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Download FIP handbook on practical design : examples of the design of by coll. PDF

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By coll.

In 1984, FIP issued its tips on useful layout of bolstered and prestressed concrete constructions, in keeping with the CEB-FIP version Code 1978. This quantity applies those ideas to 8 assorted labored examples of concrete constructions, various from basic beams to silo development, flat slab layout, incremental launching of bridge constructions and different tools of bridge layout and building. those labored examples, every one with a proof of the foundations concerned and incessant references to the proper sections of the 1984 thoughts, give you the engineer with a very good advent to trendy structural layout tools

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C7), where 23 m is the distance between points of zero moment. The parts of the deck slab which are inefficient in bending are added to the areas Ac and An. Section data are shown in Table Cl. Sc = 3-211 m 3 Fig. C7. 4 49 50 FIP handbook on practical design Table C1. Section data Plain concrete section Account taken of longitudinal bars and duct holes 7076 I 060 I-720 6-969 6-570 4-053 0-540 7-352 1060 1-720 7-349 6-931 4-273 — A: m 2 h-ye: yc: m m /:m4 W sup : m 3 Win(: m3 P I p= - yc)yc p > 0-5 (OK, good section efficiency according to Guyon 2 ) For torsion (I ft) ds 2 x 0-55 x 0-20 x (2-78 - 0-20) 2 x ( 5 5 0 - 0-55) : = 11-080 m 4 ~ 5-5 x 0-55 + 2-78 x 0-20 - 0-55 2 - 0-20 2 Prestressing force (straight tendons only) Po = (10 + 6) x 1-456 = 23 296 M N Eccentricity of prestressing force e = C4.

In deck slab and in bottom slab). 4. 1 3 Launching period: 0-5 year = 180 days — = 0-55 The development of shrinkage is also estimated from Fig. 5 because no other information on that concrete deformation is given in the recommendations. In this example only the launching period is dealt with. A straight tendon has an anchorage in every second joint; only half of them are prestressed at the same time. Medium values ( > 7 days) are thus justihed. The curved tendons are prestressed after launching (>180 days) and mature values are used for them.

The dimensions of the cross-section can depend on the number of straight tendons etc. 4. Serviceability limit state As mentioned previously, the girder has to be relatively deep because of the bending moments during launching. Particular attention must be paid to the efficiency of the cross-section. It can be estimated2 from the value of p The value of p should be as large as is practically possible. The use of a box cross-section with relatively thin webs is very appropriate to fulfil this condition.

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