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Abstract:
For rational and accurate analysis of concrete structures, it is often desirable to include the post-cracking resistance of concrete. Due to the difficulties of testing concrete in direct uniaxial tension, only limited and often conflicting data are available. In the present investigation a method was developed to obtain reliable load-deformation behavior in tension, including the post-peak softening response. To characterize the softening response, strains at various locations on the specimens, elongations for various gage lengths, and optical measurements of crack widths were made. Seven different mix proportions were used to obtain information on the influence of aggregate size, water-cement ratio, and volume content of aggregates. An analytical expression has been developed to describe the entire tensile response of concrete.
Jack-up Scheme of Bearing Replacement Influence on the Structural Performance of Small Box Girder Bridge
Author(s): LI Jing-bin,CHEN Huai,GE Su-juan
Published By:School of Civil Engineering,Zhengzhou University
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Abstract: The Zhenfengou Bridge is a supported-continuous prestressed concrete small box-girder bridge,which is bearing replacements after damaging,is taken as the object to study in this thesis.The finite element software MIDAS/Civil is applied to set up the bridge's FEM model and the bridge is calculated during the whole construction stages.Two kinds of jack-up construction programs are considered,one is the whole jack-up construction program and the other is the partial jack-up construction program.The shear forces of the pier top,the bending moments of the midspan and the bending moments of the pier top both in the two programs are compared.The calculation results show,the 8mm maximum jack-up route is rational.From the opinion of the bridge's superstructure load bearing reasonability,the whole jack-up construction program is better than the partial jack-up construction program.The calculation results can be a reference for the similar project.
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Published By:School of Civil Engineering & Architecture,Chongqing Jiaotong University
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Abstract: The simple support-continuous girder bridge is widely used in the highway construction.With the increase of operation period of bridge,the issues of bearing replacement must be faced.Aiming at the case of transforming the high piers bridge with simple support to T continuous girder bridge on the Shuima Highway in the mountainous area,and the new method of bearings replacement is put forward by model test.This method is called longitudinal single-point(followed by pier),lateral synchronous jacking-up.Taking the safety of girder body in the lifting process as the goal,the limits of lifting bearings for T girder bridge of 20,30 and 40 meter span are obtained respectively.The results show that the new method "longitudinal single-point(followed by pier),lateral synchronous jacking-up" is reasonable and feasible,and the structural safety is assured.It has provided a new method and a new way for bearing replacement of similar bridges.
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The private house continues to occupy a unique position both in the history of architecture and human cultural imagination. The house, the domus, the home is at once refuge and shelter. It is the place of communion for the family (and its many contemporary variations), for domestic activities, for living, working, eating and sleeping, and is both a very public and private domain. The distracting delights of cities and social interaction are manifest, but everyone dreams of having a home. Throughout the Western world, the private house's popularity has remained undiminished during the 20th century. But even so, the current ubiquity of the house in its traditional
form—a series of common rooms and separate bedrooms, expressing a domestic culture evolved over centuries—is rife with contradictions. As the American architectural critic Terence Riley has observed, the social conditions and structures that underpinned the development of the private house—privacy, the separation of living and work, the family and the nature of domesticity itself—have all changed drastically. Perhaps more so in the last 50 years than in the preceding four centuries, when the private house began to develop as a popular type. A new and notable generation of house designs— commissioned by forward-thinking clients—is addressing not only critical architectural issues but also the cultural parameters of the private dwelling.
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Presents new and inspiring apartment interiors in a diverse range of styles designed by leading international architects.
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Recent advancement in soil behavior, in situ test methods, pile foundations, and tunneling:
selected papers from the 2009 GeoHunan International Conference,
August 3-6, 2009, Changsha, Hunan, China
An international conference titled, “Challenges and Recent Advances in Pavement Technologies and Transportation Geotechnics” was held in China during 3 – 6 August 2009. The conference was hosted by Changsha University of Science and Technology, China and co-sponsored by ASCE Geo-Institute, Asphalt Institute, Central South University, Chinese Society of Pavement Engineering, Deep Foundation Institute, Federal Highway Administration, US Department of Transportation, Hunan University, China, International Society for Asphalt Pavements, Jiangsu Transportation Research Institute (JSTRI), China, Korea Institute of Construction Technology, Korean Society of Road Engineers, Shanghai Highway & Transportation Society, Texas DOT, Texas Transportation Institute, and Transportation Research Board (TRB).
This geotechnical special publication constitutes the proceedings of the four sessions of the conference: Soil Behavior and Laboratory Testing, In-situ Test Methods for Site Characterization, Design and Quality Control of Earth Structures and Subgrades, Pile Foundations in Subgrade, and Tunnel Engineering.
Whilst soil has been used as construction material since ancient times, technological advances continue to be made in the means of exploring, testing and in the geotechnical methods for planning and designing. The knowledge and awareness of soil behavior is fundamental to all aspects of geotechnical engineering. The objective of this publication is to provide the reader with information and foster the data on recent advances in the in-situ and laboratory testing, pile foundation systems, tunneling and design procedures for earth structures. The collection of peer-reviewed papers accumulated here synthesizes the current and future progression in respective geotechnical fields.
Papers in this volume were reviewed by professional geotechnical engineers with expertise in the subject area. Each paper included in this publication has received at least two positive examine reviews. Authors were given the opportunity to modify their papers based on reviewer’s suggestions prior to final submittal of the papers.
The ideas in the papers are those of authors and do not necessarily represent the views of reviewers, editors and ASCE. All papers are eligible for discussion in the Journal of Geotechnical and Geo-environmental Engineering and are eligible for ASCE awards.
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Title: Management Systems for Construction
Authors: Alan Griffith, Paul Stephenson, Paul Watson
Paperback: 368 pages
Publisher: Routledge; 01 edition (31 Mar. 2000)
Language: English
ISBN-10: 0582319277
ISBN-13: 978-0582319271
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The Elastic Beam Calculations Handbook presents a mathematically rigorous treatment of beams based on elastic theory written at a technical level that is as simple as can be achieved without losing clarity. Practitioners will quickly learn the essentials to apply elastic beam calculations in their work. This much-needed comprehensive reference covers elastic beams with varying material and section properties, support conditions, span lengths, and other important geometric features. It provides simple and logical presentations of elastic beam problems by addressing each as corollaries of a more general theorem, consequently resulting in numerical work that can be planned and executed with ease, clarity, and optimal results. Structural engineers concerned directly with structural analysis of elastic beam problems will find many examples of useful and neat solutions and the rationale for their validity.
KEY FEATURES
--Offers a clear and systematic presentation of hundreds of problems and topics with detailed explanations of the methods and rationale used to obtain solutions
-- Promotes critical thinking through rigorous mathematical deduction by delineation of the interconnectedness among various topics
-- Demonstrates the physical significance of formulae, reveals pertinent parameters, and delineates their effects on the solutions
-- Provides the analytical competence of critical thinking in the formulation of elastic beam problems and closed form solutions
-- Illustrates the usual assumptions, principles, methods and procedures within the framework of linear elastic behavior of materials that are either explicitly cited or implicitly utilized
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