Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (7): 2061-2066.doi: 1013229/j.cnki.jdxbgxb.20220233

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Seismic performance analysis of building double beam column joints based on load displacement hysteretic curve

Zhen-yong DI1(),Xin-hui YANG2,Xiao LIN1   

  1. 1.Audit Office，Southwest University，Chongqing 400715，China
    2.Foundation Research Institute，Chinese Academy of Building Sciences，Beijing 100023，China
  • Received:2022-03-10 Online:2023-07-01 Published:2023-07-20

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Abstract:

The seismic performance of building double-beam-column joints is analyzed， in order to accurately obtain the changing characteristics of the building structure when earthquake occurs， and improve the seismic safety of the building. The seismic failure process is divided into four stages： initial concrete cracking， yield of beam column stirrups， maximum node bearing capacity， and core area failure. The building damage standard is set， and the damage form of beam-column joints is clarified； the seismic performance of joints is affected by factors such as concrete strength， horizontal stirrups， and beam ends. The basic assumptions of the nodes in the loading process are set， and the deformation displacement of the double beam itself， the displacement caused by the column deformation， and the deformation displacement of the core area are calculated separately， and the three displacements are added to obtain the overall displacement. In the experimental analysis， the load-displacement hysteresis curve is used to study the joint degradation stiffness. The experimental results show that the stiffness gradually decreases with the increase of the displacement； through the maximum load characteristic value and the ductility coefficient， it is proved that the seismic performance of the double beam-column joint is higher than that of the single beam-Column node； the seismic performance of the core area under the node is the weakest， which is easy to cause building deformation， but the seismic performance can be effectively improved by strengthening the concrete strength.

Key words: load displacement hysteretic curve, double beam column joint, seismic performance, core area, ductility coefficient

CLC Number: 

  • TU391

Fig.1

Plane schematic diagram of the specimen"

Table 1

Specimen performance parameter table"

试件部位参数设置
上梁截面翼缘250×25 mm
上梁截面腹板150×20 mm
下梁截面翼缘220×25 mm
下梁截面腹板130×20 mm
圆钢管柱截面380×20 mm

Fig.2

Nodal stiffness degradation trend"

Table 2

Maximum load characteristic values ofdifferent test pieces"

试件编号最大荷载/kN延性系数平均值
屈服点极限点破坏点
双梁?柱节点145.255.747.93.52
双梁?柱节点244.862.148.4
单梁?柱节点133.144.222.52.18
单梁?柱节点234.941.321.7

Fig.3

Shear deformation curves of different coreareas of nodes"

Fig.4

Performance comparison of joints under different strength concrete"

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