组合结构维修机库阻尼比对地震响应的影响
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摘要
为研究组合结构维修机库的阻尼比及其对结构地震响应的影响,依据位能加权平均法编制了程序,计算了3种不同跨度的网架屋盖维修机库的阻尼比,考察了混凝土柱支承刚度对整体结构阻尼比的影响,并对比分析了按计算阻尼比与工程阻尼比计算结构地震响应的差异.结果表明,网架维修机库的整体阻尼比为0.0215～0.0235,小于实际工程计算中采用的假定阻尼比(工程阻尼比)0.03;对混凝土柱支承的跨度在100 m以上采用双层网架维修机库,建议结构整体阻尼比可取为0.023左右;柱支承刚度对阻尼比取值有一定影响,但不显著;按工程阻尼比计算的地震响应比按计算阻尼比计算的地震响应小10%～20%,因此按协同工作分析结构地震响应时,必须具体分析体系的整体阻尼比,确保计算合理可靠.
To examine the damping ratio and its influence on seismic response of the maintenance hangar, firstly,the equivalent structures concept,which is through potential energy and damping ratio shared by structural members with different materials,was used to obtain the damping ratio.Additionally,the related program was developed.According to the program,the damping ratio for the interest structures with three kinds of span is determined.Meanwhile,the value of damping ratio which varied with the stiffness change by the RC columns was discussed.Finally,based on two kind of damping ratio,such as value calculated from method mentioned in the paper and value selected in practical design,the difference of the seismic response from two types damping ratio are compared.It is shown that the damping ratio of double-layer diagonal on diagonal space frame supported by the RC columns is below 0.023 5,which is smaller than the 0.03 damping ratio for the current practical design.Therefore,the damping ratio should be analyzed specifically for evalu- ating the dynamic behavior of hangars.The stiffness of the RC columns has minor impacting on the damping ratio.For practical design,if the span of hangar is larger than 100 m,0.023 would be reasonable damping ratio.The seismic responses calculated with calculating damping ratio are 10%～20% larger than the result from damping ratio for practical design.
To examine the damping ratio and its influence on seismic response of the maintenance hangar, firstly,the equivalent structures concept,which is through potential energy and damping ratio shared by structural members with different materials,was used to obtain the damping ratio.Additionally,the related program was developed.According to the program,the damping ratio for the interest structures with three kinds of span is determined.Meanwhile,the value of damping ratio which varied with the stiffness change by the RC columns was discussed.Finally,based on two kind of damping ratio,such as value calculated from method mentioned in the paper and value selected in practical design,the difference of the seismic response from two types damping ratio are compared.It is shown that the damping ratio of double-layer diagonal on diagonal space frame supported by the RC columns is below 0.023 5,which is smaller than the 0.03 damping ratio for the current practical design.Therefore,the damping ratio should be analyzed specifically for evalu- ating the dynamic behavior of hangars.The stiffness of the RC columns has minor impacting on the damping ratio.For practical design,if the span of hangar is larger than 100 m,0.023 would be reasonable damping ratio.The seismic responses calculated with calculating damping ratio are 10%～20% larger than the result from damping ratio for practical design.
引文
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[2]LIU Shu-tun.Design and construction of 306 m span hangar roof at capital airport [J].International Journal of Space Struc- tures,1999,14(3):185-189.
[3]JOGLEKAR S G,KHANRA K K,NAVANI K P,et al.Long span space frame hangar roof with suspended docking system and cranes for heave maintenance of 747-400 aircraft for air india at mumbai india [J].International Journal of Space Struc- tures,1999.14(3):197-209.
[4]张毅刚，曹资．厦门太古飞机工程维修基地网架抗震分析[J]．空间结构，1999，5(1)：35-42．ZHANG Yi-gang,CAO Zi.A seismic analysis for space frame of hangar in Xiamen Tai-Gu aircraft maintenance base [J]. Spatial Structures,1999,5(1):35-42.(in Chinese)
[5]曹资，张超，张毅刚，等．网壳屋盖与下部支承结构动力相互作用研究[J]．空间结构，2001，7(2)：19-26．CAO Zi,ZHANG Chao,ZHANG Yi-gang,et al.A study on the dynamic interaction between lattice shells and the supporting structures [J].Spatial Structures,2001,7(2):19-26.(in Chinese)
[6]SHIBATA Akenort,SOZEN Mete A.Substitute structure method for seismic design R/C [J].Journal of the Structural Divi- sion,1976,102(1):1-9.
[7]中华人民共和国建设部．GB 50011—2001建筑抗震设计规范[S]．北京：中国建筑工业出版社，2001．
[8]沈顺高．大跨度机库方案的概念设计与动力性能研究[D]．北京：清华大学土木水利学院，2002．SHEN Shun-gao.Research on the concept design and dynamic behavior of long-span hangar[D].Beijing:The School of Civil Engineering,Tsinghua University,2002.(in Chinese)
[9]CLOUGH Ray W,PENZIEN Joseph.Dynamics of structures [M].Teipei:McGraw-Hill Co,1993.
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