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为研究预拉对穿螺栓的新型PEC柱-钢梁T形件摩擦耗能型连接中节点滞回性能,考虑轴压力、PEC柱截面形式、钢板组合截面布置方式与摩擦力大小等设计参数,采用有限元软件ABAQUS建立了5个有限元分析模型试件并对其进行循环荷载下的数值模拟,得到试件的弯矩-转角滞回曲线。结果表明:摩擦耗能型连接方式不仅满足结构耗能延性性能设计目标,且承压型强度设计还能保证必要的安全冗余度;轴向力影响较小;摩擦力影响连接的耗能能力,但对其承载能力影响不明显;钢结构翼缘卷边措施可增强混凝土的约束作用,更好地满足“强柱弱梁”的抗震要求;预拉对穿螺栓表现部分自复位功效,且较好实现了混凝土斜压带传力机理,相应降低了对节点域腹板的抗剪要求;所有试件破坏模式均由于T形件的加强而使得梁截面的塑性铰出现位置向T形件腹板外排螺栓附近梁截面转移,且达到破坏时对应的节点转角均超过了0.04rad,表明该节点连接能较好满足抗震转动能力的需求。
In order to study the hysteretic behavior of pre-tensioned and bolted joints of a new type of PEC column-steel beam T-shaped friction-energy connection, considering design parameters of axial pressure, PEC column section, arrangement of plate sections and frictional force, The finite element software ABAQUS was used to establish five finite element analysis model specimens and simulate it under cyclic loading. The moment-angle hysteresis curve of the specimen was obtained. The results show that the frictional energy dissipation connection not only meets the design goal of ductile energy dissipation, but also ensures the necessary safety redundancy. The axial force has little effect. The frictional force affects the energy consumption of the connection , But its bearing capacity is not obvious; the steel flange curling measures can enhance the confinement effect of concrete to better meet the seismic requirements of “strong column and weak beam”; pre-pull bolt performance part self-resetting effect , And better the transmission mechanism of concrete baroclinic belt, correspondingly reduced the shear resistance requirements of the webs in the node domain. All the failure modes of the specimens caused the appearance of the plastic hinges in the beam cross section to T The beam cross section near the bolt of the profile web is transferred, and the corresponding node turning angle exceeds 0.04rad when it reaches the failure point, indicating that the node connection can better meet the requirements of seismic rotation capability.