基于增设PBL锚固件的新型外露式钢柱脚设计研究

Research on Design of New Exposed Steel Column Base Based on Addition of PBL Anchoring Parts

为满足设计中外露式钢柱脚在桥梁工程中的刚性连接承载力需求,归纳整理了工程设计中外露式钢柱脚刚性连接的常用计算规定,基于西安某人行天桥工程桥墩的受力需求提出了一种增设PBL锚固件的新型外露式钢柱脚设计,并进一步在工程实例中计算分析了该新型外露式钢柱脚的承载能力结果及特性。结果表明:同等尺寸下,新型外露式钢柱脚刚性连接时可以提供更高的侧拉锚固力,但需配合更高的基面混凝土抗压强度,具备一定的施工便利性,但对施工精度要求较高。

In order to meet the bearing capacity demand of rigid connection of exposed steel column base in the engineering design of bridge,the common calculation regulations for rigid connections of exposed steel column base in engineering design are concluded and cleared up.A new design of exposed steel column base with additional PBL anchoring parts is proposed,which is based on the force demand of piers in a pedestrian bridge in Xian.And then the bearing capacity results and characteristics of the new exposed steel column base are further calculated and analyzed in an engineering example.The result shows that under the same size,the new exposed steel column base can provide the higher lateral tensile anchorage force under rigid connection,but it needs to be matched with higher compressive strength of base concrete.At the same time,its construction convenience is retained,while high construction precision is required.