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一、研究工作概述各主要工业国家的钢筋混凝土结构规范,包括我国现行TJ10-74规范,关于预应力混凝土构件预拉区的设计与计算方法均尚未达到完善的地步。为了寻求比较合理的设计计算方法,必须进行一系列试验研究工作和理论研究工作。首先专题组有关单位在1975～1980年先后进行了三批共47根矩形、T形、⊥形截面(翼缘宽度(b_~′)/(b)[(b_i)/b]=2.14)预应力混凝土试件的试验(包括先张、后张),并把工作侧重点放在后张
I. Overview of research work The specifications of reinforced concrete structures in major industrial countries, including China’s current TJ10-74 specifications, have not yet reached a point of perfection regarding the design and calculation methods of the pre-stretched pre-stressed concrete structures. In order to seek a more reasonable design calculation method, a series of experimental research work and theoretical research work must be conducted. Firstly, the relevant units of the special group carried out a total of 47 rectangular, T-shaped, and ⊥-shaped cross sections (width of flange (b_~’)/(b)[(b_i)/b]=2.14) in 1975–80. Tests for stress concrete specimens (including pretensioning and post-tensioning), and focusing on the work