混凝土框架-钢柱阀厅结构振动台试验研究
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摘要
本文对混凝土框架-钢柱换流站阀厅结构进行了地震模拟振动台试验。根据原型结构特点及试验室现有条件设计和制作了1/8满配重模型缩尺模型,选定了三种适用于不同场地类别的地震动进行逐级加载,在每级地震动加载前后,均对结构进行了白噪声输入。研究了阀厅结构地震响应(包括加速度放大系数、索的动拉力等)、结构固有频率变化、结构阻尼比和整个结构的裂缝发展情况。试验结果表明,阀塔对阀厅整体结构地震效应较小,但在7度罕遇地震验算或高于7度地区阀厅设计时,在阀塔连接部位构件设计时应考虑动拉力的影响;该结构可满足7度抗震设防要求,但在抗震设防更高烈度地区应用应慎重。
The seismic performance of the concrete frame-steel column structure of the converter station valve hall under earthquake with different intensities was measured by shaking table tests.A 1/8 full weight scaled model was designed according to the prototype structure and the conditions of laboratory.Three kinds of scaled ground motion accelerations were applied as the seismic excitations.White noise was input to the structure.The natural frequencies,seismic responses,structural damping ratios and the development of cracks of the whole structure were investigated.The results show that the valve group has little seismic response effect on the overall structure,but the dynamic tension of the component parts of the valve tower connection should be considered in intensity seven of seldom occurring earthquake.The concrete frame-steel column structure can meet the demand in areas with seismic intensity seven,but the application of this type of structure in the areas with higher seismic intensities should be avoided.
The seismic performance of the concrete frame-steel column structure of the converter station valve hall under earthquake with different intensities was measured by shaking table tests.A 1/8 full weight scaled model was designed according to the prototype structure and the conditions of laboratory.Three kinds of scaled ground motion accelerations were applied as the seismic excitations.White noise was input to the structure.The natural frequencies,seismic responses,structural damping ratios and the development of cracks of the whole structure were investigated.The results show that the valve group has little seismic response effect on the overall structure,but the dynamic tension of the component parts of the valve tower connection should be considered in intensity seven of seldom occurring earthquake.The concrete frame-steel column structure can meet the demand in areas with seismic intensity seven,but the application of this type of structure in the areas with higher seismic intensities should be avoided.
引文
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[5]GB 50011-2010建筑设计抗震规范[S].
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[2]王常峰,李伟.悬挂质量结构减震性能及影响因素分析[J].兰州交通大学学报,2004,23(3):102-105.
[3]Anh N D,Matsuhisa H,Viet L D,et al.Vibration control of an Inverted pendulum type structure by passive mass-spring-pendulum dynamic vibra-tion absorber[J].Journal of Sound and Vibration,2007,307:187-201.
[4]Nikolaen N A,Burgamen I N.Earthquake resistance of structures with suspended masses[C]//Proceedings of 5th International Symp on Earth-quake Structural Engineering.Missouri USA.University Missouri,1976:683-698.
[5]GB 50011-2010建筑设计抗震规范[S].
[6]张敏政.地震模拟试验中的相似律应用的若干问题[J].地震工程与工程振动,1997,17(2):52-58.
[7]周颖,吕西林,卢文胜,等.不同结构的振动台试验模型等效设计方法[J].结构工程师,2006,8(4):37-40.
[8]Ogawa N,Katayama T,Shibata H.Construction of a three-dimensional large-scale shaking table and development of core technology[J].philos TRoy SocA,2001,(359):1725-1751.
[9]朱伯龙.结构抗震试验[M].北京:地震出版社.1989:63-70.
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