大跨度叠层空腹桁架整体转换结构模型受力与抗震性能试验研究

以实际工程为背景,设计了两榀1/8缩尺的大跨度叠层空腹桁架转换结构模型。其中一榀模型为普通钢筋混凝土结构,另一榀模型在底部转换梁施加了预应力,并在底部转换梁及部分杆件采用了钢骨混凝土。本文介绍了两榀模型在竖向加载及拟动力水平加载下的受力性能、抗震性能和破坏机理,并就两榀转换结构模型的受力与抗震性能进行了对比分析。试验结果表明,该种转换结构不论在竖向还是水平地震作用下,其整体工作性能良好,具有足够的竖向承载力,可以实现延性破坏模式,采用部分钢骨混凝土的模型抗震性能更为优越;在底部转换梁中施加了预应力的模型,可以有效改善转换结构的刚度和抗裂性能。

Experimental study on bearing capacity and seismic behavior of large-span two-storied Vierendeel truss transfer structure

Regarding actual engineering as the back ground, two 1/8 scale large span two storied Vierendeel truss transfer structure models were tested. In which one of them was common reinforced concrete structure, and the other used prestressed steel reinforced concrete(PSRC) in bottom chord of the transfer structure. This paper introduced and analyzed the bearing capacity , seismic behavior and failure mechanism of the two models under vertical and quasi dynamic loads. The test results indicated that the transfer structure models have good performance of integrated work and satisfactory bearing capacity,and can realize ductile failure mode. The model with partial steel reinforced concrete expresses the performance more superior. The test results also showed that the prestressing force can efficiently improve the rigidity and crack resistance of the transfer structure.