دانلود رایگان مقاله انگلیسی تحلیل عملکرد سازه های فولادی با بی نظمی های A3 - اشپرینگر 2018

Abstract

Determination of the behaviour of structures during earthquakes is a very important engineering concern. Irregularities in the structure may lead to more damage imposed on it by weakening its defence mechanism during an earthquake. Some of these irregularities may be indentations or protrusions in the plan. Such irregular buildings may be encountered in practice because of various reasons. This study examined the state of irregularity by the A3 plan in the Turkish Building Earthquake Regulation of 2016. Four diferent A3-type irregularity cases were considered. The building with no irregularities in its plan was taken as the reference building. The fve steel structures were compared by obtaining pushover curves for both the X and Y directions. Additionally, as a rapid assessment method, the Canada Seismic Screening Method was used in the study. Both in the rapid assessment method and from the pushover curves, it was determined that buildings without irregularities are safer. The study also allows a comparison among the earthquake performances of the structures using the rapid assessment method. It may be stated that there was an agreement between the two methods. This shows that the rapid assessment method may be used for steel structures. The importance of constructing structures that do not include irregularities is emphasized with the study. If one has to construct such structures, the defence mechanism of the structure should be strengthened by taking various measures.

6 Conclusions

This study, focused on irregularities in the plan of a structure among negative parameters that may damage it. Information was provided about the irregularities that may be found in a structure.

This study examined states of the irregularity based on A3 plan in the Turkish Building Earthquake Regulation. The cases of indentation and protrusion in the structure were examined separately by modifying the foor pattern plan of a selected steel structure. Pushover curves were obtained for the selected plans. The results were obtained, and recommendations were made.

Since the Type 3 and Type 4 plan irregularity areas were very close to each other, the pushover curves were very close to each other in both directions. Irregularity in a construction plan reduces the performance of the construction in several ways. As the irregularities change in the X and Y directions, the base slicing forces also change.

According to the results obtained by applying the Canadian Seismic Scanning Method, which is a rapid evaluation method, the irregularity state in the plan is afected the defensive mechanism of the structure negatively. In this method, there is no value of where the irregularity state in the plan is. A single value is recommended for each irregularity in the plan. However, the static pushover curves show the importance of where the irregularity in the plan is.

As the vulnerability of structures increases under earthquake efects the amount of damage that can occur also increases. In this context, this emphasizes the importance of building design and regulation provisions. Structural systems that do not contain irregularities, designed in compliance with regulations and are efectively quality-controlled during the construction stage can display ductile behaviour even in a very severe earthquake, thereby achieving damage within acceptable boundaries. It is necessary to avoid negativity parameters that are found and will be found in both the design and construction stages. Each negativity will adversely afect the defence mechanism of the structure against earthquakes.