分阶段受力的双铰接节点抗震与抗连续倒塌性能

ASEISMIC AND ANTI-COLLAPSE PERFORMANCE OF DOUBLE-HINGE JOINT WITH MULTISTAGE RESISTANCE

  • 摘要: 为解决现有钢框架梁柱节点未对地震与连续倒塌进行综合考虑的问题,研发兼具抗震与抗倒塌能力的新型节点。针对前期研究提出的可恢复功能双铰接节点,进行低周往复荷载试验。试验表明:双铰接节点的滞回曲线饱满且稳定,其抗震性能明显优于传统焊接节点,累积耗能增加了18%。在试验研究基础上,构建分阶段受力的双铰接节点。即在连接件中部设置前期不参与节点受力,而在后期提供较强轴拉力的拉结件,实现分阶段受力效果。采用拓扑优化方法,给出拉结区域的合理构造措施,明确了新型节点构造。而后考虑分阶段受力特性,通过理论分析建立了新型节点的简化荷载-位移关系,定量计算节点的抗震与抗倒塌性能。采用试验验证的模拟方法,分析新型节点的抗震与抗倒塌性能。分析结果表明:拉结件端部间隙对节点性能影响显著,节点在充分发挥钢梁的承载性能同时,仍具有震后可恢复功能能力。

     

    Abstract: To address the issue that the existing beam-column nodes of steel frames do not comprehensively consider earthquakes and continuous collapses, a new type of node with both seismic resistance and anti-collapse capabilities is developed. Cyclic loading tests were conducted for the double-hinge joints proposed in previous study. The test results show that the double-hinged joints have full and stable hysteresis curves. Their aseismic performance was significantly better than that of traditional welded joints, with an 18% increase in energy dissipation. Based on the test study, a double-hinged joint with multistage resistance was constructed. Specifically, a tie member was installed in the middle of the connecting region. It does not participate in the joint loading in the early stage but provides a strong axial tensile force in the later stage, thereby achieving the effect of multistage resistance. Employing the topology optimization method, rational construction measures for the tie region were proposed, thereby clarifying the configuration of the joint. After this, considering the multistage resistance, a simplified load-displacement relationship for the joint was established via theoretical analysis, enabling the quantitative calculation of the aseismic and anti-collapse performance. A simulation method validated by the tests was employed to analyze the aseismic and anti-collapse performance. The analysis results indicate that the gap at the end of the tie member significantly affects the joint performance. While fully utilizing the load-bearing capacity of the steel beam, the joint still retains the capability for recoverability after an earthquake.

     

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