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钢混结构分离式有限元建模方法由于考虑了钢筋的实际分布,其计算精度较高,但建模过程复杂繁琐。开展了基于动刚度等效的钢混结构简化建模研究,该方法将钢筋和混凝土考虑为一种等效材料。研究中首先以典型钢混组合结构为例,以等效模型与分离式模型的模态特性等效为目标,建立了分部件的动刚度等效模型,然后将各部件等效模型组合成整体结构等效模型,数值仿真结果显示在相同载荷作用下,整体参考模型与整体等效模型的响应分布非常接近,而等效模型的规模远小于参考模型,说明了该等效建模方式的有效性。进一步将该等效建模方法应用于神光Ⅲ主机靶室钢混结构的动力学分析中,并计算了该巨型光机结构等效模型在实测基础加速度激励下的随机振动响应,靶球上各方向的响应实测结果与计算结果较为吻合。所采用的动刚度等效建模方法可应用在巨型光机结构动力学稳定性的进一步研究中。
Because of considering the actual distribution of steel bar and its calculation precision, the modeling method of separated finite element of steel-concrete structure is complicated and complicated. A simplified modeling of steel mixing structure based on dynamic stiffness is carried out. This method considers reinforced concrete and concrete as an equivalent material. Taking the typical steel-concrete composite structure as an example, aiming at the equivalence of equivalent modal and discrete model’s modal characteristics, the dynamic stiffness equivalent model of the sub-part is established. Then, the equivalent models of each part are combined into a whole Structure equivalent model. The numerical simulation results show that under the same load, the overall reference model is very close to the overall equivalent model, while the equivalent model is much smaller than the reference model, indicating that the equivalent modeling method is effective Sex. The equivalent modeling method is further applied to the dynamic analysis of the steel-concrete structure of SG-III target chamber, and the random vibration response of the equivalent model of the structure is calculated. The measured results in all directions are in good agreement with the calculated results. The dynamic stiffness equivalent modeling method adopted can be applied in the further study of the dynamic stability of giant optical mechanism.