Author(s): Jiahua Shu
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Keywords: No Keywords
Abstract: This paper includes two parts. The first part deals with a new formula proposed by the author for the calculation of dynamic ice force exerted by a single drifting floe on bridge-pier, abutment or other hydraulic structures. The second part is a description of field tests and the derivation of a preliminary formula for calculating the impact ice force on these structures. The proposed dynamic ice force formula is a multi-function formula which can be used for calculating not only the dynamic ice force caused by normal collision but also that by oblique collision of a single drifting floe, whether with the front-end surface or with the lateral surface of the structure. This formula epitomized some foreign formulas compiled in Design Specifications for Railroad and Highway Bridges and Culverts for calculating the dynamic ice force due to oblique collision of a drifting floe and other formulas given in foreign Handbook of Hydrotechnics for calculating the dynamic ice force caused by normal or oblique collision. Beside it has some features different from what those foreign formulas have. Such as, it has taken into account the effect of added mass on the floe due to adherent water body; the various aspect ratios or length-to-width ratios of floe of different sizes; the adoption of the value of J according to the bending direction of cross-sections of the floe under eccentric compression. It is more satisfactory on the theoretical plane and has a wider scope of application. The impact ice force formula is presented in its preliminary form which is comprised in a suggestion based on field test data for establishing a formula to calculate the ice force due to normal impact of a drifting floe perpendicular to its acting surface on a bridge-pier, abutment or other hydraulic structures. This paper has also introduced a working process for establishing ice impact formula and briefly described a practical method for field, tests of ice forces which is also very convenient for us to acquire more abundant actual test data.
Year: 1986