Variation of Structural Characteristics of Steel Members Caused by Variation of Steel Materials

钢材材质变化引起钢构件结构特性的变化

• 批准号: 05452252
• 负责人: NAKASHIMA Masayoshi
• 金额: $ 3.78万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452252/
• 关键词: building; seismic design; ductility; strength; variation; structural analysis; 鋼構造; 塑性変形能力; 信頼性; ひずみ硬化; 鉄骨柱

This report presents a study on the variation of structural characteristics of steel members induced by the variation of their materials. To this end, a number of steel beam-columns were tested with the material properties as the major parameter. Numerical analysis was also conducted, in which material properties of the steel were varied and their effects on the strength and ductility of steel beam-columns were examined statistically. An object-oriented database that contains results of previous laboratory tests was also developed to assist in statistical evaluation. Based upon the test and analysis, it was found (1) that the structural characteristics are largely dependent on the strain hardening properties of the steel material, and, in particular, the member ductility is strongly influenced by the degree of strain hardening and (2) that, although the yield ratio, defined as the yield stress relative to the maximum strength, is believed to be a handy index to quantify the degree of strain hardening, this index is yet too crude to be used for accurate estimation of ductility variation. Considering the degree of variation expected in the steel materials that are commercially available, the strength and ductility of steel beam-columns would likely to vary about 10 to 20 % and 50 to 100 % in terms of the coefficient of variation, respectively.

本文研究了钢构件因材料变化而引起的结构特性变化。为此，以材料性能为主要参数，进行了多根钢压弯构件的试验研究。数值分析中还进行了不同的材料性能的钢和钢梁柱的强度和延性的影响进行了统计检查。还开发了一个包含以前实验室测试结果的面向对象的数据库，以协助进行统计评价。根据试验和分析，发现（1）结构特性在很大程度上取决于钢材的应变硬化特性，特别是构件的延性受应变硬化程度的强烈影响，（2）尽管屈服比，定义为屈服应力相对于最大强度，虽然被认为是一个量化应变硬化程度的简便指标，但该指标过于粗糙，不能用于精确估计延性变化。考虑到市售钢材的预期变化程度，钢梁柱的强度和延性可能分别在变化系数方面变化约10%至20%和50%至100%。

项目成果

中島 正愛: "オブジェクト指向型データベースを用いた構造実験情報の管理・保存" 構造工学論文集. Vol.40B. 253-259 (1994)

Masaaki Nakajima：“使用面向对象数据库管理和存储结构实验信息”《结构工程学报》第 40B 卷（1994 年）。

Nishino, T., Nakashima, M., and Tsuji, B.: " "Prediction of Post-Buckling Strength of Steel Braces, " (in Japanese)." Proceedings of JSSC Tokyo, Japan. 163-170 (1993)

Nishino, T.、Nakashima, M. 和 Tsuji, B.：““钢支撑屈曲后强度的预测”（日语）。

Nakashima, M.: ""Variation of Ductility Capacity of steel Beam-Columns, "" Journal of Structural Engineering, ASCE. Vol.120, No.7. 1941-1960 (1994)

Nakashima, M.：“钢梁柱延展性能力的变化”，《结构工程杂志》，ASCE。

中島 正愛: "ひずみ硬化を考慮した鉄骨柱部材の耐力評価" 鋼構造年次論文報告集. No.1. 615-621 (1993)

Masaaki Nakajima：“考虑应变硬化的钢柱构件强度评估”钢结构年度论文报告第 1. 615-621 (1993)。

中島 正愛: "水平力を受ける鉄骨骨組における構造部材への要求塑性変形とその変動" 第9回日本地震工学シンポジウム. Vol.2. 2065-2070 (1994)

Masaaki Nakajima：“水平力作用下钢框架结构构件所需的塑性变形及其变化”第 9 届日本地震工程研讨会第 2 卷，2065-2070 年（1994 年）。