期刊文献+

混凝土结构材料应变软化非线性迭代的局部弧长法

Local Arc-length Method of Strain-Softening and Nonlinear in Concrete Structure Material
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摘要 针对具有应变软化材料的混凝土荷载-挠度曲线在极值点附近往往出现跳跃或后跳特性的问题,提出了一种适宜于混凝土材料拉应变软化的局部弧长法.该方法采用相对位移参数结合结构中局部裂缝区的约束方程,能有效跟踪复杂的平衡路径包括后跳现象.算例结果表明局部弧长法的这些优越性,并且分别指出了切口深度以及弹性模量对裂缝口滑动位移的影响. The pre/post-peak load-displacement curve of concrete is usually characterized by snapthrough or snap-back. Accordingly, this paper presents a local arc-length methord which is capable of overcoming snap-back and is advanced by arc-length. The method adopts relative displacement parameter with constraint equation at local fracture process zone in structure, and can track complex eguilibrium paths including snap-back with efficiency. The numerical example validates these priorities of local arclength and points out the effect of notch depth and modulus on the crack sliding displacement.
出处 《江南大学学报(自然科学版)》 CAS 2008年第2期207-210,共4页 Joural of Jiangnan University (Natural Science Edition) 
基金 国家自然科学基金项目(50579081) 浙水电专科研基金项目(XK200713)
关键词 混凝土裂缝 应变软化 混合裂缝模型 局部弧长法 切口深度 concrete crack strain-softening mixed-model crack propagation local arc-length notchdepth
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参考文献8

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