Experimental investigation of the cyclic behavior of nodes in diagrid structures

The diagrid nodes that are designed to be installed in the Lotte Super Tower located in Seoul, South Korea were examined experimentally. This paper aims to investigate the cyclic behavior of the diagrid nodes under lateral loads, such as wind load or seismic load and to suggest the details and welding methods of nodes for application to an actual building based on test results. Two types of specimens were developed and tested cyclically. The PA type utilized an open-section layout for the node, whereas the PB type utilized a box-section layout for the node. Based on the test results, the cyclic performance for diagrid nodes was discussed with an emphasis on the initial stiffness, strength, and welding methods.