bluuebunny/crossref_metadata_2025 huggingface dataset:
A Simulative Study on Active Disturbance Rejection Control (ADRC) as a Control Tool for Practitioners
Authors: Herbst Gernot
Published: August 2013

As an alternative to both classical PID-type and modern model-based approaches to solving control problems, active disturbance rejection control (ADRC) has gained significant traction in recent years. With its simple tuning method and robustness against process parameter variations, it puts itself forward as a valuable addition to the toolbox of control engineering practitioners. This article aims at providing a single-source introduction and reference to linear ADRC with this audience in mind. A simulative study is carried out using generic first- and second-order plants to enable a quick visual assessment of the abilities of ADRC. Finally, a modified form of the discrete-time case is introduced to speed up real-time implementations as necessary in applications with high dynamic requirements.
Islanding Detection Method of a Photovoltaic Power Generation System Based on a CMAC Neural Network
Authors: Chao Kuei-Hsiang , Yang Min-Sen , Hung Chin-Pao
Published: August 2013

This study proposes an islanding detection method for photovoltaic power generation systems based on a cerebellar model articulation controller (CMAC) neural network. First, islanding phenomenon test data were used as training samples to train the CMAC neural network. Then, a photovoltaic power generation system was tested with the islanding phenomena. Because the CMAC neural network possesses association and induction abilities and characteristics that activate similar input signals in approximate memory during training process, the CMAC only requires that the weight values of the excited memory addresses be adjusted, thereby reducing the training time. Furthermore, quantification of the input signals enhanced the detection tolerance of the proposed method. Finally, the simulative and experimental data verified the feasibility of adopting the proposed detection method for islanding phenomena.
Protein Structures among Bio-Ethanol Co-Products and Its Relationships with Ruminal and Intestinal Availability of Protein in Dairy Cattle
Authors: Azarfar Arash , Jonker Arjan , Yu Peiqiang
Published: August 2013

The objectives of this study were to reveal molecular structures of protein among different types of the dried distillers grains with solubles (100% wheat DDGS (WDDGS); DDGS blend1 (BDDGS1, corn to wheat ratio 30:70%); DDGS blend2 (BDDGS2, corn to wheat ratio 50:50 percent)) and different batches within DDGS type using diffuse reflectance infrared Fourier transform spectroscopy (DRIFT). Compared with BDDGS1 and BDDGS2, wheat DDGS had higher (p < 0.05) peak area intensities of protein amide I and II and amide I to II intensity ratio. Increasing the corn to wheat ratio form 30:70 to 50:50 in the blend DDGS did not affect amide I and II area intensities and their ratio. Amide I to II peak intensity ratio differed (p < 0.05) among the different batches within WDDGS and BDDGS1. Compared with both blend DDGS types, WDDGS had higher α-helix and β-sheet ratio (p < 0.05), while α-helix to β-sheet ratio was similar among the three DDGS types. The α-helix to β-sheet ratio differed significantly among batches within WDDGS. Principal component analysis (PCA) revealed that protein molecular structures in WDDGS differed from those of BDDGS1 and between different batches within BDDGS1 and BDDGS2. The α-helix to β-sheet ratios of protein in all DDGS types had an influence on availability of protein at the ruminal level as well as at the intestinal level. The α-helix to β-sheet ratio was positively correlated to rumen undegraded protein (r = 0.41, p < 0.05) and unavailable protein (PC; r = 0.59, p < 0.05).
ACE Inhibition with Captopril Retards the Development of Signs of Neurodegeneration in an Animal Model of Alzheimer’s Disease
Authors: AbdAlla Said , Langer Andreas , Fu Xuebin , Quitterer Ursula
Published: August 2013

Increased generation of reactive oxygen species (ROS) is a significant pathological feature in the brains of patients with Alzheimer’s disease (AD). Experimental evidence indicates that inhibition of brain ROS could be beneficial in slowing the neurodegenerative process triggered by amyloid-beta (Abeta) aggregates. The angiotensin II AT1 receptor is a significant source of brain ROS, and AD patients have an increased brain angiotensin-converting enzyme (ACE) level, which could account for an excessive angiotensin-dependent AT1-induced ROS generation. Therefore, we analyzed the impact of ACE inhibition on signs of neurodegeneration of aged Tg2576 mice as a transgenic animal model of AD. Whole genome microarray gene expression profiling and biochemical analyses demonstrated that the centrally active ACE inhibitor captopril normalized the excessive hippocampal ACE activity of AD mice. Concomitantly, the development of signs of neurodegeneration was retarded by six months of captopril treatment. The neuroprotective profile triggered by captopril was accompanied by reduced amyloidogenic processing of the amyloid precursor protein (APP), and decreased hippocampal ROS, which is known to enhance Abeta generation by increased activation of beta- and gamma-secretases. Taken together, our data present strong evidence that ACE inhibition with a widely used cardiovascular drug could interfere with Abeta-dependent neurodegeneration.
Wireless Sensor Network Operating System Design Rules Based on Real-World Deployment Survey
Authors: Strazdins Girts , Elsts Atis , Nesenbergs Krisjanis , Selavo Leo
Published: August 2013

Wireless sensor networks (WSNs) have been a widely researched field since the beginning of the 21st century. The field is already maturing, and TinyOS has established itself as the de facto standard WSN Operating System (OS). However, the WSN researcher community is still active in building more flexible, efficient and user-friendly WSN operating systems. Often, WSN OS design is based either on practical requirements of a particular research project or research group's needs or on theoretical assumptions spread in the WSN community. The goal of this paper is to propose WSN OS design rules that are based on a thorough survey of 40 WSN deployments. The survey unveils trends of WSN applications and provides empirical substantiation to support widely usable and flexible WSN operating system design.
Breathing Some New Life into an Old Topic: Chalcogen-Nitrogen π-Heterocycles as Electron Acceptors
Authors: Lonchakov Anton , Rakitin Oleg , Gritsan Nina , Zibarev Andrey
Published: August 2013

Recent progress in the design, synthesis and characterization of chalcogen-nitrogen π-heterocycles, mostly 1,2,5-chalcogenadiazoles (chalcogen: S, Se and Te) and their fused derivatives, possessing positive electron affinity is discussed together with their use in preparation of charge-transfer complexes and radical-anion salts—candidate building blocks of molecule-based electrical and magnetic functional materials.
A Comparison of Retinyl Palmitate and Red Palm Oil β-Carotene as Strategies to Address Vitamin A Deficiency
Authors: Souganidis Ellie , Laillou Arnaud , Leyvraz Magali , Moench-Pfanner Regina
Published: August 2013

Vitamin A deficiency continues to be an international public health problem with several important health consequences including blindness and overall increased rates of morbidity and mortality. To address this widespread issue, a series of strategies have been put into place from dietary diversification to supplementation and fortification programs. Retinyl palmitate has been used successfully for decades as a supplement as well as a way to fortify numerous foods, including vegetable oil, rice, monosodium glutamate, cereal flours and sugar. Recently, there has been rising interest in using a natural source of carotenoids, β-carotene from red palm oil (RPO), for fortification. Although RPO interventions have also been shown to effectively prevent Vitamin A deficiency, there are numerous challenges in using beta-carotene from RPO as a fortification technique. β-Carotene can induce significant changes in appearance and taste of the fortified product. Moreover, costs of fortifying with beta-carotene are higher than with retinyl palmitate. Therefore, RPO should only be used as a source of Vitamin A if it is produced and used in its crude form and regularly consumed without frying. Furthermore, refined RPO should be fortified with retinyl palmitate, not β-carotene, to ensure that there is adequate Vitamin A content.
Integration of Metal Oxide Nanowires in Flexible Gas Sensing Devices
Authors: Comini Elisabetta
Published: August 2013

Metal oxide nanowires are very promising active materials for different applications, especially in the field of gas sensors. Advances in fabrication technologies now allow the preparation of nanowires on flexible substrates, expanding the potential market of the resulting sensors. The critical steps for the large-scale preparation of reliable sensing devices are the elimination of high temperatures processes and the stretchability of the entire final device, including the active material. Direct growth on flexible substrates and post-growth procedures have been successfully used for the preparation of gas sensors. The paper will summarize the procedures used for the preparation of flexible and wearable gas sensors prototypes with an overlook of the challenges and the future perspectives concerning this field.
Are Young Women and Men with Rheumatoid Arthritis at Risk for Fragility Fractures? A Population-based Study
Authors: Amin Shreyasee , Gabriel Sherine E. , Achenbach Sara J. , Atkinson Elizabeth J. , Melton L. Joseph
Published: August 2013

Objective.

Older women and men with rheumatoid arthritis (RA) are at increased risk for fractures, but limited information is available on fracture risk in younger individuals with RA and whether such risk occurs early in the disease onset or only when older. We determined the risk for fractures in both young and older women and men following RA diagnosis.

Methods.

We studied a population-based inception cohort with RA from Olmsted County, Minnesota, USA. We identified 822 women and 349 men diagnosed with RA between 1955 and 2007 (308 women and 110 men diagnosed before age 50) and an equal number of paired non-RA subjects, matched by sex and birth year. Incident fractures were collected through review of complete (inpatient and outpatient) medical records available through the linkage system of the Rochester Epidemiology Project.

Results.

The hazard ratio (HR; 95% CI) for a non-pathologic fracture occurring from no more than moderate trauma was 1.63 (1.36–1.96) for women and 1.40 (1.02–1.93) for men with RA. Findings were consistent for women and men diagnosed with RA at age ≥ 50 years [HR, 1.43 (1.16–1.77) and 1.34 (0.92–1.94), respectively], or at age < 50 years [HR, 2.34 (1.61–3.42) and 1.74 (0.91–3.30), respectively]. However, young women, but not young men, with RA were at increased fracture risk even before age 50 years (HR, 1.95 [1.08–3.51] and 0.82 [0.28–2.45], respectively).

Conclusion.

Young men with RA are at increased risk for fractures only when older, whereas young women with RA have an elevated fracture risk even while still young.
Ephedra increases VO2, impairs thermoregulation and cardiovascular function, but does not enhance exercise performance
Authors: Norton R.P. , Lehnhard R.A. , Kearns C.F. , McKeever K.H.
Published: August 2013

The dietary supplement ephedra is a potent sympathomimetic that was banned by the US Food and Drug Administration in 2003 because of its deleterious effects on cardiovascular function and thermoregulation during exercise. Unfortunately, extracts of ephedra can still be obtained via the internet and are in use worldwide. The horse is the only athletic species other than humans that sweats to thermoregulate and it controls cardiovascular function in a similar fashion. The purpose of this study was to use the horse to examine the acute effects of ephedra (Ma Huang) to investigate on markers of performance as well as effects on cardiovascular function and thermoregulation during acute exercise. Six Standardbred mares (~450 kg; 6-12 years of age) were used in a crossover design consisting of a ephedra (Ma Huang containing 8% ephedra alkaloid) and control (applesauce) group. All horses performed an incremental graded exercise test (GXT) at a 6% fixed grade to measure oxygen uptake (VO2), run time, velocity at VO2max, maximal velocity, recovery time, haematocrit, total plasma protein concentration, heart rate, right ventricular pressure (RVP), pulmonary arterial pressure (PAP), rectal temperature and recovery. Measurements were recorded at rest, during exercise and post 2 and 5 min recovery. There was a difference (P<0.05) in pre-exercise haematocrit but not in any other haematocrit or plasma protein sampling intervals. VO2 was greater (P<0.05) for the ephedra group before exercise, at each step of the GXT, at VO2max, and during recovery compared to the control group. Recovery time was significantly different, but run time was not (P≯0.05). Heart rate was elevated (P<0.05) at 2 and 5 min recovery in horses administered ephedra. Significant differences were observed for RVP and PAP and rectal temperature during recovery. Recovery score (sweating response, respiration rate, behaviour) was altered (P<0.05) by ephedra administration. These data suggests an increase in energy expenditure and thermogenesis when horses consume ephedra. However, markers of performance (run time, velocity at VO2max, and maximal velocity completed) were not altered by ephedra administration.
Integrating Care of Older Adults Into the Nursing Curriculum: A Case Exemplar Project
Authors: Abendroth Maryann , Graven Lucinda J.
Published: August 2013

The growing number of older adults in the United States necessitates that nurses be prepared to care for this population. A case exemplar was created for use in a baccalaureate nursing program to prepare students for care of older adults in multiple settings, as well as to heighten interprofessional health care partnerships. The case exemplar follows the character, Mrs. Gates, in a scenario throughout the program. Another character, Mrs. Strokes, is introduced in a high-fidelity laboratory simulation activity for more advanced students. The case scenario uses a team approach to care and includes activities that optimize critical thinking. This article describes the process of creating a case exemplar, including project pilot testing, and the potential for interprofessional education. The incorporation of case exemplars such as these can enhance the teaching–learning process, thereby improving care for older adults and their families. [
J Nurs Educ.
2013;52(9):529–532.]
Résultats du sondage EPTiES (English Pronunciation Teaching in Europe Survey) : l’enseignement de la prononciation dans plusieurs pays européens vu par les enseignants
Authors: Frost Dan , Henderson Alice
Published: August 2013

Cet article a pour but de présenter certains résultats d’une étude sur l’enseignement de la prononciation dans plusieurs contextes européens ainsi que de discuter des implications de ces résultats. Ce projet est le fruit d’un travail collaboratif entre des enseignants de dix pays européens (Allemagne, Espagne, Finlande, France, Pays-Bas, Irlande, Macédoine, Pologne, Suède et Suisse). Nous présentons ici les résultats d’un questionnaire (843 participants), ainsi que quelques extraits des entretiens semi-structurés que nous avons réalisés. Le questionnaire s’appuie sur d’autres travaux menés dans le domaine (Walker 1999 ; Burgess & Spencer 2000 ; Breitkreutz, Derwing & Rossiter 2002 ; Macdonald 2002).Nous nous concentrons dans cet article sur les thèmes suivants : les compétences et la formation des enseignants, ainsi que le niveau et les motivations des apprenants.
Pour une réflexion disciplinaire sur l’éthique professionnelle des enseignants de langue-culture
Authors: Antier Emmanuel
Published: August 2013

Si la réflexion sur l’éthique professionnelle des enseignants est actuellement en plein essor en sciences de l’éducation, elle apparaît en revanche peu développée en didactique des langues-cultures. À travers la mise en évidence de certaines particularités éthiques inhérentes à l’enseignement-apprentissage des langues-cultures, nous plaidons ici pour la mise en place d’une réflexion disciplinaire sur l’éthique professionnelle des enseignants de langue-culture.
Mise au point sur l’éthique dans les séries télévisées à substrat juridique
Authors: Chapon Sandrine
Published: August 2013

« Nous ne sommes pas comme les autres cabinets d’avocats. Tout n’est pas fait pour l’argent, le pouvoir et l’ego. Cela mobilise seulement 86 % de notre énergie » (The Firm, saison 1, épisode 5). Est-il acceptable, dans notre posture de concepteur de dispositifs pédagogiques de didactiser des documents qui entretiennent des stéréotypes négatifs de la culture professionnelle cible, comme dans l’exemple ci-dessus ? Cet article présente l’image de l’avocat plaidant dans les séries télévisuelles américaines du point de vue de la déontologie. Après avoir observé les traits caractéristiques des héros contemporains par opposition avec l’image de l’avocat des années cinquante, nous analysons comment les entorses à la déontologie, véhiculées par la fiction, peuvent être utilisées pour construire notre vision du monde professionnel. Enfin nous montrons quels procédés narratifs sont utilisés pour garantir que le récepteur de la fiction ne puisse imaginer que l’univers diégétique est un reflet fidèle des pratiques professionnelles.
Itinéraires dans la périurbanité « molle » : entre tout-fonctionnel et résistance
Authors: Chauvier Eric
Published: August 2013

Si l’on évoque quelquefois la  « mollesse »  des zones périurbaines pavillonnaires, ce jugement tient surtout à un défaut d’investigation. Cette contribution vise à montrer l’ambivalence de ces modes de vie méconnus au niveau anthropologique : fortement standardisés, ils comportent aussi des formes de résistance insoupçonnées. Il reste cependant à apprendre à découvrir ces interstices de vie périurbaine.
The social construction of real estate market risk. The case of a financial investments cluster in Mexico City
Authors: David Louise
Published: August 2013

This article contributes to the study of the geographical concentration of financial investments in real estate markets. It demonstrates the social construction process at work in the evolution of real estate market risks. The objective is to highlight the conditions that allow or impede the implementation of ‘opportunistic’ and ‘conservative’ risk strategies. By analyzing the market entry of financial investors in the Cuautitlan industrial real estate market - an ‘emerging’ real estate market in Mexico City - this paper demonstrates that, due to the joint action of land developers, non-financial as well as financial real estate investors, this market moved from being ‘too risky’ to becoming an opportunistic market, and then a conservative one. There were two important phases in the transformation process. First, the contribution of land developers was fundamental to the transformation of the market from being too risky to being opportunistic from the perspective of financial investors. Two different types of land developers are evident: some are not willing to help financial investors’ entry in the market while others developed a business plan designed to facilitate financial investments. In the second phase of the market’s risks transformation, opportunistic financial investors enabled the conditions for the arrival of conservative financial investors, thanks to their presence in emerging markets and the diffusion of information.
Damage Detection for Cantilever Beam Structures Using Two-Stage Method
Authors: Li Cui Hong , Yang Qiu Wei , Shen Xue
Published: August 2013

This paper presents a two-stage method for damage identification in cantilever beam structures using the incomplete measured static and dynamic paramenters. The first stage locates damages preliminary by using the static displacement changes, which is obtained by the static test of structure. It has been shown that the point from which the static displacement difference starts increasing linearly is the location of damage. After the suspected damaged elements are determined in the first stage, the first order sensitivity of the structural natural frequency is used to identify damages more precise in the second stage. The significant advantage of the proposed method is that it is economical in computation and is simple to implement. A cantilever beam structure is analyzed as a numerical example to verify the present method. Results show that the proposed method performs well even if the measurement errors inevitably make the damage assessment more difficult. It has been shown that the presented two-stage methodology may be a promising tool to be used by research groups working on experimental damage detection.
Comparative Study of Model Test and Numerical Analysis on the Temperature Monitoring of Mass Concrete Raft Foundation
Authors: Sun Wei , Wang Qiang , Ge Chao
Published: August 2013

A high-rise building with an 11 meters thick raft foundation will be built in Shenyang, which will bring a huge challenge to construction on site. To avoid temperature crack affecting construction quality, a comparative study of model test and numerical analysis about temperature monitoring are carried out to determine the construction measures for the mass concrete mat foundation. The results show that the development of temperature field of inner concrete can be divided into three stages: growing rapidly, cooling fast and cooling steadily. Different temperature control measures should be used for different temperature developing stages. The results of the model test and numerical analysis in the paper will provide technical supports to the temperature control on site.
Design and Implement of the Urban Bridge Cluster Monitoring Online Assessment System
Authors: Xi Ling Zhi , Li Yi , Zhou Chang
Published: August 2013

Bridge health monitoring system (BHMS) is a package of technologies for structural monitoring, control, maintenance and management. Making use of the fusion of technologies from different disciplines, such as sensing, communication, signal processing, system identification, etc., the system is empowered to simultaneously get all kinds of information which reflect the safety conditions of bridge structure, and provide scientific proof for the analysis of bridge health. The assessment method is the core of the BHMS. In the conventional assessment procedure, there is significant influence of subjective factors involved. A feasibility study on the use of fuzzy comprehensive evaluation method in the bridge condition assessment is presented in this paper. The applications of fuzzy mathematics in condition assessment of bridges were discussed. Based on the research of present methods, analytical hierarchy process and fuzzy mathematics were integrated and applied in condition assessment of the project of main roads bridge Online Safety Monitoring Management System in Hangzhou (Phase II), a web-based urban bridge cluster monitoring system have been established. From a continuous beam bridge case study, it is observed that the fuzzy comprehensive evaluation method is capable of simulating the bridge condition evaluation process and has a good application.
A Study on the Quality Assessment System of Reinforced Concrete-Skein Reinforcement Method to Arch Bridges
Authors: Li Guo Ming , Rui Jie , Wang Bing , Wang Zong Ren
Published: August 2013

For reinforced concrete skein method to arch bridges, corresponding quality assessment system is established based on analytic hierarchy process (AHP). At the same time, the actual application process of the system was found. Structure of judging matrix, synthetic weight and for each layer of element and fuzzy comprehensive evaluation was figured out. Finally, the system is verified by practical engineering. Something is obvious as the result shows. Firstly, the comprehensive assessment system for reinforcement quality of bridges is reasonable and practical. Secondly, this system takes some advantages to the systematization, standardization and theorization for the assessment to reinforcement quality of bridges.
Test on Slip Coefficient of High-Strength Bolted Slip-Critical Connections after Fire
Authors: Zhu Mei Chun , Jiang Yan Jun , Lou Guo Biao , Li Guo Qiang
Published: August 2013

Fire safety is a major concern with steel structures. Actually, steel structures were not fatally destroyed in most cases of fire. These damaged steel structures may be reused after structural inspection, safety appraisal and necessary repair. Bolted connections are the most widely used connection in steel structures. Slip coefficient is a key parameter to calculate the slip bearing capacity of bolted slip-critical connections. Currently there are few research results available about slip coefficient of bolted slip-critical connections after fire. To obtain the effect of heating and cooling on slip coefficient, a series of slip load tests on connections that had been heated and cooled to ambient temperature were carried out in this study. Methods of friction surface treatment included shot blast and painting inorganic zincs after shot blast. Test results show that heating and cooling have a great effect on slip coefficient of connections with two methods of friction surface treatment, among which effect on connections with shot blasting surfaces is more significant.
Finite Element Modelling of Concrete-Filled Steel Tube Reinforced Concrete Stub Columns under Axial Compression
Authors: Wang Zhi Bin , Liu Li Ying
Published: August 2013

Concrete-filled steel tube reinforced concrete (CFSTRC) columns are currently being studied as a popular method to improve the shear strength, the ductility and the seismic behaviour of reinforced concrete (RC) columns. Owing to the complexity of confinement provided by steel tubes and stirrups, the behaviour of CFSTRC column is difficult to be accurately simulated. Thus,so far there is not a finite element (FE) model for CFSTRC columns. For studying the performance of this composite column, a FE model was developed based on the existing test results and theories. The predicted results using this FE model agree with the test results, which means that this model can be applied to carry out the further mechanism analysis.
Temporary Preventive Seismic Reinforcements on Historic Churches: Numerical Modeling of San Frediano in Pisa
Authors: de Falco Anna , Giresini Linda , Sassu Mauro
Published: August 2013

The idea to apply temporary and precautionary seismic reinforcements to protect artistic assets in historical buildings is hereby presented. The example of the San Frediano Church in Pisa is addressed to show the improvements in its seismic response due to steel wire ropes applied to arches and columns. Numerical analysis demonstrate the reduction of the shear force at the base of the stone columns. The proposed reinforcements are reversible, temporary and with low aesthetic impact: they can be quickly installed in the beginning of seismic events, as an evolution of the techniques adopted after the last Italian earthquakes (Abruzzo 2009 Emilia 2012).
Seismic Damage Causes and Strengthening Methods of Museum Free-Standing Cultural Relics
Authors: Ji Jin Bao , Yan Wei Ming , Zhou Qian
Published: August 2013

To protect museum cultural relics, seismic damage causes as well as aseismic strengthening methods of free-standing museum cultural relics were studied in this paper. Museums, cultural relics and their bases were all considered to study causes of damage of free-standing relics. Shortages of typical domestic aseismic methods were discussed, overseas isolation techniques were introduced. Based on 2 typical examples, reasonable strengthening methods for museum cultural relics were further demonstrated. Results show that main damage causes of museum cultural relics under earthquakes relate closely to over strong earthquake intensity, shortage of strengthening measures of relic, destruction of showcase or museum building and so on; museum, showcase and relic are all important factors for aseismic strengthening of the relics. Besides, to effectively protect the relics, traditional strengthening methods have to be improved; development as well as application of new isolation devices is encouraged.
Research on System Reliability of Plane Steel Truss
Authors: Li Hui Jun , Wang Zheng Zhong
Published: August 2013

More and more attentions are paid on reliability and sensitivity of space structure in recently years. To investigate the mechanical characteristics of plane steel truss, OpenSees is utilized to evaluate component and system reliability plane steel truss. Accuracy and efficiency of several reliability approaches are comprehensively compared. Physical property, geometric size of members, and external loads and nodal coordinates are treated as random variable. DDM is utilized to compute sensitivity coefficients of random variables. Finally, bounds on the probability of failure of series systems are estimated according to the KHD bounds.
Study on Shape Coefficient of Three-Parameters Power Model
Authors: Liu Wei , Shu Gan Ping
Published: August 2013

The moment and rotation curve (M-θ curve) of beam-column connection was described by three-parameters power model, but the shape coefficient (n) in the model rarely was studied. Eight top and seat angle connections was selected to analysis with Ansys10.0, based on three-parameters power model which was fit for structural analysis . The results were testified valid by test data and got others curves. The suggested value of shape coefficient (n) was got by numerical analysis method of these curves. The research indicated that numerical curves is fitted with test curves and FEA curves perfectly, and the shape coefficient (n) value of those numerical curves have small difference. By contrast of the initial stiffness and ultimate bending moment and those fitting curves, the shape coefficient (n) of top and seat angle connections is suggested 1.9.
Design of a Steel Pipe Truss for a Hot Spring Spa
Authors: Hou Shu Li , Yang Xiao Dong , Wang Ming Dong
Published: August 2013

Based on a real project, this paper presents the design of a space steel pipe truss with a triangular cross section upside down, in which it covers the selection of structure type, arrangement of the structure, loads and load combination, structural analysis as well as the detailing of some major joints. Thus it can serve as a reference for the design of similar large-span trusses.
Flexural Behavior of Prestressed Concrete Composite Slab with Corrugated Steel Web
Authors: Hou He Tao , Lv Zhong Long , Liu Hai Ning , Sun Yan Fei
Published: August 2013

In order to avoid the failure of bond slip between the new and old concrete of the prestressed concrete composite slab (named PK slab), and the difficulty in the formwork of PK slab, this paper presents a new type of prestressed concrete composite slab with corrugated steel web (named PCCW slab). By using ABAQUS finite element analysis, it was found that the flexural behavior of PCCW slab was better than that of PK slab. Based on the analysis result, it could be seen that at the elastic stage, the flexural strength of PCCW slab increased with the raising of thickness of corrugated steel web, height of concrete flange, width of concrete flange and hole space of corrugated steel web. Among those effects of parameters, the thickness of corrugated steel web and the height of concrete flange were important.
Research and Building of Ontology Base for Structural Experiment
Authors: Zhang Xiao Hui , Zhao Lian Ju , He Hao Xiang , Di Rui Hua , Li Wei Ming
Published: August 2013

Ontology is an important mean for knowledge reuse, sharing and modeling. Building an ontology base for structural experiment (OBSE) is the basis of efficiently sharing of structural experiment data. With the help of domain experts, the knowledge of structural experiment was fully analyzed and summarized, and the corresponding ontology base has been designed following standardized method. In order to enrich the knowledge in OBSE, the conversion method from traditional spreadsheet data and relational data to the instances of ontology base was designed and implemented. The construction of OBSE provides a unified specification model in this domain, and reduces the heterogeneity of the concepts and terminology, making it possible for the information exchanging and sharing among staff in different positions or different operating platforms.
Research on the Nonlinear Stability of the Steel Spatial Arch Truss with 120m Span and 0.2 Rise-Span Ratio
Authors: Liu Jing , Li Hai Wang , Sun Yue Nan , Shu Xue Feng
Published: August 2013

The elasto-plastic stability analysis on the steel spatial arch truss with 120m span and 0.2 rise-span ratio is carried out with the finite element program ANSYS. In the analyses, two conditions which are the geometric and material nonlinear, double nonlinear under different initial geometric defects are considered. The results show that the instability modes of arch trusses are all asymmetric instability of plane, and that the buckling load and plastic development of the four arch trusses with L/500, L/400, L/300 and L/200 initial geometric defects are decreased with the increase of different initial geometric defects, and that the axial stress of all web members is about the same, but the value of which does not exceed 235Mpa.
Study on Mechanical Property of Reinforced Concrete (RC) Beams under Sea Water
Authors: Yan Xi Kang , Chen Xiang Shang , Chen Pei
Published: August 2013

By way of the soaking and drying cycle test on the different mix proportions vertical section of 10 pieces of RC beams suffered artificial sea water (ASW) corrosion under0,35,70,105,140 times of dry-wet cycles, the compared result of exerting pressure test of these beams under simply supporting were investigated. The law was as follows: The resistibility to ASW corrosion for the concrete specimens with various water cement ratio (various initial strength) are different;The characters of normal section failure for RC beams attacked by sea water are about the same as that for ordinary RC beam; Along with the extension of the time for seawater attack, the bearing capacity for normal section of RC beams varies wave upon wave. The specimens attacked by seawater for about 35 times of corrosion cycle achieve minimum bearing capacity.
Study on Ductility Performance of T-Shaped Section Steel Reinforced Concrete Columns
Authors: Wang Xin
Published: August 2013

This paper, the mechanics characteristic of T-shaped section steel reinforced concrete column under low period repeated loading by using large-scale finite element analysis software ABAQUS was analyzed, combined existing research, the influence of the performance of ductility under different steel ratio and axial compression ratio was studied, we concluded that the T-shaped section steel reinforced concrete column has the very good ductility performance, and put forward the axial compressive ratio limit under the different parameters, and to provide the reference for future research and application.
Stimulation Analysis of High Temperature Bearing Capacity of Steel Reinforced Concrete Column Strengthened by CFRP
Authors: Qiu Cheng Zhu , Yang Gang
Published: August 2013

The steel reinforced concrete column is one of the important members for structures, it is essential to study the high temperature performance of concrete column. The numerical simulation research is done using finite element software ANSYS. Under the high temperature, the analysis of the compressive bearing capacity and flexural capacity of the concrete columns strengthened by CFRP is done, and the compressive bearing capacities of different cross-section concrete columns strengthened with CFRP are tested.
The Static Wind Load Research of a Flat Box Girder Based on the Numerical Wind Tunnel
Authors: Li Nan , Yang Ji Xin
Published: August 2013

In this paper, the wind field around the flat box girder of a long-span bridge under 0o attack angle was investigated by the numerical wind tunnel technique, which can not only get the distributions of the pressure, velocity and vortex in the flow field, but also obtain the various aerodynamic parameters of the bridges. The velocity profiles were obtained, and the coefficient of tri-component from the numerical simulations was in good agreement with that from the wind tunnel test, which demonstrated that it was reliable and feasible to utilize the numerical wind tunnel technique to simulate the wind field and certificate the coefficient of tri- component of the bridge.
Dynamic Stability Analysis of Steel-Concrete Composite Ribbed Shell under Vertical Step Loads
Authors: Hu Wei Bing , Meng Shuang Le , Chang Yu Zhen
Published: August 2013

The steel-concrete composite ribbed shell is a kind of novel space structure. In this paper, using space beam element and shell element, based on the nonlinear FE theory, considering the elastic-plastic material and geometric nonlinear, in view of the system dynamic response of identifying method, dynamic stability of steel-concrete composite ribbed shell under vertical step loads are studied. Setting up the relationship, it is between load amplitude and dynamic response of the structures, comparing rigid joint with hinge joint on the edge of structure, Critical load conditions of dynamic stability are defined.
Buckling Analysis of Short Cylinders of Uniform Thickness under Uniform External Pressure
Authors: Chen Lei
Published: August 2013

The failure of elastic perfect cylinders under uniform external pressure is caused by circumferential buckling. The effects of the cylinder length, of the restraining conditions at boundaries and of the length of the pressurized zone all have great influences on the critical buckling load. In the European Standard for Shells EN 1993-1-6 (2007), the critical circumferential buckling stress is obtained by introducing an external buckling factor which takes the influence of different boundary conditions into account. However, the restraint of the meridional rotation at boundaries was not considered separately for the factor. For short cylinders, any restraint of the boundaries affects the buckling mode and buckling strength greatly. In this paper, the effect of meridional end rotations on the buckling strength of short cylinders was studied. The pre-buckling membrane stress state given by membrane theory was assumed for all the analyses.
The Application of Endochronic Damage Constitutive Model in Cracking Analysis of Mass Concrete
Authors: Wang Huai Liang , Ren Yu Qing
Published: August 2013

This paper provides a brief introduction of endochronic damage constitutive model and studies the application of endochronic damage constitutive model in cracking analysis of mass concrete. This paper proved the model is feasible in cracking analysis of mass concrete and it is worth deep study.
The Experimental Study on Mechanical Performance of Multi-Span Column-Supported Assembly Box Concrete Hollow Floor
Authors: Zhao Kao Zhong , Wang Guang Yi
Published: August 2013

Assembly box concrete hollow floor sructure is a new-style whole structure that are constituted by the a cross section of a concrete box composed of small prefabricated components (concrete superposition box) and a cast-in-place concrete rib beam.The internal force distribution law was analyzed in this paper, based on the static load experiment with a multi span column-supported assembly box concrete hollow floor.The findings prove that the prefabricated boxs and cast-in-situ concrete ribbed beams are able to form a whole to jointly bear external forces, that the internal force distribution law is basically the same with the solid cast-in-situ concrete floor with no beams, and that the floor structure can be simplified to the column strip and middle strip.The specific distribution ratios between the minus moment and the plus moment of the column strip and middle strip respectively are as follows. For the angel area floor(contianed edge beams), the ratio of midspan section is 0.537:0.463, the ratio of support section is 0.816:0.184; for the edge area floor(contianed edge beams), the ratio of midspan section is 0.51:0.49, the ratio of support section is 0.808：0.192; for the inner area floor, the ratio of midspan section is 0.55:0.45, the ratio of support section is 0.75:0.25.
Numerical Study on Precast RC Wall Panels with Angle Steel Boundary Components
Authors: Xu Xiu Feng , Wang Tao
Published: August 2013

To evaluate the seismic behavior of precast reinforced concrete (RC) shear wall with steel boundary components, two pieces of prefabricated RC wall panels are tested quasi-statically under different axial compression forces. Both panels performed larger ductility than requested by the current seismic design code. Finite element model is then constructed to investigate the function of steel boundary components. The model is first calibrated by the experimental results. The strength, stiffness, and crack development all agree well with the phenomenon observed from experiments. Then the area of steel angle is changed as the main parameter to affect the seismic performance of RC wall panels. It is observed that the strength and ductility of a panel with steel boundary components are larger than that with common rebar boundary elements.
Predictive Method for Economic Indicators of High-Rise Frame-Tube Structures
Authors: Zhu Jie Jiang , Zhang Lei , Peng Yi Yun
Published: August 2013

With the rapid development of high-rise frame-tube office buidings in domestic large and medium-sized cities, it brings the problem about the study of quantities. Traditional structural design can meet the requirements of all kinds of standards, but it wastes materials, which is now taken seriously. Structural optimization design can save materials. This paper carries structural optimization design on eight high-rise frame-tube structures, and proposes a predictive method for concrete and steel-bar dosage of high-rise frame-tube structures after analysis. The predictive method makes it possible to predict the dosage before the structural design without the tedious budget process. The predictive value is economical and reasonable, and it can provide reference for structural design and construction in the future.
Failure Mode Attribution Analysis of PBL Shear Connector
Authors: Zhang Wen Jiang , Du Er Xia , Liu Bei Zhan , Yang Shao Chong
Published: August 2013

Investigation on PBL shear connectors failure modes and their related factors is conducted. On the basis of analysis on the detail mechanism of PBL shear connectors failure modes, the relations between the construction factors and failure modes are summarized. A reasonable way of failure mode is proposed for exerting the material properties of all components in PBL shear connector. As reference to construction and design of PBL shear connector, it is advised that the high strength concrete should be used, and the strength of steel plate should be not less than that of rebar. The position and posture of rebar cannot be ignored.
Axial Capacity of Steel Angles with Local Deformation
Authors: Xie Jian , Han Xiao Dan , Ge An Xiang
Published: August 2013

Axial compressive and tensile tests on twenty single equal-leg steel angles with different local deformations were presented. The results show the influence of local deformation on the axial capacity of steel angles. The angles with local deformations under axial compression fail mostly due to flexural-torsional buckling whereas angles without local deformation fail mostly because of local flexural buckling. The axial compressive capacity of angles is significantly reduced in the presence of local inner concave or outer convex deformations. Based on the test results, a finite element analysis was further conducted using ABAQUS 6.12. Analytical results given by finite element analysis are close to the test results. The former is usually a little higher with a deviation rate around ±10%. Finally, two empirical equations are proposed to evaluate the residual ultimate capacity of steel angles with local deformations. The predictions of the equation agree well with the test results.
Analysis of Residual Displacement of Combined Base Isolated Structure
Authors: Gu Ming , Zhang Fu You , Xu Song
Published: August 2013

Residual displacement is disadvantageous to combined base isolation system, as it may cause the structure to overturn when it is big enough. To elucidate the mechanism of the system residual displacement after earthquake, the motion equation of the system was established. Through the theoretical analysis, the calculating formula was given, and residual displacement was found relevant with horizontal stiffness, the max friction forces of the sliding bearings and the input ground motion. With this method, the results of an example show that the friction coefficient of sliding bearings is the key influence factor of the residual displacement, and the way of how to figure out the value of the friction coefficient is recommended in this article.
Effect of Cushion Layers on Mechanical Characteristics of Spiral Case Structure in Hydropower Station
Authors: Liu Bo , Liu Jian Hua , Wang Zhe
Published: August 2013

The effects of deformation modulus, thickness and range of cushion layer on mechanical characteristics of spiral case in hydropower station has been analyzed using the finite element program ANSYS and nonlinear contact theory. The result shows that when cushion layer scope and poisson ratio is fixed, as the elastic modulus of cushion layer decreases, the deformation and stress of spiral case increases, surrounding concrete load-bearing ratio of water pressure reduces. If the cushion layer deformation modulus is fixed and the range of cushion layer extends to 10 degree site bellow the waist of spiral case, the steel spiral case stress decrease, the radial stress transferred from the spiral case to surrounding concrete increase by about from 0.01MPa to 0.03MPa, and load-bearing ratio of concrete increase, when the cushion layer Poisson ratio increases from 0.25 to 0.35.
Preliminary Research on Mechanical Behavior of Steel Frame Filled with Steel Plate Shear Wall after Exposure to Overall Stage of Fire
Authors: Liao Xue Kun , Wei Fang Fang , Qu Li Hua
Published: August 2013

For a further study on the fire-resistant performance of steel plate shear wall under overall stage of fire, a numerical analysis model of steel frame filled with steel plate shear wall was built with the finite element software ANSYS. The stress and displacement distribution at different moments were calculated through the thermal structural coupling analysis acording to ISO-834 standard fire curve, by reasonable selection of the thermal parameters, which showed the highest temperature appeared on the heated side of the beam in the process of heating up, while the highest temperature in the stages of cooling and natural cooling appeared in the column-beam connection; The temperature of structure was elevated for 11minutes, then dropped for 64.5minutes and finally the structure was cooled in the air for 60.5minutes. The whole process shows that the lateral load-bearing capacity of the steel frame filled with steel plate shear wall was reduced by about 30 percent, compared to room temperature.
Key Technology Analysis of Construction of Joint-Pipe Method for Ultra-Deep Diaphragm Wall
Authors: Zhao Cun Hou , Cui Wei , Ma Bin
Published: August 2013

Based on a ultra-deep diaphragm wall of Pangduo hydropower station, time of pipe drawn and drawn force under different times and hole deviation was researched. Field test was used to verify analysis conclusion. The results show that drawn time is 7~8 hours after concrete pouring, that is 40m high concrete after pouring. Several factors has effect on drawn force which relates to contact characters between sliding pipe and concrete and hole deviation.