Nonlinear Restrains翻译？ 回复 1# zero229 nonlinear restraints are defined as restraints whose stiffness is not uniform along the line of action of the restraint. 刚度沿着约束运动方向不一致的这类约束被成为非线性约束 uni-directional restraints (for example, pipe resting on a rack), restraints with a gap, and bi-linear restraints are all nonlinear. 单向约束（如，管道搁在管架上），带有间隙的约束和双线性约束都是非线性的。 whereas fully bidirectional restraints are linear. 而完全双向约束是线性的。 the following illustration shows force vs. displacement curves for several linear and nonlinear restraints in caesar ii. 下图所示为caesar ii软件中几种线性与非线性约束的力与位移的曲线 note the slope of the curve dictates the stiffness of the restraint (rigid restraints have an almost vertical slope). 请注意曲线的斜率表征的即为约束的刚度（刚性约束斜率几乎趋向无穷，即90度） all nonlinear restraints have more than one stiffness in their force vs. displacement curves while all linear restraints have a constant stiffness. 所以的非线性刚度在其力与位移的关系曲线上都具有多个刚度，而所有的线性约束只有唯一的恒刚度。 这段话应该是管道应力分析软件caesar ii中关于管道约束，自由度的描述。查看更多
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