Identifier: architectenginee1030sanf (find matches)
Title: Architect and engineer
Year: 1905 (1900s)
Authors:
Subjects: Architecture Architecture Architecture Building
Publisher: San Francisco : Architect and Engineer, Inc
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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storieshigh, is of a rein-forced concreteflat slab design. While for theabove mentionedunits generallycustomary typesof framing wereused, the gym-nasium offereda wider o p - 105 PARK PRESIDIO HIGH SCHtWLihkian, C. E. 106 AflCHlTLCT AND ENGINEER, September, 1930 portunity of a close cooperation betweenthe architect and engineer. The gymnasiumis a two story reinforced concrete building69 wide and 145 long. The second flooris of the flat slab type of construction. The roof above the second, or gymnas-ium floor, is framed by means of threehinged reinforced concrete arches. Thearches have a span of 690 and occur every steel trusses were assumed to be fireproof. Details of the concrete arches are shownon the various photographs and photostats.The horizontal and vertical pipes shownunder the arches in the picture of the inter-ior of the gymnasium have no structuralfunction; they serve as apparatus supportsonly. In order to insure as near as possiblethe action of a three hinged arch, a joint
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DET.\IL, REINFORCING AT CENTER JOINT, PARK PRESIDIO GYMNASIUML. H. Nishkian, Structural Engineer 180. They support reinforced concretebeams on which a 3 planking and tile roofrests. The balcony is also supported bymeans of reinforced concrete cantileverbeams from these arches. In selecting reinforced concrete as amain support for the roof, the principalargument in its favor was a pleasing inter-ior appearance and additional clearance. A preliminary study of comparativecosts between a steel frame and a concreteframe showed a difference of 1/10 of onecent per square foot in favor of steel. Thisdiflference, however, changed in favor ofreinforced concrete arches if the structural was left in the exterior walls along the bot-tom hinge until all the concrete walls werepoured and the roof tiles set. This jointwas then filled with cement mortar. The architects of the Presidio JuniorHigh School were the late W. H. Crim,Jr., E. J. Resing and J. F. MGuinness. Thewriter was in charge, under the d

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