ABSTRACT

Mechanical joints for both irregular steel-concrete composite precast frames and reinforced concrete precast frames were developed to replace conventional cast-in-place concretes in the previous study of the authors. Novel connections modified from conventional steel joints having fully restrained moment connections offer rapid and facile erections. This study aims to numerically identify microscopic strain evolution and failure modes of the laminated metal plates splicing L-shaped precast composite columns. Numerical parameters including material properties of structural components of mechanical joint were implemented to determine damages and strength degradations with associated fractures. Comprehensive numerical results agreed well with test data, which explored structural behavior and contribution of each structural element of mechanical joint to flexural capacity. Strain evolution showed that degradation of the mechanical joints was retarded by interior bolts to a level similar to monolithic columns, resulting in contribution of mechanical joint to flexural capacity of columns. Influence of axial loads on the behavior of columns with mechanical joints was also evaluated to provide design recommendations.

摘要

在作者之前的研究中，开发了用于不规则钢-混凝土复合预制框架和钢筋混凝土预制框架的机械接头，以取代传统的现浇混凝土。由具有完全约束力矩连接的传统钢接头改进的新型连接提供快速和轻松的安装。本研究旨在数值识别叠层金属板拼接 L 形预制复合柱的微观应变演变和失效模式。实施了包括机械接头结构部件的材料特性在内的数值参数，以确定与断裂相关的损伤和强度退化。综合数值结果与测试数据吻合良好，其中探讨了机械接头的每个结构元件的结构行为和对抗弯能力的贡献。应变演化表明，内部螺栓将机械接头的退化延迟到类似于整体柱的水平，从而导致机械接头对柱的抗弯能力的贡献。还评估了轴向载荷对带有机械接头的柱的性能的影响，以提供设计建议。