Crack Calculation of Beams from Self-Compacted Concrete

The latest developments of construction of high rise buildings like skyscrapers and different towers indicate that building such constructions with conventional concrete of low consistency is impossible due to the hard concreting process, mounting/demounting of scaffolding and the duration of concrete curing. Lately the most widely used material for construction of special buildings is self-compacting concrete because of the ability to fill entire section of formworks without compaction and vibration and better homogeneity between concrete and reinforcement. With massive USAge of Self Compacted Concrete (SCC) in special buildings, series of researches are conducted all over the world analyzing cracks, mechanical characteristics and deformations of SCC. These researches shows that calculation of concrete elements with normal concrete do not give adequate results according to EC2 because of the concrete class consistency and amount of reinforcement in the cross section. The SCC as raw material provides better results in term of concrete consistency gives better cross section homogeneity and it is vibration free. However SCC concrete cracks, deformations, creep, deflections are different than normal concrete and as such must be calculated and analyzed before application. In this paperwork we have presented calculation of cracks on long term process of SCC beam element after period of t=400 days from concreting and comparison of results with the theoretical ones in line with Eurocode 2 (EC2) requirements

Explosions, Abnormal Loads on Structures

In Kosovo as well as in many countries of the world have occurred explosions in objects, so this research have addressed the ways and possibilities of protecting the buildings by using their position as construction and design elements\u27 after you load resisted by explosions. This paper presents basic information on the approaches for the evaluation of the blast effects on the structures. Motivation for the present study is recent events happening in the World where more and more structures are being destroyed by unexpected explosions in the urban areas. Intension of this investigation is to present basic information on what will happen when an explosive device is detonated. Some of the methods to calculate blast loads are presented. At the end it is presented simple method of designing a reinforced concrete wall barrier subject to a blast load caused by vehicle bomb. Calculation has been carried based on the kinetic energy that is delivered on the surface of the wall and that energy dissipation by the wall to resist such impulse load