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中山一桥是由一片中拱肋,两片边拱肋以及两片座拱肋组成的一种新型空间组合钢拱桥,该桥造型新颖独特,在国内外应用尚属首次。考虑到该桥细部构造在力的传递方面起关键作用,并且纵梁梁截面形式为挑臂较大的单箱双室箱形结构,所以基于1:10全桥试验模型,对中拱→座拱→边拱横梁结点、边拱和边拱横梁结点的细部构造以及纵向箱梁的剪力滞效应进行了试验研究,同时建立了空间三维全桥板壳模型用来校核试验结果、指导模型试验加载。通过试验结果与理论结果的比较可以看出二者基本吻合,试验和理论结果均表明在最不利荷载作用下该桥最大应力远小于设计容许值由此证明该桥细部构造设计是合理安全的。进一步的研究表明,在恒载作用下该桥纵梁的剪力滞效应受横梁、轴力的影响很大。
Zhongshan No.1 Bridge is a new type of space combination steel arch bridge composed of an arch rib, two arch ribs and two arch ribs. This bridge is unique in appearance and is the first time that it is applied at home and abroad. Considering that the structure of the bridge plays a key role in the transmission of force, and the cross-section of the longitudinal beam is single box dual chamber box structure with large pick-up arm. Therefore, based on the 1:10 full-bridge experimental model, The structure of the detail of arch edge beam, side arch and edge arch beam and the shear lag effect of longitudinal box beam were studied. At the same time, the space three-dimensional full-bridge shell model was established to check the test results, Guided model test loading. The comparison between the experimental and theoretical results shows that the two are in good agreement. The experimental and theoretical results show that the maximum stress of the bridge under the most unfavorable load is far less than the designed allowable value, which proves that the structural design of the bridge is reasonable and safe. Further studies show that the shear lag effect of the longitudinal beam under the action of dead load is greatly affected by the cross-beam and axial force.