高强钢组合单层单跨K型偏心支撑钢框架受力性能有限元分析

发布时间：2018-05-17 19:34

本文选题：高强钢组合 + K型偏心支撑钢框架　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：高强钢组合偏心支撑钢框架体系是一种高效的抗震钢结构体系，其耗能梁段采用强度较低、变形能力较强的钢材(如Q235或Q345)，保证结构在强烈地震下有良好的塑性变形和耗能能力，，其他构件采用高强度钢材(如Q420、Q460或Q690等)以节约材料从而降低造价，该体系综合了高强钢承载能力高和偏心支撑钢框架抗震性能好的优点，但是目前国内外对这种结构形式抗震性能的研究非常匮乏。本文在充分参考这两个领域研究成果的基础上，采用ABAQUS建立有限元模型，选择C3D8R实体单元，综合运用结构及扫掠网格划分技术，利用随动强化本构模型，充分考虑材料与几何非线性，用结合Newton-Raphson迭代法及增量法的ABAQUS隐式求解器，模拟了结构在循环荷载作用下的受力性能，并结合剪切型和弯曲型高强钢组合单层单跨K型偏心支撑钢框架单调加载和循环加载试验所得的数据，验证了ABAQUS有限元软件建模模拟分析的正确性和有效性。通过对五组影响结构性能的参数模型的计算与分析，包括不同材料组合、耗能梁段长度、耗能梁段腹板厚度、高跨比及加劲肋间距的变化，给出了结构荷载位移曲线、滞回曲线、骨架曲线、刚度位移关系曲线及部分应力云图和变形图，分析了极限承载力、刚度、延性、耗能性能的变化规律，阐述了剪切型高强钢组合K型偏心支撑钢框架与弯曲屈服型框架破坏模式的差异。最后，根据有限元分析结果，得出相关结论并给出设计建议，可供工程设计参考。
[Abstract]:High strength steel composite eccentrically braced steel frame system is an efficient aseismic steel structure system, and its energy dissipation beam section is of low strength. Steel with strong deformation capacity (such as Q235 or Q345C) ensures that the structure has good plastic deformation and energy dissipation capacity under strong earthquakes, and other members use high strength steel (such as Q420, Q460, Q690, etc.) to save materials and thus reduce the cost. The system combines the advantages of high strength steel bearing capacity and good seismic performance of eccentrically braced steel frame, but the research on seismic behavior of this kind of structure is very scarce at home and abroad. On the basis of fully referring to the research results in these two fields, the finite element model is established by using ABAQUS, the C3D8R entity element is selected, the structure and swept mesh generation technique is used synthetically, and the following enhanced constitutive model is used. Considering the material and geometric nonlinearity, a ABAQUS implicit solver combined with Newton-Raphson iterative method and incremental method is used to simulate the behavior of the structure under cyclic load. The validity and validity of the modeling and simulation analysis of ABAQUS finite element software are verified by combining the data obtained from monotonic loading and cyclic loading tests of single monolayer single span eccentric braced steel frame with shear and bending high strength steel. Through the calculation and analysis of five groups of parameter models which affect the performance of the structure, including the changes of different material combinations, the length of the energy dissipation beam, the thickness of the web of the energy dissipation beam, the ratio of height to span and the distance between stiffened ribs, the load-displacement curve of the structure is given. The hysteretic curve, skeleton curve, stiffness displacement relation curve, partial stress cloud diagram and deformation diagram are analyzed, and the variation rules of ultimate bearing capacity, stiffness, ductility and energy dissipation performance are analyzed. The difference of failure modes between shear type high strength steel composite K type eccentrically braced steel frame and bending yield type frame is expounded. Finally, according to the results of finite element analysis, the relevant conclusions and design suggestions are given, which can be used as a reference for engineering design.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391

【相似文献】