预应力混凝土梁斜截面抗裂性和斜向主压应力

On Breaking Resistance and Oblique Major Compressive Stress upon the Oblique Cross Section of Pre-Stressed Concrete Beams

阐述现行规范主拉应力法计算预应力混凝土梁斜截面抗裂性能所存在的问题;根据370根受集中荷载和24根受均布荷载预应力混凝土和部分预应力混凝土梁试验资料,建立了上述梁的斜截面剪力抗裂计算公式,以及受集中荷载作用,不需验算主压应力的预应力混凝土梁,其跨高比限值的计算公式。

This paper describes the problems remaining in the acting criteria for the calculating the break resistane of the oblique cross section of pre-stressed concrete beams with the major tensile stress method. With the data and information of the tests made upon 370 concrete beams in concentrated load including some prestressed beams and some partial pre-stressed ones as well as 24 concrete beams in reform load in the same combination, the equations for the determination of the shearing break resistance for the oblique cross section of the abovesaid beams as well as for the determination of the rise-span ratio limit value of the pre-stress concrete beams under concentrated load without examining the major compressive stress are established in the paper.