材料非线性对钢筋混凝土高墩稳定性的影响

由于采用传统的以弹性理论为基础的设计计算方法求算高墩的内力和变形会引起较大偏差,因此考虑箍筋对核芯混凝土强度的提高作用,使用ANSYS软件分析高墩的稳定性.选用MAN-DER本构模型模拟约束混凝土的应力-应变关系,对墩高、约束指标及混凝土强度3个敏感参数进行分析,得出非线性钢筋混凝土本构关系对高墩承载力的影响规律.结果表明,考虑箍筋对混凝土的约束作用后,高墩的承载力最大可提高约50%.

Stability effect on reinforced concrete for high piers considering material non-linearity

Large deviation can be aroused when using the conventional methods, which are based on elastic theories, to evaluate internal forces and deformation of high p iers. So its stability is analyzed with ANSYS, considering the p romoting effect of stirrup s on strength of core concrete. MANDER constructive model is used to simulate stress2strain relationship of confined concrete; three sensitive parameters (p ier height, confined index and concrete strength) are analyzed and the effect rule that how non2linear con2 structive model of reinforced concrete affects load of high p ier is obtained. The result shows that the maxi2 mum increase of load is about 50% when the nonlinear constitutive relationship of confined concrete is considered in the analysis.