The origin of formula for ageing coefficient in conversion elestic modulus method is clarified by two simple bridge examples.

Based on some reasonable hypotheses and the stress-strain relationship of concrete obtained by the “adjusting valid modulus depending on age” method, a compact formula to calculate the conversion elastic modulus of the core concrete is presented, which can consider both the influences of creep and the interaction between steel and concrete.

Applying the conversion elastic modulus and conversion coefficient of load, the computer model for calculation of creep secondary internal force for continuous beam bridges is established.

Based on the creep characteristics of concrete filled steel tubular (CFST) arch bridge, a series of stress redistribution formulae were proposed to predict the time-dependent effect on CFST arch rib by introducing the concrete transformed modulus of elasticity.

To analyze mechanics of polyurethane rubber layers in roll bending process,a new concept of converted elastic modulus for polyurethane rubber is put forward to define the elastic modulus of polyurethane rubber changed during forming and the expression of Eeis derived.

Applicability of effective tangent modulus method in evaluation of buckling strength of long-span cable-stayed bridges;