Title: Structural Design of High-Performance Concrete Bridges
Author(s): M. K. Tadros, X. Huo, Z. (John) Ma, and M. Baishya
Publication: Symposium Paper
Appears on pages(s): 9-36
Keywords: bridges; compressive strength; creep; deflection; high-performance concrete; modulus of elasticity; structural design
Based on four strength parameters testing of three high-performance concrete (HPC) design mixes and parametric studies, the following conclusions have been made. Creep and shrinkage strains of HPC are lower than those in conventional concrete. Amount and type of coarse aggregates affect the value of modulus of elasticity. The modulus of elasticity of HPC should be determined through experiments with local materials. Beam sections that have large bottom flange are efficient for HPC application. The most significant property of HPC prestressed beam is compressive strength at release. Allowable compression at release has the most impact on span capacity, while allowable tension at service has minor impact. Prestress loss can be reasonably predicted by either the proposed method or AASHTO LRFD Lump Sum method. PCI deflection multipliers at final time are not accurate. The proposed multipliers which are the functions of creep coefficient can be used for conventional and HPC members.