Ties
Contents |
[edit] Introduction
In engineering, a tie is a linear structural component that has tension acting upon it, stretching it or pulling it apart.
Ties can be made from any kind of material that is able to resist tension. In order to function properly, ties must be adequately anchored.
[edit] Ties and struts in trusses
The counterpart of a tie is a strut, which is a structure that has compression acting upon it - pushing it together. For more information, see Strut.
Ties and struts are common components of structural elements such as trusses. The two components work together to support the weight of other parts of the structure and any imposed load. The struts generally provide compressive load-bearing capacity, but sometimes also contribute to tension resistance. Ties perform the opposite function and are sometimes referred to as tension members
[edit] Types of ties
Ties may be referred to as straps, tie rods, eyebars, suspension cables, wire ropes and so on.
There are many specific types of ties (taking varying degrees of tension), including:
- Cable tie. A cable tie is a long, thin strap made from nylon or stainless steel, which can be pulled into a loop and tightened to hold together cables, wires and other objects. It is a very simple design that is extremely effective, easy to use and very versatile. For more information, see cable tie.
- Railroad tie, crosstie or railroad sleeper is a form of support used for railroad tracks. Traditionally made from wood, railroad ties are sometimes used in the construction of retaining walls also known as sleeper walls. For more information, see Retaining sleeper walls.
- Tie bar. A horizontal metal bar supporting a window structure, spanning the entire width of the window, usually at springing level. It pierces and passes through any mullions.
- Tie beam. A horizontal beam connecting two rafters in a roof or roof truss.
- Tie stone. A large stone (also known as a bond stone) which passes through a wall from one side to the other. The purpose of the bond stone is to lock the layers of the wall together and reinforce the structure. For more information, see bond stone.
- Tied scaffolds. These are independent scaffolding structures that are connected (using some form of tie) to an adjacent, permanent structure for stability. The selection of tie positions should be tested and checked before use and the suitability of the permanent structures composition to carry the ties should be analysed. Common tied scaffolding methods include: through ties, reveal ties, box ties, lip ties and so on.
- Wall tie. Wall ties (sometimes referred to as brick ties) are strips or bars made of metal that span the cavity and tie the internal and external walls of bricks or blockwork together. For more information, see wall ties.
- Catenaries.
- Cables.
- Wire rope suspension systems.
- Tension cable and rod connectors.
- Ground anchors.
There are also ties that are specifically engineered for extreme weather conditions. These include hurricane ties and seismic ties.
For more information see: Tensile structures
[edit] Related articles on Designing Buildings
Featured articles and news
Professional practical experience for Architects in training
The long process to transform the nature of education and professional practical experience in the Architecture profession following recent reports.
A people-first approach to retrofit
Moving away from the destructive paradigm of fabric-first.
International Electrician Day, 10 June 2025
Celebrating the role of electrical engineers from André-Marie Amperè, today and for the future.
New guide for clients launched at Houses of Parliament
'There has never been a more important time for clients to step up and ...ask the right questions'
The impact of recycled slate tiles
Innovation across the decades.
EPC changes for existing buildings
Changes and their context as the new RdSAP methodology comes into use from 15 June.
Skills England publishes Sector skills needs assessments
Priority areas relating to the built environment highlighted and described in brief.
BSRIA HVAC Market Watch - May 2025 Edition
Heat Pump Market Outlook: Policy, Performance & Refrigerant Trends for 2025–2028.
Committing to EDI in construction with CIOB
Built Environment professional bodies deepen commitment to EDI with two new signatories: CIAT and CICES.
Government Grenfell progress report at a glance
Line by line recomendation overview, with links to more details.
An engaging and lively review of his professional life.
Sustainable heating for listed buildings
A problem that needs to be approached intelligently.
50th Golden anniversary ECA Edmundson apprentice award
Deadline for entries has been extended to Friday 27 June, so don't miss out!
CIAT at the London Festival of Architecture
Designing for Everyone: Breaking Barriers in Inclusive Architecture.
Mixed reactions to apprenticeship and skills reform 2025
A 'welcome shift' for some and a 'backwards step' for others.