„zemburger Bergwerks- und Saarbrücker Eisenhütten-Actien-Gesellschaft
Burbacher Hütte bei Saarbrücken,

Explanations.

The bearing capacity is calculated on an expenditure
of force (maximum deflection S.) of 100) kilogrammes
per square centimetre and on the supposition that both
ends of the beam are free and the load equally divided
over the whole length,

According to the standard conditions of quality constructional
 steel must possess a tenacity of 37/44 kilogrammes
 per square millimetre, thus an average tenacity
of about 40,5 kilos. per square m/m or 4C50 kilos. per
square c/m. Therefore the said expenditure of force of
1000 kilos. per square c/m corresponds with a fourfold
security against fracture. Steel of higher tenacity is
supplied to suit the requirements of the British, American
and other export markets.
The weight of the joist itself is disregarded in the
calculation of the bearing capacity.
The loads given in the tables as permissible vary
according to the conditions under which the beams are
piaced as follows:

Wilh ends left free and foad in centre of beam baaring capscilw is 3a.
Both ends firmiy fixed, load eren!y dis‘’ributed, bearing capacily 1'2,
Ends firmly fixed, load in oantre, bearing capacity equal.
Dre end firmly fixed, load evenly distributed, bearing capacily 2,
One end firmly fixed, other end loaded, bearicg capacity 1/3,
Dne end firmly fixed, other end free, load equaliy distrituted, bearing capacity equal.
Same condition: as last but load in iha centre, bearing canacily 2/2.

The bearing capacity cf the columns is calculated
accordLr to ti formular for resistance to crushing

P

ross section area,
1e minimum moment of inertia,
“ree length of the columm in c/m,
The adınissible expenditute of force based
en 1000 kilos. per square c/m for tension
and pressure. The coefficient a is 0.0001.