**Steel Connection Analysis 1st Edition by Paolo Rugarli.**

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Contents:

Preface

1 Introduction

2 Jnodes

3 A Model for Connection

4 Renodes

5 Pillars of Connection Analysis

6 Connectors: Weld Layouts

7 Connectors: Bolt Layouts and Contact

8 Failure Modes

9 Analysis: Hybrid Approach

10 Analysis: Pure FEM Approach

11 Conclusions and Future Developments

Appendix 1: Conventions and Recalls

Appendix 2: Tangent Stiffness Matrix of Fillet-Welds

Appendix 3: Tangent Stiffness Matrix of Bolts in Shear

Index

*Around 17 years ago, at the end of the 1990s, when I started my research on steel connections with the aim of developing some reliable and general software, able to tackle, hopefully, every connection, I often felt like giving up. The problem was tremendously complex, and the general rules of mechanics difficult to relate to the problem to be faced; there was a huge gap to be bridged.*

__Preface:__Initially I thought that only a system able to learn from the analyst could deal with such a complex problem, learning ad hoc rules to be later applied, case by case. However, I was able to move some steps forward, finding what in the second chapter of this book is named the jnode, its analytics, and all the related concepts. My first useful result was detecting equal jnodes. Several years were then necessary to develop the tools needed to create the scene, that is, to place the constituents in their proper position, freely placing them interactively in 3D space, in the specific context of steel connection study. The mechanical problem of connection analysis, to be tackled with a general approach, was however still unsolved. I was prepared to develop an expert system able to learn from the user how to recognize specific subproblems to be faced, by simple ad hoc rules. This was the tentative generalization of the methods widely used by engineers, but was not the solution I was searching for.

Adopting the concept of the force packet, and recognizing that the connections could be classified as isoconnected or hyperconnected, I finally understood, in 2008, that a simplified finite element model that in this work is named IRFEM, could be used to compute the force packets flowing into the connectors for a generic set of connections. Then, by the action and reaction principle, a cornerstone for connection analysis, the forces loading the constituents could be known, and by finite element models of single constituents using plate–shells, coherent and well rooted Von Mises stress maps could be obtained. This is what I call the hybrid approach and is described in Chapter 9 of this book.

The door was then opened for the automatic creation of finite element models of constituents (2008), and from there, in 2012, to the complete automatic modeling of the whole node, using what I call here the pure fem approach (PFEM). This is seen as a special case of the hybrid approach and is discussed in Chapter 10.

What initially seemed an inextricable tangle could indeed be solved in strict observance of the main principles of mechanics and of plasticity theory.

Several issues are still to be better solved, but a general well rooted method is now available, that can be applied to every connection configuration, from the simplest to the most complex. Indeed, I think this is a useful result, because a part of the method can be implemented with relative ease.

I am well aware that several issues are pending and must still be better tackled. However, after many years of solitary work, I think the time has come to explain what I have researched and to propose my work for the attention of my colleagues. Anything can be improved, but the structural analysis problem of analyzing steel connections having a generic geometrical configuration, regardless of the number of loading combinations, is now solvable with automatic tools.

__“Paolo Rugarli”.__**Steel Connection Analysis by Paolo Rugarli pdf.**

Book Details:

⏩Edition: 1st

⏩Author: Ellen Finkelstein

⏩Publisher: Wiley-Blackwell; 1 edition (April 30, 2018)

⏩Puplication Date: April 30, 2018

⏩Language: English

⏩Pages: 537

⏩Size: 30.5 MB

⏩Format: PDF

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