National Emergency Specifications for the Design of Reinforced Concrete BuildingsU.S. Government Printing Office, 1942 - 38 páginas |
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National Emergency Specifications for the Design of Reinforced Concrete ... United States. War Production Board Visualização integral - 1944 |
Palavras e frases frequentes
adjacent allowable load allowable stress angle assumed bar diameters bearing walls bending moments bond stress bracket clear distance coefficients column capital column or pedestal column strip composite column compressive strength compressive stress computed by formula concrete section critical sections cross-sectional area dead load deformed bars depth direction drop panel eccentrically loaded edge exceed exterior fiber stress fillers flange formula 11 full live load girders given by Formula gross area Interior negative least less longitudinal bars longitudinal reinforcement marginal beams maximum metal core Middle strip moment of inertia moments and shears negative bending one-half percent plain bars Production Board radius of gyration ratio reinforced concrete column resisting Section 102 shearing stresses shearing unit stress six inches slab thickness Span length special anchorage specified spiral reinforcement splice standard hook stirrups structural supports T-beam tensile reinforcement tensile stress vertical War Production Board web reinforcement welded yield point
Passagens conhecidas
Página 10 - ... the effective flange width to be used in the design of symmetrical T-beams shall not exceed one-fourth of the span length of the beam, and its overhanging width on either side of the web shall not exceed 8 times the thickness of the slab nor one-half the clear distance to the next beam.
Página 18 - Longitudinal bars bent to act as web reinforcement shall, in a region of tension, be continuous with the longitudinal reinforcement. The tensile stress in each bar shall be fully developed in both the upper and the lower half of the beam by one of the following methods: 1.
Página 21 - The moment of inertia of slab or column at any cross-section may be assumed to be that of the gross section of the concrete. Variation in the moments of inertia of the slabs and columns along their axes shall be taken into account. 6. Where the load to be supported is definitely known, the structure shall be analyzed for that load. Where the live load is variable but does not exceed three-quarters of the dead load, or the nature of the live load is such that all panels will be loaded simultaneously,...
Página 38 - ... as the area of the lower base of the largest frustum of a pyramid or cone contained wholly within the footing and having for its upper .base the area actually loaded, and having side slopes of one vertical to two horizontal. 1 207 — Pedestals and footings (plain concrete) (a) The allowable compressive unit stress on the gross area of a concentrically loaded pedestal shall not exceed 0.25/'c.
Página 10 - For beams having a flange on one side only, the effective overhanging flange width shall not exceed one-twelfth of the span length of the beam, nor six times the thickness of the slab, nor one-half the clear distance to the next beam.
Página 25 - ... stress due to bending at any section, and the shear about the column, column capital, and drop panel shall not exceed the unit stresses allowed in concrete of the quality used.
Página 17 - ... restrained or cantilever beam, or in any member of a rigid frame shall be adequately anchored by bond, hooks or mechanical anchors in or through the supporting member. Within any such span every reinforcing bar...
Página 24 - The critical sections for bending are located as follows : Sections for negative bending shall be taken along the edges of the panel, on column center lines between capitals and around the perimeters of column capitals. Sections for positive bending shall be taken at mid-span of the strips. (c) Only the reinforcement which crosses a critical section within a strip may be considered effective to resist bending in the strip at that section. Reinforcement which crosses such section at an angle with...
Página 33 - N, combined with bending' in one or both of the planes of symmetry (but with the ratio of eccentricity to depth, e/t, no greater than 1.0 in either plane), the combined fiber stress in compression may be computed on the basis of recognized theory applying to...
Página 29 - Splices, when necessary shall be made in spiral rod or wire by welding or by a lap of 1 % turns. The center to' center spacing of the spirals shall not exceed onesixth of the core diameter. The clear spacing between spirals shall not exceed 3 in. nor be less than 1% in.