大型海中平台结构的消能减振设计方法研究
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摘要
某海中平台结构为椭圆形,台面尺寸95.0m×144.0m,标高13.40m,采用钢管混凝土桩,桩底标高-91.0m,用作海上救援和旅游观光等。考虑温度应力的影响,平台沿纵、横轴设置2道伸缩缝,将平台分为4个区;在地震、波浪等动力荷载作用下,4个分区各自将发生不规则的扭转振动,对结构受力与正常使用不利。因此,在伸缩缝中布置78只黏滞阻尼器,采用消能减振技术控制整体平台的振动反应。时程分析结果表明,采取消能减振措施后,基本消除各分区的扭转变形,且结构的振动反应均有较大幅度的降低,减振效果明显。
An elliptically shaped offshore platform structure,144m×95m,is for rescuing and sightseeing.The elevation of the platform surface is 13.40m,and the bottom of the steel tube confined concrete piles is-91.0m.The platform is divided into four parts by two expansion strips along its two symmetrical axes to consider the influence of temperature stresses,which will induce serious torsional displacements in the four parts of the platform structure under dynamic loads,such as earthquake and wave.The technique of energy-dissipated vibration-reduction is employed to control the vibration reaction of the offshore platform.The 78 viscous dampers intalled between the four parts can improved the vibration resistant capacity of the platform structure,while not restricting temperature deformation.The dynamic analysis results show that the platform structure with viscous dampers can essentially eliminate the torsion displacement and effectively reduce the displacement,velocity and acceleration reactions under dynamic loads.
An elliptically shaped offshore platform structure,144m×95m,is for rescuing and sightseeing.The elevation of the platform surface is 13.40m,and the bottom of the steel tube confined concrete piles is-91.0m.The platform is divided into four parts by two expansion strips along its two symmetrical axes to consider the influence of temperature stresses,which will induce serious torsional displacements in the four parts of the platform structure under dynamic loads,such as earthquake and wave.The technique of energy-dissipated vibration-reduction is employed to control the vibration reaction of the offshore platform.The 78 viscous dampers intalled between the four parts can improved the vibration resistant capacity of the platform structure,while not restricting temperature deformation.The dynamic analysis results show that the platform structure with viscous dampers can essentially eliminate the torsion displacement and effectively reduce the displacement,velocity and acceleration reactions under dynamic loads.
引文
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[3]刘伟庆,王曙光,等.宿迁市文体综合馆基础隔震设计[J].建筑结构学报,2003,24(2):20-24
[4]范立础.桥梁抗震[M].上海:同济大学出版社,1997
[5]李培润,王志农.海洋平台强度分析[M].上海:上海交通大学出版社,1992
[6]徐继祖,李维扬,汪克让,等.海洋工程结构动力分析[M].天津:天津大学出版社,1992
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