新型混合结构体系在超高层建筑的应用研究

Application research on new hybrid structure systems in super-tall buildings

结合广州珠江新城西塔实际工程,对巨型钢管混凝土斜交网格外筒+钢筋混凝土内筒的新型混合结构体系进行了比例为1:50的微粒混凝土模型振动台试验及4根钢管混凝土柱"X"形相贯节点试验,探讨了体外预应力的施加对结构整体受力性能的影响。研究结果表明,结构模型在7度罕遇地震作用下基本可保持弹性,在8度罕遇地震作用后稍有损伤;交角对节点最终破坏形成区域及承载力影响较大,各节点的承载力均能满足设计要求;体外预应力的施加能有效地抵抗节点层平面内向外的推力,充分利用构件的受力性能。

The new hybrid structural system is introduced taking the Zhujiang Xincheng West Tower in Guangzhou as an example, which is made of huge reinforced concrete oblique-crossing - grid outer cylinder and reinforced concrete inside cylinder. The shaking table test of particle concrete model with 1 ： 50 scale size and the X-shaped joint test with four steel tubular columns filled with concrete were studied, and the effect of external pre-stress on the strucural holistic resistant behavior was also studied. It is shown that the model is nearly elastic under rare earth- quake action with intensity VH and there is a little damage under rare earthquake action with intensity VII, and the effects of intersection angle on final failure region and load capacity are significant. The load capacity of verious joints can meet the design requirements, and the external pre-stress can resist the outward thrust force in the layerplane of the node effectively, thus can make full use of force behavior of components.