一种用于农村住房的轻型框架结构抗震性能足尺试验

Full-scale test for seismic performance of a lightweight frame structure for rural houses

  • 摘要: 为升级农村住房水平以满足人们日益增长的对舒适、安全、环保、节能的需求,提出并设计了一种轻型框架结构体系住宅,该结构体系以钢框架作为结构主体,外挂ALC墙板作为填充墙体。通过振动台试验检验其抗震性能,获得该轻型框架结构在地震作用下梁柱节点和房屋整体的抗震性能和地震响应规律。设计足尺结构模型,输入El Centro、Taft、北京人工波进行振动台试验,通过布设传感器测量结构的地震响应。试验过程中,墙板未脱落,节点连接完好,结构未倒塌;随着输入地震作用强度的增大,结构的加速度放大系数、相对位移随之增大,但结构自振频率逐渐降低;试验过程中主体结构构件保持弹性,6度设防地震作用下结构层间位移角均小于1/250;7度罕遇、8度罕遇地震作用下,结构的层间位移角超过1/250,但通过拉紧拉杆支撑可减小结构变形。试验结果表明,该轻型框架结构体系具有较好的抗震性能,可达到6度抗震设防水准,对于6度以上抗震设防区可通过增大拉杆拉力等措施增强其抗震性能。

     

    Abstract: To upgrade the level of rural housing to meet the increasing demand for comfort, safety, environmental protection and energy saving, a light frame structure system housing was proposed and designed. The light frame structure system takes a steel frame as the main structural body and ALC wall panel as the filling wall. A full-scale shaking table test has been carried out to verify its seismic performance and to study the seismic behavior and seismic response law of the light frame structure system under earthquake action on beam-column joints, wall-slab joints, and the building structure. The test results show that the wall panel has not fallen off, the joint connection is intact, and the structure has not collapsed. With the increase of input seismic intensity, both the acceleration amplification factor and relative displacement increase, while the natural frequency of the structure decreases gradually. Throughout the test, the main structural members remain elastic, and the inter-story displacement angle of the structure under a fortification earthquake of 6-degree is less than 1/250. Under the action of rare earthquakes of 7th intensity and 8th intensity, the inter-story displacement angle of the structure exceeds 1/250, but the structural deformation can be reduced by tensioning reinforcement support. The light frame structure system exhibited excellent seismic performance and can be used to improve the level of rural housing in the 6th intensity seismic fortification area. For seismic fortification areas above 6th intensity, the seismic performance can be enhanced by increasing the tension of tie bars.

     

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