Castalia S.r.l.
tel. +39.2.26681083
fax. +39.2.26681876

March 2018

The book Steel Connection Analysis is in for being available in printed version.

This book will greately help to understand the logic and content of CSE.

CSE version 8.20 delivered. Important improvements and new features released, like the exchange of renodes, the direct link to 3D printing, and the CSE MASTER-READER mechanism. More important new features are coming.

CLASS4, the application related to effective cross-section evaluation has been translated into English, and is available for purchase. This application is very useful when class 4 cross-section must be checked for resistance.

Paolo Rugarli has edited the new Italian printed version of Norme Tecniche per le Costruzioni 2018, the Italian technical standards referring to constructions (see here). In the foreword Mr Rugarli has pointed out the lack of reliability of PSHA (Probabilistic Seismic Hazard Assessment), to evaluate seismic hazard. All the four last earthquakes in Italy, L'Aquila, Emilia, Ischia and Amatrice-Norcia Visso, have shown registered shakings much higher than those suggested by PSHA laws using "return periods" and other such tricky concepts. We endorse the use of NDSHA.

February 2018

Castalia srl has become authorized reseller of the 3D printers Zortrax. A strict link between CSE and Zotrax printers has been set up. 3D printing and connection design are related as 3D printing helps to study the best design solutions.

January 2018

The corrected proofs of the book Steel connection analysis have been delivered to the publisher John Wiley & Sons. The book will have 520 pages. Here the link to the publisher's webpage. The book has been a huge effort that made year 2017 very busy with it. Now, a new intense period of developing is forward, with several important and brand new tasks in the pipeline. The book is the first to cover steel connection analysis from a general viewpoint, and proposes new approaches and new terminology to deal with the problem of connections (e.g. all the jnode analytics is brand new). It is the result of more than 15 years of independent research.

CSE version 8.04 delivered.

Sargon v. 12.70 delivered, converging to a better seamless interface with CSE: the aim is to automate connection creation. While some features of CSE have appeared in other software, CSE is still the unique software in the world to directly import a whole model, recognize equal (j)nodes, assign parameterized connections to them, and to manage in a unique standardized manner all the connections of a whole structure.


During this period the book Steel connection analysis has been prepared for printing (copy editing, index, proofs correction).

New versions of CSE and Sargon have been released.


It has been confirmed that the book Steel connection analysis has been fully accepted by John Wiley & Sons, and forwarded to the production branch. The book will have 490 pages, hardcover, and will be in colour. Also electronic versions will be available, both in ePUB and PDF formats. CSE version 8.0 is in for being released.

APRIL 2016-MAY 2017

During this time span the book Steel Connection Analysis, by Paolo Rugarli, has been written and delivered to the Publisher John Wiley & Sons. The book is an extended work written in English language. It explains the theoretical background of the software CSE and the results of the research carried on by Castalia srl about steel connection analysis. Here the link to the page of the publisher, presently not yet completed: the book is currently being produced). At this page more information about the volume in a local page.

During this time span the numerical kernel of CSE has been furtherly tuned, in parallel with the book.


Computer Control Systems CCS and Castalia srl have signed an important exclusive distribution agreement referring to our key product CSE. The agreement refers to Algeria, Belgium, France, Greece, Luxembourg, Maroco, Switzerland and Tunisia.


Professor F. Giuliano Panza and Dr. Antonella Peresan have finished a divulgative book dealing with Seismic Hazard Assessment, and the book will be published by EPC Libri, Rome, in the Series edited by Paolo Rugarli I Diagonali. The book, written by two of the leading world-wide experts in seismic hazard assessment, explains in detail why PSHA (Probabilistic Seismic Hazard Assessment) is not reliable and how NDSHA (Neo Deterministic Seismic Hazard Assessment) works. The book has been many times asked to the Authors by Paolo Rugarli, as necessary reference for non experts decision makers.


Writing of the book Steel Connection Analysis moves forward: chapters 1 (Introduction), 2 (JNodes), 3 (A Model for Connection), 4 (Renodes), 5 (The Pillars of Connection Analysis) have been completed. It is now being written chapter 6: Connectors.

JULY 2016

Released version 7.20 of CSE.

JUNE 2016

Paolo Rugarli has signed an agreement with John Wiley & Sons to publish a book dealing with "Steel Connection Analysis". The book will explain the methods used by CSE and will be available from May, 2017 (it is currently in preparation) here.

MAY 2016

Released version 7.0 of CSE with important improvements in the interface and in the interfaces to other softwares.

APRIL 2016

New book in the series published by EPC named The Diagonals  edited by Mr Rugarli, the volume is "Sismografia Storica"  by Prof. Piero Pierotti.

MARCH 2016

New paper presented at the conference Law and Science, held in Rome on 9th and 10th March 2016, at the Accademia Nazionale dei Lincei. The paper is Law and Science: Les Liaisons Dangereuses, by Prof. Giuliano F. Panza and Ing. Paolo Rugarli.


Castalia starts a new activity: 3D printing and prototyping. Mr Stefano Rugarli got the 2nd level certification ( advanced) in using Rhinoceros, by Mc Neel, attending to a course in Rome, at Italian Mc Neel offices, held by Mr Giuseppe Massoni.


New book in the EPC series The Diagonals  edited by Mr Rugarli. The volume is "Analisi Modale Ragionata II^ Edizione (Reasoned Modal Analysis IInd edition)"  by Paolo Rugarli.


It is now 25 YEARS since Castalia srl establishment: 1991-2016. During the year special actions are expected.


Released version 6.92 of CSE.

New book in the EPC publisher series the Diagonals  edited by Mr Rugarli: "Seismic Design of Buildings"  by Edmund Booth, translated from the English and published by ICE.


Released the new versions 11.8 of Sargon and 6.88 of CSE.

On 3rd and 4th of November Mr Rugarli was at the conference "Resilience of Art Towns to Earthquakes"  at the l'Accademia Nazionale dei Lincei in Rome, with a paper title "The role of the Standards in the invention of the truth".
Click here to get the paper.


Released new version 6.86 of C.S.E..

Next November 3 Paolo Rugarli will be participating to the conference "Enhancing Resilience of historic cities to earthquakes" organized and held by the Accademia Nazionale dei Lincei in Rome. His speech will be about the role of technical regulations in the invention of truth.

MAY 2015

Price lists of C.S.E. have been modified: the new Standard version is now available, an intermediate version between the Full and the Light Premium one. Acquiring a version with the free placing of the components is now easier.
Released new version 6.31 of C.S.E..

MARCH 2015

Released new version 6.20 of C.S.E..


Released new version 6.0 of C.S.E., including the new "Universal Nodery", a unified database of connections. Customers can add their own Nodes to the Nodery and share them with others. With the passing of time a wide archive will take shape.


The new book by Paolo Rugarli "Structural Validation - Vol.1: General Aspects" has been published with EPC Editore, Rome. Available only in Italian for now.

JUNE 2014

Released new trial version of C.S.E. Light Entry without any limitation but that of the 30-day duration on a single machine.

MAY 2014

Released new version 5.80 of C.S.E..
We have been working at non linear solver to add geometric non linearity (i.e. buckling via non linear analysis, also possibly with material non linearity), and to add contact non linearity (i.e. the bearing surface may be considerered now a problem unknown, when dealing with the fem model of set of components).


The Standing Committee On Structural Safety, SCOSS, (UK) gives notice in its newsletter nr. 34 on April 2014 (page 3) that, following a report presented by Paolo Rugarli, a company in Italy whose advertisements included phrases such as “seismic engineering for all” and “why strain yourself for buildings up to 4 floors”  has been fined for misleading advertising.
The AGCM (Autorità Garante per la Concorrenza e il Mercato, Authority Regulating Market and Competition) fined the company 10,000 euros for “misleading advertising”. As far as is known this is the first time in Italy, and quite possibly anywhere else, that an Official Regulatory Commission has issued a fine for a misleading advertisements related to structural engineering software. The Italian Regulatory Agency has, in addition, indicated that no “absolute validation” of any software is possible.
As SCOSS comments: "As ever the designer must be aware of his or her responsibilities when using software or even books containing formulae. If something goes wrong the supplier/ designer of load tables is not held to account but the engineer responsible for using products is. Checking of software by separate programs or approximate manual calculations is usually advisable, and software cannot replace the engineering judgment of a competent professional. The implication of this Italian ruling in other jurisdictions remains to be seen."


Our advertising on MSC Magazine November issue is at page 48.


Restyling of our website: graphics and aspect improved. More modifications are in progress.
Our advertising on MSC October issue is at page 53.


Castalia is advertising for the first time on Modern Steel Construction, AISC magazine. The ad is about our software C.S.E., Connection Study Environment, and published at page 50 of September issue. The advertising will be repeated on October and November issues.

JUNE 2013

New interfaces to MIDASTM and to RISA3DTM have been added to CSE.
SIMULSOFT, the MIDAS distributor for Spain and Portugal, has become the new distributor of CSE for Spain and Portugal.

APRIL 2013

The new buckling sover has been added to the set of solvers available for CSE. FRAMETEC has become authorized reseller of CSE for Brazil.


Very important step forward in CSE  developing: the program is now able to automatically prepare the finite element models of aggregates of components, or of the whole node. See press release for more details.

DECEMBER, 19, 2012

Released new version 4.90 of  CSE. The new version adds the BS-5950 standard and the new interface to the ASCII file format .SR4.

NOVEMBER, 29, 2012

Released new version 4.80 of  CSE. The new version adds the interface to program STAAD PROTM.

OCTOBER, 20, 2012

Released new version 4.75 of  CSE. The new version adds an automatically created report in ePUB file format.

SEPTEMBER, 15, 2012

Released new version 4.70 of  CSE. The new version adds the interface to program STRAPTM.

AUGUST, 1, 2012

Released new version 4.60 of CSE. The new version adds the program SAMBA to the CSE FULL package, for free. Now CSE users will be able to manage their own cross-sections database, adding hundreds new cross-sections to the more than 15,000 already available.
The August issue of Modern Steel Construction, the worldwide well-known AISC magazine, has just been released: in the What's Cool section, page 53, CSE  existence and availability is acknowledged. We are currently searching for distributors in the Americas.

JULY, 3 2012

AISC informs that Modern Steel Construction August issue will include a short note about the existance of CSE ("Choose your own connection").

JUNE 24-30, 2012

Trip to Singapore (wow!) and meeting with CSE Asian distributor  Mr Meda Raveendra Reddy. During the 5 days stay in Singapore the program CSE has been explained to Customer Chan W Y Consultants. Besides some demo of the program to possibly interested Structural Engineers have been set up. Presently the number of copies of CSE sold in Singapore are 3.

There has been quite a lot of interest about the program, which is confirmed to be unique as to the generality of the approach to the steel connection checks.

JUNE 2012

Released the paper "La valiunzione del calcolo strutturale", by di Paolo Rugarli. The article discusses some validation activities set up by a University and a Research Company, showing how these validation activities miss quite important features. The paper has been cited by several opinion makers (SEWC, Ordine degli Ingegneri di Milano), and states some very important general rules (validation should be possibly controlled by anyone, should not be a "secret"; it's impossible to validate in an absolute way stating that a program "executes in a reliable way" some computational task as validation may not prove a program to be error free).

MAY 17 2012

Released and available  CSE LIGHT VERSION.

APRIL, 5 2012

The web site has been deeply revised adding more pages, more products, and translating more pages into English.

MARCH, 7 2012

CSE: a first set of 47 English multimedia lessons have been released. Here is the link: CSE ENGLISH LESSONS WITH AUDIO. The light version is almost ready. The scheduled release is by April, 15. There will be a BASE LIGHT version, an ADVANCED LIGHT version, and a PREMIUM LIGHT version. Prices have not been decided yet, but they will be considerably lower than those of full version. The light version is for standard connections only.

NOVEMBER, 22, 2011

CSE FULL version 4.40 released. Very important new features and improvements. The English documentation is ready and available. Version 4.40 is able:
i) to execute elastic-plastic analyses of components;
ii) to build up steel connections using a standard connection database (presently 170 units) so that creation is automatic;
iii) to store new connections in the parametric connection database, by setting up connections parametrically.

Many more new features are not listed here.

New LIGHT version release is scheduled by the end of March, 2012.

SEPTEMBER, 7, 2011

CLASS4 has been released. It is presently in Italian only but it is planned its translation into English. It's a low cost program very helpful for steel designers.

JULY, 2011

The new software program CLASS4, dealing with the effective data computation of typical steel cross-sections, has been completed (presently Italian only). The typical cross sections are: IPE, HEA, HEB, HEM, RHS, Tee, UPN (channels), C, Z, L, W cold formed, with no edge fold, single edge fold, and double edge fold.
The parameterized typical connection database of CSE has reached 150 units.

JUNE, 2011

Added about 90 test schedules referred to the new non linear FEM solver CURAN. Released Sargon version 9.70, with important enhancements of the non linear solver CURAN (truss elements with gap, non linear springs with gap) and with the addition of the effective area computation of the thin-walled cold-formed members, thanks to the general software tool set up one year ago.
An intense developing activity has been ended, aimed at adding very important new features to the software CSE: 1) the ability to create parametric steel joints or parametric steel connections (PRenodes, parametric real nodes); 2) The parameterization of the typical steel joints / steel connections; 3) The creation of a typical steel connections database that can be used allowing the node creation by two clicks; 4) The creation of a CSE LIGHT version, which will be later released: it  will only be able to deal with typical joints (while the full version enables the free creation of joints and connections). We are presently adding typical connections to the database.


The new non linear solver CURAN development process moves forward with the addition of the plate-shell (thick and thin) non linear finite elements, and membrane elements. Nonlinear plate elements model will be solved using CURAN by CSE, which will now be able to deal with elastic-plastic analyses of components like angles, plates (base or end), members with work processes, and so on. New validation schedules (about 100) dealing with non linear analysis will soon be added to related the web site section.


CSE is now fully in English.
New standards have been added to CSE: these are IS 800 (Indian standard) both limit states and working stress, and AISC-ASD and AISC-LRFD 2005, i.e. USA standard both for allowable stress design and for load and resistance factor design.

Agreements have been signed by Castalia srl with NOMITECH (based in Athens, Greece), and with RAM CADDSYS PVT. LTD. (based in India at Chennay). See the distributor page for more detail. CSE will be distributed in several East Countries and in Greece and Cyprus.

CSE has been extensively used to check the new Mediateca (Media House) in Colle Val d'Elsa (Siena) design by Jean Nouvel, structural design by Ingg. Galluzzi. CSE has been used to check some of the steel connections of this very complex structure.

New features have been added to the program CSE. The English version of the guide has been pre-released (ver. 4.04), and is going to be aligned to version 4.10 by the first half of September.
JUNE 2010

Ing. Paolo Rugarli, Castalia's owner and technical Director, is going to edit the Italian version of the series "Designers' Guide to Eurocodes", originally published by Thomas Telford, London UK. The first books will be in print by September 2010. Ing Rugarli is also in charge of translating into Italian the first book of the series, Designers' Guide to Eurocode 0 EN 1990: basis of structural design, by Profs. H. Gulvanessian, J-A Calgaro, and M. Holicky.
MAY 2010

Many news in the last six months. CSE has now several tutorials in English. The demo version of CSE will be released shortly, as docs will be translated into English. Estimated release time for demo version is mid of June 2010.

The book Structural Analysis with Finite Elements, by Paolo Rugarli, is going to be published at the end of the month.

Tutorial for Sargon are being prepared in English language. They will be released shortly.


The first version of is released.

The website will be gradually expanded as main Castalia website. Our production, which is currently in Italian, will be gradually translated into English.