混凝土非线性分析中的非协调参数Drucker-Prager模型

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

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。

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 modi- fied cap yield criterion. A large amount of trial calculation was implemented to reveal the rational range of incompatible parameters＇ （~ 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 specimert under low cyclic loading sep- arately. By comparing with the experimental resuhs, the adaptability of the model was verified adequately, and the restoring force mod- el of concrete specimen under low cyclic loading could be obtained through numerical calculation.