engineering

Pres-Lam

Pres-Lam is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Pres-Lam rather than just read about it. In short: Pres-Lam is a method of mass engineered timber construction that uses high strength unbonded steel cables or bars to create connections between timber beams and columns or columns and walls and their foundations. As a prestressed structure the steel cables clamp members together creating connections which are stronger and more compact than traditional timber fastening systems.

Key takeaways

Pres-Lam belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Pres-Lam to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pres-Lam from memory before moving on to harder problems.

Reference excerpt

Pres-Lam is a method of mass engineered timber construction that uses high strength unbonded steel cables or bars to create connections between timber beams and columns or columns and walls and their foundations. As a prestressed structure the steel cables clamp members together creating connections which are stronger and more compact than traditional timber fastening systems. In earthquake zones, the steel cables can be coupled with internal or external steel reinforcing which provide additional strength and energy dissipation creating a damage avoiding structural system. Pres-Lam can be used in conjunction with any mass engineered timber product such as glue laminated timber, laminated veneer lumber or cross laminated timber.

History The concept of Pres-Lam was developed at the University of Canterbury in Christchurch, New Zealand by a team led by Professors Stefano Pampanin, Alessandro Palermo and Andy Buchanan in collaboration with PreStressed Timber Limited (PTL). The system stems from techniques developed during the US PRESSS at the University of California, San Diego during the 1990s under the leadership of New Zealand structural engineer Nigel Priestley. Beginning in 2008 a 5-year research campaign was begun under the Structural Timber Innovation Company. During this period the first examples of Pres-Lam structures were completed in New Zealand. Following the systems success, international research efforts have begun at ETH Zurich, the University of Basilicata, Washington State University and several other research institutions. In 2017 the NHERI Tallwood project was started with funding from the U.S. National Science Foundation focused on further validation of Pres-Lam in North America.

Notable structures The Nelson Marlborough Institute of Technology Arts and Media Building – The world's first Pres-Lam Building The College of Creative Arts, Massey University – Uses Pres-Lam frames to augment vertical load carrying capacity and well as high seismic loading The Kaikōura District Council building – Subjected to the 2016 Kaikōura earthquake without damage and subsequently used as response headquarters The ETH Zurich house of Natural Resources – the first Pres-Lam building to be constructed outside of New Zealand Peavy Hall – a three-storey mixed use education building under construction Oregon State University campus in Corvallis, Oregon, United States.

References

Worked examples

Example 1 — a first encounter with Pres-Lam

Start with the simplest possible case. Write down what Pres-Lam claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Pres-Lam before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Pres-Lam ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Pres-Lam

In research: Pres-Lam appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Pres-Lam in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Pres-Lam is common in secondary-school and first-year university syllabi. It links to neighbouring topics Earthquake engineering, Engineered wood, so understanding it makes those chapters shorter.
In everyday life: Look for Pres-Lam outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Pres-Lam in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pres-Lam means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Pres-Lam out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pres-Lam in simple terms?

Why does Pres-Lam matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Pres-Lam?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Pres-Lam.