Abstract
The usability of precast spun concrete members of annular cross-sections as pier shafts for road bridges and footbridges is discussed. The probability distribution of traffic loads is considered, and their coefficient of variation is specified. First- and second-order load effects for shafts of braced and bracing piers are analyzed. The modeling of resisting compressive forces and bending moments of eccentrically loaded spun concrete shafts is considered. The features of mechanical properties of compressed spun concrete specimens reinforced by cold worked high-strength steel bars are presented. A simplified but fairly exact analysis of pier shafts under persistent situations by limit state and probabilitybased approaches is provided. A design of tubular shafts of braced piers using semi-probabilistic and probabilistic reliability verifications is illustrated by a numerical example.
Highlights
Precast spun concrete shafts of annular cross-sections reinforced by steel bars uniformly distributed throughout their parameters and having high microcracking and low creep parameters satisfy economical, constructive and aesthetical requirements for bridges
A design of tubular shafts of braced piers using semi-probabilistic and probabilistic reliability verifications is illustrated by a numerical example
The braced and bracing piers with tubular shafts may be treated as being isolated members fixed at their foundation which must be fixed in the ground
Summary
Precast spun (centrifugally cast) concrete shafts of annular cross-sections reinforced by steel bars uniformly distributed throughout their parameters and having high microcracking and low creep parameters satisfy economical, constructive and aesthetical requirements for bridges. The economically and structurally effective spun concrete shafts allow engineers to design and erect prefabricated piers subjected to vertical and horizontal forces. They may be successfully used in construction practice of piers of short-span road bridges and footbridges. The analysis of bearing capacity and structural safety of eccentrically loaded spun concrete piers under compression with a bending moment or bending with a compressive force has some characteristic features. Their design in a simple and perceptible manner is desirable by design engineers.
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