模块化钢结构全装配螺栓-角件节点抗震性能研究

Investigation on seismic performance of the fully prefabricated bolted corner-fitting connection for modular steel structures

摘要

模块化钢结构作为预制程度最高的装配式建筑，以其施工效率高、环境污染小等优点，逐渐成为我国建筑工业化发展的重要方向。模块间节点对模块化钢结构抗震性能具有重要影响，然而，当前针对易于装配的模块间节点研究较少。本文提出一种模块化钢结构全装配螺栓-角件连接节点(fully prefabricated bolted corner-fitting connection，FPBCC)，系统研究其初始刚度和抗弯承载力等性能指标的计算方法。开展了4个足尺试件的抗震性能试验，得到了FPBCC在循环荷载作用下的破坏模式、滞回曲线和耗能能力，讨论了梁截面、梁端削弱和梁柱连接方式对其抗震性能的影响。建立了FPBCC精细有限元分析模型，并通过与试验结果对比验证了模型的准确性。分析了梁截面、柱截面和螺栓强度等关键参数对FPBCC抗震性能的影响规律。推导了FPBCC节点初始刚度和抗弯承载力的理论公式并且建立了其恢复力模型，采用试验和参数分析结果验证了所推导理论公式的准确性。研究结果表明，增大梁截面后节点平均最大承载力提高42.8％，但平均延性降低13.8％，说明梁截面增大可提高承载能力，但会削弱节点变形能力；梁端削弱可使梁端更早进入屈服并参与耗能；有限元模型预测峰值承载力与试验结果的比值平均值为1.04，变异系数为0.06；所提出的初始转动刚度和峰值承载力计算公式预测误差均在15％以内，计算结果整体偏于安全，可为该类模块间连接节点的工程设计提供参考。

Abstract

As one of the most highly prefabricated forms of assembled buildings, modular steel structures have gradually become an important development direction of building industrialization in China due to their high construction efficiency and low environmental impact. Inter-module connections have a significant influence on the seismic performance of modular steel structures. However, research on easily assembled inter-module connections is still limited. A fully prefabricated bolted corner-fitting connection (FPBCC) for modular steel structures was proposed, and the calculation methods for its initial rotational stiffness and flexural bearing capacity were systematically studied. Quasi-static cyclic tests were conducted on four full-scale specimens to investigate the failure modes, hysteretic curves, and energy dissipation capacity of the FPBCC, and the effects of beam section, beam-end weakening, and beam-column connection type on its seismic performance were explored. A refined finite element model of the FPBCC was established and validated by comparing with the test results, and the effects of key parameters, including beam section, column section, and bolt strength, on the seismic performance of the FPBCC were analyzed. Analytical formulas for the initial rotational stiffness and flexural bearing capacity of the FPBCC were derived, and a restoring force model was established. The validity of the proposed formulas was verified by comparison with the test and parametric analysis results. The results indicate that, compared with the reference specimen, increasing the beam section increased the average peak load-carrying capacity by 42.8%, while decreasing the average ductility by 13.8%. Beam-end weakening promoted earlier yielding of the beam and contributed to energy dissipation. The mean ratio of the peak load-carrying capacity predicted by the finite element model to the test results was 1.04, with a coefficient of variation of 0.06. The prediction errors of the proposed formulas for the initial rotational stiffness and peak load-carrying capacity were within 15%, and the predictions were generally conservative, indicating that the proposed formulas can provide a reference for the engineering design of such inter-module connections.

关键词

模块化钢结构 / 全装配螺栓-角件连接节点 / 抗震性能 / 有限元分析 / 理论分析

Key words

modular steel structure / fully prefabricated bolted corner-fitting connection / seismic performance / finite element analysis / theoretical analysis

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基金资助

河南省自然科学基金项目(242300421177)

国家自然科学基金项目(52378206)

河南省科技研发计划联合基金项目(235200810013)

河南省重点研发与推广专项(252102321146)