Diaphragm Effects on Ultimate Strength of Horizontally Curved Thin-Walled Box Girders.

隔膜对水平弯曲薄壁箱梁极限强度的影响。

基本信息

批准号：
08650556
负责人：
ARIZUMI Yasunori
金额：
$ 1.41万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

1.An analytical procedure is proposed to predict ultimate strength and nonlinear behavior of thin-walled, welded steel box-girder curved in plan and stiffened by intermediate interia diaphragms. In the approach, the effects of finite deformation, yielding of material under combined bending and St. Venant's torsioning, unloading caused by strain reversal, spreads of yielding, unloading and reloading zones in the cross-sections and along the gider, and residual stress due to welding are all taken into account in flexure analysis by nonlinear finite element method. How to consider local buckling of component plates and distortional warping in the nonlinear flexure analysis is also proposed.2.The comparison of the analytical with the experimental results on the ultimate strength was judged satisfactory.3.The local buckling of component plates can be evaluated by the proposed model of stress-strain curve allowing for plate buckling as shown in Fig. 3 and this model can be incorporated into … More the nonlinear flexure analysis.4.The breadth of buckling plate can be taken to be width of the compressive flanges of the cross-section of the girder and equal to the depth of the compressive zone of the web plate.5.The constitutive model predicted the local buckling compared well with the experimental results.6.The effect of distortional warping can be simulated in an incremental way at the initial strain-state in the nonlinear flexure analysis, where the strain increments for distortional warping are applied in a step-by-step procedure until an external distortional moment is reached.7.From lower level of loading, bowing deformation which is characterized by covnex form was experimentally confirmed at the compressive part web plate. This phenomenon might be considered to be that the cross-sectional part in compression in the curved girder acts as so-called nonlinear behavior of column with initial crookedness.The above results on the model tests in the conclusions are based on a limited amount of experimental work. Research is clearly needed on the experimental program of larger amount of the model-tests. Though some verification is necessary if the proposed constitutive models allowing for local plate-buckling is to be applied to the girder also stiffened by horizontal and/or vertical stiffeners, the assumed breadth of buckling plate is generally conservative. Less

1.提出了一个分析程序，以预测计划中的薄壁，焊接钢盒束的最终强度和非线性行为，并通过中间室内膜片僵硬。在这种方法中，有限变形的效果，在组合弯曲和圣维纳特的扭转下的材料的屈服，由应变逆转，屈服，屈服，卸载和重新加载区域在横截面以及沿GIDER中的卸货和重新加载区域引起的卸载，以及由于焊接而导致的残留应力，全部在非线性元素中都考虑到挠曲分析。还提出了如何在非线性弯曲分析中考虑局部屈曲的局部屈曲和扭曲的翘曲。2。分析的比较与最终强度的实验结果进行了比较。3。组件平板的局部屈曲可以通过所提出的压力 - 应力策略模型来评估，如图所示。屈曲板的宽度可以作为色带横截面的压缩法的宽度，并等于网板压缩区的深度。5。本构模型预测了局部屈曲与实验结果的比较。6。在非线性弯曲分析中，可以在初始应变态下以渐进的方式模拟扭曲扭曲的效果，其中将扭曲扭曲的应变递增用于逐步的过程中，直到达到外部变形矩。7。从较低的载荷级别，弓形的变形级别，由Covnex形式表征下来，由COVNEX形式进行了实验性的零件，这是经过压缩的网络。这种现象可能被认为是弯曲色带中压缩的横截面部分用作柱具有最初弯曲的柱的非线性行为。结论中模型测试的上述结果是基于有限的实验性工作。显然需要对大量模型测试的实验计划进行研究。尽管需要进行一些验证，如果拟议的构造模型允许局部板扣式弯曲，也可以通过水平和/或垂直加强剂来僵硬地将其僵硬，但假定的屈曲板的宽度通常是保守的。较少的