论文部分内容阅读
通过LS-DYNA程序,二次开发了钢材和混凝土单轴弹塑性损伤本构模型,其中钢材损伤模型采用混合强化准则,可考虑材料的Bauschinger效应;混凝土损伤模型定义了拉、压两个损伤指数,能较为准确地模拟混凝土单边效应、箍筋约束效应等。结合程序中基于显示算法的纤维单元,建立了结构整体数值分析模型,并通过一个缩尺比例为1∶4的3层钢-混凝土混合结构模型振动台试验,验证了数值分析模型的分析精度,数值模拟得到了模型结构的损伤发展过程。此外提出一种通过实测应变反演应变测试部位材料的应力和损伤发展的方法,研究表明,应变反演能充分利用应变测试数据,获得材料应力和损伤发展过程,并对结构的性能退化进行评估。
Through the LS-DYNA program, the uniaxial elastic-plastic damage constitutive models of steel and concrete are developed twice. The steel damage model is based on the mixed strengthening criterion, which considers the Bauschinger effect of the material. The concrete damage model defines two damage indices , Can simulate the concrete unilateral effect, stirrup restraint effect and so on more accurately. Combined with the fiber elements based on the display algorithm in the program, a numerical model of structural integrity is established. Through a three-layer steel-concrete composite model shaking table test with a scale ratio of 1: 4, the analytical accuracy of the numerical analysis model is verified, The numerical simulation results in the damage development of the model structure. In addition, a new method of strain and strain analysis is developed to measure the stress and damage of materials by measuring the strain. The results show that the strain inversion can make full use of the strain test data to obtain the material stress and damage development process and evaluate the structural performance degradation .