By coll.
In 1984, FIP issued its tips on sensible layout of strengthened and prestressed concrete constructions, in line with the CEB-FIP version Code 1978. This quantity applies those concepts to 8 diverse labored examples of concrete buildings, various from basic beams to silo building, flat slab layout, incremental launching of bridge constructions and different equipment of bridge layout and development. those labored examples, every one with an evidence of the foundations concerned and relentless references to the suitable sections of the 1984 concepts, give you the engineer with a very good advent to trendy structural layout equipment
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Extra resources for FIP handbook on practical design : examples of the design of concrete structures
Example text
Compared with casting in situ and with precast construction, the advantages of the incremental launching method become dominant when the costs of the 41 42 FIP handbook on practical design falsework are significant. This may be the case when the bridge is situated at a high level or over soft ground where heavy lifting machines have difficulties of access. Safety During launching, every point of the bridge has to pass over sliding bearings. Consequently every cross-section is affected by bending moments of reverse direction and therefore only uniform prestress is possible.
4. Total losses (Includes reduced relaxation: 5% instead of 6%) Fig. 5. 3 Fig. 5 Fig. 5. ) Prestressing forces are shown in Table B8, and moments in Table B9. B5. 1. 2 Load distribution in transverse direction assumed to be constant (ductility of slab to be checked). Moment distribution in longitudinal direction: see Fig. B7. Fig. 2 Mresd = M(O'8/;k/l-5; / y k / M 5 ; / O . 3 Fig. 4 Fig. 6 Fig. 4 Mechanical degree of prestressing: k. 2. 2) 2 lanes: ch =9-8 x 7-5 2 lanes: q2 = 0 7 5 x 9-8 x 7-5 2 lanes: q3 = 0-50 x 9-8 x 7 5 Total for six beams: q For one beam: q = = = = = 73-5 kN/m 55-1 kN/m 36-8 kN/m 1654 kN/m 27-6 kN/m Ultimate limit state gives = 5343 kNm Concentrated load: 400 kN For one beam: Q = 67 kN Ultimate limit state gives 3215 = 800 kN m M° , .
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.