拱形立体桁架结构振动台试验研究

发布时间：2018-06-05 16:00

本文选题：拱形立体桁架 + 地震作用　；参考：《建筑结构学报》2014年04期

【摘要】：为研究拱形立体桁架结构在强震作用下的破坏模式,以一实际工程为背景,对拱形立体桁架结构进行缩尺比例为1/15的振动台试验。对模型相似比的选取、模型设计以及加载方案、测点布置等进行说明,得到各级人工波作用下,模型自振频率、阻尼比、加速度反应、位移反应以及杆件应变,研究模型自振特性的变化规律,获得拱形立体桁架结构在强震作用下的破坏模式。研究表明,随地震波峰值加速度的增大,结构各向自振频率和等效刚度降低,结构阻尼比增大。地震波向模型顶部传播过程中,加速度和位移响应随结构高度逐渐放大。当输入峰值加速度达到0.8g时,结构刚度迅速下降,主桁架斜腹杆大量屈曲;当输入峰值加速度达到1.0g时,结构刚度下降50%,发生平面内反对称变形。
[Abstract]:In order to study the failure mode of arch truss structure under strong earthquake, the shaking table test of arch three-dimensional truss structure with a scale of 1 / 15 is carried out on the background of a practical project. The selection of model similarity ratio, model design, loading scheme, measuring point arrangement and so on are explained. The natural vibration frequency, damping ratio, acceleration response, displacement response and member strain of the model are obtained under various levels of artificial waves. The failure mode of arch truss structure under strong earthquake is obtained by studying the variation law of the natural vibration characteristics of the model. The results show that with the increase of the peak acceleration of seismic wave, the natural frequency and equivalent stiffness of the structure decrease and the damping ratio of the structure increases. During the propagation of seismic waves to the top of the model, the acceleration and displacement responses are amplified with the height of the structure. When the input peak acceleration reaches 0.8 g, the stiffness of the structure decreases rapidly, and the buckling of the main truss inclined web rod is large, and when the input peak acceleration reaches 1.0 g, the stiffness of the structure decreases by 50%, resulting in the in-plane antisymmetric deformation.
【作者单位】：天津大学滨海土木工程结构与安全教育部重点实验室;天津大学建筑工程学院;
【基金】：国家自然科学基金项目(51078259,51308386) 教育部新世纪优秀人才支持计划项目(NCET10-0613)
【分类号】：TU311.3

【参考文献】