Unified procedure for the nonlinear finite-element analysis of concrete structures based on a new model for tension stiffening

Thesis/Dissertation · Thu Dec 31 23:00:00 EST 1987

OSTI ID:7032046

Ojdrovic, N P

A unified procedure for the analysis of reinforced, partially prestressed, and prestressed concrete frames was formulated. Reinforced concrete is treated as a special case of prestressed concrete with zero prestressing force. A large variety of structures can be analyzed, from simple reinforced concrete beams, to reinforced or prestressed concrete frames, to structures whose various parts are made of different materials. Pretensioning and posttensioning with bonded and unbonded tendons are considered. The finite-element method based on the displacement formulation is used to solve the system of nonlinear equilibrium equations. Geometric and material nonlinearities are considered. Large displacements are accounted for using an updated Lagrangian formulation. The nonlinear behavior of concrete in compression is modeled using the Hognestad's parabola. Reinforcing steel is modeled as an elastic-perfectly plastic materials. To account for tension stiffening, a new model for the stress-strain relationship for concrete in tension is proposed. Results obtained in the numerical analyses show good agreement with experiments, although the proposed stress-strain model is based on only one concrete parameter, compressive strength.

• Research Organization: Iowa Univ., Iowa City, IA (USA)
• OSTI ID: 7032046
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
BUILDING MATERIALS
COMPRESSION STRENGTH
COMPUTER CODES
CONCRETES
FINITE ELEMENT METHOD
IRON ALLOYS
IRON BASE ALLOYS
M CODES
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NONLINEAR PROBLEMS
NUMERICAL SOLUTION
PRESTRESSED CONCRETE
REINFORCED CONCRETE
REINFORCED MATERIALS
STEELS
STRESS ANALYSIS