混凝土非线性分析中的非协调参数Drucker-Prager模型

为了克服现有混凝土数值计算模型在滞回分析中的收敛困难问题,结合经典Drucker-Prager(D-P)模型的Cap修正屈服准则,提出采用非协调参数D-P模型模拟混凝土。通过数值模拟手段,经过大量试算提出了非协调参数α和k的合理取值范围。并且,采用非协调参数D-P模型分别模拟了钢筋混凝土梁在跨中单调荷载下的受力行为,以及钢筋混凝土柱和型钢混凝土柱在低周往复荷载下滞回性能,并通过与试验结果的比较验证了这个模型的有效性。利用这一特点,可通过数值计算手段获得混凝土构件在循环荷载下的恢复力模型,从而有效地节省试验资源。

An Incompatible Drucker-Prager Model Applied in Nonlinear Analysis of Concrete

To overcome the difficulty in the convergence of hysteretic analysis on numerical calculation by available models for concrete,an incompatible D-P model was proposed to simulate concrete based on the classical Drucker-Prager(D-P for short) model with modified cap yield criterion.A large amount of trial calculation was implemented to reveal the rational range of incompatible parameters α and k.The proposed model was used to simulate the mechanical behavior of a reinforced concrete specimen under monotonic load at mid-span,as well as hysteretic behavior of a reinforced concrete specimen and a steel reinforced specimen under low cyclic loading separately.By comparing with the experimental results,the adaptability of the model was verified adequately,and the restoring force model of concrete specimen under low cyclic loading could be obtained through numerical calculation.