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Elementary Mathematics and Architecture
     MAA Minicourse, Boston, January 4-
     8, 2012

                 Alexander Hahn
              University of Notre Dame


Part IIb: The Sydney Opera House (continued)
JMM Mini4- Sydney Opera House Part 2
JMM Mini4- Sydney Opera House Part 2
B
            C
B

                                             C
    A
                                         A
    O                    O




                    A1                       A2




        B                B           C
                C

                             A
            A


                         O
    O




                    A3                       A4
JMM Mini4- Sydney Opera House Part 2
0   100   200   300 feet
C
      C



B                 B



          A
(a)           O             A


                  (b)
rib number 12
                 ridge beam segment
              top cut-off segment
       standard rib segment

    standard rib segment

standard rib segment




                                246
                                      foo
                                            t ra
                                                   d iu
                                                       s
      standard rib segment

     standard rib segment

   pedestal
                 tie beam




     column                                  (a)                                              (b)


                                             standard rib segment number 7




                                                                             (c)
JMM Mini4- Sydney Opera House Part 2
JMM Mini4- Sydney Opera House Part 2
Curvature and Combinatorics
of Surfaces
JMM Mini4- Sydney Opera House Part 2
JMM Mini4- Sydney Opera House Part 2
JMM Mini4- Sydney Opera House Part 2
M




        x
    S
Gauss map

 unit normals
U(q)                                U(q)
                 U(p)
                                                 U(p)
                                      A
     q
         p
 S


on the surface                       the unit sphere
M




                   x
                       S




The Gaussian curvature of the surface at x is
                         Area A
           K(x) = l i m
                 S     0 Area S

(Consider a flat piece of surface on M)
JMM Mini4- Sydney Opera House Part 2
JMM Mini4- Sydney Opera House Part 2
JMM Mini4- Sydney Opera House Part 2
JMM Mini4- Sydney Opera House Part 2
h
    r



        R
JMM Mini4- Sydney Opera House Part 2
c(T) = V - E + F = 1
                                   C
                               g
                           T


                       a
                  A
                                   b
                                       B
JMM Mini4- Sydney Opera House Part 2
a
                T

            b             g

                               M


A geodesic triangle T on M has area
R 2 (a + b + g - p)

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JMM Mini4- Sydney Opera House Part 2

  • 1. Elementary Mathematics and Architecture MAA Minicourse, Boston, January 4- 8, 2012 Alexander Hahn University of Notre Dame Part IIb: The Sydney Opera House (continued)
  • 4. B C B C A A O O A1 A2 B B C C A A O O A3 A4
  • 6. 0 100 200 300 feet
  • 7. C C B B A (a) O A (b)
  • 8. rib number 12 ridge beam segment top cut-off segment standard rib segment standard rib segment standard rib segment 246 foo t ra d iu s standard rib segment standard rib segment pedestal tie beam column (a) (b) standard rib segment number 7 (c)
  • 15. M x S
  • 16. Gauss map unit normals U(q) U(q) U(p) U(p) A q p S on the surface the unit sphere
  • 17. M x S The Gaussian curvature of the surface at x is Area A K(x) = l i m S 0 Area S (Consider a flat piece of surface on M)
  • 22. h r R
  • 24. c(T) = V - E + F = 1 C g T a A b B
  • 26. a T b g M A geodesic triangle T on M has area R 2 (a + b + g - p)