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 co More
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.
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The spread of an initial local failure from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it is defined as progressive collapse. Occurrence of events such as blast, firing, vehicle collision and err More
The spread of an initial local failure from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it is defined as progressive collapse. Occurrence of events such as blast, firing, vehicle collision and error in design calculations or construction could cause local damages to structures. Although prospect of progressive collapse is not considered in ordinary buildings, such incident could result in significant human casualties, economic losses, and security threats in buildings which fall into very high importance categories. In this paper progressive collapse analysis is briefly presented and then nonlinear behavior of a seven-story reinforced concrete building with special resisting moment frame designed against seismic loads is evaluated under progressive collapse in accordance with Unified Facilities Criteria, UFC4-023-03 code, based on alternate path method using SAP software. It is observed that the structure is unable to meet the requirements presented in the UFC. Thus, weak beams were strengthened in flexure by carbon reinforced polymer (CFRP) fabrics. Results of the analysis indicate that the adopted method greatly enhances continuity and strength in beams adjacent to the lost column and hence in plastic hinge development, remaining the damage to be local.
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Connections have a significant effect on the energy depletion of the structure and its behavior against unusual loads, which often lead to the phenomenon of progressive deterioration. Therefore, the effect of changing the mechanical and geometric characteristics o More
Connections have a significant effect on the energy depletion of the structure and its behavior against unusual loads, which often lead to the phenomenon of progressive deterioration. Therefore, the effect of changing the mechanical and geometric characteristics on the connections in steel moment frames against progressive failure has been studied in this research. In this regard, the variable parameters include the type of beam-to-column connection (reduced beam section connection or RBS, free flange connection FF), the type of steel used at the beam-to-column connection (St37 and Steel LY 160) and the column removal location in different stories (without removing and removing of the columns on the ground, second and fourth stories). Research on a six-story steel frame is performed using ABAQUS finite element software and alternative loads path method. Validation of the finite element method was performed using numerical simulation of a steel frame and a suitable fit was observed. The most important results present that in the frames where low-yielding steel is used at the connection point, the best performance in terms of demand-to-capacity ratio (DCR) of the beams around the removal location belongs to the Free Flange connection frames.
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Progressive collapse is a phenomenon that begins with initial local damage, due to unusual loading or design and construction errors, and leads to collapse of a large part or the entire structure. Of course, the progressive collapse phenomenon will rarely occur during t More
Progressive collapse is a phenomenon that begins with initial local damage, due to unusual loading or design and construction errors, and leads to collapse of a large part or the entire structure. Of course, the progressive collapse phenomenon will rarely occur during the useful lifetime of the structure. However, this issue can cause a lot of financial and life damage, thus it has become a major challenge in structural engineering. In this study, the structural models were steel plate shear wall with different configuration and moment frame systems with 5, 10 and 15 stories, which were designed in SAP2000 V.19 software two dimensionally according to code regulations and then the nonlinear dynamic analysis was performed in finite element ABAQUS software. The Alternate Path Method (APM) is used according to UFC4-023-03 guideline in this study, which is the most economical and rational method. Considering the displacement and rotation values of the members due to the column removal and the frame ductility, and failure damage indices, the most important results indicate that the probability of occurrence of progressive collapse due to the corner column removal of the 5-story moment frame is more critical than other frames and also, a proper and similar performance was observed due to the corner column removal in steel plate shear walls with the configurations examined
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