摘要
以实际工程为背景,对平面不规则复杂超限结构进行地震模拟振动台试验研究,量测模型结构动力特性、阻尼比及其在不同水准地震作用下加速度、位移等动力反应,研究结构破坏机理及模式。试验结果表明,模型结构X方向经历7°多遇及基本烈度地震后基本保持弹性状态。结构X向一阶自振频率为5.610 Hz,阻尼比2.995%;Y向一阶自振频率5.484 Hz,阻尼比2.478%,随加速度幅值的增加自振频率逐渐降低,阻尼比提高;罕遇地震作用后模型结构Y向自振频率较震前下降约15%,阻尼比提高至6.531%,7°多遇地震下结构X、Y向最大层间位移角分别为1/1071,1/799,罕遇地震下结构最大层间位移角为1/120,均满足规范要求。多遇地震Kobe波激励下结构上部楼层最大位移比达1.331,存在一定扭转不规则,但程度较小。试验表明原型结构设计基本合理,整体抗震性能较好。并对原型结构设计提出建议。
Abstract
A shaking table test of complex transfinite structure with plane irregularity is carried out set against a backdrop of a practical project. The dynamic characteristics and damping ratio are examined, together with the acceleration and displacement for different seismic intensities. The failure mechanism and failure modes of the structure are studied in detail. The experiment results show that the model structure is still in elastic state under both frequently occurred and basic intensity earthquake in X direction. The fundamental natural frequency and damping ratio of the model structure in X direction is 5.610Hz and 2.995%, and that in Y direction is 5.484Hz and 2.478% respectively. Along with the increase of the acceleration amplitude, the vibration frequency of model structure has reduced while the damping ratio has increased. The vibration frequency of model structure has reduced by 15% and the damping ratio has increased to 6.531% under the rare earthquake. The maximum inter-story drift ratio of the model structure in X and Y direction are 1/1071 and 1/799 under the frequent earthquake of magnitude of 7, as well as 1/120 in Y direction under the rare earthquake. All above ratio can meet the requirements of the design code. Under the acceleration of Kobe wave of frequent earthquake, the upper floors’ maximum displacement ratio has reached 1.331 and a less irregularity torsional vibration has occurred. A rational structural design and good seismic behavior of the practical project are approved by the test. Finally, some suggestions are put forward according to the test and analysis results.
关键词
平面不规则结构 /
超限 /
缩尺模型 /
振动台试验 /
动力反应
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Key words
structure with plane irregularity /
transfinite /
scaled model /
shaking table test /
dynamic response
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王 斌;王曙光;刘伟庆;杜东升.
平面不规则复杂超限结构振动台试验研究[J]. 振动与冲击, 2014, 33(16): 135-141
WANG Bin;WANG Shu-guang;LIU Wei-qing;DU Dong-sheng.
Shaking table test of a complex transfinite structures with plane irregularity[J]. Journal of Vibration and Shock, 2014, 33(16): 135-141
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