Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (4): 1058-1064.doi: 10.13229/j.cnki.jdxbgxb.20221356

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Calculation method for bearing capacity of seismic joints of beam column rigid connections in multi story and high rise buildings

Zhen-yong DI1(),Yong ZHANG2   

  1. 1.Audit Department，Southwest University，Chongqing 400715，China
    2.Beijing Municipal Engineering Design and Research Institute Co. ，Ltd. ，Beijing 100082，China
  • Received:2022-11-21 Online:2024-04-01 Published:2024-05-17

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Abstract:

In view of the one-sided problem in the current research on the bearing capacity of seismic joints with rigid connections between beams and columns， a calculation method for the bearing capacity of seismic joints with rigid connections between beams and columns in multi story buildings is proposed. This method is used to design three types of seismic joint core area of rigid connection between beam and column： only adding steel fiber， only adding stirrup， and adding steel fiber and stirrup at the same time. Nine specimens are made according to the different volume ratio of steel fiber and stirrup ratio. With the nine specimens as the experimental object， after designing the test loading scheme and the distribution of measuring points， the seismic joint specimen model of rigid connection between beam and column of multi story buildings is constructed using finite element software， The model is used to simulate its test loading scheme. At the same time， the calculation of seismic joints of beam column rigid connection of multi story and high-rise buildings is realized by calculating the bending capacity of T-shaped steel， bolt capacity and column flange capacity of the specimens of seismic joints of beam column rigid connection of multi story and high-rise buildings. The experimental results show that the calculation results of the bearing capacity of the steel webs of the seismic joints of beam column rigid connections by this method agree well with the actual bearing capacity； It can effectively calculate the shear bearing capacity and bending bearing capacity of specimens with steel fibers and stirrups added in different core areas， and at the same time， it can clearly show the distribution of different bearing capacity of seismic joints of beam column rigid connection by using the finite element cloud diagram.

Key words: multi story buildings, building beams and columns, seismic node, bearing capacity, finite element, loading scheme

CLC Number: 

  • TU393

Fig.1

Specimen size and stirrup configuration of seismic joint of beam column rigid connection"

Table 1

Parameters of seismic node specimens of rigid connection between beam and column"

试件编码试件类型钢纤维体 积率/%箍筋添 加率/%
KZ-1核心区仅添加钢纤维0.6/
KZ-21.5/
KZ-32.0/
KZ-4核心区仅添加箍筋/0.6
KZ-5/1.5
KZ-6/2.0
KZ-7核心区同时添加 钢纤维与箍筋0.60.6
KZ-81.51.5
KZ-92.02.0

Table 2

Mechanical performance parameters of stirrups of seismic node specimens of beam column rigid connection"

力学性能参数钢筋直径/mm
61220
屈服强度/MPa305.24362.17420.52
抗拉强度/MPa480.13585.64641.39
弹性模量MPa2.07×1052.02×1051.97×105

Fig.2

Loading diagram of experimental device for seismic node specimen of rigid connection between beam and column"

Fig.3

Distribution of test points of seismic node specimens of beam column rigid connection"

Fig.4

Finite element model of seismic node of beamcolumn rigid connection （part）"

Fig.5

Calculation of bearing capacity of steel webs ofseismic joints of beam column rigid connection"

Table 3

Shear bearing capacity and bending bearingcapacity of 9 seismic joints of rigid connectionbetween beam and column"

试件编码受剪承载力/kN受弯承载力/kN
KZ-1233.08246.28
KZ-2241.98283.11
KZ-3266.15307.15
KZ-4247.82232.11
KZ-5259.19243.03
KZ-6291.34270.52
KZ-7303.56299.18
KZ-8352.44330.46
KZ-9380.93369.85

Fig.6

Cloud chart of bearing capacity distribution of steel webs of seismic joints of beam column rigid connection"

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