建筑结构的分布式阻尼减震方法

Vibrating control of building using distributed damping

提出一种新的阻尼减震方法:在建筑结构的主要构件中配置低屈服点钢材,如在钢筋混凝土梁柱中埋置低屈服点钢筋,或在型钢梁柱的翼缘上焊接低屈服点钢板,这些钢材将在构件发生预期变形时屈服耗能.由于这些低屈服点钢材可分布于所有构件之中,所以称之为“分布式”.对设置阻尼钢板的型钢柱的滞回性能进行分析,结果表明阻尼钢板可有效提高构件的等效阻尼比;然后,通过一个设置分布阻尼的剪切型结构的非线性地震响应算例,初步验证了该方法的可行性.与目前常见的各种阻尼器相比,分布式阻尼减震方法不占用建筑物使用空间,施工简单,服役期间无需特殊的检查与维修,是一种更适合在建筑工程中广泛推广的减震技术.

A novel method to improve the damping capacity of buildings is presented by adding some low yield point steel into structural members, for example, to place low yield point rebar in reinforced concrete columns or beams, or to weld low yield point plates onto flange of steel columns or beams. Plastic deformation would occur in these special steel when anticipative deformation takes place displaced in structural members, thus some energy introduced into buildings by earthquake could be dissipated. Since these steel can be distributed in most structural members, they are also called “distributed damping steel”. The hysteretic performance of an H steel column equipped with low yield steel was discussed. The results indicate that the distributed damping plate can effectively enhance the damping ratio of this column. Besides, the seismic performance of a shear resistant frame damped by distributed damping steel was investigated. The results prove this damping approach. Compared to dampers currently used in buildings, the method presented has no extra demand of space to install, it is easy to construct and has no special requirement of inspection and maintenance. Therefore this method is more suitable to be applied to building structures.