基于钢牛腿连接的可拆卸混凝土梁柱 L 型节点抗震性能分析

Research on Seismic Performance of L-Shaped Joint in Demountable Concrete Column-Beam Based on Steel Corbel Connection

摘要

当前装配式结构通常不可拆卸并重复利用，为此一种基于钢牛腿连接的可拆卸装配式混凝土框架结构被提出。为探究其 L 型节点的抗震性能，通过 Ansys 有限元模型分析了其在柱顶水平往复荷载和梁端竖向往复荷载下的滞回行为及损伤过程。结果表明，L 型节点表现出良好的耗能能力和延性，节点核心区变形主要由组件的塑性变形和组件间的相对滑移变形组成。主要的破坏模式为钢牛腿的弯曲、剪切破坏及节点核心区的剪切破坏。为保证节点抗震性能，钢楔强度应大于钢牛腿强度。适当提高钢牛腿、混凝土或钢楔的强度可增强节点的抗震性能，增大轴压比对节点的耗能能力有小幅提升。最后，给出了 L 型节点参数的建议设计值。

Abstract

Conventional prefabricated structures generally lack demountability and reusability. Threrfore，a demountable precast concrete frame structure based on steel corbel connections was proposed.To investigate the seismic performance of its L-shaped joint.The hysteretic behavior and damage process under cyclic horizontal loading at the column top and cyclic vertical loading at the beam end were analyzed using Ansys finite element model.The results indicate that the L-shaped joint exhibit favorable energy dissipation capacity and ductility.The deformation in the joint core area primarily consists of plastic deformation of components and relative slip deformation between components. Primary failure modes include bending and shear failure of the steel corbel，as well as shear failure in the joint core area.To ensure the seismic performance of the joints，the strength of the steel wedge should exceed that of the steel corbel.Appropriately increasing the strength of the steel corbel，concrete，or steel wedge can enhance the seismic performance of the joints.Increasing the axial compression ratio slightly improves the energy dissipation capacity of the joints.Finally，recommended design values for L-shaped joint parameters are provided.

关键词

可拆卸预制混凝土节点 / 抗震性能 / 钢牛腿 / 有限元分析 / 循环荷载 / L 型节点

Key words

demountable precast concrete joints / seismic performance / steel corbel / finite element analysis / cyclic loading / L-shaped joint

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