Experimental study on the X-shaped joints in the oblique crossing lattice of the China Petroleum Building

In order to study the mechanical behavior of the X-shaped joints in the oblique crossing lattice, four 1:5 scale models of the X-shaped joints are tested, and the corresponding numerical simulations are carried out using the ABAQUS software. The main parameters of the experiment are the volumetric percentages of stirrups in the joint core and the loading mode. The results of the test and the numerical simulation consistently show that in the loading process, the deflection of the joint core is insignificant. Once the load reaches the critical level, the models are damaged suddenly. The failure mode of the X-shaped joints is brittle. The equivalent loading mode and difference loading mode have minor influences on the critical load. The negative effect of the subsistent difference loading mode on the prototype structure can be neglected. Increasing the volumetric percentages of stirrups in the joint core can decrease the lateral expansion deflection of the joint core. When the minimum volumetric percentage of stirrups is more than 1.44%, the joint core is able to deliver the internal force effectively before the damage of the oblique column. The joint core is a good connection. The joint can meet the requirement of "strong joint, weak column".