检索结果-内蒙古大学图书馆

Concrete International 2014年第11期36卷 39-42页

作者： Grace, Nabil Bebawy, Mena Ushijima, Kenichi SouthfieldMI United States Civil Engineering Department Architectural Engineering Program at LTU United States Cable Technologies North America Inc. NoviMI United States At Tokyo Rope Mfg. Co. Ltd. Tokyo Japan

来源：评论

学校读者我要写书评

暂无评论

Parametric study using modal analysis of a bi-material plate with defects

引用

AIP Conference Proceedings 2015年第1期1650卷

作者： S. Esola I. Bartoli S. E. Horner J. Q. Zheng A. Kontsos Theoretical & Applied Mechanics Group Department of Mechanical Engineering & Mechanics Drexel University 3141 Chestnut St. Philadelphia PA 19104 USA Department of Civil Architectural and Environmental Engineering Drexel University 3141 Chestnut St. Philadelphia PA 19104 USA Program Executive Office - Soldier U.S. Army Fort Belvoir VA 22060 USA Theoretical & Applied Mechanics Group Department of Mechanical Engineering & Mechanics Drexel University 3141 Chestnut St. Philadelphia PA 19104 USA

Global vibrational method feasibility as a non-destructive inspection tool for multi-layered composites is evaluated using a simulated parametric study approach. A finite element model of a composite consisting of two, isotropic layers of dissimilar materials and a third, thin isotropic layer of adhesive is constructed as the representative test subject. Next, artificial damage is inserted according to systematic variations of the defect morphology parameters. A free-vibrational modal analysis simulation is executed for pristine and damaged plate conditions. Finally, resultant mode shapes and natural frequencies are extracted, compared and analyzed for trends. Though other defect types may be explored, the focus of this research is on interfacial delamination and its effects on the global, free-vibrational behavior of a composite plate. This study is part of a multi-year research effort conducted for the U.S. Army program Executive Office - Soldier.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A case study implementation of the bim planning procedures for facility owners

A case study implementation of the bim planning procedures f...

引用

2013 architectural engineering National Conference: Building Solutions for architectural engineering, AEI 2013

作者： Chunduri, Sreelatha Kreider, Ralph Messner, John I. Research Program Department of Architectural Engineering Pennsylvania State University 104 Engr Unit A University Park PA 16802 United States

ISBN: (纸本)9780784412909

Many facility owners are beginning to adopt Building Information Modeling (BIM) to effectively operate and maintain the facility. The BIM Planning Guide for Facility Owners helps in planning and integrating BIM throughout the organization and the life cycle of the facility. To assist owners with planning for the adoption of BIM, three procedures were developed. These procedures include BIM organizational strategic planning, BIM organizational execution planning, and BIM project procurement planning. These procedures were developed through content analysis of available industry and research documents;industry interviews;workshops;and observational case studies. As part of the validation for the procedures developed, case studies were conducted in which the procedures were implemented. To understand the effectiveness of the procedures outlined in the BIM Planning Guide for Facility Owners, a case study of a well-established real estate development firm was conducted. The case study was conducted by implementing the strategic planning and procurement planning procedures that are applicable to the organization's needs. Within the strategic planning procedure, the organization assessed their needs, targeted goals, objectives, and uses, and developed a plan for implementation. The procurement planning effort focused on developing the contract language necessary to accomplish the goals and objectives. The lessons learned from the case study will help in future planning and implementation along with the overall improvement of the procedure. © 2013 American Society of Civil Engineers.

关键词： Strategic planning

来源：评论

学校读者我要写书评

暂无评论

Corrosion evaluation of post-tensioning systems after long-term exposure testing

Corrosion evaluation of post-tensioning systems after long-t...

引用

23rd International Offshore and Polar engineering Conference, ISOPE 2013

作者： McCool, G.E. Wheat, H.G. Breen, J.E. Wood, S.L. Civil Architectural and Environmental Engineering Department United States Degenkolb Engineers Los Angeles CA United States Mechanical Engineering Department Materials Science and Engineering Program University of Texas at Austin Austin TX United States

ISBN: (纸本)9781880653999

Post-tensioned concrete structures have been gaining in popularity over the past few decades. When properly designed, such structures allow for longer span lengths, reduced cracking, and less reinforcement than reinforced concrete structures. Their use of higher strength steel and the exposure to higher stresses, however, can result in increased vulnerability to corrosion damage. Moreover, recent high-profile failures of these types of structures have been linked to materials issues and construction procedures. As a result of the heightened interest in post-tensioned concrete structures, two research projects (Test program 1 and Test program 2) were carried out on a number of post-tensioning systems involving several different prestressing strand types. The objective of the second project (Test program 2) was to evaluate the corrosion performance of a number of post-tensioning materials and systems in an effort to increase the durability of post-tensioned concrete structures. The results of forensic analysis after long-term exposure in the second research project will be described in this paper. Copyright © 2013 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Concrete construction

来源：评论

学校读者我要写书评

暂无评论

Bayesian inference approach to room-acoustic modal analysis

引用

AIP Conference Proceedings 2013年第1期1553卷 38-45页

作者： Wesley Henderson Paul Goggans Ning Xiang Jonathan Botts Graduate Program in Architectural Acoustics Rensselaer Polytechnic Institute USA Department of Electrical Engineering University of Mississippi USA

Spectrum estimation is a problem common to many fields of physics, science, and engineering, and it has thus received a great deal of attention from the Bayesian data analysis community. In room acoustics, the modal or frequency response of a room is important for diagnosing and remedying acoustical defects. The physics of a sound field in a room dictates a model comprised of exponentially decaying sinusoids. Continuing in the tradition of the seminal work of Bretthorst and Jaynes, this work contributes an approach to analyzing the modal responses of rooms with a time-domain model. Room acoustic spectra are constructed of damped sinusoids, and the modelbased approach allows estimation of the number of sinusoids in the signal as well as their frequencies, amplitudes, damping constants, and phase delays. The frequency-amplitude spectrum may be most useful for characterizing a room, but in some settings the damping constants are of primary interest. This is the case for measuring the absorptive properties of materials, for example. A further challenge of the room acoustic spectrum problem is that modal density increases quadratically with frequency. At a point called the Schroeder frequency, adjacent modes overlap enough that the spectrum - particularly when estimated with the discrete Fourier transform - can be treated as a continuum. The time-domain, model-based approach can resolve overlapping modes and in some cases be used to estimate the Schroeder frequency. The proposed approach addresses the issue of filtering and preprocessing in order for the sampling to accurately identify all present room modes with their quadratically increasing density.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Towards advanced solutions for achieving sustainability goals in buildings: Lessons learned from case studies

Towards advanced solutions for achieving sustainability goal...

引用

2nd Annual International Conference Sustainable Design, engineering and Construction, ICSDEC 2012

作者： Halicioglu, Fahriye Hilal Arditi, David Gunhan, Suat Illinois Institute of Technology Department of Civil Architectural and Environmental Engineering Construction Engineering and Management Program 60616Post Doctoral Visiting Research Scholar Chicago IL 60616 United States University of Texas at San Antonio College of Architecture Construction Science and Management Program 501 W. Cesar Chavez Blvd. San Antonio TX 78207 United States

ISBN: (纸本)9780784412688

Sustainable building projects deal with a multitude of technical, environmental, economic, social, organizational, and innovation-related issues, to name but a few. Achieving sustainability goals depends on how well these issues are handled. While some sustainable building projects are quite successful, some are not. It is therefore important to learn lessons from past projects. This research aims to reveal the key lessons concerning sustainability-related issues in building projects. To that end, challenges in the achievement of sustainability goals of building projects are discussed, and lessons learned systems are examined. After that, the events experienced by project managers in a large number of sustainable building projects are obtained from a major public agency's website and are analyzed. The findings show the key lessons that have an important impact on the success/failure of sustainable building projects. The expected contribution of the study is to foster advanced solutions for future sustainable projects. © 2013 American Society of Civil Engineers.

关键词： Sustainable development

来源：评论

学校读者我要写书评

暂无评论

Developing standards to assess the quality of BIM criteria for facilities management

Developing standards to assess the quality of BIM criteria f...

引用

2013 architectural engineering National Conference: Building Solutions for architectural engineering, AEI 2013

作者： Kasprzak, Colleen Ramesh, Ashwin Dubler, Craig Pennsylvania State University 113 Office of Physical Plant University Park PA 16802 United States Research Program Department of Architectural Engineering Pennsylvania State University 104 Engr Unit A University Park PA 16802 United States

ISBN: (纸本)9780784412909

With increasing frequency in the use of BIM for facility handover, organizations have to address the quality of information. Previous studies have shown the substantial impact inadequate interoperability of information has on facility operations. Since 2009, the Pennsylvania State University (PSU) has implemented Building Information Modeling (BIM) on all new projects over $5 million and major facility renovations. The BIM criterion was developed by determining facility geometry and data level of detail required to perform typical operations tasks. The success of operations also depends on the completeness and accuracy of the information received. Therefore, PSU has developed a standard process to audit model information during the lifecycle of the facility project. This paper will discuss the procedure developed by PSU to plan the validity and reliability of the model geometry and information. This includes an overview of risk forecasting and analysis procedures created as a rule set for data review, as well as highlight quality grading scales used for model acceptance. Additionally, one case study will be reviewed, depicting the developed quality control standards for both a new construction project and a major renovation. The Pennsylvania State University has ten projects implementing BIM that will be delivered over the next two years and the quality of the information received is essential to the success of operations and maintenance of these facilities. © 2013 American Society of Civil Engineers.

关键词： Quality control

来源：评论

学校读者我要写书评

暂无评论

Habitat, housing social connectivity to promote social well-being

引用

International Journal of Design and Nature and Ecodynamics 2013年第4期8卷 356-371页

作者： Abell, J. Alhusban, A. Alhusban, S. Lurasi, S. School of Design and Construction Washington State University United States Hashemite University Department of Architectural Engineering Jordan Jordan Al-albayt University Department of Architectural Engineering Jordan Jordan Yale School of Architecture Doctor of Philosophy Program United States

Social connectivity concepts and modelling techniques have informed built environmental design practices for centuries, even if tacitly so. Villages, cities and buildings are habitats housing social networks that confi gure social encounters. Questions on how the city and the building infl uence social and psychological behaviour and vice versa have been the focus of much theoretical discussion in recent years. Increasingly, social network analysis and space syntax analysis are used to explain how the city plan and the building plan confi gure social encounters. These techniques are empirical and can be used predictively for design research and development purposes. However, few have attempted to integrate these modelling techniques. The special focus of this paper is on integrating network modelling techniques to benefi t built environmental design research practices concerned with habitat housing social connectivity to promote social well-being. The positive results of a test comparing space syntax calculation methods and social network analysis calculation methods are presented. A brief discussion of recent habitat regeneration initiatives in Tirana, Albania suggests the vast potential for further research integrating social network analysis concepts and modelling techniques to measure design performance. © 2013 WIT Press.

关键词： Housing

来源：评论

学校读者我要写书评

暂无评论

Application of sensing technology in the prevention of backing accidents in construction work zones

Application of sensing technology in the prevention of backi...

引用

2013 ASCE International Workshop on Computing in Civil engineering, IWCCE 2013

作者： Choe, Sooyoung Leite, Fernanda Seedah, Dan Caldas, Carlos Construction Engineering and Project Management Program Department of Civil Architectural and Environmental Engineering University of Texas at Austin 301 E Dean Keeton St. Austin TX 78712-1094 United States Center for Transportation Research University of Texas at Austin 1616 Guadalupe Street Austin TX 78701 United States

ISBN: (纸本)9780784477908

Machinery- and vehicle-related fatalities represented 32% of construction fatalities in 2010, and backover fatalities were recorded as one of the main culprits due to limited visibility. In order to minimize backover accidents, sensor-based proximity warning technologies - such as video camera, radar, ultrasonic, and tag-based systems - have been developed, tested and in use in many new passenger vehicles. This paper addresses potential implementation of sensor-based proximity warning systems to minimize backing accidents by reviewing sensing technologies applicable for construction equipment and presenting a formalized framework of sensor-based proximity warning systems evaluation. The presented framework includes a generic sensor system selection approach and performance testbed protocol. The proposed framework is expected to help decision makers objectively evaluate sensor-based proximity warning systems in their selection to implementation in the construction work zones. © 2013 American Society of Civil Engineers.

关键词： Construction equipment

来源：评论

学校读者我要写书评

暂无评论

A VoIP Enabled Cooperative Network for Agricultural Commerce in Amazon Peru

A VoIP Enabled Cooperative Network for Agricultural Commerce...

引用

IEEE Global Humanitarian Technology Conference

作者： David Espinoza Alan Mickelson Jared Leventhal Christie Ritter River Quispe Leopoldo Linan Interdisciplinary Telecommunications Program University of Colorado at Boulder Electrical Computer and Energy Engineering Department/Interdisciplinary Telecommunications Program University of Colorado at Boulder Civil Environmental and Architectural Engineering Department/Leeds School of Business University of Colorado at Boulder Civil Environmental and Architectural Engineering Department University of Colorado at Boulder Rural Telecommunications Research Group - Telecommunications Program Pontificia Universidad Catolica del Peru

ISBN: (纸本)9781479924035

This paper addresses the use of a VoIP communication service running on a Wi-Fi-based network in the Peruvian Rainforest to enable a cooperative network among producers, buyers and transporters of agricultural products. As a result, uncertainties in a geographically isolated imperfect agricultural market will be reduced, leading to a more efficient use of scarce resources, an increase of farmers' incomes, and more competitive prices of products in urban markets. This project involves enabling access to agricultural product information from buyers in urban areas to farmers in rural villages, as well as transporters and middlemen. The deployment of the Wi-Fi network began in 2007. This network, a 445 km long Wi-Fi Long Distance-based network, was deployed by the Rural Telecommunications Research Group and the Spanish-Americas Health Link (EHAS) Foundation to support telemedicine programs. The deployed network and excess bandwidth makes it possible to continue promoting development in this area by allowing coexistence with other services such as the proposed VoIP enabled cooperative network for commerce of agricultural products. To achieve this end, challenges include: 1) designing an appropriate framework to enable the cooperative network among participants, 2) designing appropriate friendly end-user technology for first-time technology users, and 3) designing an appropriate business model which ensures a sustainable growing service. Using the VoIP service as a tool to enable affordable communication for this agricultural initiative will allow interaction among producers, buyers and transporters located hundreds of kilometers apart and open unprecedented choices for them to offer and trade products, generating innovative practices tailored for the local conditions.

关键词： Rivers Business Telecommunications Agricultural products Cooperative systems Cities and towns Marine vehicles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：