装配式轻型钢管混凝土框架-不同构造内藏钢板组合墙结构抗震试验

为提高村镇住宅的抗震性能，提出了一种装配式轻型钢管混凝土框架-内藏钢板组合墙结构。该结构由轻型钢管混凝土框架和内藏钢板组合墙组成。为研究不同构造内藏钢板组合墙对该结构抗震性能的影响，进行了4个足尺试件的低周反复荷载试验，比较了试件破坏特征、承载力、滞回性能、刚度退化、耗能能力等。采用“混合拉-压杆模型”对内藏钢板组合墙进行简化，并基于OpenSEES软件对轻型钢管混凝土框架-内藏钢板组合墙结构进行推覆模拟。研究表明：内藏钢板组合墙可显著提高钢管混凝土框架的承载力；钢筋暗支撑提高了内藏钢板组合墙的承载力，减缓了刚度退化并增加了耗能能力；“混合拉-压杆模型”较好地考虑了内藏钢板混凝土组合墙的受力特性，计算结果与试验结果吻合较好，可用于此类组合墙受力分析。

Experimental study on seismic performance of assembly structure of lightweight CFST frame-embedded steel plate composite wall with different constructions

In order to improve the seismic performance of rural buildings, an assembled lightweight concrete filled steel tubular (CFST) frame-embedded steel plate (ESP) composite wall structure is proposed. The structure is composed of lightweight CFST frame and ESP composite wall. In order to study the influence of different constructions of ESP composite walls on the seismic performance of the structure, 4 full-scale specimens were tested through reversed cyclic lateral loading. The failure characteristics, load-bearing capacity, hysteretic property, stiffness degradation and energy dissipation were compared. A “hybrid strut-and-tie model” was used to simplify the ESP composite wall, and the Pushover analysis of the lightweight CFST frame-ESP composite wall structure was carried out using OpenSees software. Results show that the ESP composite wall can significantly improve the bearing capacity of CFST frame. The rebar brace improves the ultimate bearing capacity, reduces stiffness degradation and increases the energy dissipation. The “hybrid strut-and-tie model” is able to reasonably take into account the mechanical characteristics of the ESP composite wall, and the simulation results are in good agreement with the experimental results, which validates that this model can be used for analysis of similar composite wall system.