The current Corona Pandemic is another indicator of the fragility of life on earth.  Climate change, and the associated environmental imbalance, are the immediate and most difficult problems humanity is facing.  Environmentally sustainable technologies like ours, below, offer rewarding development instead of prohibitive costs.


Social, economic and environmental development out of eliminating global deforestation and a fifth of climate change gases:

development out of sustainability


As the World squabbles over who should or how to pay the unbearable costs of climate change reversal, this independent charitable engineering R&D institute and public charity has come up with a profitable engineering solution to stop and reverse global deforestation.  This would cancel out 19% of global warming gases and create a forest-based sustainable economic sector that could also fund other climate change endeavors.  Nobody has ever challenged us intellectually or publically because the prevailing state-of-the-art in the use of round wood and the engineering analysis of timber structures still belong to the “slide-rule” age of the 1950s, before computers became the main tool of engineering science.


By adding value to a most abundant, renewable but largely wasted natural resource, wealth is created.  This resource is small diameter timber (SDT).  This represents over 90% of all wood fiber in nature that contributes fuel to forest fires.  SDT is too expensive to remove because it has no marketable value.


The LPSA (light prestressed segmented arch) spans the intellectual gap between pre-computer (strength-of-materials) linear theory and modern advances in non-linear continuum and computational mechanics.  It is an application of PhD research work by this Institute’s founder, Ibrahim Al-Khattat, at Stanford University.


A simple slide-fit jointing mechanism replaces current carpentry-based jointing procedures.  Result is low-cost, low-tech mass utilization of SDT as a superior alternative to commercial mature timber. Humanity may then stop destroying the forests and their irreplaceable ecosystems—profitably. End products are bridge and building structures inherently resistant to the actions of earthquakes, hurricanes and flooding.













The pictures, above,left and center, depict the engineering solution of the SDT jointing and analysis problem  through a combination of elementary physics and advanced  continuum and computational mechanics.  A 3-year old volunteer (above, left and center) slide-fits a SDT post into a prototype bridge connector socket.  Above right, is a 20m LPSA bridge assembled by school children in Iowa, USA.  In both cases, a tensioning system converts the bridge assembly into a very durable structure that is amenable to advanced analysis and performance prediction.  SDT ends are not damaged by slicing or bolting as in traditional embedding methods.

This site has been

online since: Jan 22, 1997

Last update: Jun 22, 2022

Some LPSA Awards Inc. wins the Sustainable Technology Category Award in the Global “Create the Future Design Contest” (52 countries) for: Sustainable, Durable Bridges of the Future for outstanding design & engineering innovation.

The LPSA project wins First Invention Prize in the UK for a small business in the National Toshiba/Design Council Invention Competition.