采用普通伸臂桁架和BRB伸臂桁架的高层建筑耗能机制对比
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摘要
伸臂桁架是高层建筑中的重要抗侧力构件,其耗能能力对结构抗震性能有着重要影响。普通伸臂桁架由于斜腹杆屈曲导致耗能能力存在不足,而将普通伸臂桁架的斜腹杆改为防屈曲支撑(BRB)则可以有效提高其耗能能力。以一高度为230.9m的高层建筑为工程背景,通过弹塑性时程分析,对比采用普通伸臂桁架和BRB伸臂桁架的高层建筑耗能机制。研究表明:BRB伸臂桁架较普通伸臂桁架具有更好的变形能力和耗能能力;结构采用不同的伸臂桁架会对其在地震作用下的地震能量输入和耗能分布产生一定影响;不同的伸臂桁架不仅影响其本身所占塑性耗能百分比,同时对结构中其他构件耗能贡献也有影响,并对主要塑性耗能单元——剪力墙影响显著。
Outriggers are important lateral force resisting members in high-rise buildings, and their energy dissipation capacity has a significant impact on structural seismic performance. Since ordinary outriggers have insufficient energy dissipation capacity due to the buckling of diagonal web members, the energy dissipation capacity can be effectively improved if its diagonal web members are replaced by buckling restrained brace(BRB). Based on a high-rise building with a height of 230.9 m, the energy dissipation mechanism of the high-rise building was compared by using ordinary outriggers and BRB outriggers through nonlinear time-history analysis. The research indicates that the deformation and energy dissipation capacity of BRB outriggers are better than the ordinary outriggers; different outriggers in structures have some impact on the seismic energy input and energy distribution; different outriggers affect its own percentage share of plastic energy dissipation, and at the same time, they also have an impact on the energy dissipation contribution of other members in the structure, especially having a significant impact on the shear wall, which is the main plastic energy dissipation unit.
Outriggers are important lateral force resisting members in high-rise buildings, and their energy dissipation capacity has a significant impact on structural seismic performance. Since ordinary outriggers have insufficient energy dissipation capacity due to the buckling of diagonal web members, the energy dissipation capacity can be effectively improved if its diagonal web members are replaced by buckling restrained brace(BRB). Based on a high-rise building with a height of 230.9 m, the energy dissipation mechanism of the high-rise building was compared by using ordinary outriggers and BRB outriggers through nonlinear time-history analysis. The research indicates that the deformation and energy dissipation capacity of BRB outriggers are better than the ordinary outriggers; different outriggers in structures have some impact on the seismic energy input and energy distribution; different outriggers affect its own percentage share of plastic energy dissipation, and at the same time, they also have an impact on the energy dissipation contribution of other members in the structure, especially having a significant impact on the shear wall, which is the main plastic energy dissipation unit.
引文
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[3] 丁洁民, 巢斯, 赵昕, 等. 上海中心大厦结构分析中若干关键问题[J]. 建筑结构学报, 2010, 31(6): 122-131.
[4] 傅学怡, 吴国勤, 黄用军, 等. 平安金融中心结构设计研究综述[J]. 建筑结构, 2012, 42(4): 21-27.
[5] 赵静. 超限复杂高层武汉中心的结构抗震分析[J]. 结构工程师, 2012, 28(2): 66-73.
[6] 周健, 陈锴, 张一锋, 等. 武汉中心塔楼结构设计[J]. 建筑结构, 2012, 42(5): 8-12.
[7] NANDURI PMBRK, SURESH B, HUSSAIN MI. Optimum position of outrigger system for high-rise reinforced concrete buildings under wind and earthquake loadings[J]. American Journal of Engineering Research, 2013, 2(8): 76-89.
[8] KAMATH K, DIVYA N, RAO A U. A study on static and dynamic behavior of outrigger structural system for tall buildings[J]. Bonfring International Journal of Industrial Engineering and Management Science, 2012, 2(4): 15-20.
[9] 刘畅, 黄用军, 何远明. 伸臂桁架工作性能研究和设计建议[J]. 建筑结构, 2013, 43(9): 57-61.
[10] 陆新征, 卢啸, 李梦珂, 等. 上海中心大厦结构抗震分析简化模型及地震耗能分析[J]. 建筑结构学报, 2013, 34(7): 1-10.
[11] SMITH B S, SALIM I. Parameter study of outrigger-braced tall building structures[J]. Journal of the Structure Division, ASCE, 1981, 107(10): 2001-2014.
[12] WILSON E L, YUAN M W, DICKENS J M. Dynamic analysis by direct superposition of Ritz vectors[J]. Earthquake Engineering & Structure Dynamics, 1982, 10(6): 813-823.
[13] ZEIDABADI N A, MIRTALAE K, MOBASHER B. Optimized use of the outrigger system to stiffen the coupled shear walls in tall buildings[J]. The Structural Design of Tall and Special Buildings, 2004, 13(1): 9-27.
[14] 杨青顺, 甄伟, 解琳琳, 等. 耗能伸臂桁架抗震性能的试验研究[J]. 工程力学, 2016, 33(10): 76-85.
[15] 陆文忠, 吕西林. 武汉人信汇高位裙房双塔超限高层抗震分析和性能化设计[J]. 建筑结构, 2016, 46(6): 12-19.
[16] Prestanard and commentary for the seismic rehabilitation of buildings:FEMA 356[S]. Washington D. C.:Federal Emergency Management Agency, 2000.
[17] 陆新征, 蒋庆, 缪志伟, 等. 建筑抗震弹塑性分析[M]. 北京: 中国建筑工业出版社, 2015: 32-63.
[18] 建筑抗震设计规范:GB 50011—2010[S].北京:中国建筑工业出版社,2010.