新型装配式钢管混凝土柱-钢筋混凝土梁框撑体系振动台试验研究

结合装配式建筑和钢管混凝土柱-钢筋混凝土梁组合框架结构的优点,提出新型装配式方钢管混凝土柱-钢筋混凝土梁组合框撑体系。为研究该类新型体系的整体抗震性能,设计制作了缩尺比为1/3的6层整体模型,对该模型输入了《建筑抗震设计规范》(GB 50011—2010)所建议的多种烈度下的地震激励,获得了其在相应地震激励作用下的结构响应及破坏形态,分析研究了其整体抗震性能、结构失效路径以及连接节点的可靠性。研究表明：①该类结构体系具有“强钢管混凝土柱-弱钢筋混凝土梁”及“强节点-弱构件”的理想失效路径;②梁的破坏点位于工字型钢接头梁段与钢筋混凝土梁段交界位置,距梁柱节点核心区域有一定距离,从而保证了节点核心区域的完整性;③结构部分楼层在强震下会因斜撑失效而形成薄弱层,造成结构响应的放大。

Shake table test on a new type of precast CFST column-RC beam braced frame structure

By combining the advantages of precast buildings with the advantages of concrete filled steel tubular (CFST) column-reinforced concrete (RC) beam braced frames, a new type of precast CFST column-RC beam braced frame structure with welded and bolted steel connections is proposed. In a series of shake table tests with a variety of earthquake intensities, a 1∶3 scale 6-story model was excited for investigating the structural dynamic response, failure pattern, global seismic performance, structural failure path and reliability of connection joints of this type of structure. The study shows that: ① This type of structure exhibits “strong CFST column-weak RC beam” and“strong connection-weak member” failure mechanisms; ② Damages generally occur at the interface between the reinforced concrete beam segment and the I-section steel girder segment with a considerable distance to the core area of the beam- column joint, so that the integrity of the core area of beam-column joint can be ensured; ③ Due to the failure of braces under strong earthquake action, a few floors can be transformed into weak stories, leading to the amplification of the structural dynamic response.