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为研究传统风格建筑钢框架结构的抗震性能,对缩尺比1∶2的一榀钢框架结构进行拟动力试验,在峰值加速度不大于400 cm/s~2的El Centro波、Taft波、兰州人工波和汶川波作用下,结构基本处于弹性阶段。在峰值加速度为620 cm/s~2的汶川波作用下,部分斗栱屈服,抗震性能优越。对模型进行动力弹塑性时程分析,结果表明:在400 cm/s~2和620 cm/s~2时,所得的位移时程曲线和加速度时程曲线与试验结果有较高的吻合度,说明了动力时程分析的合理性。在800 cm/s~2时,柱节点处的斗栱已大面积屈服,且梁端应力也接近屈服强度,分析可得构件的屈服顺序是斗栱先屈服,然后梁端屈服,最后柱端屈服。该传统风格建筑钢框架结构的斗栱起到了第一道抗震设防的作用,具有良好的抗震性能。
In order to study the seismic performance of steel frame structures with traditional styles, a pseudo-dynamic test is performed on a 1:2 scale steel frame structure with a scale ratio of 1:2. The El Centro waves, Taft waves, and Lanzhou waves with peak accelerations of less than 400 cm/s~2 are used. Under the action of artificial waves and Wenchuan waves, the structure is basically in the elastic stage. Under the action of the Wenchuan wave with a peak acceleration of 620 cm/s~2, some buckets yield and the seismic performance is superior. The dynamic elastoplastic time history analysis of the model shows that the obtained displacement time history curve and acceleration time history curve have a good agreement with the test results at 400 cm/s~2 and 620 cm/s~2. Explains the rationality of dynamic time history analysis. At 800 cm/s~2, the bucket joint at the column joint has yielded over a large area, and the beam end stress is also close to the yield strength. The yield order of the analytically obtainable member is the yielding of the bucket first, then the beam end yields, and finally the column end yield. The traditional style building steel frame structure plays the role of the first seismic fortification and has good seismic performance.