SUB> ( 3 ) C </SUB> × S U <SUB> ( 2 ) L </SUB> × U <SUB> ( 1 ) Y </SUB> as a gauge symmetry group factor. However, due to the modular nature of the generated code, adapting and extending it to overcome restrictions in scope is quite straightforward.</P>

A critical steel yielding length model for predicting intermediate crack-induced debonding in FRP -strengthened RC members

Jian-Guo Dai,Kent A. Harries,Hiroshi Yokota 국제구조공학회 2008 Steel and Composite Structures, An International J Vol.8 No.6

Yielding of the internal steel reinforcement is an important mechanism that influences the Intermediate Crack-induced debonding (IC debonding) behavior in FRP-strengthened RC members since the FRP is required to carry additional forces beyond the condition of steel yielding. However, rational design practice dictates an appropriate limit state is defined when steel yielding is assured prior to FRP debonding. This paper proposes a criterion which correlates the occurrence of IC debonding to the formulation of a critical steel yielding length. Once this length is exceeded the average bond stress in the FRP/concrete interface exceeds its threshold value, which proves to correlate with the average bond resistance in an FRP/concrete joint under simple shear loading. This proposed IC debonding concept is based on traditional sections analysis which is conventionally applied in design practice. Hence complex bond stress-slip analyses are avoided. Furthermore, the proposed model incorporates not only the bond properties of FRP/concrete interface but also the beam geometry, and properties of steel and FRP reinforcement in the analysis of IC debonding strength. Based upon a solid database, the validity of the proposed simple IC debonding criterion is demonstrated.

Bayesian analysis and naturalness of (Next-to-)Minimal Supersymmetric Models

Athron, Peter,Balazs, Csaba,Farmer, Benjamin,Fowlie, Andrew,Harries, Dylan,Kim, Doyoun Institute of Physics Pub 2017 The journal of high energy physics Vol.2017 No.10

Debonding monitoring of CFRP strengthened RC beams using active sensing and infrared imaging

Sohn, Hoon,Kim, Seung Dae,In, Chi Won,Cronin, Kelly E.,Harries, Kent Techno-Press 2008 Smart Structures and Systems, An International Jou Vol.4 No.4

This study attempts to develop a real-time debonding monitoring system for carbon fiber-reinforced polymer (CFRP) strengthened structures by continuously inspecting the bonding condition between the CFRP layer and the host structure. The uniqueness of this study is in developing a new concept and theoretical framework of nondestructive testing (NDT), in which debonding is detected without relying on previously-obtained baseline data. The proposed reference-free damage diagnosis is achieved based on the concept of time reversal acoustics (TRA). In TRA, an input signal at an excitation point can be reconstructed if the response signal measured at another point is reemitted to the original excitation point after being reversed in the time domain. Examining the deviation of the reconstructed signal from the known initial input signal allows instantaneous identification of damage without requiring a baseline signal representing the undamaged state for comparison. The concept of TRA has been extended to guided wave propagations within the CFRP-strengthened reinforced concrete (RC) beams to improve the detectibility of local debonding. Monotonic and fatigue load tests of large-scale CFRP-strengthened RC beams are conducted to demonstrate the potential of the proposed reference-free debonding monitoring system. Comparisons with an electro-mechanical impedance method and an inferred imaging technique are provided as well.

정상골격군에서의 연령에 따른 하악 전치부 치조골 두께의 차이

최해리윤,박원,전종국,김연환,손병화 대한치과교정학회 2007 대한치과교정학회지 Vol.37 No.3

Shapeshifting as Infrastructural Storytelling: Comics about the Taxibot’s Conflicting Narratives

Giada Peterle and Tina Harris Academy of Mobility Humanities 2024 Mobility Humanities Vol.3 No.1

What are the stories we tell about infrastructures and what stories do infrastructures tell (about) us? We propose a paper in a hybrid verbo-visual format, including comic-pages created by Giada Peterle and based on Tina Harris’s keynote at the 2022 GMHC conference, autoethnographic notes, and visuals collected during fieldwork. Through experimenting with graphic storytelling, we highlight examples of infrastructural revelation and concealment, drawing on the figure of the shapeshifter as both a metaphor and a method for mobilising infrastructural imagination. What unites shapeshifters in many of the stories and myths we read is how they are taken up in different ways; how they simultaneously present both the potential to improve human lives as well as produce fear due to their unpredictability. By focusing specifically on the narrative of one shapeshifting infrastructure—the Taxibot, a vehicle designed to cut down on carbon emissions and improve efficiency at airports—we use comics as a research practice for exploring this metaphor and developing a broader understanding of how mobile lives and imaginaries shape infrastructure (and vice versa). We argue that paying closer attention to storytelling can generate new understandings of the uneven nexus between infrastructures and mobile lives, weaving in our understanding of infrastructural im/mobilities.

Exchange: Explaining the Passage of Universal Healthcare in Thailand

Joseph Harris,Joel Sawat Selway 동아시아연구원 2020 Journal of East Asian Studies Vol.20 No.1

What explains the passage of Thailand's landmark universal healthcare (UHC) policy? In separate contributions, Selway and Harris emphasized the role of electoral rules and political parties, on one hand, and “professional movements” of developmentally minded state bureaucrats on the other. Which is correct? In this article, Selway and Harris respond to each other's work. While Selway agrees that the actions of the professional movement constitute an underappreciated necessary condition for universal healthcare in Thailand, he argues that Harris overstates the role of the movement in implementation. Harris defends his position and maintains that an institution-focused account is insufficient, arguing that the actions of Thailand's Rural Doctors’ Movement not only explain universal healthcare but also gave rise to the very electoral rule changes that Selway argues were so critical to facilitating universal coverage. Selway responds to these criticisms, and the two researchers jointly consider implications for causation, qualitative research, and policymaking theory.

FOREIGN DIRECT INVESTMENT AND COUNTRY RISK: FURTHER EMPIRICAL EVIDENCE

Harri Ramcharran The Institute of East and West Studies 1999 Global economic review Vol.28 No.3

Global political and economic changes over the last decade have resulted into massive capital inflows to developing countries, most of these flows of civil wars, illegal capital flight, financial market instability, and political corruption, etc. further assessment of country risk is warranted. We examine the relationship between FDI and political and economic risks for 26 countries for the years 1992, 1993, and 1994 by using regression analysis and cross section data. The results indicate a significant relationship between FDI and these risks. This study provides more reliable estimates by using a current and eclectic measurement of risks represented by Euromoney indexes of political and economic risks. In the previous studies the perception of risk was narrowly defined and also political instability events were mistakenly interpreted as political risks.