ENGINEERING STRUCTURES - PRESTRESSED CONCRETE, DIFFERED EFFECTS - THEORETICAL STUDY OF THE REDISTRIBUTION OF STATICALLY INDETERMINATE EFFECTS OF LINEAR CREEP IN PRESTRESSED CONCRETE BRIDGES

LES OUVRAGES D'ART-BETON PRECONTRAINT, EFFETS DIFFERES- ETUDE THEORIQUE DE LA REDISTRIBUTION DES EFFETS HYPERSTATIQUES DES PONTS EN BETON PRECONTRAINT PAR FLUAGE LINEAIRE

Doubts as regards the allowances to be made for differed phenomena in statically indeterminate prestressed concrete bridges, the static pattern of which changes during construction, are sometimes the cause of serious disorders. A number of structures were monitored to study the redistribution of internal stresses due to differed phenomena. The first simple calculations made did not enable the measurements to be interpreted satisfactorily. A mathematical model was derived in which the redistribution of internal stresses and prestressing losses were interrelated. The influence of the selection of creep law can also be studied with this mathematical model. The model leads to the step-by-step numerical solution of an integral-differential system describing simultaneously concrete creep and relaxation of the prestressing cables. The compatibility of displacement rate determines the statically indeterminate moments of redistribution taking into account the whole history previous to the time taken into account. An example of application to a two-span statically indeterminate beam is given. (TRRL)

• Corporate Authors:

  Laboratoire Central des Ponts et Chausees (LCPC)

  Boulevard Lefebvre 58
  Paris Cedex 15,   France  F-75732
• Authors:
  • Bruneau, J
  • LAU, M Y
  • Thenoz, M
• Publication Date: 1978-7-8

Language

• French

Media Info

• Features: Figures; Tables;
• Pagination: p. 138-142
• Serial:
  • Bulletin de Liaison des Lab des Ponts et Chaussees
  • Issue Number: 96
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Bridges; Concrete; Concrete bridges; Creep; Linear systems; Loss and damage; Losses; Mathematical models; Physical distribution; Prestressed concrete; Prestressing; Statically indeterminate frames; Stresses; Structures
• Old TRIS Terms: Concrete creep
• ITRD Terms: 3455: Bridge; 4732: Creep (mater); 9016: Distribution (gen); 6484: Linear system; 9040: Loss; 6473: Mathematical model; 4796: Prestressed concrete; 4777: Prestressing; 5516: Statically indeterminate; 5575: Stress (in material)
• Subject Areas: Bridges and other structures; Design; Freight Transportation; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00315252
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Feb 6 1981 12:00AM