Keywords : geometric nonlinearity , sag effect , equivalent modulus of elasticity , vehicle - bridge interaction 关键词：几何非线性、中垂效应、等效弹性系数、车桥互制。
2.
But in 3d space , the sibson coordinate value is the ratio between the volumes of voronoi cells , and the voronoi cell is made up of the perpendicular face 但推广到三维空间中, sibson局部坐标值变为voronoi单元的体积之比,而且voronoi单元由三角划分得到的四面体棱的中垂面生成, voronoi单元由面变成体,直观性差,计算也变得相当复杂。
3.
If not , increase the curvature , and redo the above steps until get the ultimate strength . in the thesis the author analyzes the tripping of stiffened panels by three different methods . based on the above method , the author calculates the ultimate longitudinal strength of a boxlike girder , several ships and many stiffed panels by program 当船体梁在中拱或中垂状态下时，假定一个初始曲率，累积各个单元对瞬时中和轴的弯矩，然后判断弯矩是否达到极限，如未达到，则增加曲率，重复上述过程，直至弯矩为极值。
4.
Based on previous study of pollutant dispersion in vertical direction , an empirical formula for determining the mean value of turbulence viscosity coefficient in numerical simulation of tides in vertical direction was worked out and applied to 3 - d numerical simulation of tides for changxing island reach in yangtze river estuary 摘要在已有污染物垂向扩散过程研究的基础上，提出了确定潮流数值模拟中垂向紊动黏性系数的垂线平均值的经验方法，并将此方法应用到长江口长兴岛段的潮流三维数值模拟中。
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Based on an integrated analysis of geochemical and geological data from the surface and the boreholes of the yakela gas condensate field in tarim basin , the authors hold that there exist fine internal relations between borehole vertical geochemical characteristics of this gas field , geological factors controlling vertical percolation of hydrocarbon and surface geochemical anomalies 通过对塔里木盆地雅克拉凝析气田上的地表、井中化探资料与地质资料的综合分析，认为该气田的井中垂向地球化学特徵、控制烃类垂向微渗漏地质因素、地表化探异常显示之间呈现出很好的内在联系。
6.
Firstly , it needs to separate the girder hull into many elements - pulled one and pushed one . secondly , when the ship is in hogging or sagging , you should assume one curvature value so you can get the moment value of every element at this curvature . and then you may add up all the moment of every element 当船体梁在中垂或中拱状态下时，假定一个初始曲率，根据各个单元对瞬时弹性中和轴弯矩的贡献，累加得到相对于这个曲率的总弯矩，然后判断弯矩是否达到极值，如未达到，则增加曲率，重复上述过程，直到弯矩为极值为止。
7.
This thesis used along caldwell ' s direct calculation method of the ultimate strength of ship hull girders , considered the double bottom and upperwing tank to ship ultimate strength contribution , first defined the stress distribution of the whole section of the ship girders . that is : in the sagging condition , deck and side shell of nearby deck remain the ultimate bucking strength , double bottom remain the yield stress . and the other parts keep elasticity 本文沿用caldwell等人直接计算船体极限强度的思想，考虑双层底和顶边水舱对船体极限强度的贡献，首先将船体梁整体破坏时剖面应力分布确定为：在中垂状态下，甲板及甲板附近的舷侧均屈曲，双层底区域则均屈服，其他部分保持弹性状态；在中拱状态下，双层底及之间的底舷侧均屈曲，甲板及顶边水舱区域均屈服，其他部分则保持弹性状态。
