椭圆型螺栓孔网架支座节点受力性能研究

在平板网架支座节点中,通常在支座底板开设椭圆型螺栓孔使节点有一定的侧移.虽然在网架设计中这类支座经常被采用,但有关此类支座节点受力性能的研究还很缺乏.椭圆型螺栓孔能提供多大程度的侧移,此类螺栓孔如何影响节点的承载力以及抗侧刚度等问题都有必要进一步深入研究.以一类常用的网架支座节点为例进行研究,利用大型通用有限元软件ABAQUS隐式求解器的接触功能,模拟螺栓杆和孔壁、螺栓帽和节点底板、节点底板和垫板之间的接触关系,分析在不同荷载模式下椭圆型开孔对网架支座节点受力性能的影响,确定此类节点的抗侧刚度,为工程设计提供理论依据.

Study on Mechanical Performance of Steel Plate Support with Oval Bolt Hole in Space Grid Structure

In order to design the sliding hinge support in space grid structure, the way of pre-reserving oval bolt hole in steel plate support so that it can provide some lateral drift is a common practice at present. Though this kind support is widely adopted in design, the mechanical performance of this support is researched insufficiently. For example, how much displacement this bolt hole could bear, and how this bolt hole could influence the load capacity and the lateral stiffness are still to be studied further. In this paper, a common used plate support with oval bolt holes is discussed. The contact between the bolt and the hole, the bolt cap and the plate, the bottom plate and the base plate is established respectively with the ABAQUS/Standard. Through analyzing the relationship between the lateral load capacity and displacement of steel plate support with oval bolt holes under different load modes , the lateral stiffness is determined to provide theoretical basis for engineering design.