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钢桁架设计通常按节点铰接考虑,但实际结构中节点刚性不可避免,由此产生的次内力对结构性能带来不同程度的影响。以典型Warren桁架为研究对象,对杆件次应力分布及其受节点刚域的影响规律进行了计算分析。在此基础上,提出了采用领结式整体节点来改善钢桁架次内力的具体方法。这种节点通过缩小节点区域的杆端截面高度,有效降低了节点刚性的影响,使实际结构更加趋于理想铰接模型。最后对这种新型节点的缩尺设计参数、杆件用钢量优化以及可能存在的问题及其对策进行了探讨。研究结果表明,采用领结式整体节点能较大幅度降低钢桁架的次内力,从而提高结构的力学性能和经济性指标,该方法有望在进一步深入分析之后应用于实际工程。
Steel truss design is usually hinged at nodes, but the rigidity of nodes in the actual structure is unavoidable. The resulting secondary internal forces will affect the structural performance to varying degrees. Taking the typical Warren truss as the research object, the secondary stress distribution of the bars and the influence law of them on the rigid area of the joints are calculated and analyzed. On this basis, a specific method of using bow-tie integral nodes to improve the secondary internal forces of steel truss is put forward. By reducing the height of rod-end cross-section in the node area, this kind of node can effectively reduce the influence of node rigidity and make the actual structure more idealistic hinge model. Finally, the scale design parameters of this new type of node, the amount of steel rod and the possible problems and countermeasures are discussed. The results show that using the overall knot node can reduce the secondary internal force of the steel truss greatly, so as to improve the mechanical properties and economic index of the structure. The method is expected to be applied to practical engineering after further analysis.