Comparison of Progressive Collapse in Moment Connections with Low-strength Steel

The performance of beam – column  connection of common steel moment frames has been evaluated in a seismic discuss and progressive collapse alone. After the Northridge and Kobe earthquake, researchers found that the connections were weak. This is while the connections have a huge impact on the process of energy depletion of structure and structure behavior against unusual loads; Because if the panel zone is weak, even in the case of performing a rigid connection with resistance of more than beam which causes failure in the connection area, it causes a large deflection and resulting in a brittle fracture of connection. In this regard, in the current study, the performance Two common types of WFP bending (welded flange plate connection) and WUF-W (welded unreinforced flange-welded web connection) against a progressive coolapse phenomenon have been investigated by changing the type of steel used in plate for this purpose. The purpose of these two types of connection is once with St 37 and once with a steel alloy steel LY160, in a frame 8 steel story with different scenarios, Column removal (without remove the column, removing the column of the ground floor, third and seventh) was simulated in ABAQUS software. The results show that the DCR (criterion which is the Demand Capacity Ratio and it is also called the demand factor) value in the WUF-W connection is much lower by replacing the alloy steel.