Experimental Study Of The Wave Force On The Geometrically Asymmetrical Pile-supported Structures

Pile-supported foundations are common in the coastal and offshore environment,such as bridge piers,the piled breakwaters,offshore platforms and the offshore wind turbine foundations.Regarding offshore constructions,wave load influences the stability and usability of the structures remarkably.Consequently,predictions of wave load are of great importance in design of offshore constructions.In the present study,a series of physical experiments were conducted on asymmetrical pile groups under both regular and irregular wave conditions.Six spacings between adjacent piles and four incident wave angles were considered.The in-line force and transverse force were analyzed in both time domain and frequency domain.By considering both present data and published data,an existing empirical formula for symmetrical pile groups was modified and expanded to asymmetrical pile groups.Based on the modified formula,the pile group effect coefficient could be obtained.Finally,an empirical formula was proposed for the normalized zeroth moments of in-line wave force spectrum of pile groups.