【作者】 吴可训；

【导师】 叶献国；

【作者基本信息】 合肥工业大学 ， 结构工程， 2004， 硕士

【摘要】 钢筋混凝土结构分析和强度计算，传统方法是采用建立在大量试验研究基础上的简化计算公式。但是采用简化的计算公式，许多复杂的影响因素就被忽略了，随着钢筋混凝土结构形式应用面地不断扩大，需要对其进行更精确的分析。论文介绍了钢筋与混凝土材料在复杂应力状态下的破坏准则和本构关系，以及钢筋混凝土结构非线性分析的模型、理论及方法。编制了基于条带划分方法的非线性分析程序对异形截面柱(L、T、十)进行了分析和计算。程序中考虑了混凝土应力应变曲线的下降段及箍筋对混凝土的约束影响，采用了合适的算法加速计算过程并考虑了纵筋锚固滑移的影响，通过正交试验分析了混凝土强度、体积配箍率、轴压比和荷载角对异形柱截面抗弯承载能力及截面曲率延性比的影响。编制了基于有限元方法的平面钢筋混凝土结构非线性分析程序，混凝土采用了非线性弹性模型而裂缝的描述采用了弥散裂缝模型，通过与—根试验梁的对比，结果是令人满意的，可以弥补一些通用有限元软件在分析某些专业问题上的不足。最后应用了通用有限元软件ANSYS，比较了ANSYS所提供的一些本构模型，认为用多线形随动强化模型可以较好地模拟混凝土的本构关系，并用ANSYS对文章中的算例进行了验证。更多还原

【Abstract】 The traditional method of analysis of RC structure is based on experiential formula, which are concluded from large numbers of experiments. With that experimental formula, many complex factors are ignored. The domain of RC structure is evidently enlarging in recent years, so more precise analyses are needed for engineering practice. This paper thoroughly explains the constitutive equations and failure criteria under multiaxial stress state. Models and methods of the nonlinear analysis are introduced in this paper also. Program is complied under gridding partition method to calculate the special-shaped column. In this program, the declining segment of the stress-strain relation of the concrete, the restriction effect of hooped reinforcement and the bond-slip problem of the reinforcement are considered, as the same time the optimized arithmetic is applied to accelerate calculation procedure. Though the appropriate experiment arrangement, the influential factor such as the strength of concrete, the ratio of hooped reinforcement, the ratio of axial compression and the loading angle are researched, some available rules of carrying ability and ductility of the special-shaped column can be attained. Program under the finite element method is also compiled in this paper; the nonlinear-elastic model of concrete and the smeared-cracking model are adopted in this program. Though comparing with the experiment results, the precision of that program is satisfactory. So that program is a good complement to some popular general propose finite element code. At last, general propose finite element code ANSYS is adopted, with comparing the different material models that ANSYS provide, it is find that using multilinear kinematic hardening model can acquire good results, so the example in the paper is recalculated using multilinear kinematic hardening model in ANSYS.更多还原