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法门寺合十舍利塔为特殊的竖向倒转收进结构,主体结构为倾斜外挑内收的型钢混凝土筒体,沿高度在两处形成拐点,底层为框支转换层,顶部通过型钢混凝土桁架连接形成连体结构。为了研究其抗震性能,对其1/35整体模型进行了模拟地震振动台试验,测试了模型结构的动力特性及其在7度多遇、7度基本、7度罕遇、8度罕遇水准地震作用下的加速度、位移反应等,研究了模型结构的破坏机理和破坏模式,并根据试验结果,分析了原型结构的动力特性及地震反应。试验结果表明:模型结构第1、2、3阶振型频率分别为6.348Hz(平动)、6.836Hz(平动)和14.746Hz(整体扭转),原型结构对应的前3阶振型周期分别为0.933s、0.866s、0.401s,扭转、平动周期比为0.43;在7度基本及7度罕遇水准地震作用下结构最大层间位移角分别为1/754和1/453,表明原型结构整体抗震性能较好,能够满足中震基本弹性、大震不倒的抗震设防要求。建议采取适当措施缓解4层楼板标高附近筒体墙身的应力集中,并进一步研究结构外挑端部及其上下楼层竖向反应及其与水平反应的耦联性。
Famen Temple joint stupa tower for a special vertical reversal retract structure, the main structure of the incline external pick steel reinforced concrete cylinder, along the height of the inflection point formed at two places, the bottom of the box for the conversion layer, the top of the steel-concrete truss connection Form a Siamese structure. In order to study the seismic performance, the seismic shaking table test was carried out on the 1/35 whole model. The dynamic characteristics of the model structure and the dynamic characteristics of the model structure at seven degrees, seven degrees, seven degrees, rare degree The acceleration and displacement response under earthquake, the failure mechanism and failure mode of the model structure are studied. According to the test results, the dynamic characteristics of the prototype structure and the earthquake response are analyzed. The experimental results show that the first, second and third order mode shapes of the model structure are 6.348Hz (translational), 6.836Hz (translational) and 14.746Hz (overall torsion), respectively 0.964 s, 0.401 s, and the torsional and translational period ratio was 0.43. The maximum inter-story drift angles were 1/754 and 1/453 respectively for the 7-degree and 7-degree rare earthquakes, indicating that the prototype The overall seismic performance of the structure is good, which can meet the seismic fortification requirements of the basic elastic earthquake and the large earthquake. It is suggested that appropriate measures should be taken to relieve the stress concentration on the wall of the cylinder body near the 4-floor floor elevation and to further study the vertical response of the outer part of the structure and its upper and lower floors and its coupling with the horizontal response.