考虑粘结滑移的SRC梁柱单元宏观模型建模理论及方法研究

基于型钢混凝土组合结构粘结滑移机理,将型钢混凝土梁柱单元积分段中型钢纤维的轴向变形分为型钢的轴向变形和粘结滑移两部分,依据平截面假定,以此来描述型钢和混凝土变形的差异,从而反映粘结滑移效应。通过将粘结滑移本构引入到既有的型钢单轴本构模型中,推导出考虑粘结滑移效应型钢本构模型,并提出纤维状态的确定方法。利用OpenSEES有限元平台,将建立的材料本构模型植入到软件中,并应用该材料对SRC框架柱进行数值模拟分析。通过模拟结果与试验结果的对比,验证新材料的合理性和准确性。

RESEARCH ON FINE MODELING THEORY AND METHOD IN STEEL REINFORCED CONCRETE STRUCTURES BASED ON BOND-SLIP

Based on the bond slip mechanism of a steel-reinforced-concrete (SRC) structure, the axial deformation for steel fibers in the integral segment of SRC beam-column elements is divided into an axial deformation of steel and a bond slip. This method can describe the inconsistent deformation between steel and concrete to reflect the bond slip effect according to the plane-section assumption. Through the bond-slip constitutive model embedded to an existing steel constitutive model, a new steel constitutive model with bond-slip effect is established and the way for determining the status of steel fibers is proposed. Then the numerical analysis of an SRC frame column is conducted with a new material model implanted into OpenSEES program. Eventually, by comparing the numerical result with the experimental data, the reasonableness and accuracy of the new material model can be verified.