The Pantheon, Rome

Assembled from 53 blocks · 3 evidence · 60 related

1. Story
2. A domed rotunda in the Campus Martius, rebuilt in its present form under Hadrian and traditionally dated 126 CE, though brick stamps in the fabric point to construction chiefly between about 113 and 125. It still carries the largest unreinforced concrete dome in the world. The interior is a sphere resolved into a cylinder: the dome's internal span and the height from floor to oculus are both about 43.3 m, so a sphere of that diameter would touch the floor exactly. Almost every feature is a response to the material's lack of tensile strength - a drum wall around 6 m thick honeycombed with relieving niches and arches, aggregate graded from heavy travertine and tuff at the base to light pumice and scoria near the crown, five rings of coffers cutting dead weight out of the shell without weakening the compression paths, stepped rings of masonry buttressing the haunches from outside, and an open oculus about 8.8 m across at the crown where a keystone would carry no load anyway. Radial cracks in the shell were recorded by later surveys, and the building stands with them.
3. Knowledge
4. Rome
5. The dome
6. Roman concrete (opus caementicium)
7. The Pantheon, Rome
8. Connections
9. Treasury of Atreus, Mycenae
10. Roman concrete (opus caementicium)
11. Rome
12. The dome
13. Roman concrete (opus caementicium)
14. Hagia Sophia, Constantinople / Istanbul
15. The Pantheon dome spans about 43 m in unreinforced concrete
16. Colosseum (Flavian Amphitheatre), Rome
17. Reinforced concrete
18. The Pantheon, Rome
19. The Pantheon, Rome
20. Roman builders adopt pozzolanic concrete
21. The Colosseum opens: arch and concrete at civic scale
22. The Pantheon dome spans about 43 m in unreinforced concrete
23. Lime clasts reinterpreted as hot mixing and self-healing
24. Colosseum (Flavian Amphitheatre), Rome
25. The Roman Legion
26. Roman Law
27. The Mediterranean Sea (Mare Nostrum)
28. Ostia Antica
29. Via Appia
30. Traditional foundation of the Roman Republic
31. Construction of the Via Appia begins
32. The Punic Wars
33. Caesar crosses the Rubicon
34. Assassination of Julius Caesar
35. The Augustan settlement: Octavian becomes Augustus
36. Inauguration of the Flavian Amphitheatre
37. Dedication of Constantinople
38. Administrative division of the empire on the death of Theodosius I
39. Alaric's Goths sack Rome
40. Odoacer deposes Romulus Augustulus - the contested 'fall' of the Western Roman Empire
41. The Pantheon, Rome
42. The Pantheon dome spans about 43 m in unreinforced concrete
43. The voussoir arch
44. The pendentive
45. The Pantheon, Rome
46. The Pantheon dome spans about 43 m in unreinforced concrete
47. Hagia Sophia is dedicated
48. The first dome of Hagia Sophia collapses
49. The steeper dome is dedicated
50. Evidence
51. Standard study of Roman concrete vaulting, its materials, aggregate selection and construction sequence, including the graded-aggregate practice used in large domes. Supports the MATERIAL_ROMAN_CONCRETE and SITE_PANTHEON records. V55 verification basis: real and standard, but not consulted in this session; no research domain was reachable.
52. Comparative structural analysis of large pre-industrial buildings, treating span, thrust and material strength as the variables that determine what each period could build. Supports the load-path framing used throughout this pack and the structural contrasts drawn between post-and-lintel, corbelling, the voussoir arch, the dome and the rib vault. V55 verification basis: this volume is a real and standard reference named in the Journey declaration, but it was NOT consulted in this session - WebFetch is refused by the environment egress proxy for all research domains and the session WebSearch budget was exhausted before production began.
53. The Pantheon stands within the inscribed Historic Centre of Rome World Heritage property. V55 verification basis: whc.unesco.org is blocked by the environment egress proxy; the property name, inscription year and extension year are stated from established record and must be confirmed.