中文摘要：

通过大量试验,测得了混凝土在单轴应力状态及在5种不同应力比下的双轴应力状态的应力-应变关系。论述了Jones-Nel-son-Morgan模型的构成原理及其参数的确定方法,首次将这个模型,用于混凝土材料的本构关系分析,结合混凝土的单轴试验结果,建立了混凝土的非线性本构模型,该模型的特点是材料的力学性能只为应变能的函数,使材料模型可以方便地应用于复杂应力状态。利用广义虎克定律,将模型推广应用于混凝土双轴应力状态的本构关系分析,获得了与试验结果符合较好的理论模型。

英文摘要：

The stress-strain relationship of concrete subjected uni-axial stress and bia-axial stress with five kinds of different stress ratio respectively was abtained through large number of tests in this paper.The constituting principle and determining method for Jones-Nelson-Morgan model was stated.It was the first time to apply the model to the analysis of constitutive model relationship for concrete material.Combining the uni-axial test results for concrete,the nonlinear constitutive model for concrete was built.The characteristic of the model is that the mechanics property of material is only the function of strain energy.Due to the method,the model can be used in analysis of complex stress state easily.Using general defined Huke law,the model can be spread to the constitutive model analysis of concrete under bia-axial stress state.The theory model conforms to tests results well.