Numerical Simulation And Experiment Research On Seismic Behavior Of Gravity Platform In Shallow Sea

At present, large domestic oil field is close to be hollowed. However, there is a large number of marginal oil field urgently needs to be exploited in coastal area, so it is imperative under the situation to research on the platform which is new-style, multi-functional and mobile. In order to adapt the needs of the exploitation of marginal oil field, new platform that is single-tank gravity offshore platform with apron-based is designed. The impact of earthquake loading for platform in the seismic active area is considered.This paper studies the platform with apron-based in the following areas of work:1. This paper uses finite element software to simulate the platform structure. The author considers additional water quality, hydrodynamic damping and the soil-structure interaction, and chooses several resized earthquake seismic waves, uses time history to analyse the platform. This thesis studies the seismic response of the platform in different direction and different eccentric load, and researches on the impact of seismic capability in different scouring condition.2. Using large-scale shaking table tests on seismic behavior. Through large-scale shaking table test, the author gets the time history curves of acceleration, displacement and stress-strain in earthquake, and peak stress of the end columns, peak displacement of the peak columns by similar conversion. The results are compared with theoretical calculations.3. Integrate with the result of numerical simulation and shaking table test, this paper figures horizontal displacement of pillars exceeds the standard requirement in strong shock. The displacement of bidirectional shaking waves is increscent than single shaking wave'. While the eccentricity load is coming out on deck, the influence of the load is little for peak value displacement. However, the greater the load is, the larger the relative displacement of pillars is. When the fundus is hollowed by seawater and the ratio of hollowing is less than ten percent, the platform is well. But when the ratio is more than ten percent, the platform needs to be taken the relevant protective measures. Therefore, the author puts forward it is necessary to strengthen platform deck, the pillars. For example, Increasing the pillars'section and horizontal supports in middle and top pillars, strengthening holistic capability of the pillars, adding horizontal steel beam and vertical supports under the deck. It also established that the pillars will not be destroyed in the earthquake.