Evaluation of shear resistance mechanism of RC liner members based on image analysis and upgrading the design method

为改进钢筋混凝土衬砌构件的抗剪设计方法，确保结构在地震作用下的安全性，采用图像分析技术研究了衬砌构件的抗剪破坏机理，建立了新的抗剪承载力预测公式。提高了现有图像分析的精度，并将其应用于纤维混凝土梁剪切裂缝裂缝面位移的测量。通过使用从单独进行的基本试验中获得的测量的裂纹表面位移和拉伸应力-裂纹张开位移关系，计算裂纹处的纤维的剪切阻力。通过建立纤维抗剪承载力与各参数的关系式，提出了一个新的抗剪承载力预测公式，该公式比现有公式具有更高的精度。

To upgrade the shear design method of reinforced concrete liner members, which is important to ensure the safety of structures in seismic events, shear failure mechanism was investigated by using the image analysis technique and a new predictive equation for shear capacity was developed. The accuracy of the existing image analysis was improved, and then it was applied to measure the crack surface displacement along the shear crack of fiber reinforced concrete beams. The shear resistance of fibers at the crack was calculated by using the measured crack surface displacement and tensile stress-crack opening displacement relationships obtained from the separately-conducted elementary tests. By formulating the shear resistance of fibers respecting to each parameter, a new predictive equation for shear capacity which has higher accuracy than that of the existing equation, was developed.