新型高桩码头的减震措施

Measures to Reduce Seismic Hazard to New Type Piled Jetties

现役高桩码头水平面桩头部分由于恶劣环境因素导致的腐蚀等破坏令人担忧。通过对2003年日本宫城县冲地震和1995年阪神大地震中港湾高桩码头的水上和水下震害调查,分析了两次地震中出现的高桩码头震害的原因,并根据计算分析结果探讨了其破坏机制。通过对现有高桩码头结构导入减震橡胶支座后的地震反应分析发现,减震支座的导入将有利于提高高桩码头的抗震能力,使桩上部固定端处的最大弯矩减小到未减震前的1/3。

The section of piles from above the water of the piled jetties in service is seriously corroded or damaged due to atrocious environmental factors. Based on the investigation of the underwater and above-water earthquake damage to the piled jetties in the Kobe violent earthquakes in 1995 and the Miyagiken-oki violent earthquakes in 2003, Japan, the causes of the earthquake damage to the high pile jetties in both earthquakes were analyzed and the mechanism of damage was also discussed with the results of the analysis and calculations. It is discovered, from the analysis of the seismic reaction of the piled jetties with rubber shock absorption seats, that the use of shock absorption seats will help improve the seismic resistance of piled jetties and the use of shock absorption seats will may reduce the maximum bending moment of the fixed end on a pile head to one third of that before the method for reduction of seismic hazards is adooted.