Modern Masonry Natural Stone and Clay Products (1956) / Chapter Skim
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II. Technology of Building With Masonry
II. Technology of Building With Masonry
Pages 29-50
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From page 29... ...
Having started on an aesthetic basis, which ~ must say ~ commend, we must nevertheless move quickly into things equally basic but in another dimension.
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From page 31... ...
Mr. Dickey is a member of the American Society of Civil Engineers, the American Standards Association Masonry Committee the Structural Engineers Association of CaZifornia' the Pacific Coast BuiZ6ing Officials Conference and the American Ordinance Association.
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From page 32... ...
WHAT [S RBM AND RGBM? The terms RBM~an(1 RGBM are abbreviations of "Reinforced Brick Masonry" and "Reinforced Grouted Brick Masonry.', These should be definecl of course, since they are the subject of this paper.
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From page 33... ...
The installation was not well regarclecT by the masons, their felt tint "they had built the Pyran~icis without steel and steed was not necessary." However, while reinforcen~ent has been used for a long tinge ancI sometimes rather haphazarcIly, to strengthen n~asonr,v, reinforced brick masonry in the modern sense is a relatively new construction requiring new design procedures and new construction n~ethocis. In the past 20 years especiaTly these have been developed from experimental investigations ancT observations of construction of hundreds of buildings uncler orclinar,v vertical Toacis, anc!
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From page 34... ...
Many types of masonry were attempted special shapes were (leveloped The Grout Lock Brick and the Port Costa Key Brick shown in the sketches are two. The ~nechanical key to the brick is a desirable feature, elin~inating one of the hazards of poor world manship, namely poor bond.
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From page 35... ...
dS"WALL CORNER CONSTRUCTION DETAI L ~ 124"s 134~ PI ER In: ~ if ~e,~forceo' fork AFROS L~ Is. ~ IS ~ ~ ~ ~7fl /f~c CO LU M N ~ BE AM 8 E A M BR [C K C O N STRU CTION PORT COSTA KEY BRICK GROUTED MASONRY Sketch at upper ri,,ht shows typical wall sections constructed with special brick known as `-Groutlock'' brick.
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From page 36... ...
Masonry Wythes bonded together with grout collar joint between. Composite Construction Might be similar to reinforced grouted masonry, with hollow units in one wythe and solid in another.
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From page 37... ...
The laboratory was formed by intersecting walIs of reinforced hollow glazed tile and by having the interior wythes of the exterior wall co~nposec] of glazer!
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From page 38... ...
REINFORCED GROUTED BRICK & TILE CONSTRUCTION Typical Vertical Wall Section Vertical Section at Pilaster An example of the effective use of SCR is illustrated in a school building plan and science developed by the Structural Clay Products Research Foundation and entitIec] "SCR school clesign concept." This concept was developed for areas not subject to the hazards of earthquake and is quite econon~ical.
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From page 39... ...
In some instances the supporting structure can be incorporated in flee masonry with no aclditional reinforcing. The table below shows tile comparison of temperature steel required in masonry walls of various thicknesses as contoured to that requirecT for reinforced concrete walls.
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From page 40... ...
This is recognized to a certain degree in the Uniform Building Cocle where the H/D ratio permitted for unreinforced bearing walls is 20, but for reinforced walls the H/D may safeIv be increased to 25. 40 The additional strength is also recognized in 'non-bearing walls' in which the limitation for H/D is Z0 for unreinforced walls but is 30 for reinforced walls.
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From page 41... ...
As mentioned before, this brick building is some 800' long and it is to be noted that there are no visible cracks in the front, rear, or inter ~ncdiate walls, aTtl~ougl~ there are cracks in the concrete base portion at about 9 foot centers. DESIGN The structural design theory for REM is identical to the design theory for reinforced concrete, except teat certain different nu~nerical values are involvecI.
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From page 42... ...
Another item of growing popular concern is consideration of blast resistant design. The primary consideration in masonry structures is ease of placement of reinforcing to resist the very high loacling assumptions, and freeclo~n in providing for tying all parts into an integral structure, one that will 'hang together." An RBM wall designecl for blast resistance is sl~own in the figure below.
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From page 43... ...
for sound public eciucation in this matter. The best education of course is physical example, and we need n~ore Acorn derring-clot Another example of the eFective use of rein PALO ALTO CITY HALL LOBBY forced brick is the curved wall at the encl of the Palo Alto City Hall lobby.
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From page 44... ...
Dilution gain with height increase and concentration increase with top diameter increase. Given the solution to the above, frequently manacle more interesting ancT complex by earthquake considerations, the engineer may find an economical solution in REM, especially in the lower stacks somewhere under 200'.
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From page 45... ...
It has an adaptability and freedom of expression which could be snore fully realized. Design theory is iclenticalL to reinforced concrete design theory.
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From page 46... ...
Good atomic blast resistance. Good wcatl~er resistance.
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From page 47... ...
It involves the mass production of the vertical components of a building ~ exterior ;valIs, corridor walls and partitions) ancT link Walker 0.
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From page 48... ...
The metal ties were ideal collecting points for fallen mortar ancT wouicI, if strict supervision were relaxecI, produce "bridges" or conduits for moisture to follow into the walls. Weep holes at the base of the wall were proviclecI and they too hac!
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From page 49... ...
The current efforts lean toward thinner and thinner veneers, less emphasis on fully bonded walls except where more permanent or monumental structures are involved, and attempts to combine thin stones with metal Frances and panels. Masonry construction has in the past solved exterior wall problems in a superior fashion because of its great strength, (lurability, resistance to weather and fire, dimensional stability, thermal transmission ant]
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