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STEEL CONNECTION ANALYSIS by Paolo Rugarli


Figure 2.20. A framed structure with all the jnodes marked. In the circle, jnode AB. From Paolo Rugarli, Steel Connection Analysis, John Wiley & Sons, 2018. All rights reserved .

It is a wide and ambitious work, referring to the analysis of steel connections. The book is the result of some like 17 years of study, research and development. It describes the theoretical background of the software C.S.E..

CSE (Connection Study Environment) has been the first software in the world to automate the checks of generic connections, and to solve problems like the automatic detection of equal nodes, or the automatic fem modeling of nodes, opening an entire new field of applications, unexplored. In some years, other software houses have proposed software apparently similar. CSE is on the market since the year 2008, and the research has started in year 1999-2000.

Figure 4.1. A jnode and its renode completed. From Paolo Rugarli, Steel Connection Analysis, John Wiley & Sons, 2018. All rights reserved .

No program really innovative may be written without years and years of study, and CSE is no exception. It has been developed in many years of study, research and tryouts. The book explains the most part of the research done, and describes the analysis of steel connection thanks to a number of brand new methods. No existing book adopts this approach to steel connection analysis. Therefore it is absolute news in the publishing panorama of steel structures engineering.

The publisher, John Wiley & Sons, is one of the two or three most important worldwide for technical publishing, and will assure to the book the widest diffusion and visibility. This web page has been written in September 2017, the foreseen book availability is January, 2018. The book, which is expected to have 480 pages, will be hardcover and in colour. The format is 170x244 mm. Three versions will be available: in paper (ISBN 978-1-119-30346-6), in ePUB file format (ISBN 978-1-119-30353-4) and in PDF file format (ISBN 978-1-119-30348-0). Here the link to the page of the book at the publisher's website.

Figure 10.4. Pulled beam. The beam and the column are modeled with their flexibility [...]. A stress concentration at mid of beam flange is observed [...]. From Paolo Rugarli, Steel Connection Analysis, John Wiley & Sons, 2018. All rights reserved .

In addition to the extended discussion of problems and methods, the book has parts of pseudo-code to allow the independent implementation of some brand new functionalities. The book is divided in 11 chapters and 3 appendices, with 261 images. The chapters are:

  1. Introduction
    1. An unsolved problem
    2. The limits of traditional approaches
    3. Some limits of the codes of practice
    4. Scope of this work
    5. Automatic modeling and analysis of 3D connections
    6. Acknowledgements
  2. JNodes
    1. The BFEM
    2. From the BFEM to the member model
    3. The jnodes
    4. Jnode analytics
    5. Equal jnodes detection
    6. Structural connectivity indices
    7. Particular issues
    8. Jclasses
  3. A Model for Connection
    1. Terminology
    2. Graphs of connections
    3. Subconstituents vs layouts
    4. Classification of connections
  4. Renodes
    1. From jnode to renode concept
    2. BREP geometrical description of 3D objects
    3. The scene
    4. Dual geometry
    5. Automatic connection detection
    6. Elementary operations
    7. Renode logic and the chains
    8. Prenodes
    9. After scene creation
  5. The Pillars of Connection Analysis
    1. Equilibrium
    2. Action reaction principle
    3. Statics of connections
    4. The static theorem of limit analysis
    5. The unsaid of the engineering simplified methods
    6. Missing pillars of connection analysis
    7. Analysis of connections: general path
  6. Connectors: Weld Layouts
    1. Introduction
    2. Considerations about the stiffness matrix of connectors
    3. Introduction to weld layouts
    4. Reference systems and stresses for welds
    5. Geometrical limitations
    6. Penetration weld layouts
    7. Fillet-welds weld layouts
    8. Mixed penetration and fillet weld weld layouts
  7. Connectors: Bolt Layouts and Contact
    1. Introduction to bolt layouts
    2. Bolt sizes and classes
    3. Reference systems and stresses for bolt layouts
    4. Geometrical limitations
    5. Not preloaded bolt layouts (bearing bolt layouts)
    6. Preloaded bolt layouts (slip resistant bolt layouts)
    7. Anchors
    8. Stiffness matrix of bolt layouts and of single bolts
    9. Internal force distribution
    10. Contact
  8. Failure Modes
    1. Foreword
    2. The utilization factor concept
    3. About specifications
    4. Weld layouts
    5. Bolt layouts
    6. Pins
    7. Members and force-transferrers
  9. Analysis: Hybrid Approach
    1. Introduction
    2. Some basic recalls about fem analysis of plated-structures
    3. The IRFEM
    4. Connectors checks
    5. Cleats and members non-fem checks
    6. Single-Constituent Finite Element Models (SCOFEM)
    7. Multiple-Constituents Finite Element Models (MCOFEM)
    8. A path for hybrid approach
  10. Analysis: Pure Fem Approach
    1. Losing the sub-connectors organization
    2. Finite elements for welds
    3. Finite elements for bolts
    4. Loads
    5. Constraints
    6. Checking of welds and bolts
    7. Checking of constituents
    8. Stiffness evaluation
    9. Analysis strategies
  11. Conclusions and Future Developments
    1. Conclusions
    2. Final acknowledgements
    3. Future developments
Appendices:
  1. Conventions and Recalls
  2. Tangent Stiffness Matrix of Fillet-Welds
  3. Tangent Stiffness Matrix of Bolts in Shear

Figure 10.18. A Von Mises stress map of a complex PFEM. From Paolo Rugarli, Steel Connection Analysis, John Wiley & Sons, 2018. All rights reserved .

This book is a serious effort aimed at the systematization of steel connection analysis and check. It describes a number of general methods useful to check every type of connection or joint, with an arbitrarily high number of members, with any inclination and loads. It proposes a system to analyze connections that enables to deal with steel connections using methods similar to the ones already in use for normal structures. The steel connection analysis issue is seen in its generality, and faced in a global perspective. It is the very first book to deal with this problem using this approach.

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