高阻尼混凝土梁板结构动力特性分析

Dynamic Property Analysis of High Damping Concrete Beam-Slab Structures

通过提高混凝土材料的阻尼比,有效地改善混凝土结构自身的阻尼性能,从材料的角度出发实现结构高阻尼化已成为一种新的结构振动控制方法。根据结构动力学原理,分析了提高系统阻尼比在结构发生共振时,对降低结构振动响应的有效性;利用有限元软件AN SY S模拟了普通混凝土结构、局部高阻尼混凝土结构以及整体高阻尼混凝土结构的动力响应,主要包括模态分析和谐响应分析,并对3种不同组成材料的结构响应结果进行比较。有限元分析表明:高阻尼混凝土结构的动力特性较普通混凝土结构有了显著的改善,而且当高阻尼混凝土仅用于结构的柱中时,其改善效果与整体结构都与使用高阻尼混凝土的效果比较接近。这对研究结构局部高阻尼化,降低结构在地震等动荷载作用下的响应有参考价值。

Increasing the damping ratio of materials to improve the damping property of concrete structure effectively and embodying the structural high damping has been a new way for structural vibration controlling. Based on the structural dynamics principle, the validity of improving the damping property for decreasing the vibration response was analyzed when the structures resonate. The dynamic responses of the normal concrete structure, local high damping concrete structure and entire high damping concrete structure were simulated by using ANSYS. The analysis included modal analysis and harmonic analysis, and the response results were compared. The results of analysis show that the dynamic property of the high damping concrete structure is improved, compared with that of the normal concrete structure. However, when the high damping concrete is only used in the columns of the structure, the results are close to that of entire high damping concrete structure. This study will be of reference value to design appropriate type of high damping concrete in civil engineering.