基于位移的RC框架结构粘纤维布抗震加固分析

针对RC框架结构的抗震加固,以结构层间位移角为量化的性能目标,采用粘纤维布的加固方法,利用有限元软件,用Pushover分析法对加固后的RC框架结构进行了基于位移的抗震性能分析。结果表明,提出的基于位移的抗震加固分析的方法与步骤,以层间位移角为性能目标的量化方法,可以较好地评估加固后结构的抗震性能,能够有效地控制结构的变形,将加固后结构的抗震性能控制在预先设定的目标之内;采用芳纶纤维布加固后的结构能够满足结构抗震性能目标,且加固后结构在推至相应的设防水平时能够形成梁铰机制,是一种行之有效的结构抗震性能加固方法。

Study on Improvement of Seismic Performance of Transmission Tower Using Viscous Damper

The earthquake resistance of transmission tower has been often discussed from the viewpoint of reinforcing the foundation of steel tower, but there are also few studies considering the damping characteristics of the tower. This paper focuses on the viscous damper which has been adopted for seismic reinforcement of bridges in recent years. The purpose of this study is to improve the seismic performance of steel tower by giving the high damping to the tower. We construct a single tower model considering the influence of transmission line, and then simulate the vibration characteristics and seismic behavior of the tower by the eigenvalue analysis and the dynamic response analysis. The results show that the transmission tower with viscous damper can reduce its own response effectively and drastically. This research concludes that it is necessary to consider the extreme increase of steel tower＇s response depending on the seismic wave and the collapse of steel tower can be avoided by using the optimum damper in the design of the transmission tower.