About Kiernan Structural Steel

Kiernan Structural Steel, one of Ireland’s leading structural steel firms, has adopted IDEA StatiCa in 2016, only a few months since the software was introduced in the market – having seen straight away its potential to speed up the connection design process. Since then it became their main connection design software for almost all of their connection designs.

About the Curragh Racecourse Redevelopment Project

Written by:
Mirivano Carrig & Stephen McKenna
Structural Engineers at Kiernal Steel

The Curragh is an internationally recognized horse racing venue situated in Ireland. Kiernan Steel were involved in the project to design the steel connections and erect various ancillary buildings including the new center-piece spectator grandstand which comprises of a cantilevered structure on three elevations of the roof. This new grandstand includes such five-star facilities such as restaurants, bars, corporate areas as well as superb spectator viewing areas.

The challenges

Prior to adopting IDEA Statica in April 2016, Kiernan Steel, like so many other designers, had to resort to using simplified connection design software which, due to their assumptions, often meant that plates and welds were larger than (what we now know) was required.

Not only this but the rigid guidance rules adopted by the Eurocodes means that only conventional and standard connections could be calculated and anything which was out of the ordinary, had to be calculated manually using engineering judgment and a degree of conservatism. To this end, we like so many other designers, would use the power of excel to create spreadsheets to automate this process for us. However, this tends to create a “black-box” approach whereby it is very difficult for someone else to check the calculations and validate the results.

We then were introduced to IDEA Statica and straight away saw its potential to speed up the connection design process. In the beginning, we used conventional software for simple connections and used IDEA to create unorthodox connections. However, over the years, IDEA Statica has quickly become our main connection design software which we use for almost all of our connection designs.

Project introduction

The huge 7200m2 cantilevered roof design is the culmination of both structural artistry and architectural vision and is a project which Kiernan Steel are very proud to have been involved in. The roof of this grandstand has cantilevered spans ranging from 27m up to 45m in the double cantilevered areas meaning that this grandstand is the largest cantilevered roof of its kind in Ireland.

Kiernan Steel was not only tasked with erecting this roof, on the contrary – our responsibilities on this project ranged from connection design, steel detailing, clash detection, fabrication and intumescent painting to name but a few. We were able to achieve these tasks all within a very congested 6-month window which saw us design the connections for the complicated structure shown below.

Due to the complex nature of the project, Tekla & IDEA Statica were used extensively (and often in tandem) to design connections for the 1100 Tonne Steel roof, which were required to not only carry out their structural function, but could also be fabricated, and installed on-site, whilst still within the slender profile of the roof structure.

To this end, Kiernan Steel had to allow for Mechanical access and equipment in and around their connections and so it was crucial that not only was the connections as small as possible – but also precision was paramount in the design and detailing of these same members, particularly at the Nodal connections where several cantilevered trusses converged onto a single point.

Currently, Kiernan Steel has been nominated and won their entry into TEKLA’s 2019 BIM awards for Sports and Recreation Projects using the Curragh Redevelopment Project as its entry. Using IDEA Statica and the BIM capabilities of Tekla Structures on this prestigious project really made Kiernan Steel stand out in the competition.

Use of IDEA StatiCa

Kiernan Steel was very fortunate that IDEA StatiCa has been tried and tested and vastly improved over the years. The ability of the software to design quite literally any type of connection has made it the go-to software of choice for modeling any type of connection from the very simplest to the most complex.

The use of IDEA StatiCa for this project proved to be no different. In fact, IDEA StatiCa was the sole connection design software used on this project. In addition, Kiernan Steel praises the hard work of the IDEA technical support team for their vast knowledge and swift responses on all areas relating to connection design. IDEA Statica really proved beneficial for us when it was used to design two of the Nodes which support roughly a third of the entire roof area. These Nodes had hundreds of loadcase combinations and weighed a massive 30 Tonnes each. The use of IDEA Statica allowed for the most economical and efficient design of these two Nodes to be possible.

Results

IDEA Statica has allowed us to design connections much more confidently, knowing how the forces create different stress patterns on members and being able to see visually the effects the correct stiffening arrangement has on a connection. Since using IDEA we have seen an increase in efficiency of welds and plate sizes as well as an increase in connection design output which ultimately ensures that the client is getting the highest quality product possible in the shortest of time frames.

In addition, being able to virtually see the connection prior to it being implemented into a model means that we can envisage potential clashes ahead of time so that we can problem solve quickly and more efficiently than ever before. To this end, we believe that through the use of IDEA within our company we have been able to streamline the process between the concept stage to the design and fabrication stage by making use of the speed of connection design as well as being able to transfer connection design templates from other areas within the project into a single IDEA Statica file.

About the authors

The connections for the main grandstand of the Curragh was designed by Kiernan Steel’s Structural Engineers – Mirivano Carrig & Stephen McKenna. Combined, their experience in the steel construction industry exceeds 15 years and continues to grow. Over the years, they’ve used the power of IDEA StatiCa to create and solve a whole raft of connection types – ranging from the very simple to the very complex.

With a wealth of technical knowledge and constructability techniques, they use their skills to ensure that every building is designed so that it is the most efficient it can be as well as ensuring that it has as little issues on-site as possible whilst maintaining the quality and health and safety ethos of the company.