scholarly journals BOUT THE PROBLEM OF ANALYSIS RESISTANCE BEARING SYSTEMS IN FAILURE OF A STRUCTURAL ELEMENT

2018 ◽  
Vol 14 (3) ◽  
pp. 103-113 ◽  
Author(s):  
Anatoly V. Perelmuter ◽  
Oleg V. Kabantsev
Keyword(s):  
Progressive Collapse ◽  
Universal Method ◽  
Dynamic Amplification Factor ◽  
Dynamic Calculation ◽  
Structural Element ◽  
Load Bearing ◽  
Static Calculation ◽  
Dynamic Amplification ◽  
Bearing Structure ◽  
Bearing System

This paper focuses on the methods of calculating load-bearing systems in the case of a failure of a structural element. This kind of failure makes it necessary to assess further behavior of the structure with a possibility of the progressive collapse development. The stress-strain state analysis of a load-bearing system in the case of a failure of a structure is carried out by two main methods – static and dynamic calculation. It is shown that the static calculation (quasi-static analysis using the dynamic amplification factor) is not a universal method. This paper justifies the application of the direct dynamic calculation in the mode of direct integration of motion for the design analysis of load-bearing systems with high rigidity stories (protection structures for a load-bearing system). It also gives recommendations for selecting parameters of the direct dynamic calculation in the case of a failure analysis of a bearing structure.

scholarly journals Nonlinear behaviour of reinforced concrete flat slabs after a column loss event

2018 ◽  
Vol 21 (14) ◽  
pp. 2169-2183 ◽  
Author(s):  
Justin M Russell ◽  
John S Owen ◽  
Iman Hajirasouliha
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Progressive Collapse ◽  
Nonlinear Behaviour ◽  
Dynamic Amplification Factor ◽  
Element Analysis ◽  
Flat Slab ◽  
Standard Design ◽  
Loss Event ◽  
Dynamic Amplification

Previous studies have demonstrated that reinforced concrete flat slab structures could be vulnerable to progressive collapse. Although such events are dynamic, simplified static analyses using the sudden column loss scenario are often used to gain an indication into the robustness of the structure. In this study, finite element analysis is used to replicate column loss scenarios on a range of reinforced concrete flat slab floor models. The model was validated against the results of scaled-slab experiments and then used to investigate the influence of different geometric and material variables, within standard design ranges, on the response of the structure. The results demonstrate that slab elements are able to effectively redistribute loading after a column loss event and therefore prevent a progressive collapse. However, the shear forces to the remaining columns were 159% of their fully supported condition and increased to 300% when a dynamic amplification factor of 2.0 was applied. It is shown that this can potentially lead to a punching shear failure in some of the slab elements.

scholarly journals Dynamic Response and Robustness Evaluation of Cable-Supported Arch Bridges Subjected to Cable Breaking

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Guotao Shao ◽  
Hui Jin ◽  
Ruinian Jiang ◽  
Yue Xu
Keyword(s):  
Dynamic Response ◽  
Evaluation Method ◽  
Progressive Collapse ◽  
Bending Moment ◽  
Simulation Method ◽  
Dynamic Amplification Factor ◽  
Cable System ◽  
Evaluation Indexes ◽  
Dynamic Amplification ◽  
Arch Bridges

Cable-supported arch bridges have had many cable break accidents, which led to dramatic deck damage and even progressive collapse. To investigate the dynamic response and robustness of cable-supported arch bridges subjected to cable breaking, numerical simulation methods were developed, compared, and analyzed, and an effective and accurate simulation method was presented. Then, the cable fracture of a prototype bridge was simulated, and the dynamic response of the cable system, deck, and arch rib was illustrated. Finally, the robustness evaluation indexes of the cable system, deck, and arch rib were constructed, and their robustness was evaluated. The results show that the dynamic response of the adjacent cables is proportional to the length of the broken cable, while the dynamic response of the deck is inversely proportional to the length of the broken cable. The dynamic amplification factor of the cable tension and deck displacement is within 2.0, while that of the arch rib bending moment exceeds 2.0. The break of a single cable will not trigger progressive collapse. When subjected to cable breaking, the deck system has the least robustness. The proposed cable break simulation procedure and the robustness evaluation method are applicable to both existing and new cable-supported bridges.

Repairs of Steel Structures after Long-Term Use in Aggressive Environment

2016 ◽  
Vol 714 ◽  
pp. 213-220
Author(s):  
Štefan Gramblička ◽  
Tomáš Živner
Keyword(s):  
Nitrogen Fertilizer ◽  
Steel Structures ◽  
The State ◽  
Structural Members ◽  
Load Bearing ◽  
Original State ◽  
Aggressive Environment ◽  
Static Calculation ◽  
Bearing Structure

The article deals with the state of load-bearing structure of a hall which is exposed to effects of chemically aggressive environment during its use. Technology for production of nitrogen fertilizer is located in its premises. The structure was built in 1975 and, being adequately maintained, still remains in its original state. A detailed inspection of the load-bearing structural members, as well as a static calculation, was made between 2012 and 2015. The observed state of the structure and the results of calculations indicated that certain parts required strengthening. The article describes the means of strengthening which were proposed and used.

Analysis of test blanket module attachments under electromagnetic loads by using a dynamic amplification factor envelope

2018 ◽  
Vol 136 ◽  
pp. 1247-1251
Author(s):  
Raúl Muñoz ◽  
Francisco J. Calvo ◽  
Sergio Sádaba ◽  
Ana M. Gil ◽  
Javier Rodríguez ◽  
...  
Keyword(s):  
Amplification Factor ◽  
Dynamic Amplification Factor ◽  
Dynamic Amplification
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