Ansys中砼单元Solid65的裂缝间剪力传递系数取值

结合22根钢筋混凝土简支梁弯剪-轴拉极限承载力试验实测结果和有限元分析结果,对Ansys中混凝土单元Solid65的裂缝间剪力传递系数的取值范围及其对计算结果的影响进行了较为全面的研究.研究中考虑了梁体预拉裂、轴向拉力大小、配筋率、混凝土强度等级等因素的影响.研究结果表明,Solid65的裂缝间剪力传递系数对有限元分析结果影响较大,当开口裂缝的剪力传递系数C1=0.35~0.40,闭合裂缝的剪力传递系数C2=0.9~1.0时,有限元的计算结果与试验实测结果吻合较好.这一结论可用于钢筋混凝土梁受力的有限元分析.

Values of shear transfer coefficients of concrete element Solid65 in Ansys

Combined with the results in the ultimate strength tests of 22 reinforced concrete of simply supported beams under bending moment,shear force,axial tensile force and the FEA results,the range of values of the shear transfer coefficients for open and close cracks and their influences on the calculation results were studied.In the study,the pre-crack of beams,the axial tensile force,the reinforcement ratio and the concrete strength grade were considered.The result reveals that the shear transfer coefficients for open and close cracks of Solid65 have large influences on the FEA results.When the shear transfer coefficients for open crack C1=0.35~0.40 and the shear transfer coefficients for close crack C2=0.9~1.0,the FEA results show good coincidence with the tests results.This conclusion can be used in FEA of reinforced concrete beams.