重庆高科太阳座大厦模型结构振动台试验研究

重庆高科太阳座大厦是一幢建筑外立面扭转，结构平面、竖向不规则超限的复杂超高层建筑结构，采用了钢管（型钢）混凝土框架-钢筋混凝土核心筒混合结构体系。外立面扭转导致外框架中竖向构件不连续，形成受力复杂的空间斜柱，进而造成结构各层平面形状、布置不断变化，以及结构扭转不规则。通过1∶25缩尺模型振动台试验，对模型结构在6度多遇、设防和罕遇地震作用下的加速度、位移等动力响应以及结构的损伤破坏情况进行观测，评价该结构体系的整体抗震性能。研究结果表明：通过增大竖向构件截面方式提高结构层高较大的楼层刚度引起了结构局部刚度突变、应力集中，致使薄弱部位转移；结构顶部塔楼的收进导致鞭梢效应明显，急剧增大了楼层变形；CFST柱-SRC梁框架的SRC梁端和节点周围加强环梁，以及RC核心筒连梁为主要损伤部位；模型在6度罕遇地震作用下能保证“大震不倒”，该结构体系具有良好的抗震性能，能够满足预设抗震性能目标。

Shaking table test on model structure of Chongqing Gaoke Sun Constellation Mansion

Chongqing Gaoke Sun Constellation Mansion is an irregular and complex super high-rise hybrid structure, which is comprised of a reinforced concrete (RC) core and an outer frame consisting of concrete filled steel tube (CFST) columns and steel reinforced concrete (SRC) beams. With a twisted shape in elevation, the outer frame has discontinuous vertical structure components, leading to out-of-plane inclined columns, which causes different plan layouts at various heights. These characteristics lead to irregularities in structural plan layout, vertical arrangement and structural torsion. To investigate the dynamic responses such as acceleration responses, displacement responses etc. of the model structure under frequent to rare earthquakes of seismic precautionary intensity six, a shaking table test on a 1∶25 scale model was conducted. The seismic performance of this complex structure system was analyzed and evaluated. The results show that strengthening the vertical structure components in the story with larger story height caused an abrupt change in local structural stiffness and stress concentration leading to the transition of weaknesses. The vertical irregularity of set-back structure causes an evident whipping effect, resulting in enlarged inter-story drift and increased torsion angles. The main damages to the model structure occur at the ends of the SRC beams, the reinforced ring beams around the connections as well as at the ends of the coupling beams of the RC core tube. The model structure experiences no collapse under rare earthquakes of seismic precautionary intensity six, and therefore has a good seismic performance meeting the seismic resistance design requirements.