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钢筋混凝土(预应力混凝土)的压(拉)——弯构件在极限状态下的强度计算历来有两种方法,一是苏联提出的,以三条基本假定为基础的简化公式,分别按五种受力情况建立各种杆件的计算公式。如我国“公路预应力混凝土桥梁规范”及“钢筋混凝土结构设计规范——TJ10—74”均属于此范畴。近年来,国内外有关的科研报告相继指出了这三条假定是有问题的。另一种就是目前欧美多数国家及国际预应力协会采用的方法,此法是根据截面的内力平衡条件及应力——应变的关系建立的,并且也是可适用于各种受力情况的通用计算方法。本文就是按后一种方法的思路整理出较符合实际的计算公式,不再采用以上的三条假定,而与欧美的通用公式相比,还略去了一些次要因素,并不影响计算精度。计算方法较易掌握。
The compression (pulling) of reinforced concrete (prestressed concrete)—the strength calculation of curved members in the limit state has historically been of two methods. First, the simplified formula based on three basic assumptions proposed by the Soviet Union, according to the five types, respectively. The force condition establishes the calculation formula for various rods. Such as China “road prestressed concrete bridge specification” and “reinforced concrete structure design specification - TJ10-74 ” belong to this category. In recent years, relevant research reports at home and abroad have pointed out that these three assumptions are problematic. The other method is currently used by most countries in Europe and the United States and the International Prestressing Association. This method is based on the internal force balance conditions of the cross section and the stress-strain relationship, and it is also a general calculation method that can be applied to various stress conditions. . This article is based on the idea of the latter method to sort out a more practical calculation formula, no longer using the above three assumptions, but compared with the European and American general formula, also omitted some secondary factors, does not affect the calculation accuracy. The calculation method is easier to grasp.