Analysis Of Random Seismic Response For High-Pile Wharf With Pile-Soil Interaction

High-pile wharf, which is commonly used in port construction in China, plays animportant role in the port development. Since piled wharf structure is vulnerable toearthquake damage, whether it has enough earthquake resistance is very importantduring its design life expectancy. Considering the pile-soil interaction, this paperanalyzed the seismic response of the high-pile wharf by using random seismic input.The main contents and conclusions as follows:(1) With reference to the code for seismic design of buildings (GB50011-2010)results and previous research results, the related parameters have gotten for the commonrandom seismic input and pile-soil contact simulation methods. Based on the large-scaleuniversal finite element software ABAQUS, a2-D finite element model of high pilewharf is built (FEM).(2) Through analyzing the structural natural vibration of the FEM, we haveobtained the vibration characteristics and required modal order of the high-pile wharfstructure.(3) By using seismic response spectrum, the structure dynamic characteristics anddeformation properties of high-pile wharf structures, which are under three differentdirections earthquake excitation, are analyzed. And the curves of stress and thedisplacement of structure have been received. Then we can found that: the wharf whichunder horizontal seismic excitation presents capsized damage; the wharf which underhorizontal seismic excitation presents sliding failure. So the horizontal drive leadingrole in deformation of soil and structure.(4) Some power spectrum curves of stress and displacement of structure have beenobtained by analyzing the random seismic response of the FEM. Whereafter, dissectingthe power spectrum of the tensile stress, its root mean square value was been gottenwhich was in the75%confidence interval. It can be determined that all peaks of relativedisplacement of power spectral density curves of the terminal node are in low frequencyand high order mode influence on the structural response is limited.(5) Comparing the results of seismic response spectrum with random seismicresponse, it can be known that both the displacement and stress curve change trends areconsistent, and the same order of magnitude. But there are still some differences in thenumerical, and the former is bigger. In this sense, the response spectrum analysis of theseismic analysis of the structure plays an important role. (6) Considering the role of the seismic load, analyzed the influence factors of theresponse of the high-pile wharf structure, include the type of the upper structure and therear filling, some conclusions can be deduced. The one is that the pile-soil dangeroussection is located at the interface and the stress value of the pile top is small, when theupper is frame structure. The other one is that, the stress of the back row pile foundationis larger, instead the stress of pile in the wharf apron is smaller, when there are highfilling at the rear of the wharf. On this basis, some recommendations for the structuraldesign have been put forward.