Splice connection, comprised of splice plates and slip-critical high strength bolts, is an efficient and convenient connecting technique for modular buildings. Previous investigations on this splice connection were mainly conducted based on tests of substructures, which may not reveal the real connection behavior in the whole modular building. To fill this research gap, this paper presents a comprehensive research on a full-scale corner-supported modular building assembled with splice connections. Behavior of the splice connection during the transfer of vertical load in the full-scale modular building is analyzed in details with combined experimental and numerical techniques. Test results showed that no unfavorable phenomenon was caused by the proposed splice connection before the global buckling of the module column. Based on the validated numerical model, a three-stage behavior during the entire loading process is found for the splice connection. The involvement of splice connection in the transfer of vertical load is negligible in the first stage while the splice connection provides sufficient constraint for the second-order moment at the bottom of module column in the second stage. The localized deformation and obvious formation of gap are found in the third stage. However, the analysis on the full-range bolt pre-tension force of the bolt group indicates that the origin of such negative phenomenon is located after the global buckling, which will not affect design on the vertical-load transfer performance of the module column. The sensitivity of connection behavior to the values of initial imperfections are also investigated by the parametric study. It is found that the proposed splice connection has a satisfactory tolerance for extreme initial imperfections. A transitional initial imperfection is further proposed, which may be used as an important reference for the practical control on the initial imperfection.

拼接连接由拼接板和高强度滑动关键螺栓组成，是一种用于模块化建筑的高效便捷的连接技术。先前对这种接头连接的研究主要基于子结构的测试，这可能无法揭示整个模块化建筑中的实际连接行为。为了填补这一研究空白，本文对由角码连接的全尺寸角支撑模块化建筑进行了全面的研究。利用组合的实验和数值技术，详细分析了全尺寸模块化建筑中垂直荷载传递过程中的接头连接行为。测试结果表明，在模块柱整体屈曲之前，建议的接头连接不会引起不良现象。基于已验证的数值模型，发现接头连接在整个加载过程中具有三个阶段的行为。在第一阶段中，接头连接在垂直载荷传递中的参与可忽略不计，而在第二阶段中，接头连接为模块柱底部的二阶矩提供了足够的约束。在第三阶段发现局部变形和明显的间隙形成。但是，对螺栓组的全范围螺栓预紧力的分析表明，这种负现象的根源位于整体屈曲之后，这不会影响模块柱的竖向荷载传递性能的设计。参数研究还研究了连接行为对初始缺陷值的敏感性。发现所提出的接头连接对于极端的初始缺陷具有令人满意的公差。提出了过渡性的初始缺陷，可以作为实际控制初始缺陷的重要参考。