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基于显式动力程序LS-DYNA数值计算平台,对其大震弹塑性时程分析的模拟方法与构件抗震性能评价方法进行研究和开发。首先在LS-DYNA材料库基础上开发了近50种复杂形式的典型截面,用于钢结构、钢筋混凝土及型钢混凝土等构件的参数化输入和纤维单元计算,经验证具有良好的计算精度。然后介绍了纤维积分单元的构件抗弯承载力误差估计和关于单元网格自动细分的子程序开发,同时介绍了钢结构构件等效初始缺陷的模拟方法。为合理且直观地评价结构构件的延性与塑性变形,建立了类似于美国ASCE 41-06的延性评价方法,并开发了有关程序。最后简单介绍了从模型接口到数据后处理的各项程序开发工作,以及已经完成的工程应用情况。经验证该数值方法具有合适的工程精度和高效的计算能力。
Based on the explicit dynamic program LS-DYNA numerical calculation platform, the simulation method of the elastic-plastic time-history analysis of the large-scale earthquake and the method of evaluating the seismic performance of the member are researched and developed. First of all, based on the LS-DYNA material library, nearly 50 typical cross sections of complex forms were developed for the parametric input and fiber unit calculation of steel structures, reinforced concrete and steel reinforced concrete, which have been proved to have good calculation accuracy. Then, the error estimation of flexural capacity of fiber integral element and the subroutine development of automatic meshing of element grid are introduced. At the same time, the simulation method of equivalent initial defect of steel structural element is introduced. In order to evaluate the ductility and plastic deformation of structural members reasonably and intuitively, a ductility evaluation method similar to ASCE 41-06 was established and the relevant procedures were developed. Finally, it briefly introduces the development of various programs from the model interface to the data post-processing as well as the engineering application that has been completed. The numerical method has been verified to have suitable engineering accuracy and high computational power.