【作者】 钱仲慧；

【导师】 袁建力；

【作者基本信息】 扬州大学 ， 结构工程， 2006， 硕士

【摘要】 预应力混凝土结构的损伤模型可直接为震后有损伤结构的安全度评价与修复加固提供理论依据，并可为预应力混凝土结构的优化设计提供依据。我国建筑结构抗震设计目前采用的是“小震不坏，中震可修，大震不倒”的三水准设防原则。对于“中震可修”这一原则，如何正确地评价预应力混凝土结构在地震时的损伤程度，便成了结构抗震设计的一个重要内容。因此，构建预应力混凝土结构或构件的地震损伤评价模型，对于预应力混凝土结构抗震设计和可靠性分析及结构地震反应的计算机模拟都有实际意义。本文结合江苏省留学回国人员基金项目《预应力混凝土框架抗震优化程序》，针对已做的13根三种不同预应力度构件的低周反复加载试验，通过对预应力混凝土框架梁在不同荷载历程下滞回特性的进一步研究，构建了预应力混凝土梁地震损伤评价模型。在此基础上，以钢筋混凝土抗震分析程序SARCF (Seismic Analysisof Reinforced Concrete Frame)为蓝本，编制预应力混凝土框架抗震分析程序SAPCF(Seismic Analysis of Prestressed Concrete Frame)的基础文件。围绕预应力混凝土梁的损伤评价模型的构建，本文主要研究以下内容：1．为了使加载制度能模拟不同的地震模式，以研究构件在不同地震作用下的抗震性能，共设计了四种不同的加载方案，研究了荷载历程对不同预应力度构件的破坏弯矩、承载力、刚度以及耗能等的影响，为编制预应力抗震分析程序SAPCF提供了理论依据；2．在借鉴钢筋混凝土损伤评价模型的基础上，结合对预应力混凝土梁损伤—破坏特性的试验研究，初步构建了基于位移与能量耗散的预应力混凝土损伤—破坏模型。该模型的特点是建立了构件在循环荷载下任意曲率处的破坏弯矩与骨架曲线破坏弯矩的数学关系，并且提出了相应的荷载历程影响系数；3．通过对预应力构件的骨架曲线和滞回曲线特征的研究，在SARCF的基础上编制了以新的预应力损伤一破坏模型为依据的抗震分析程序SAPCF的基础文件，并通过实例分析验证了程序的正确性。更多还原

【Abstract】 Damage model of Prestressed concrete structures could be used for appraising safety degree and repairing damage structures directly. It also could be used for the optimizing design of prestressed concrete structures. At present, the goal in seismic design: no damage under minor earthquake; repairable under moderate earthquake; no collapse under rare earthquake, is used in the Chinese Code of Building Aseismic Design. For "repairable under moderate earthquake", how to appraise the damage degree of the prestressed concrete structures experienced moderate shock becomes an important part of the seismic design. So, the construction of prestressed concrete structures damage model is very meaningful for seismic design, reliability analysis and earthquake response simulation.Combining with the low-cyclic reversed loading tests of thirteen prestressed concrete frame beams which are included in the project Seismic Analysis Optimizer of the Prestressed Concrete Frame of the fund for the scholars who study and return form abroad, through the hysteretic character research based on the tests of prestressed concrete frame beams under different loading histories, we make prestressed concrete structures damage model and build the program of Seismic Analysis of Prestressed Concrete Frame (SAPCF) as development of Seismic Analysis of Reinforced Concrete Frame (SARCF).Centred on the prestressed concrete structures damage model, this paper explores the parts below:1. In order to research the seismic performance of the elements under different earthquake modes, we use four different kinds of loading histories to simulate different earthquake modes. This paper researches failure curve, stiffness deterioration, bearing capacity decline and energy dissipation under different loading histories for three different kinds of partial prestressing ratio (PPR) elements. We build the program SAPCF based on these researches.2. On the base of reinforced concrete structures damage model and damage-failure research about prestressed concrete frame beams, we use the theory of energy dissipation to build prestressed concrete structures damage model. This model gives the relationship between failure moment under cyclic loading at any curvature and failure moment of primary moment-curvature curve. We also obtain the loading history influence coefficients.3. Through the research of primary moment-curvature curve and hysteretic curve and the new prestressed damage model, we compile the basic files of program SAPCF as a development of SARCF. Compared to the tested beams, we prove the program is useful.更多还原