某L形平面多次退台超限结构分析研究

Analysis and design of a L-shaped out-of-code structure with repeated plane retractions

某办公楼为抗震设防烈度7度(0.1g)区L形平面多次退台框架-剪力墙超限高层建筑,其性能目标为C。对此L形平面办公楼的有退台与无退台结构进行了对比研究,两者的扭转及振动特性完全不一致,对控制该办公楼的扭转提出了一些建议。本办公楼为较矮高层且核心筒集中布置的框架-剪力墙结构,对此类结构设计时遇到的重难点问题(大面积墙受拉、受剪等)进行了分析研究,并提出了优化墙体布置、增加型钢等应对措施。针对L形平面多次退台结构的收进判断,提供了一个可以参考的做法。同时在抗震设计中采用性能化设计方法,并借助各种软件进行计算和验证,以达到规范所提出的相关抗震设防要求。

An office building is a L-shaped out-of-code high-rise building with repeated plane retractions in seismic fortification intensity zone of 7 degrees(0.1g),and its performance target is C.A comparative study was carried out on this L-shaped structure with retractions and without retractions,their torsion and vibration characteristics are completely in consistent,and some suggestions for their torsion control were put forward.This office building is a short high-rise frameshear wall structure with core tubes centrally arranged.The key and difficult problems(tension and shear resistance of most walls)encountered in the design of similar structures were analyzed and studied,and the corresponding measures which optimize wall layout and increase section steel were put forward.A reference method was provided for judging the retraction of L-shaped structure with repeated plane retractions.At the same time,the performance-based design method was adopted in the seismic design,and the calculation and verification were carried out with the help of various software,so as to meet the relevant seismic fortification requirements proposed in the code.