某L形单向少墙超限高层建筑结构抗震性能分析

Seismic performance analysis of an L-shaped high-rise building with one-way few walls

结合某L形单向少墙超限高层结构,首先分析了结构在小震和风荷载作用下的各项指标,并考虑连接区域楼板变形对结构指标的影响;其次将L形主结构拆分成两个子结构,重点通过连接处楼板应力分析得出单向少墙子结构之间的受力机理;再次对本项目平面超长结构进行了温度应力分析;最后提出了此类结构的设计加强措施,同时采用大震弹塑性时程分析方法检验结构薄弱层层间塑性位移角。分析结果表明:L形体型的两单向少墙子结构在地震作用下,受力类似于“框架-剪力墙”结构受力模式,在底部楼层相互作用较大;对于凹凸不规则超高层建筑带出单肢结构长宽比较大时,应复核连接区域楼板变形对结构层间位移角影响。

The Based on the L-shaped one-way high-rise structure with few walls, Firstly, this paper analyzes indexes of structures under small earthquakes and wind loads,And consider the influence of floor deformation on the structural indexes;Secondly, split the L-shaped main structure into two sub-structures, through the stress analysis of the joint floor,the stress mechanism between one direction and fewer walls is obtained;Thirdly, the temperature stress analysis of super long structure is carried out;Finally, the design and strengthening measures for such structures are put forward;At the same time, the elastoplastic time history analysis is adopted to review the plastic displacement angle between the weak layers of the structure;The results indicate that, The stress of L-shaped two one-way few wall substructure under earthquake is similar to the stress mode of "frame shear wall" structure, and the interaction is large at the bottom floor.When the length width ratio of the single leg structure brought out by the concave convex irregular super high-rise building is large, the influence of the floor deformation in the connection area on the inter story displacement angle of the structure should be rechecked.