预估钢框筒截面尺寸的等效实膜筒法的改进
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摘要
等效实膜筒法较适合预估低烈度区钢框筒结构的构件尺寸,但当设防烈度较高时,预估出的构件尺寸偏小,需多次调整方可满足规范要求。针对该问题,提出了基于多遇地震作用下最大层间位移角与风荷载下最大层间位移角相等时多遇地震作用的相当风压概念,建议求顶点侧移时取相当风压与基本风压的较大值,可用《建筑抗震设计规范》中底部剪力法计算基底剪力的公式来估计相当风压下的基底剪力,通过多种影响因素分析验证了其可行性;此外在对多个钢框筒算例分析的基础上建议用等效实膜筒法时风荷载下的顶点侧移角限值可保守取1/450;最后用一个30层钢框筒算例验证了改进方法的有效性。改进后的等效实膜筒法对处于不同抗震设防区的钢框筒结构的构件尺寸预估均有较好的适用性。
The equivalent membrane tube method is more suitable for estimating section dimension of steel framed-tube structure in low seismic intensity region.However,when the fortification intensity is high,component size estimated is relatively small,and it needs to be adjusted to meet requirements of specification for several times.In order to solve this problem,this paper proposes a concept of equivalent wind pressure of frequent earthquake based on the concept that the maximum inter-story drift under frequent earthquake is equal to that under wind load.It is suggested the vertex lateral displacement is determined by larger value of equivalent wind pressure and actual basic wind pressure.The base force under equivalent wind pressure is estimated by the formula of base force method fromCode for Seismic Design of Buildings.The feasibility of estimation is confirmed by the analysis of various influencing factors.It is recommended that vertex lateral drift under wind load takes 1/450 conservatively with the help of analysis of several steel framed-tube structures.Finally,the effectiveness of the improved method is validated by a 30-storey steel framedtube example.The improved method has good applicability on the estimation of dimension of steel framed-tube structure in different seismic fortification region.
The equivalent membrane tube method is more suitable for estimating section dimension of steel framed-tube structure in low seismic intensity region.However,when the fortification intensity is high,component size estimated is relatively small,and it needs to be adjusted to meet requirements of specification for several times.In order to solve this problem,this paper proposes a concept of equivalent wind pressure of frequent earthquake based on the concept that the maximum inter-story drift under frequent earthquake is equal to that under wind load.It is suggested the vertex lateral displacement is determined by larger value of equivalent wind pressure and actual basic wind pressure.The base force under equivalent wind pressure is estimated by the formula of base force method fromCode for Seismic Design of Buildings.The feasibility of estimation is confirmed by the analysis of various influencing factors.It is recommended that vertex lateral drift under wind load takes 1/450 conservatively with the help of analysis of several steel framed-tube structures.Finally,the effectiveness of the improved method is validated by a 30-storey steel framedtube example.The improved method has good applicability on the estimation of dimension of steel framed-tube structure in different seismic fortification region.
引文
[1]曹希尧,李家宝,李存权.框筒结构两种典型简化分析方法的综合比较[J].湖南大学学报(自然科学版),1997,24(1):87-92.CAO Xiyao,LI Jiabao,LI Cunquan.Comparison of two typical simplified analysis methods for frame tube structures[J].Journal of Hunan University(Natural Sciences),1997,24(1):87-92.(in Chinese)
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[3]雷淑忠,沈祖炎,刘振华.超高层钢框筒结构体系截面尺寸的初步确定[J].建筑结构,2005,35(6):20-22.DOI:10.19701/j.jzjg.2005.06.006.LEI Shuzhong,SHEN Zuyan,LIU Zhenhua.Determination of section dimension for super-rise steel frame-tube structure in the preliminary design stage[J].Building Structure,2005,35(6):20-22.DOI:10.19701/j.jzjg.2005.06.006.(in Chinese)
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[9]孙爱伏,欧进萍.高层钢结构抗震pushover分析的侧向力分布模式及其影响[J].地震工程与工程振动,2008,28(4):88-93.DOI:10.13197/j.eeev.2008.04.012.SUN Aifu,OU Jinping.Lateral action patterns and their effects on pushover seismic analysis of steel tall buildings[J].Earthquake Engineering and Engineering Vibration,2008,28(4):88-93.DOI:10.13197/j.eeev.2008.04.012.(in Chinese)
[10]缪志伟,马千里,叶列平,等.Pushover方法的准确性和适用性研究[J].工程抗震与加固改造,2008,30(1):55-59.DOI:10.16226/j.issn.1002-8412.2008.01.011.MIAO Zhiwei,MA Qianli,YE Lieping,et al.Study on the accuracy and applicability of the Pushover Analysis[J].Earthquake resistant engineering and retrofitting,2008,30(1):55-59.DOI:10.16226/j.issn.1002-8412.2008.01.011.(in Chinese)
[11]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89-97.DOI:10.13197/j.eeev.2004.03.012.HOU Shuang,OU Jinping.A study of load pattern selection of pushover analysis and influence of higher modes[J].Earthquake Engineering and Engineering Vibration,2004,24(3):89-97.DOI:10.13197/j.eeev.2004.03.012.(in Chinese)
[12]席攀,沈之容.Pushover分析中侧向力分布模式对结果的影响[J].佳木斯大学学报(自然科学版),2013,31(2):214-217.XI Pan,SHEN Zhirong.The influences of lateral load patterns on result of pushover analysis[J].Journal of Jiamusi University(Natural Science Edition),2013,31(2):214-217.(in Chinese)
[2]迟文喜.高层建筑结构体系选择与截面预估[J].世界地震工程,1995(4):47-54.CHI Wenxi.Selection and section estimation of high-rise building structure system[J].World Earthquake Engineering,1995(4):47-54.(in Chinese)
[3]雷淑忠,沈祖炎,刘振华.超高层钢框筒结构体系截面尺寸的初步确定[J].建筑结构,2005,35(6):20-22.DOI:10.19701/j.jzjg.2005.06.006.LEI Shuzhong,SHEN Zuyan,LIU Zhenhua.Determination of section dimension for super-rise steel frame-tube structure in the preliminary design stage[J].Building Structure,2005,35(6):20-22.DOI:10.19701/j.jzjg.2005.06.006.(in Chinese)
[4]中国人民共和国住房和城乡建设部.高层民用建筑钢结构技术规程:JGJ 99-98[S].北京:中国建筑工业出版社,1998.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Technical Specification for Steel Structure of Tall Building:JGJ 99-98[S].Beijing:China Architecture&Building Press,1998.(in Chinese)
[5]中国人民共和国住房和城乡建设部.高层民用建筑钢结构技术规程:JGJ 99-2015[S].北京:中国建筑工业出版社,2015.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Technical Specification for Steel Structure of Tall Building:JGJ 99-2015[S].Beijing:China Architecture&Building Press,2015.(in Chinese)
[6]中国人民共和国住房和城乡建设部.建筑结构荷载规范:GB50009-2012[S].北京:中国建筑工业出版社,2012.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Load Code for the Design of Building Structures:GB 50009-2012[S].Beijing:China Architecture&Building Press,2012.(in Chinese)
[7]傅学怡.实用高层建筑结构设计:第2版[M].北京:中国建筑工业出版社,2010:102-108.FU Xueyi.Applied structural design of tall building:The second edition[M].Beijing:China Architecture&Building Press,2010:102-108.(in Chinese)
[8]中国人民共和国住房和城乡建设部.建筑抗震设计规范:GB50011-2010[S].北京:中国建筑工业出版社,2010.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Code for Seismic Design of Buildings:GB 50011-2010[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[9]孙爱伏,欧进萍.高层钢结构抗震pushover分析的侧向力分布模式及其影响[J].地震工程与工程振动,2008,28(4):88-93.DOI:10.13197/j.eeev.2008.04.012.SUN Aifu,OU Jinping.Lateral action patterns and their effects on pushover seismic analysis of steel tall buildings[J].Earthquake Engineering and Engineering Vibration,2008,28(4):88-93.DOI:10.13197/j.eeev.2008.04.012.(in Chinese)
[10]缪志伟,马千里,叶列平,等.Pushover方法的准确性和适用性研究[J].工程抗震与加固改造,2008,30(1):55-59.DOI:10.16226/j.issn.1002-8412.2008.01.011.MIAO Zhiwei,MA Qianli,YE Lieping,et al.Study on the accuracy and applicability of the Pushover Analysis[J].Earthquake resistant engineering and retrofitting,2008,30(1):55-59.DOI:10.16226/j.issn.1002-8412.2008.01.011.(in Chinese)
[11]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89-97.DOI:10.13197/j.eeev.2004.03.012.HOU Shuang,OU Jinping.A study of load pattern selection of pushover analysis and influence of higher modes[J].Earthquake Engineering and Engineering Vibration,2004,24(3):89-97.DOI:10.13197/j.eeev.2004.03.012.(in Chinese)
[12]席攀,沈之容.Pushover分析中侧向力分布模式对结果的影响[J].佳木斯大学学报(自然科学版),2013,31(2):214-217.XI Pan,SHEN Zhirong.The influences of lateral load patterns on result of pushover analysis[J].Journal of Jiamusi University(Natural Science Edition),2013,31(2):214-217.(in Chinese)