大型厂房钢筋混凝土框排架结构中异型节点的抗震性能和设计方法研究  

A study on the seismic behavior of and the design method for irregular reinforced concrete frame joints of large-scale plant structures

作　　者：吴涛[1] 刘伯权[1] 白国良[2] 李红星[2] 

机构地区：[1]长安大学,陕西西安710064 [2]西安建筑科技大学,陕西西安710055

出　　处：《土木工程学报》2006年第4期1-5,19,共6页China Civil Engineering Journal

基　　金：国家电力公司"十五"科技攻关项目(60-Y2002-03-T04)

摘　　要：针对大型厂房框排架结构中通常存在变梁变柱异型节点的实际情况,进行4个1/5比例异型中节点伪静力试验研究及含有该类节点整体结构的试验,分析大小梁相对刚度、大小核心面积及小核心与柱配箍率等因素对该类节点破坏模式的影响。研究结果表明:该类节点初裂荷载、极限荷载较常规节点显著降低,通裂阶段与极限阶段非常接近,易发生小核心剪切破坏和柱端剪切破坏等两种破坏模式。采用约束机理对小核心剪切破坏进行分析并提出承载力计算方法;对于柱端剪切破坏应采用限制大梁底部纵向钢筋的方法予以避免。提出采用大小梁端弯矩比为参数区分不同类型的破坏模式,为该类异型节点合理设计提供了依据。Large-scale plants commonly involve irregular structural joints consisting of beams and columns with abrupt cross-sectional changes. Pseudo-static structural tests on four 1/5-scale specimens have been performed and the failure characteristics of these specimens were investigated. The factors affecting failure modes of irregular joints were found to be the stiffness ratio of large beam to small beam, the areas of large core and small core, and the stirrup ratios of small core and column, etc. The experimental results showed that the cracking load and the ultimate load of irregular joints obviously decrease when compared with regular joints, and that the penetrating crack load is very close to the ultimate load. Moreover, two typical failure modes may occur simultaneously, namely, they are the small core shear failure and column shear failure. A constraint mechanism method was employed to express the small core shear failure and an empirical formula for calculating shear-bearing capacity of irregular joints are is thus proposed. The steel ratio at the bottom of a large beam should be restricted to avoid possible column failure in shear. Further, the bending moment ratio of a small beam to large beam may be employed to distinguish the failure modes of irregular joints.

关 键 词：框架异型节点 抗震性能 破坏机理 设计建议 

分 类 号：TU375.3[建筑科学—结构工程]