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Challenge: Build an arch bridge model using cardboard and popsicle sticks
Challenge: Build an arch bridge model using cardboard and popsicle sticks
David Macaulay: Roman Arches Video (1:50)
https://mass.pbslearningmedia.org/resource/phy03.sci.phys.mfw.bbarch/arch-bridge/
Arches and Chains
http://www.civil.uwaterloo.ca/brodland/MechanicsModels/arches.html
A stone arch works solely in compression.
Mortar, when used primarily serves to transmit compressive forces, rather than to "stick" the stones together.
Above Right: Dry Stone arch by master mason Dan Snow
Below: The Pons Fabricius or Ponte dei Quattro Capi, is the oldest Roman bridge in Rome, Italy, still existing in its original state. Built in 62 BC, it spans half of the Tiber River, from the Campus Martius on the east side to Tiber Island in the middle. Wikipedia
Using base board, build arch with concrete patio blocks, and invite students to sit and stand on it.
What is holding up the arch? What happens to the downward force of the blocks?
Using foam blocks, build a Roman arch and Catenary arch
A catenary arch( such as the St. Louis Gateway) is self-supporting, unlike circular Roman Arches.
Activity: Build Model of a Through-Arch Bridge:
Activity: Build Model of a Through-Arch Bridge:
Below-Dome of the Pantheon, Rome.(110AD)
A dome is an arch in 3 dimensions, and, like an arch is purely compressive.
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