考虑上下协同工作大跨度储煤结构的抗震性能
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摘要
为了研究多维地震作用下大跨度储煤结构的振动特性,通过对考虑上下部协同工作的双层网壳结构进行了多维地震响应分析,对比分析双层网壳结构在单维地震与多维地震动作用下的动力响应的差别,分析结果表明:采用一致地震激励的方法进行大跨度网壳结构的动力分析是不够完善的,在进行前期工程设计时,大跨度空间结构其上下协同工作的特性不容忽视,在多维一致地震作用下,整体结构的各杆件内力响应整体大于网壳结构,下部支承结构附近的节点位移和杆件内力变化较大;多点地震激励下的整体结构的杆件内力响应整体小于一致激励,当视波速取值较大时,杆件内力与一致激励较接近。可为今后类似大跨度空间结构工程参考和借鉴。
In order to investigate the vibration characteristics of big span structure for coal storage,the multidimensional seismic response analysis of double-layer reticulated shell was conducted with consideration of the cooperative work between upper structure and infrastructure.Through the comparative analysis of the difference of the dynamic response of double-layer reticulated shell between the integrated and multi-dimensional earthquakes,it was found that the consistent earthquake incentive method which is used for the dynamic analysis of latticed shell structures was not perfect.In predesign,the cooperative work between the upper structure and infrastructure of latticed shell structure should not be neglected.In multi-dimensional earthquake,the internal force response of each link is greater than that of the entire structure,and the nodal displacement and internal force of the bar of the lower bearing structure change greatly.The internal force response of each link of the entire structure under the excitation of multipoint earthquake is smaller than that of the structure under uniform excitation.When the value of apparent velocity is larger,the internal force response of each link of the entire structure under the excitation of multipoint earthquake is closer to that of the structure under uniform excitation.The conclusions can provide reference for similar long-span space structure engineering in the future.
In order to investigate the vibration characteristics of big span structure for coal storage,the multidimensional seismic response analysis of double-layer reticulated shell was conducted with consideration of the cooperative work between upper structure and infrastructure.Through the comparative analysis of the difference of the dynamic response of double-layer reticulated shell between the integrated and multi-dimensional earthquakes,it was found that the consistent earthquake incentive method which is used for the dynamic analysis of latticed shell structures was not perfect.In predesign,the cooperative work between the upper structure and infrastructure of latticed shell structure should not be neglected.In multi-dimensional earthquake,the internal force response of each link is greater than that of the entire structure,and the nodal displacement and internal force of the bar of the lower bearing structure change greatly.The internal force response of each link of the entire structure under the excitation of multipoint earthquake is smaller than that of the structure under uniform excitation.When the value of apparent velocity is larger,the internal force response of each link of the entire structure under the excitation of multipoint earthquake is closer to that of the structure under uniform excitation.The conclusions can provide reference for similar long-span space structure engineering in the future.
引文
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[14]曹资,薛素铎,王雪生,等.空间结构抗震分析中的地震波选取与阻尼比取值[J].空间结构,2008,14(3):3-8.
[15]王凡,王星.复合材料板锥网壳结构的受力性能分析[J].广西大学学报:自然科学版,2009,34(3):283-288.
[2]张毅刚,蓝倜恩.网架结构在竖向地震作用下的实用分析方法[J].建筑结构学报,1985,5(1):1-15.
[3]曹资,张毅刚.单层球面网壳地震反应特征分析[J].建筑结构,1998,8(1):40-43.
[4]高博青,董石麟.双层柱面网壳结构在竖向地震作用下的动力特性研究[J].空间结构,1996,2(3):32-35.
[5]李宏男.结构多维抗震理论与设计方法[M].北京:科学出版社,1998.
[6]NIKOLAEN N A,BURGAMEN I N.Earthquake resistance of structures with suspended masses[C]//Md Azlin Mol Said.Proceedings of 5th International Symptom Earthquake Structural Engineering,Missouri,USA:University Missouri,1976:683-698.
[7]范峰,支旭东,沈世钊.大跨度网壳结构强震失效机理研究[J].建筑结构学报,2010,31(6):153-159.
[8]DOBRY R,GAZETAS G.Dynamic response of arbitrarily shaped foundations[J].Geotech J Engrg,1986,112(2):109-135.
[9]董石麟.预应力大跨度空间钢结构的应用与展望[J].空间结构,2001,7(4):3-13.
[10]姚志东.基于数值模拟方法的大跨度结构表面风荷载的计算与分析[D].北京:北京交通大学土木建筑工程学院,2008.
[11]杨大彬,张毅刚,吴金志.基于ANSYS的灵敏度分析及其在单层网壳中的应用[J].世界地震工程,2009,25(4):87-91.
[12]杨大彬,张毅刚,吴金志,等.K6型单层球面网壳弹塑性稳定极限承载力的杆件灵敏度分析[J].空间结构,2010,16(2):46-49.
[13]沈世钊,支旭东.球面网壳结构在强震下的失效机理[J].土木工程学报,2005,38(1):11-20.
[14]曹资,薛素铎,王雪生,等.空间结构抗震分析中的地震波选取与阻尼比取值[J].空间结构,2008,14(3):3-8.
[15]王凡,王星.复合材料板锥网壳结构的受力性能分析[J].广西大学学报:自然科学版,2009,34(3):283-288.
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