中文摘要：

为提供用于半刚性连接结构分析与设计所需连接弯矩—转角关系,应用有限单元法对梁柱外伸端板连接抗弯性能进行了分析.首先,应用大型通用有限元软件ANSYS建立了连接的三维实体有限元模型.模型考虑了材料非线性、几何非线性、接触非线性和螺栓预拉等因素的影响.需指出的是,连接螺栓应用由精确模拟螺纹尺寸的有限元分析校准的模型来模拟.利用已有试验结果验证了模型的正确性.然后,利用上述模型对端板外伸部分设置三角形加劲肋和未设置加劲肋的连接抗弯性能进行分析,讨论了端板厚度、柱翼缘厚度、螺栓直径、螺栓到梁翼缘与腹板的距离、梁截面高度、材料屈服强度等参数对连接弯矩—转角性能的影响.最后,根据分析结果提出了两种构造端板连接的弯矩—转角关系计算公式,通过与试验和有限元分析结果的比较,验证了该公式的有效性和准确性.

英文摘要：

In order to supply connection moment-rotation relationship curves required in the analysis and design of semi-rigid connected structures,beam-to-column extended endplate connections were analyzed by using a finite element method.Firstly,a finite element model was set up by using a large-scale general purpose code,ANSYS.Material nonlinearity,geometric large deformation,contact-friction behavior and bolt pretension were taken into account.It is noted that the bolts in connection were modeled with using a proposed model verified by the refined finite element analysis in which the complex geometries of threads were realistically modeled.The accuracy of finite element model was verified by the comparison of the numerical and experimental results.Then the behavior of the stiffened and the un-stiffened endplate connections under the bending moment,were analyzed by using the aforementioned finite element model.Influences of some factors,such as,beam depth,endplate thickness,stiffer for endplate,bolts grade and diameters,piths of bolt holes,thickness of column flange,on the connections rotational stiffness,flexural resistance and ductility,were discussed in detail.Finally,based on the analysis results,moment-rotation relationship prediction equations for the un-stiffened and stiffened endplate connection behavior were developed.Meanwhile,the prediction equations were validated by comparison between experimental and finite element analysis results.