5TH International Congress on Technology - Engineering & Science - Kuala Lumpur - Malaysia (2018-02-01)

Seismic Retrofit Of Flat Plate And Flat Slabs Using Ferrocement

This paper investigates the dynamic performance of ferrocement retrofitting of reinforced concrete flat slabs systems both experimentally and numerically. To do this end, commonly used three possible types of flat slab systems were made with low-strength concrete and tests were conducted in the lab. The aforementioned flat slab systems are as follows: flat plate, flat slab with column capital, and flat slab with column capital and drop panel. Over the last few decades, many buildings with flat slab systems have been constructed around the globe as well as in Bangladesh. However, there are many reasons to be worried with flat slabs and plate systems due to poor performances against heavy loading, punching shear failure, and dynamic loads such as earthquake. The mentioned issues may lead a structure in partial damage or collapse that might require retrofitting. Therefore, this study is motivated to observe the structural performance of abovementioned slabs, under seismic excitations and then retrofit the damaged structure by using ferrocement. The prototype models of those slabs were made with volumetric mix ratio of 1:2:4 (cement: fine aggregate: coarse aggregate). In a first step, all of the slabs have tested by employing scaled El Centro 1940 earthquake data in a shake-table and afterward, all of them were retrofitted with ferrocement. Finally, a numerical model was also developed by using SAP2000 to perform simulations. In a nutshell, both the experimental observations and numerical simulations stated that there is increased in the resistant capacity of slabs due to retrofit against earthquake. Keywords: Earthquake; Ferrocement; Low-strength concrete; Retrofit; Shake-table tests.
Mohammad S. Miah, Md Jihad Miah, M. M. Hossain, Suvash Chandra Paul