Abstract
The high rigidity steel pipe sheet pile(490N/mm2 grade) has been used in deep water quay walls. When it comes to high rigidity, the maximum bending moment of steel pipe sheet pile increases. If the stress of steel pipe sheet pile is greater than the design value, it is necessary to increase the cross section(diameter or thickness). Therefore, the rigidity increases further, the maximum bending moment also increases. On the other hand, if increasing the strength of the steel pipe sheet pile, it is possible to design it without increasing the cross section. Therefore, a design method of high-strength steel pipe sheet pile(570N/mm2 grade) corresponding to the current standard has been proposed. It is feared that stiffness reduction due to the application of high-strength steel pipe sheet pile would adversely affect the seismic performance. As results of dynamic analysis, the deformation of top of the high strength steel pipe sheet pile quay wall(570N/mm2 grade) in earthquake is equivalent to the conventional steel pipe sheet pile (490N/mm2 grade). The reason is because it is determined by the earthquake resistance of anchorage work.
