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本文着重对:1.《TJ10—74》和《CEB—FIP》关于预应力混凝土的分类,进行了比较,指出了两者的优缺点。2.从广义度的概念出发,将预应力度和抗裂度有机地联系起来,对预应力混凝土的分类进行了探讨,提出了分为三类五级的建议,即[Ⅰ_a]、[Ⅰ_b]、[Ⅱ]、 [Ⅲ_a]和[Ⅲ_b]。将[Ⅰ]类分为两级[Ⅰ_a]、[Ⅰ_b],扩大了应用范围,比较经济合理,将[Ⅲ]类分为验算与不验算裂缝宽度两级[Ⅲ_a]、[Ⅲ_b],从而比较全面地概括了所有情况。3.还对各国预应力混凝土的分类概况进行了综合比较,概括为两大类型,一是以预应力度来表达,二是以抗裂度来表达,同时与本文的建议进行了比较,表明本建议的概念清楚,计算方便。4.在部分预应力混凝土一般设计原则的基础上,对抗裂度、活载与恒载之比,以及活载抗裂系数三者之间的关系,进行了分析。所得结果,对分析裂缝的出现,常遇活载的取值和抗裂度的选用,有一定的帮助。
This article focuses on: 1. “TJ10-74” and “CEB-FIP” on the classification of prestressed concrete, compared and pointed out the advantages and disadvantages of the two. 2. Starting from the concept of generalized degree, the prestress degree and the crack resistance degree are organically linked, the classification of prestressed concrete is discussed, and the recommendations divided into three categories are proposed: [I_a], [I_b ], [II], [III_a] and [III_b]. The [I] class is divided into two levels [I_a] and [I_b], which expands the scope of application and is relatively economical and reasonable. The [III] class is divided into two levels [III_a] and [III_b] of checking and non-calculating crack widths. A more comprehensive overview of all situations. 3. The comprehensive classification of prestressed concrete in different countries was comprehensively compared and summarized as two major types. One is to express the degree of prestress, and the other is to express the degree of crack resistance. At the same time, it compares with the recommendations of this paper, indicating that The concept of this proposal is clear and easy to calculate. On the basis of the general design principles of partial prestressed concrete, the relationship among the anti-cracking, the ratio of live load to dead load, and the relationship between live load cracking resistance are analyzed. The results obtained are of certain help in analyzing the occurrence of cracks, the selection of the value of live load and the selection of crack resistance.