钢-预应力混凝土混合梁节点的试验研究(第1部分:建议采用开孔板连接件的节点形式)

旨在为跨中采用钢梁、两端采用预应力混凝土梁的Ⅰ型混合桥梁选用一种适当的节点形式。分别对采用3种类型的节点的钢-预应力混凝土混合梁进行缩尺模型试验,以分析哪种节点形式的结构性能最好且便于施工。目前,研究中首先采用的一种节点形式,是位于钢梁和混凝土梁之间的顶底板上的多个开孔板连接组成。另2种节点形式结合了广泛应用于钢结构和混凝土结构之间的螺栓连接,而区别在于加强措施的数量。试验结果显示:从预应力混凝土构件的破坏模式看,采用开孔板连接件和采用有足够加强措施的螺栓连接有近似的梁的强度和破坏模式。显而易见,采用被建议的开孔连接板与采用螺栓连接相比,在达到梁极限承载力之前有更高的刚度、强度及更小的应变。可以肯定的是采用开孔板连接件,更便于施工且结构性能好。因此,可以得出文中建议的节点形式更适合于钢-预应力混凝土混合梁桥梁的结论。

Experimental Study on Joint of Spliced Steel-PSC Hybrid Girder,Part I:Proposed Parallel-Perfobond-Rib-Type Joint

The object of this study is to determine and propose a suitable joint type for spliced hybrid I-girder bridges consisting of steel girders at the mid-span and PSC(prestressed concrete)girders at the supports.Three joint types are experimentally tested on small-scale steel-PSC hybrid beams to determine the type offering the best combination of structural capacity and constructional convenience.One joint type,first suggested and trialed in the present study, is composed of multiple perfobond rib connectors at...