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Volume 37 Issue 5
Sep.  2022
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Article Navigation >  STEEL CONSTRUCTION(Chinese & English)  > 2022  >  37(5): 18-27
Lingxiao Zuo, Weitong Yi, Lei Zhu, Donglin Lyu, Hailin Sun. Methods for Determining Ultimate Bearing Capacity of Steel Beam-Column Joints Based on Moment-Rotation Curves[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(5): 18-27. doi: 10.13206/j.gjgS22031101
Citation: Lingxiao Zuo, Weitong Yi, Lei Zhu, Donglin Lyu, Hailin Sun. Methods for Determining Ultimate Bearing Capacity of Steel Beam-Column Joints Based on Moment-Rotation Curves[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(5): 18-27. doi: 10.13206/j.gjgS22031101
shu

Methods for Determining Ultimate Bearing Capacity of Steel Beam-Column Joints Based on Moment-Rotation Curves

doi: 10.13206/j.gjgS22031101

  • 1. Beijing Advanced Innovation Center for Future Urban Design, School of Civil and Transportation Engineering in BUCEA, Beijing 100044, China;

  • 2. Beijing Higher Institution Engineering Research of Civil Engineering Structure and Renewable Material in BUCEA, Beijing 100044, China;

  • 3. Beijing Key Laboratory of Advanced Functional Materials for Building and Environment in BUCEA, Beijing 100044, China;

  • 4. China Architecture Design & Research Group, Beijing 100044, China

  • Received Date: 2022-03-11
    Abstract
  • For beam-column steel joints,the moment-rotation curve is an important criterion of the ultimate bearing capacity,as well as an essential criterion for the design of joints.Generally,the moment-rotation curve of a joint has both ascending and descending range,therefore,the ultimate bearing capacity of the joint can be captured intuitively by the peak point of the curve.However,for some curve which is monotone increasing without an obvious peak point,the detemination of the ultimate bearing capacity needed to be further studied.Based on this issue,methodology of deformation limit will be discussed,in order to determine the ultimatate capacity.
    Firstly,current codes as well as corresponding researches on methods of displacement limit calculation are summarized.These methods can be classified in two types,one is through the displacement of the chord,and another is through the brace.CIDECT method belongs to the type of chord,which takes the value of chord deformation in 3% of chord diameter as the ultimate deformation limit.Lu's method,as an improvement of CIDECT method,considering the relationship of load between the deformation of 1% and 3% of chord diameter,when the load of 3% is higher than 1.5 times load of 1%,and then the value of 1.5 times load of 1% is taken as the ultimate bearing capacity,otherwise,the value of 3% is taken as the ultimate point.TEC (Twice Elastic Method) is also belongs to the type of chord,which draws a straight line that the slope is half of the initial stiffness through the origin,and the intersection between the line and the curve is the ultimate point.Yura's method belongs to the type of brace,in which the brace is regarded as a simply supported beam with uniform load,when the strain in the middle of the beam span is 4 times the yield strain of the material,it is considered to reach the limit.Secondly,in view of situation that Yura's method is not adopted in codes,a series of steel circular tubular joint tests as well as finite element analysis are carried out to verify the method.Finally,the application of methods above were explored by taking the example of joints with square steel tubular column and H-shaped beam.Four groups of tests were designed and corresponding finite element simulation was carried out.After comparing the experimental and simulation results which verified the reliability of the simulation,the ultimate rotation angles of the above different methods are evaluated based on the finite element simulation results.
    Results indicated that the application of Yura's method for joints of steel tubular column and H-shaped beam is feasible.The results obtained by Lu's method are relatively conservative and the operation is complicated.TEC method requires complete moment-rotation curves of joints,and is also complex to operate and prone to errors,so its applicability is limited.CIDECT and Yura's methods are relatively easy to operate,as the ultimate deformation can be estimated as long as the diameter of the chord or brace is determined,and the difference of the ultimate rotation obtained by these two methods is minor.Therefore,this research suggests to use these two methods to calculate the corresponding ultimate rotation,and take the smaller as the ultimate limit.
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    • References(24)
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