In architecture, a basket arch is an arch that is composed by design of three or five connecting circular segments.
This decorative element was used in the late Gothic and Renaissance periods until the 17th century.
Motivation phase
The basket arch.
One can easily describe a basket arch as a printed round arch.
At least 3 porring points are needed to plot this arch construction.
Do you also observe this in the image below?
Photo below is copied from the next page: Wikimedia Commons.
Information phase
Construction of a basket arch.
* Method 1, span given:
Divide AB into four equal parts.
With D, C and E as centers and CD as radius, draw three circles.
Draw a line through points D and G, another trough points E and H
Using D and E as centers, construct the arcs AI and BJ
Using F as the center and FI as the radius, construct the arc JI.
Porring points: D, E and F.
Photo below is copied from the next page: Wikimedia Commons.
Information phase
Construction, basket arch2
* Method 2, span and height given:
Given: Birth line AB
The height bC
Small radius aC, for this you best take 1/5 of AB
Draw on AB a perpendicular bisector.
Draw on this perpendicular bisector the height bC.
Plot the length of the radius a from ABC.
Connect F with D and E.
Draw the perpendicular bisector on DF an FE, this gives point G.
Draw the line through points G and D, another through points G and E.
With D and E as centers and a as radius, ( a= AD= EB), construct the arcs AH and IB.
With G as center and GH as radius, construct the arc HC joining the arcs AH and IB.
Porring point: D, E and G.
Photo below is copied from the next page: Wikimedia Commons.
Consolidation phase
Excercise basket arch
Make a brief analysis of this video. A basket arch can also be made in concrete.
Permission tu use the video below granted by You tube.
