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1.引言 近海结构物的水下深度日益增加。因此需要对现行设计方法予以重新评价。从40年代以来,近海结构物的水下深度呈直线增长趋势(图1)。在Santa Barbara海峡建立的水深260米的固定式钢结构平台,和为墨西哥湾设计的水深300米的同类平台,则是上述增长趋势的例外。为了进行水深约1000米的水下开发,这些新的设计表明,近海平台正在加速发展。
1. INTRODUCTION The underwater depth of offshore structures is increasing. Therefore, the current design method needs to be re-evaluated. Since the 1940s, the underwater depth of offshore structures has shown a linear growth trend (Figure 1). The 260-metre fixed steel platform established in the Santa Barbara Channel and similar platforms designed for the Gulf of Mexico with a water depth of 300 meters are an exception to this growth trend. For underwater development with a water depth of about 1,000 meters, these new designs show that offshore platforms are accelerating.