遮帘式板桩码头抗震特性及设计参数研究

板桩码头是港口工程建筑物一种重要的结构形式,但受墙身高度限制,只适用于中小码头建造。遮帘桩的加入,极大地改善了前墙受力,使码头泊位大型深水化成为可能。作为一种新型的结构形式,遮帘式板桩码头抗震特性尚不清楚,地震破坏机理与变形灾变性能是抗震安全设计中需考虑的较复杂的问题。基于非线性有限元分析技术,考虑遮帘桩到前墙间距、遮帘桩长度和遮帘桩厚度等一系列抗震设计参数,研究不同参数时,遮帘式板桩码头前墙残余变形分布特征、墙身以及拉杆受力特性,阐述各设计参数下板桩码头的抗震机理和变形特性,给出各设计参数的合理抗震取值,研究结果为遮帘式板桩码头的抗震安全设计提供参考。

Seismic behavior and design parameters of covered sheet-pile quay

The sheet-pile quay is an important port structure only used in the small quay construction because of the restriction of the wall height.The large-scale deep water berths will be realized due to that covered sheet pile greatly strengthens the force of the front wall.As a new structure,there is no mature theory and method of covered sheet-pile quay,and the seismic characteristics and mechanism is unclear.The seismic residual deformation and seismic mechanism of sheet pile quay are complex problems in the seismic safe design of sheet pile quays.Based on the nonlinear finite element method,a series of seismic design parameters were considered such as spacing between the covered pile and the wall,seismic acceleration amplitude,the length,thickness,intension of the covered pile.The seismic residual deformation and stress characteristics of covered sheet-pile walls and mechanical characteristics of rods are analyzed,seismic mechanisms and deformation characteristics of covered sheet-pile quay are studied in detail and the seismic effect is confirmed under different parameters.Finally,the reasonable seismic design values of design parameters are presented.The achieved results may serve as reference for the seismic safe design of covered sheet-pile quays.