钢筋砼梁在长期荷载作用下的变形

Time-dependent Deformation of Reinforced Concrete Beams under Long-term Loading

本文对剪跨比为２．５的钢筋砼梁在长期荷载作用下的变形进行了试验研究。建立了长期弯曲变形和剪切变形计算公式，并由迭加原理得到了考虑剪切效应的钢筋砼梁在长期荷载作用下的挠度公式，计算值与试验结果吻合良好。本文公式同时考虑了砼徐变和收缩的影响，还可用来根据梁的试验结果而确定砼徐变系数和龄期调整系数值。

Experimental researches have bee.n conducted on the deformation of reinforced concrete beams under long-term concentrated loads with a shear span ratio of 2.5.The formulas for calculating time-dependent deformation due to flexure and shear have been proposed and the total time-dependent deflection is obtained by the principle of summation in consideration of the shear effect of reinforced concrete beam. Both the effects of creep and shrinkage have been taken into account in the suggested formulas and the calculation results are in good accordance with the test results.The creep coefficient and the age adjustment coefficient x can be determined by the test results of reinforced concrete beam under long-term loading.