基于中欧规范混凝土梁正截面和斜截面承载力计算的对比研究

发布时间：2018-01-10 16:43

  本文关键词：基于中欧规范混凝土梁正截面和斜截面承载力计算的对比研究　出处：《昆明理工大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 钢筋混凝土受弯构件 正截面承载力 斜截面承载力 规范对比

【摘要】：本文针对我国现行《混凝土结构设计规范》在正截面和斜截面承载力计算中存在的不完善之处,分析其存在不完善的原因,从构件在正截面和斜截面存在的问题入手,全面分析和对比欧洲现行《混凝土结构设计规范》和我国混凝土设计规范在计算两者承载力方面的异同。下面具体说明在这两方面所做的工作：(1)构件正截面承载力计算方面：首先,对比分析我国现行《混凝土结构设计规范》和欧洲《混凝土结构设计规范》在对构件的正截面承载力计算中,都采用“等效矩形应力模型”时给混凝土构件的配筋计算带来一些问题；进一步深入研究欧洲《混凝土结构设计规范》在针对自身缺陷时,怎样从截面应变分布出发,再由应变通过混凝土和钢筋完整的本构关系确定相应的内力值大小,进而计算出截面的抵抗弯矩,及怎样利用混凝土和钢筋本构关系,将构件截面在不同受力状态下的可能应变分布,划分为5个应变区域并进一步推导出方便、简洁的构件配筋计算新方法—无量纲图表法。其次,针对我国现行《混凝土结构设计规范》虽然在6.2.1条中给出混凝土和钢筋的本构关系,但不能完整地利用它,而只能利用混凝土受压极限应变εc=-3.3‰这一点,给构件的配筋计算带来的问题,具体分析了导致这些问题存在的本质原因,对改善规范的不完善和矛盾之处提出具体的建议。(2)构件斜截面承载力计算方面：全面分析和比较我国现行《混凝土结构设计规范》和欧洲《混凝土结构设计规范》的斜截面抗剪承载力计算理论,深刻理解和学习欧洲《混凝土结构设计规范》是怎样利用桁架抗剪模型,清晰地解释构件的抗剪受力机理,并基于桁架模型建立起一套系统、全面的抗剪计算公式,希望能够从中借鉴和汲取其系统、科学、先进的计算理论体系及设计理念,从而为完善和改进我国《混凝土结构设计规范》在这方面的计算理论提供必要的理论依据。
[Abstract]:In view of the imperfections in the calculation of the bearing capacity of normal and oblique sections in the present Code for Design of concrete structures in China, this paper analyzes the reasons for the imperfections in the calculation of the bearing capacity of normal sections and oblique sections. Starting with the problems of members in normal section and oblique section. A comprehensive analysis and comparison of the existing European Code for the Design of concrete structures and the differences in the calculation of their bearing capacity between the existing European Code for Design of concrete structures and the Code for concrete Design in China. The following is a detailed description of the work done in these two areas: 1). The calculation of normal section bearing capacity of members is as follows: first of all. This paper compares and analyzes the present concrete structure Design Code in China and the European concrete structure Design Code in the calculation of the normal section bearing capacity of the members. When "equivalent rectangular stress model" is adopted, it brings some problems to the reinforcement calculation of concrete members. Further further study on the European Code for Design of concrete structures in view of their own defects, how to proceed from the cross-section strain distribution. Then through the complete constitutive relation of concrete and steel bar, the corresponding internal force is determined, and then the resistance moment of section is calculated, and how to use the constitutive relation of concrete and steel bar is calculated. The possible strain distribution of the member section under different stress states is divided into five strain regions and a new convenient and concise method for calculating the reinforcement of the member is presented. Secondly, the dimensionless chart method is used. Although the constitutive relation between concrete and steel bar is given in 6.2.1, the present Code for Design of concrete structures in China can not make full use of it. The ultimate strain of concrete under compression 蔚 c ~ (3) 鈥，

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