碰撞条件下高弹模CFRP加固自升式平台桩腿性能分析  

Analysis of the bearing capacity of the leg with high modulus CFRP strengthened for the jack-up offshore platform under collision

作　　者：李红明[1] 韩纯强[2] 王珂[2] 

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212003 [2]江苏科技大学船舶与海洋工程学院,江苏镇江212003

出　　处：《海洋工程》2012年第3期105-111,共7页The Ocean Engineering

基　　金：国家自然科学基金资助项目(50879030)

摘　　要：由于腐蚀、海生物附着等因素导致老龄化海洋平台在与船舶碰撞的事故作用下,桩腿变形加大,降低了承载性能。为减少碰撞对桩腿的损伤,提高其耐撞性能,提出了利用吸收能力较强的高弹模CFRP材料加固平台桩腿的方法。以某自升式海洋平台桩腿为例,利用有限元法建立简化的碰撞模型,通过在局部损伤部位粘贴高弹模CFRP材料来提高桩腿的耐撞性能,验证高弹模CFRP加固方法,提高其耐撞性能的有效性。研究表明,相同的碰撞条件下,加固前碰撞力使桩腿产生了接近屈服强度的应力;粘贴2层CFRP布后,桩腿吸能下降56.3%,极值应力下降了14.7%;粘贴CFRP板后,桩腿吸能下降70.68%,桩腿的极值应力下降57.36%。The collision of the aging offshore platform with the ship can lead to the deformation of legs and reduction of the legs＇ bearing capacity. In order to reduce the collision force influence on the performance of the legs, and improve the collided resistance performance of legs, this paper presents the method of strengthening the damaged legs using high modulus CFRP with good energy absorption ability. The legs of a jack-up offshore platform are taken as an example to prove that the method of strengthening the damaged legs with high modulus CFRP is efficacious by using FEM. Research shows that under the condition of the same coUisi^n, the stress of legs unrein- forced is close to yield; when they are pasted 2 layers of high modulus CFRP cloth, the energy absorbed by legs drops by 56. 3%, and the extreme stress drops by 14.7% and when the high modulus CFRP plate is pasted, the energy absorbed by legs drops by 70. 68% , and the extreme stress drops by 57. 36%.

关 键 词：高模量CFRP 自升式海洋平台 碰撞 有限元法 损伤加固 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]