屈曲约束支撑在火力电厂主厂房钢筋混凝土框排架结构中的应用研究

APPLICATION OF BUCKLING-RESTRAINED BRACES( BRB) IN RC FRAME-BENT MAIN BUILDING STRUCTURE FOR LARGE THERMAL POWER PLANTS

在钢筋混凝土框排架结构中引入新的耗能构件——屈曲约束支撑(BRB),以使8度抗震设防地区电力主厂房有一种新的可选结构体系。以某实际工程为背景,按照8度Ⅱ类场地采用屈曲约束支撑-钢筋混凝土框排架结构方案进行了设计。采用非线性分析软件Perform 3D,建立了含支撑和不含支撑的有限元模型,进行了大震下弹塑性时程分析。结果表明,采用了BRB以后,可以消耗大量原本由柱消耗的能量,从而避免底部发生薄弱层破坏,满足大震不倒的抗震设计要求,是一种性能优越的抗震结构体系。

Buckling-restrained brace （ BRB） is introduced in the reinforced concrete frame-bent structure in order to provide a new solution to large thermal power plants in seismic region of intensity 8.Based on an actual project , a sample design of BRB-frame-bent system was developed considering site condition 2 with seismic intensity 8.Two finite element models with and without BRBs were established with nonlinear analytical software Perform 3D and elasto-plastic time history analyses under rare earthquakes were performed .Analytical results showed that BRBs dissipated a large amount of seismic energy , which would otherwise mostly suffered by columns , and thus the damage to bottom weak floor could be avoided , ensuring the safety of the structure under rare earthquakes and qualifying a superior seismic resistant structural system .