钢筋混凝土矩形梁正截面承载能力计算研究

Study on Calculation of Bearing Capacity of Normal Section of Rein⁃forced Concrete Rectangular Beams

基于实测材料参数,分别利用规范所述方法和曲线积分法计算混凝土矩形梁正截面抗弯承载能力。使用规范方法计算时材料参数取设计值、将混凝土应力—应变关系曲线等效为矩形。积分法则是根据混凝土应力—应变关系曲线模型,基于曲线积分,推导出计算公式。将两种计算方法与试验实测结果对比发现:按规范计算出的结果偏于保守,若取用实测强度,则更贴近实际情况;材料参数取实测强度后,两种计算方法与试验结果吻合程度高。

Based on the measured material parameters,the method described in the specification and the curve integral method were used to calculate the flexural bearing capacity of the normal section of the concrete rectangular beam.When using the normative method,the material parameters are taken as design values,and the concrete stress-strain relationship curve is equivalent to a rectangle.The integral rule is to derive the cal⁃culation formula based on the curve integral of the concrete stress-strain relation curve model.Comparing the two calculation methods with the test results,it is found that:the results calculated according to the specifica⁃tion are conservative,and if the measured strength is used,it is closer to the actual situation;after the material parameters are the measured strength,the two calculation methods are consistent with the test results high.