Reasonable Selection of Wide Beam Sizes Based on Deflection Conditions According to the ACI 318 2002 Standard in Multi -Storeyed Buildings

In multi-storeyed buildings, if we select section of the beam according to traditional methods to ensure reliability and deflection, we will have beams with considerable height to overcome the large span; therefore, buildings are very high. On the other hand, some economic and aesthetic conditions will not meet the requirements.Thus, people need to research into calculation methods to have a reasonable choice of beam section so that the height of beams can be reduced to the minimum value and the beam still satisfies all the requirements of deflection and strength. Concept of wide beam appears based on the above ideas. This paper presents the calculation method of the deflection of wide beams according to the US ACI 318-2002.standard. This method is based on controlling of beam height, then, beam width is chosen to ensure standards of deflection in multi-storeyed buildings