Sector: Heritage

Christchurch Town Hall

Acclaimed world-wide for both its architecture and acoustics, the Christchurch Town Hall holds a special spot in Cantabrian hearts. Its position at the centre of the new Performing Arts precinct reinforces its status as a premier gathering place for both performances and events.

As a result of the devasting 2010 and 2011 earthquakes, and due to the land damage beneath, the Town Hall required the strengthening of foundations and damage repair to the original design. For Holmes, this NZ $167M+ conservation project was both technically complex and interesting. With significant portions being upgraded, repaired and restored, and additional areas undergoing a complete rebuild—this project offered the full spectrum of structural and geotechnical challenges. Holmes collaborated with the geotechnical engineers to design a new foundation raft atop ground improvement that tied the existing building elements together and provided additional resilience to the complex. Through high end analysis we’ve minimised the strengthening work required for the superstructure to achieve 100%NBS—an achievement we’re incredibly proud of!

In addition to the excellent engineering we achieved, we aimed to help preserve the original character and style of the building with its white marble, dark timber, rich red fabrics and vibrant artworks–because it was important to our client. Maintaining the original identity of the building provides a tangible link to ‘prequake Christchurch’, and Holmes was delighted to be involved with the preservation of such an iconic building.

In 2021, the project won the highly coveted and exclusive ‘Supreme Award’, at the 2021 Structural Awards by The Institution of Structural Engineers. It also won its nominated category ‘Structural Heritage’ too.

The Hotel Britomart

The Hotel Britomart is the first eco-friendly hotel to hit Auckland, providing the city’s thriving tourism industry with a boutique offering that seamlessly blends sustainable features into an indulgent yet comforting atmosphere. Opening its doors in mid 2020, The Hotel Britomart incorporates a new 11 storey building and the refurbished, adjoining Masonic and Buckland buildings. The hotel offers 104 rooms, mixed use commercial space and administration on the ground floor, and a gym in the basement.

As the first property company in New Zealand to join the Green Star Performance rating system, Britomart successfully achieved a 5 Green Star rating during its design and build as well as its Green Star Performance accreditation since operating. This was achieved through the choosing of sustainable materials, incorporating reused concrete and recycled water through and passive design.

This project allowed our team to provide our client with a unique level of service through our collaboration with all our Holmes engineering practices including Holmes Solutions. The team from Holmes provided valuable insight into the structural elements of the design while Holmes Solutions undertook full scale testing of the precast façade panels incorporating pieces of brick.

Rigorous cooperation with the other stakeholders was required to successfully navigate the complexities of upgrading a heritage structure to current fire standards while adhering to sustainability and design requirements. The Fire Engineering strategy for The Hotel Britomart utilised smoke modelling to assess the most effective solutions for the project. Given the hotel’s height and occupancy requirements, one of the main challenges was the single stair. Through smoke modelling and egress calculations Holmes Fire showed that the stair achieves the fire safety performance requirements. The single stair was an important part of the design as it maximised the floor area available for hotel rooms.

The refurbishment of the existing Masonic and Buckland buildings included additional structural support, fire rated separations, smoke sealing and sprinkler protection.

 

 

44 Martin Place

The historic MLC building is a prominent sandstone icon of Martin Place. The heritage listed commercial development, located in central Sydney CBD was originally built in the 1930s, and has previously undergone redevelopment in the 1980s.

The building has recently undergone redevelopment to incorporate a large feature atrium through the centre of the building and add two new storeys above, using Cross Laminated Timber (CLT). The building required a bespoke fire engineering strategy that had to consider the heritage nature of the building and the specific requirements by the building owner to have an open atrium and highly interconnected working space.

Holmes previous experience with atrium design and our established relationship with local Fire Brigades allowed our team to provide the client and design team with specialist fire safety advice that shaped the atrium design to satisfy the safety requirements whilst also staying sympathetic to all other stakeholder objectives. The resulting design ticked all the boxes in terms of architecturally beautify, architecturally functional, flexible to accommodate tenant fitouts and robust enough to deliver occupant safety in a fire scenario. Specifically our design adopted horizontal fire curtains at the base of the atrium void thereby separating out the Ground Level portions and providing flexibility for the use of this Ground Level space to include a café, displays and decorations.

Structural Fire Engineering was also utilised to rationalise and optimise the level of protection to be applied to the mass timber structure while ensuring that structural stability and occupant life safety is maintained. Advanced finite element modelling is being used to establish a holistic and cost effective re-mediation strategy to the dilapidated existing steel concrete composite structure, which does not comply with the most recent fire standards.

Isaac Theatre Royal

The Isaac Theatre Royal is one of Christchurch’s most iconic heritage buildings, and the Grade-A heritage listed theatre was badly damaged in the 2010 and 2011 Canterbury earthquakes. The project included the rebuild of a large portion of the structure while retaining the historic unreinforced masonry façade, ornate plaster ceiling dome and the entrance feature marble staircase.

Two major constraints on the project were the fixed $40M budget and the opening date for the first show. The theatre needed to be open for the 2014-2015 summer show season to keep key staff on. This required the design and construction to occur in two-thirds of the time of a conventional project. Holmes were the structural and fire engineers for the rebuild, and it became the first major entertainment venue to reopen for business in the CBD following the 2010 and 2011 earthquakes.

Fire Engineering

Holmes was brought into the project during construction to review the existing Fire Engineering Strategy provided by another consultant. Through performance based design we were able to present a robust solution on schedule and on budget.

The new Fire Engineering Strategy was produced within three months of engagement. The fire engineering design process also included:

  • Collaboration with the University of Canterbury to develop a new egress modelling tool for Holmes Fire use, which could undertake the buildings comprehensive egress assessment of merging crowd spaces;
  • Development of a fire strategy which considered an alternative compliance with the New Zealand Building Code in order to maintain the original architectural vision of a building designed over 100 years ago;
  • A hands-on approach to proactively integrate the Fire Strategy with the operational needs of the Theatre.
  • Consideration to Safety in Design, which included the physical practicality of installation and maintenance of the proposed fire strategy; and
  • Implementation of a complex fire and security interface which included multiple tests and training of theatre staff.

The design team had a vision of reviving the building to its original design including several key heritage features such as the auditorium dome and plaster detailing, marble stairs, and Edwardian façade. The dome and plaster detailing, in particular, relied heavily on our assessment.

Using smoke modelling tools, we were able to eliminate the need for the existing motorised smoke curtains covering the full width of the theatre adjacent to the dome. This also allowed the client to remove all of the access gantries and maintenance of the system.

Throughout the project, we were able to work collaboratively with the client to provide a unique, performance-based solution tailored specifically to the needs of the heritage building.

Structural Engineering

The tight construction period was achieved through the use of information sharing with the contractor and other consultants in the form of 3D Revit models, a close working relationship with the contractor, and looking outside the box in terms of materials (such as shotcrete) and construction sequencing.

The Theatre’s fixed budget consisted of insurance money and various grants and fundraising commitments. A key part of managing the budget was cost certainty during the design phases. The use of 3D drawings allowed the quantity surveyors to more easily identify pinch points and difficult areas, especially with regard to conflicts with heritage fabric. This helped to identify, manage and reduce these high risk cost areas throughout the project.

Nearly all the unique heritage features of this building were saved and carefully restored by skilled craftsmen—leaving the theatre in a better condition than it was pre-earthquake.

Jubilee Place

As part of the transformation of the Fortitude Valley in Brisbane, this composite steel building will project outwardly with a externally braced load-bearing diagrid structure resembling a large steel web. The development has a strong focus on the people and their experience in the building. This project has prioritised environmental conscious design by setting the bar high in terms of sustainability targets, achieving a six-star Green Star, five-star NABERS and Gold WELL Building Standard.

The structural fire engineering of the building is a key aspect to the design, as the unique and complex nature of the building dictates a first principles approach to be followed when designing for fire safety. The structural fire engineering team developed a holistic fire safety design that removed unnecessary and redundant passive protection, quantified actual building behaviour under fire and building loads, and provided a defensible and robust pathway for building approval.

Additional fire engineering solutions where also developed throughout the building to enhance occupant safety and usability, to mitigate the risk of fire spread between properties, and to specifically design a bespoke passive fire protection strategy for the building.

Jubilee Place as a result, will not only be an architectural statement but also become a precedent for good fire safety design utilising advanced Structural Fire Safety principles to encourage more unique and innovative designs.

Auckland Art Gallery Toi o Tāmaki

The Auckland Art Gallery is an iconic and much-loved part of the city’s cultural heritage. When the gallery needed to seismically strengthen and refurbish the buildings, including fire safety design—which were built in 1888 and 1916 respectively—they trusted the challenging work to Holmes’ expert engineers. The final part of the work was to design new space to host an ever-growing number of exhibits. This project required the technical expertise to cope with a challenging seismic ‘retrofit’, combined with the ability to match the character and style of the new space with the existing structure. The existing building – one of the oldest in Auckland – was the first municipal art gallery built in New Zealand and contains the most valuable public art collection in the country.

Retaining the building’s heritage features, sensitive refurbishment and upgrading fire safety was of utmost importance. Key features of the architectural design include the impressive four storey north atrium and the three storey south atrium. The new and refurbished parts of the building required large, interconnected open plan spaces with a high degree of openness and visual connection to adjacent galleries and atria.

Fire Safety Design

The fire safety design involved a challenging mix of conflicting aspirations. As the building has to deliver specific performance requirements, the fire safety engineered solution was equally performance-focused: innovative to suit this client and this architectural design. The regulators expressed concern about the number of design issues that were required to vary from ‘standard fire approaches’ and insisted on an extreme level of engineering justification. Holmes responded with engineering design solutions that addressed the significant challenges of this unique architectural masterpiece.

The fire engineering brief evolved over five years, with contributions from art curators, gallery event managers, international exhibition advisors, architects, security consultants, structural and mechanical services engineers, Fire Service and Auckland Council regulatory reviewers. The final fire safety strategy successfully achieved the outcomes required by the fire engineering brief.

Holmes used computational fluid dynamics analysis to model smoke movement and also evaluated the movement of people in a fire emergency, using a variety of engineering building use scenarios for safety and robustness. The primary public circulation routes are also used as principal fire egress routes (allowing fewer dedicated egress stairs than prescriptive regulatory requirements). Holmes coordinated a detailed review of fire protection requirements in all areas storing and displaying art. Holmes designed the systems controlling fire and smoke spread to protect the building, the art collections and the building occupants. ‘Standard’ solutions for exit signage and security on exit doors were modified to suit the specific requirements for this building.

Seismic Strengthening

The seismic strengthening work started rigorous assessment of the building’s structural needs, drawing on market-leading modelling technology to identify potential weaknesses. The strengthening solution focused on minimising the impact on existing heritage features, creating a robust, resilient structure for the future. The new space included three galleries and two new roof level sculpture terraces, and the addition of a three storey glass atrium structure with a tension rod façade system and tree-like canopies that define and cover the entry forecourt, atrium and gallery areas.

Auckland War Memorial Museum

Tāmaki Paenga Hira/Auckland War Memorial Museum is one of New Zealand’s iconic heritage buildings. It is a treasured part of Auckland’s cultural heritage, ‘telling the story of New Zealand’ to a huge number of local, national and international visitors. It’s a site of enormous cultural significance, occupying a commanding position on Auckland’s skyline.

When the structure of the museum needed to be seismically strengthened and modernised, Holmes technical design experts were the logical choice. Our design of this multi-award winning project integrated dramatic architectural and engineering features into a world class facility, bringing a national heritage building into the 21st century.

Structural Strengthening and Fire Design

The museum redevelopment was delivered in two major stages over 12 years. The first stage comprised a well-crafted refurbishment of the existing Historic Places Category I building and exhibition design for all of the gallery spaces. Significant earthquake strengthening and securing works were also undertaken, carefully integrated with existing heritage spaces to preserve the elements that make the building so distinctive and compelling.

The second stage, the Grand Atrium Project, delivered an ambitious, four storey, seven hundred tonne suspended building within the existing courtyard.  An adjacent two-level underground visitor car park was also developed, and overall floor space was increased by 60%. Two storage and curatorial basements were added beneath the stunning ground floor atrium. By utilising a wide variety of performance-based fire engineering design methods, specifically tailored to the constraints imposed by the building’s configuration and uses, Holmes optimised the performance of the egress routes within the addition, minimised the amount of applied fire proofing needed for the structural steelwork and verified the extensive use of architectural timber lining.

Finally, teaching and performance spaces situated within the suspended ‘bowl’ are crowned by the spectacular events centre, under the feature wave dome roof.

Holmes’ engineering services enabled the architect’s original vision for the project to be realised with a minimum of compromise and in a manner that significantly exceeded the client’s expectations.

Australis Nathan Building

These historic buildings, built in 1903 and 1904 were originally warehouse and storefronts for importers and merchants, fast forward over 110 years and these have been transformed to bring these heritage buildings back to life. Australis House and the Nathan Building was an ambitious refurbishment combining the two buildings to function as a single structure and repurposed them to include high end retail, hospitality and office spaces. These buildings had strong character with a combination of cast iron columns, heavy timber columns and beams, timber floors with herringbone bracing and impressive brickwork.  

Our brief on this project was to avoid providing ceilings beneath these floors and encasing these columns in order to celebrate these features. Our performance-based design solution involved a combination of sprinkler installation, assessment of inherent timber strength and application of clear intumescent coatings to achieve sufficient fire separations within the building and achieve Building Code compliance.

Sydney Town Hall

The iconic Sydney Town Hall is a heritage listed, 1860’s High Victorian style building containing three halls as well as administration areas and the Mayor’s office. The halls are used for events staged by the City of Sydney Council and are also hired out for functions.

The project involved refurbishment works integrated with an extensive fire safety upgrade of the entire building. The key client objectives were increasing the level of fire and life safety and heritage asset protection. The building was required to be partially occupied during the upgrade process.

Holmes worked with the design team including architects, heritage consultants, the NSW Fire Brigades, fire service contractors and The City of Sydney, to formulate a Fire Safety Upgrade Strategy that would achieve the fire safety objectives without altering or destroying the building’s unique heritage fabric and artefacts.

Our team of fire engineers provided solutions to resolve fire safety issues related to occupant egress, fire separation of the stairs and lift shaft, fire hydrant provisions, fire hose reel design, sprinkler design and smoke exhaust. Due to the unique nature of the project and heritage significance of the building, these solutions were developed to not only exceed those of the Building Code of Australia Performance Requirements but also be respectful of the ornate features of the building. Essentially the solutions were created to be in-keeping with the original design so visitors of the space weren’t detracted by the beauty of the building with modern fire systems.

During the construction review process, Holmes developed a number of interim fire safety strategies to resolve critical fire safety issues that were temporarily created during construction.

Throughout the project, Holmes’ role enabled the client to significantly improve the level of fire and life safety and property protection for the refurbished heritage building. This was achieved by delivering interim and final fire safety solutions that met regulatory and stakeholder requirements whilst being heritage sensitive, timely and affordable.