Author: Kim H Tan | Size: 36 MB | Format:PDF | Quality:Unspecified | Publisher: CRC Press | Year: 1998 | pages: 390 | ISBN: 082470147X
Learn the secrets of soil chemistry and its role in agriculture and the environment. Examine the fundamental laws of soil chemistry, how they affect dissolution, cation and anion exchange, and other reactions. Explore how water can form water-bridges and hydrogen bonding, the most common forces in adsorption, chelation, and more. Discover how electrical charges develop in soils creating electrochemical potentials forcing ions to move into the plant body through barriers such as root membranes, nourishing crops and plants. You can do all this and more with Principles of Soil Chemistry, Third Edition.
Since the first edition published in 1982, this resource has made a name for itself as a textbook for upper level undergraduates and as a handy reference for professionals and scientists. This fourth edition reexamines the entire reach of soil chemistry while maintaining the clear, concise style that made previous editions so user-friendly. By completely revising, updating, and incorporating a decade’s worth of new information,
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Revit® building design software* is specifically built for Building Information Modeling (BIM), empowering design and construction professionals to bring ideas from concept to construction with a coordinated and consistent model-based approach. Revit is a single application that includes features for architectural design, MEP and structural engineering, and construction.
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Dynamic Finite-Element Analysis of Jointed Concrete Pavements
Author: Karim Chatti John Lysmer Carl Lo Monismith | Size: 954 KB | Format:PDF | Quality:Unspecified | Publisher: The University of California Transportation Center University of California Berkeley, CA 94720 | Year: 1994 | pages: 15
A new dynamic finite-element computer program, DYNA-SLAB, for
the analysis of jointed concrete pavements subjected to moving transient
loads is presented. The dynamic solution is formulated in both
the time and the frequency domains. The structural model for the slab
system is the one used in the static computer program ILLI-SLAB.
’I1le foundation support is represented by either a damped Winkler
model with uniformly distributed frequency-dependent springs and
dashpots or a system of semi-infinite horizontal layers resting on a
15~gid base or a semi-infinite half-space. An important contribution
from the study is a new analytical method for determining the stiffness
and damping coefficients to be used in the Winlder foundation model.
’I]~e accuracy of DYNA-SLAB has been verified by comparing the
results produc~.~d by the program with those from theoretical closedfiarm
solutions and from a powerful dynamic soil-structure interaction
computer program called SASSI as well as with field data. The analytical
results indicate that dynamic analysis is generally not needed
f0r the design of rigid pavements and that it usually leads to decreased
p-’~vement response. Thus, it appears that a quasistatic analysis is sufficient
and that the results from this type of analysis will generally be
conservative, provided that the wheel loads used in the analysis have
been adjusted for the effects of vehicle velocity, truck suspension
characteristics., and pavement roughness
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EFFICIENT FINITE ELEMENT MODELING OF REINFORCED CONCRETE COLUMNS CONFINED WITH FIBER REINFORCED POLYMERS
Author: by Dan Hu Southwest Jiaotong University, China, | Size: 2.1 MB | Format:PDF | Quality:Unspecified | Year: 2012 | pages: 126
Fiber reinforced polymer (FRP) composites have found extensive applications in the field of Civil Engineering due to their advantageous properties such as high strength-to-weight ratio and high corrosion resistance. This study presents a simple and efficient frame finite element (FE) able to accurately estimate the load-carrying capacity and ductility of reinforced concrete (RC) circular columns confined with externally bonded fiber reinforced polymer (FRP) plates and/or sheets. The proposed FE considers distributed plasticity with fiber-discretization of the cross- sections in the context of a force-based (FB) formulation. The element is able to model collapse due to concrete crushing, reinforcement steel yielding, and FRP rupture.
The frame FE developed in this study is used to predict the load-carrying capacity of FRP- confined RC columns subjected to both concentric and eccentric axial loading. Numerical simulations and experimental results are compared based on experimental tests available in the literature and published by different authors. The numerically simulated responses agree well with the corresponding experiment results. The outstanding features of this FE include computational efficiency, accuracy and ease of use. Therefore, the proposed FE is suitable for efficient and accurate modeling and analysis of RC columns confined with externally retrofitted
FRP plates/sheets as for parametric studies requiring numerous FE analyses.
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FLEXURAL BEHAVIOR OF REINFORCED CONCRETE BEAMS USING FINITE ELEMENT ANALYSIS (ELASTIC ANALYSIS)
Author: R. SRINIVASAN and *K. SATHIYA | Size: 787 KB | Format:PDF | Quality:Unspecified | Publisher: BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVI (LX), Fasc. 4, 2010 Secţia CONSTRUCŢII. ĂRHITECTURĂ | pages: 11
Abstract. Concrete structural components exist in buildings in different forms.
Understanding the response of these components during loading is crucial to the
development of an overall efficient and safe structure. Different methods have been
utilized to study the response of structural components. Experimental based testing has been widely used as a means to analyse individual elements and the effects of concrete strength under loading. While this is a method that produces real life response, it is extremely time consuming, and the use of materials can be quite costly. The use of finite element analysis to study these components has also been used.
The performed study investigation attempts to compare the results from elastic analysis of a reinforced beam under transverse loading, using an analysis software package to that obtained from a normal theoretical analysis.
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FINITE ELEMENT ANALYSIS OF CONFINED CONCRETE COLUMNS
Author: Christina Claeson | Size: 334 KB | Format:PDF | Quality:Unspecified | Publisher: Research Assistant, M.Sc. Division of Concrete Structures Chalmers University of Technology S-412 96 Göteborg, Sweden | pages: 20
Finite element analyses of confined columns are presented.
Based on a confinement dependent uniaxial concrete model,
the importance of the yield strengths of the stirrups and the
longitudinal reinforcement bars, the spacing of the stirrups,
and the configuration of the cross-section, in combination
with different load eccentricities are evaluated. It was found
that the spacing of the stirrups and the reinforcement
configuration are of the greatest importance for the post-peak
behavior. To achieve ductile structural behavior of highstrength
concrete columns, a higher value of the volumetric
stirrup ratio is required. However, it was found that, even for
concretes currently accepted by the code, a higher ratio than
that corresponding to the required maximum spacing of 15f is
needed to obtain the same ductility as a concrete of grade
K40.
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Have you ever wondered how the ideas behind the world’s greatest architectural designs came about? What process does an architect go through to design buildings which become world-renowned for their excellence?
This book reveals the secrets behind these buildings. He asks you to ‘read’ the building and understand its starting point by analyzing its final form. Through the gradual revelations made by an understanding of the thinking behind the form, you learn a unique methodology which can be used every time you look at any building.
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The future of a profession resides with the young for they are the next generation of professionals. The best thing that the senior members of the profession can do is to provide the opportunities for the young to develop their talents. That was one of the motivations we had when we organised the first YGEC in UK in 1981. I am very pleased that what we started nearly 30 years ago has grown and flourished. With the strong support of ISSMGE the programme of conferences for Young Geotechnical Engineers is well established world-wide. All the ISSMGE regions now have regional conferences, many national societies have their own conferences and so far there have been four International Young Geotechnical Engineers Conferences. These have been organised largely by senior professionals but their continuing success has been due to the enthusiasm and contributions of the young.
Looking at the list of papers submitted to this 20th EYGEC there is a wide variety of topics reflecting the diversity of geotechnical engineering. Each paper will be formally presented by its author and this, both writing a technical paper and delivering it formally in public, is part of the development of a professional. But so too is the process of accumulating and evaluating information especially when it has been delivered as a presentation. One of my best mentors, Professor Peter Wroth, taught me always to take notes. His view was that because you cannot remember everything that is said and you cannot write as fast as the speaker can speak you have to concentrate on what is being said, filter the important bits and note those. (He would also privately award marks for each presentation - both for the technical quality and the presentation skills – but those he kept confidential.) I encourage the young always to take notes.
Another motivation for organising the first YGEC was to show young professionals that they are not alone and their peers have exactly the same problems to contend with. This is especially true for young professionals working in small research groups or in small companies. Although the formal sessions are an important part of any conference the other equally important times are the intervals and social events when participants discuss their issues informally in smaller groups, often with refreshments. This is when technical opinions are revised and lasting friendships made.
In addition to the participants there are two groups of senior professionals that contribute to the success of a YGEC: the Organising Committee and the guest keynote speakers. All willingly give their time, experience and organisational skills. Here is an opportunity to discuss technical issues, formally and informally, with top professionals and it is an opportunity not to be missed. But ultimately the success of the conference, like any enterprise, depends on the young. They should observe, learn and most of all enjoy the occasion.
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FIB 35: Retrofitting of concrete structures by externally bonded FRPs, with emphasis on seismic applications
Size: 21 MB | Format:PDF | Quality:Unspecified | Publisher: FIB - The International Federation for Structural Concrete (fédération internationale du béton) | Year: 2006 | Pages: 221 | ISBN: 9782883940758
fib Bulletin 35 is the first bulletin to publish documentation from an fib short course. These courses are held worldwide and cover advanced knowledge of structural concrete in general, or specific topics. They are organized by fib and given by internationally recognized experts in fib, often supplemented with local experts active in fib. They are based on the knowledge and expertise from fib's ten Commissions and nearly fifty Task Groups.
fib Bulletin 35 presents the course materials developed for the short course "Retrofitting of Concrete Structures through Externally Bonded FRP, with emphasis on Seismic Applications", given in Ankara and Istanbul in June 2005. The course drew on expertise both from outside Turkey and from the large pool of local experts on this subject.
In most countries of the world, the building stock is ageing and needs continuous maintenance or repair. Moreover, the majority of existing constructions are deficient in the light of current knowledge and design codes. The problem of structural deficiency of existing constructions is especially acute in seismic regions, as, even there, seismic design of structures is relatively recent. The direct and indirect costs of demolition and reconstruction of structurally deficient constructions are often prohibitive; furthermore they entail a substantial waste of natural resources and energy. Therefore, structural retrofitting is becoming increasingly widespread throughout the world.
Externally bonded Fibre Reinforced Polymers (FRPs) are rapidly becoming the technique of choice for structural retrofitting. They are cleaner and easier to apply than conventional retrofitting techniques, reduce disruption to the occupancy and operation of the facility, do not generate debris or waste, and reduce health and accident hazards at the construction site as well as noise and air pollution in the surroundings.
fib Bulletin 35 gives state-of-the-art coverage of retrofitting through FRPs and presents relevant provisions from three recent standardisation milestones: EN 1998-3:2005 "Eurocode 8: Design of structures for earthquake resistance - Part 3: Assessment and retrofitting of buildings", the 2005 Draft of the Turkish seismic design code, and the Italian regulatory document CNR-DT 200/04, "Instructions for Design, Execution and Control of Strengthening Interventions by Means of Fibre-Reinforced Composites" (2004).
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