The relationship between stress and strain of concrete in prestressed concrete bridge s is written as algebraic form within load duration and the equilibrium equations of internal force and compatibility conditions are introduced.

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It was found that the puncture strength, tensile strength and modulus as well as the inverse of relaxation coefficient of starch/dHG films pronouncedly increased with increasing dHG, accompanied with a decreasing tendency in puncture deformation, extensional creep compliance, retardation time and tensile strain at break.

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In the absence of additional cross-linker, increasing molding temperature from 25 to 125℃significantly enhances crosslinking density of the three-dimensional proteinnetwork through disulphide bonding, leading to increase of tensile strength, Young\'smodulus and relaxation time.

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The relaxation modulus, the relaxation time spectra and the structure parameters C 1 and C 2 in the WLF equation were derived from the dynamic mechanical temperature spectra of the cationic dyeable PET fibres after heat setting.

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