I am not geotechnical engineer. I have a question about any availability of a computerized , fast and efficient method ,machine for possible sinkhole survey of large areas.
I know we have some books in the forum, and also I can search the internet for this , but I was just wondering if anybody have any expert knowledge about this.
I keep seeing this horrific news about , cars falling in sinkholes, half of a house and people in it disappearing, etc
Self-consolidating concrete (SCC) is an innovative material used successfully throughout the world. It is a highly flowable, non-segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation, improving the overall efficiency of a concrete construction project. SCC mixtures are highly fluid, yet their flowing properties can be adapted for a range of applications and allow practitioners to select and determine levels of filling ability, passing ability, and stability.
Self-Consolidating Concrete: Applying What We Know discusses all aspects of SCC, including:
- Benefits and limitations
- Raw material components
- Mixture proportions
- Production and quality control
- Placement and curing
Presenting a basis for consistently producing and applying SCC in a regular production environment, this book is written from the perspective of the concrete practitioner. It uses descriptions and case studies throughout, as examples of specific types of applications, to identify where the practitioner needs to focus attention.
This book bridges the gap between research and practice. It links science with practical application, describing a number of projects and types of applications where SCC has been used successfully. It will be useful for new practitioners as well as for those already using SCC.
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Article/eBook Full Name: AISC Design Guide 26: Design of Blast Resistant Structures
Author(s): AISC
Edition: 2013
Publish Date: 2013
ISBN: N/A
Published By: AISC
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Article/eBook Full Name: Encyclopedia of Earthquake Engineering
Author(s): Beer, M.; Kougioumtzoglou, I.A.; Patelli, E.; Au, I.S.-K. (Eds.)
ISBN: 978-3-642-35344-4
Published By: Springer
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I sincerely expressed my deep condolence to the victims of the Central Aceh earthquake (2/7/2013) in the central of northern Sumatra region, Indonesia.
Part I Understanding welding residual stress and
distortion
1 Introduction to welding residual stress and
distortion 3
P. Michaleris, Pennsylvania State University, USA
1.1 Types of welding distortion 3
1.2 Formation of welding distortion 4
1.3 Distortion control methods 10
1.4 Book outline 20
1.5 References 20
2 Understanding welding stress and distortion using
computational welding mechanics 22
L.-E. Lindgren, Luleå University of Technology, Sweden
2.1 Introduction 22
2.2 The Satoh test 22
2.3 Thermomechanical analysis of welding problems 26
2.4 Eulerian and Lagrangian reference frames 29
2.5 Nonlinear heat conduction 31
2.6 Nonlinear deformation 36
2.7 Finite-element techniques in computational welding
mechanics (CWM) 41
2.8 Heat input models 46
2.9 Material models 58
2.10 References 66
3 Modelling the effects of phase transformations on
welding stress and distortion 78
J. A. Francis and P. J. Withers, University of Manchester,
UK
3.1 Introduction 78
3.2 Types of transformation 79
3.3 Transformation strains 84
3.4 Equilibrium phase diagrams 86
3.5 Continuous cooling transformation (CCT) diagrams 89
3.6 Signifi cance of transformation temperature 91
3.7 Metallurgical zones in welded joints 92
3.8 Effects of phase transformations on residual stresses in
welds 93
3.9 Transformation plasticity 95
3.10 Current status of weld modelling 95
3.11 References 97
4 Modelling welding stress and distortion in large
structures 99
L. Zhang, Link-Belt Construction Equipment, USA
4.1 Introduction 99
4.2 Three-dimensional applied plastic strain methods 100
4.3 Application on a large structure 112
4.4 Conclusions 122
4.5 References 122
5 Using computationally effi cient, reduced-solution
methods to understand welding distortion 124
T. G. F. Gray, University of Strathclyde, UK and
D. Camilleri, University of Malta, Malta
5.1 Introduction 124
5.2 Context and rationale for reduced-solution methods 125
5.3 Computationally effi cient solutions based on mismatched
thermal strain (MTS) and transverse contraction strain
(TCS) algorithms 130
5.4 Verifi cation of MTS and TCS algorithms 135
5.5 Multiple welds 140
5.6 Fillet welds 144
5.7 Hybrid and stepwise strategies 147
5.8 Selected case studies 151
5.9 Future trends 160
5.10 Sources of further information and advice 163
5.11 References 164
Part II Minimizing welding distortion
6 Minimization of bowing distortion in welded
stiffeners using differential heating 169
M. V. Deo, Cummins Inc., USA
6.1 Introduction 169
6.2 Welding-induced residual stress and bowing distortion 170
6.3 Mitigation of welding-induced bowing distortion 172
6.4 Experimental verifi cation of transient differential heating 174
6.5 Results 178
6.6 Conclusions 183
6.7 References 184
7 Minimizing buckling distortion in welding by thermal
tensioning methods 186
W. Li, The University of Texas at Austin, USA and J. Xu,
Strategic Global Sourcing, USA
7.1 Introduction 186
7.2 A simplifi ed fi nite-element model 187
7.3 The dynamic thermal tensioning method 195
7.4 Mitigating buckling distortion using the dynamic thermal
tensioning method 205
7.5 Conclusions 210
7.6 References 211
8 Minimizing buckling distortion in welding by weld
cooling 214
J. Li, Beijing Aeronautical Manufacturing Technology
Research Institute, China and Q.-Y. Shi, Tsinghua
University, China
8.1 Introduction 214
8.2 Welding with intensive trailing cooling, the dynamically
controlled low-stress no-distortion (DC-LSND) method 215
8.3 Mechanism of the DC-LSND method 226
8.4 Limitations and industry application 237
8.5 Conclusions 239
8.6 References 240
9 Minimizing buckling distortion in welding by hybrid
laser-arc welding 241
S. M. Kelly, R. P. Martukanitz and E. W. Reutzel,
Pennsylvania State University, USA
9.1 Introduction 241
9.2 Laser beam welding 242
9.3 Hybrid laser-arc welding (HLAW) 246
9.4 Hybrid laser-arc welding for reducing distortion in marine
construction 247
9.5 Conclusions 268
9.6 References 270
10 Minimizing angular distortion in welding by
reverse-side heating 273
M. Mochizuki, Osaka University, Japan
10.1 Introduction 273
10.2 Experimental 274
10.3 Mechanism of reduction in welding distortion 277
10.4 Conclusions 285
10.5 Acknowledgments 285
10.6 References 286
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Cement-based concrete has excellent properties as a construction material, and the raw materials of cement—rocks, and limestone and clay—are bountiful. Yet its production generates high quantities of CO2, making it a potentially unsustainable material. However, there are no alternatives to concrete and steel as basic methods for development of socioeconomic infrastructure at this time. Highlighting sustainability issues in the construction industry, The Sustainable Use of Concrete presents guidelines on how to move toward sustainable concrete construction.
The book begins by clarifying the historic background and meaning of sustainability, after which it outlines areas that need to be considered in connection with sustainability in the concrete and construction field. It examines environmental, social and cultural, and economic aspects, then considers an evaluation system of sustainability. The authors include various tools and ISO standards, and then explore technologies for sustainability, with case studies and examples that promote understanding of current technologies.
Although the construction sector, in the broadest sense, has come to recognize that infrastructure development over the past two centuries has been unsustainable, it has been slow to adjust. Comprehensive information and relevant practical guidance are very scarce. This book lays out a roadmap for creating a human-friendly and safe environment with low environmental burden.
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A general solution to vibrations of beams on variable Winkler elastic foundation is presented. The exact solution of the dynamic response of the beam is obtained by considering the reaction force of the foundation on the beam as the external force acting on the beam, which is an integral equation including the displacement of the beam. The four unknown constants in the solution are decided by the boundary conditions of the beam. The integrals in the solution are approximately and numerically calculated by means of the trapezoidal rule. By letting the right-hand side of the solution equal its left-hand side only at those discrete nodes of the quadrature, the frequency equation is obtained which is described by a determinant whose order is equal to the number of the discrete nodes. The mode shape functions are represented by a series of unified analytical functions. The analysis and programing are very simple. It is possible to find the natural frequencies and mode shapes of vibrations by using a small number of the discrete nodes in the trapezoidal quadrature and it is concluded that the use of the method yields better convergence at lower computation costs. Finally, several examples are given for simply supported beams on variable Winkler elastic foundation.
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