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Computer aided design system on self-adjustable arrangement of reinforcing bars with smart fictitious material modeling

具有智能虚拟材料建模的钢筋自调节布置计算机辅助设计系统

基本信息

批准号：
13555121
负责人：
ISHIDA Tetsuya
金额：
$ 7.68万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555121/
关键词：
Smart fictitious material modeling non-linear dynamics analysis design of reinforcement arrangement contact density function finite element analysis reinforced concrete shear capacity 非線形解析計算機補助設計仮想材料設計システム性能設計

项目摘要

The results of this research can be summarized as follows.(1) A special constitutive model of steel (smart fictitious material model) was adopted in the FEM code COM3 performing non-linear dynamic analysis of reinforced concrete structure. The proposed system was used to predict mechanical behaviors of reinforced concrete under two-dimensional and three-dimensional stress fields. Especially, a structure with an opening in the span, which may bring complex stress condition, was chosen as an example of its application. Through the study, it was shown that appropriate arrangement of reinforcement in such conditions can be automatically given, and that the specified arrangement can provide desire loading capacity. In additon, the system was applied to a design was successfully reduced down to 1/2 〜1/3 of that determined by ordinary design method.(2) In order to enhance the proposed design system, the zoning method was generalized. In the previous zoning method, the RC zone was overestimated at the point of steel yielding, while in this study the model was extended to describe both significant localization of cracking and spatial averaged state at steel yielding as a form of strain-softening-transient hardening. By this extension, the shear capacity and stiffness of member can be predicted with higher accuracy.(3) In the smart fictitious material model, local stress of reinforcement between cracks, dowel action, local deformation and bond deterioration are simplified by applying spatial-averaged approach. In this study, in order to treat these aspects in a generalized way, an enhanced stress transfer model based on microscopic nonlinearity and contact density function was proposed. It was shown in this study that the proposed model can quantify the effect of non-orthgonality of crack and reinforcement on the averaged deformation in finite element, and it allows the proposed design system to have higher accuracy.

这项研究的结果可以总结如下。(1)在对钢筋混凝土结构进行非线性动力分析的有限元程序COM 3中，采用了一种特殊的钢材本构模型（智能虚拟材料模型）。该系统被用来预测钢筋混凝土在二维和三维应力场下的力学性能。特别是以跨中开孔结构为例，分析了开孔结构的受力情况。通过研究表明，在这种情况下，可以自动给出适当的钢筋布置，并且指定的布置可以提供期望的承载力。此外，将该系统应用于一个设计中，成功地将设计结果缩小到普通设计方法的1/2 ~ 1/3。(2)为了加强所提出的设计系统，分区方法进行了推广。在以前的分区方法中，钢筋混凝土区域被高估的点，钢屈服，而在这项研究中，该模型被扩展到描述显着的本地化的开裂和空间平均状态，在钢屈服的应变软化瞬态硬化的形式。通过这种扩展，可以更准确地预测构件的抗剪承载力和刚度。(3)在智能虚拟材料模型中，采用空间平均法对裂缝间钢筋的局部应力、传力杆的作用、局部变形和粘结破坏进行了简化。在这项研究中，为了处理这些方面在一个广义的方式，一个增强的应力传递模型的基础上，微观非线性和接触密度函数的建议。结果表明，该模型能够定量分析裂缝和钢筋非正交性对有限元平均变形的影响，使设计系统具有较高的精度。