结构钢在应力三轴空间的宏观韧-脆断机理及梁柱连接抗断设防

项目名称： 结构钢在应力三轴空间的宏观韧-脆断机理及梁柱连接抗断设防

项目编号： No.50808098

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 王万祯

作者单位： 兰州理工大学

项目金额： 21万元

中文摘要： 基于损伤力学和Mises屈服理论对结构钢屈服和断裂解释的不融洽，以结构钢在三向等拉伸应力状态下屈服和断裂重合的保守假设为前提，原创性地 提出了结构钢椭球面断裂模型及耦联的椭球面屈服模型。 利用ANSYS软件中的参数化设计语言APDL和用户编程功能UPFs，将建议的结构钢椭球面屈服模型编制成有限元子程序模块，通过ANSYS软件的开放式接口实现了椭球面屈服模型的程序编制。 进行了结构钢（Q235和Q345）、铝合金和、焊材（E43型和E50型）刻痕杆、开孔板、缺口板和开孔管共计415个试件的常、低温断裂试验，和基于结构钢椭球面屈服模型的数值模拟，较广泛地验证了结构钢结构钢椭球面断裂模型的精度和普适性。 以结构钢椭球面断裂模型为判据，进行了方钢管混凝土柱-H型钢梁节点和箱型柱-H型钢梁节点断裂机理分析，提出了梁翼缘和腹板开孔型方钢管混凝土柱-H型钢梁节点构造、梁翼缘开长槽孔及对接焊缝扩大头型箱型柱-H型钢梁节点构造。对6个方钢管混凝土柱-H型钢梁节点和6个箱型柱-H型钢梁节点梁柱节点进行了低周往复循环加载试验，提出 对T型钢桁架节点和焊接空心球节点进行了基于结构钢椭球面断裂模型的断裂机理分析

中文关键词： 结构钢；椭球面断裂模型；椭球面屈服模型；梁柱节点；试验

英文摘要： Based on the disagreement of yield and fracture of metal in damage mechanics and Mises yield theory, an elliptical fracture model together with an elliptical yield model are originally proposed for constructional steels on the assumption that constructional steels in tri-axial symmetrical tension stress field yield and fracture almost at the same time. The suggested elliptical yield model of constructional steels is implemented in finite element program based on the software ANSYS by using of ANSYS Parametric Design Language (APDL) and User Programmable Features (UPFs). The total number 415 of notched bars, plates with hole, notched plates and notched tubes fabricated from steels, aluminum alloy and weld metal, are tested at room temperature and low temperature. The precision and applicability of the suggested elliptical fracture model are widely verified by numerical analysis on the above tested specimens based on the suggested elliptical yield model. Fracture mechanism of joints of H-section steel beam-square steel tubular column filled with concrete and joints of H-style steel beam-square steel tubular column are studied based on the suggested elliptical fracture model. Joints of H-style steel beam-square steel tubular column filled with concrete with opening hole at beam flanges and joints of H-style steel beam-square steel tubular column with slot holes and horizontal haunch at beam flanges are designed. Low-cycle reversed loading tests were performed on six joints of H-style steel beam-square steel tubular column filled with concrete and six joints of H-style steel beam-square steel tubular column. Design suggestions are given for beam-colum connections. Fracture mechanism of steel struss joints and hollow spherical joints are studied based on the suggested elliptical fracture model.

英文关键词： constructional steel; elliptical fracture model; elliptical yield model; beam-colum connections; test