|
Title |
Sensitivity Analysis of Generalized Parameters on Concrete Creep Effects of Composite Section
|
|
Keywords |
합성단면 ; 장기변형 ; 단계별계산법 ; 일반화 매개변수 ; 매개변수 민감도 composite section ; long-term deformation ; step-by-step method ; generalized parameters ; parameter sensitivity |
|
Abstract |
In this paper, the existing formulas of the step-by-step method were generalized for effective estimation of responses of complicated composite sections due to long-term deformation of concrete. The initial transformed section properties of the composite section were derived from material and section properties of concrete section and sections which confine the longterm deformation of concrete. The transformed section properties at each step were derived from the effective modulus of elasticity considered the creep coefficient variation. Improved formulas of the step-by-step method for generalized responses were derived by introducing 5 generalized parameters. The formulas can be more simplified by applying constant increment of creep coefficient at each step. The constant increment of creep coefficient at each step can also reduce computing time and make equal computing error of each step. The generalized responses for axial elastic strain of concrete section were most sensitive to the area rate of concrete section, and the ratio of the second moment of the confining section area was more sensitive than that of the concrete section. Those for elastic curvature of concrete section were most sensitive to the ratio of the second moment of concrete section area.
|