某三塔多位L形大跨连体高层建筑结构抗震超限设计

Seismic out-of-code design of a multi-position L-shaped large-span conjoined high-rise building with three towers

陕西燃气产业研发与孵化基地AB座办公楼标准层为呈L形布置的3个塔楼,通过5处连接体连为一个整体,有2处连接体楼层错位交叉布置,平面凹凸尺寸达到72%,存在凹凸不规则,楼板不连续,局部不规则、连体等4项不规则,属于大跨度复杂连体高层结构。连接体与主体结构均采用刚性连接方案。对抗震超限设计中的抗震超限分析的设防参数、性能目标、计算参数、加强措施等问题进行探讨,对多遇地震作用下的振动形态、罕遇地震作用弹塑性静力推覆分析和楼板应力分析等进行介绍,并对连体结构建模分析存在的问题进行研究。结果表明:整体结构刚度布置合理、振动形态好;罕遇地震作用下,核心筒外围底部剪力墙首先破坏,剪力墙整体破坏程度明显高于框架破坏程度;核心筒附近楼板应力集中现象较为明显;高阶振型中,存在非连接体楼层塔楼各自振动的形态,对各项统计指标均存在一定的影响。

Shaanxi Gas Industry R&D and Incubation Base AB office building standard floor is 3 towers arranged in an L shape, connected as a whole by 5 connectors. Two connectors are arranged in a staggered and crossed floor, and the plane concave and convex size reaches 72%. There are four irregularities, including uneven irregularities, discontinuous floor slabs, local irregularities, and conjoined pieces, which belong to a large-span complex conjoined high-rise structure. Both the connector and the main structure adopt a rigid connection scheme. The fortification parameters, performance objectives, calculation parameters, strengthening measures and other issues of the seismic out-of-code analysis in the seismic out-of-code design were discussed. The vibration pattern under the action of frequent earthquakes, the elastoplastic static pushover analysis under the action of rare earthquakes and the floor stress analysis were introduced. And the problems existing in the modeling and analysis of the connected structure were studied. The results show that: the overall structural stiffness is reasonable and the vibration pattern is good. Under the action of rare earthquake, the shear wall at the bottom of the core tube is first damaged, and the overall damage degree of the shear wall is significantly higher than that of the frame. The stress concentration phenomenon of the floor near the core tube is relatively high obviously. In the high-order mode shapes, there are different vibration forms of the towers of the non-connector floors, which have a certain impact on various statistical indicators.