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为了研究独塔斜拉桥横桥向不同约束体系的抗震性能,以海南铺前大桥为工程背景,设计制作缩尺比为1:20的全桥结构模型,进行不同地震动作用下模型振动台试验,给出了模型结构动力特性识别结果以及各动力响应测量结果。对横桥向固结体系和弹塑性体系2种约束体系的试验数据进行整理分析与对比得出:全桥模型横桥向的地震响应与地震动的频谱特性有关。远场地震动作用下,采用弹塑性钢阻尼器的弹塑性体系相对固结体系能有效地减小关键点位移响应和关键截面应变响应;而在近场地震动作用下,采用弹塑性钢阻尼器的弹塑性体系产生了较大的结构(如主塔、主梁)位移响应。
In order to study the seismic performance of single bridge cable-stayed bridge with different restraint systems, taking the Paqian Bridge in Hainan as the engineering background, a full-bridge structural model with scale ratio of 1:20 was designed and manufactured. The model shaking table Experimental results show the dynamic characteristics of the model structure recognition results and the dynamic response measurement results. The test data of the two kinds of restraint systems of transverse bridge consolidation system and elasto-plastic system are analyzed and compared. The results show that the seismic response of transverse bridge of full bridge model is related to the spectral characteristics of ground motion. Under the action of far-field ground motions, the relative consolidation of elasto-plastic system using elasto-plastic steel dampers can effectively reduce the critical point displacement response and the critical cross-section strain response. However, under the action of near-field ground motions, the elasto-plastic steel dampers Elastic-plastic system has a larger structure (such as the main tower, the main beam) displacement response.