Study of Short Column Behavior Originated from the Level Difference on Sloping Lots during Earthquake (Special Case: Reinforced Concrete Buildings)

Abstract

The disorders originated from architectural design in buildings, show in different forms. One of them is the level difference originated from lot's slope which affects structures through short column phenomenon. The great stiffness of short columns enables them to absorb large amounts of structural energy. Inattention of some manuals and regulations such as Earthquake regulations to this phenomenon necessitates paying further attention to it. On this basis, the present study employed experimental modeling and numerical modeling for a four-story reinforced concrete building that involves the analysis of simple 2-D frames of varying floor heights and varying number of bays using a very popular software tool STAAD Pro on both a sloping and a flat lot. Also Sap2000 software had been used to show that the displacement of floors is greater for a flat lot building than a sloping lot building. However, the increase in shear was found to be quite greater in short columns compared to common ones and an enormous moment should be tolerated by sloping lot structures. The greater stiffness of the structure was also revealed by non-linear static (Push-Over) analysis. According to the results, short column are required to have more resistant sections and are suggested to be reinforced with more bars. In addition, more steel should be used as stirrups than as longitudinal bars. Also for existing structures, shear capacity of short columns should be retrofitted by FRP, Steel Jacket or other materials.

Finite element modeling of reinforced concrete short columns subjected to shear in two perpendicular directions

“…The results showed that short columns had an increased stiffness and shear due to their short height, this increase in stiffness led to a reduction in the relative displacement of the floor which then affected the entire structure. Ramin and Mehrabpour (2014) recommended the use of steel in columns to increase the resistance, also more stirrups should be used rather than longitudinal bars. Furthermore, for present structures, shear capacity of short columns should be improved by FRP, Steel Jacket or any appropriate materials.…”

“…Ramin and Mehrabpour (2014) carried experimental and analytical studies on the short column behavior during an earthquake. These studies were performed on two four-story RC buildings that were completely symmetric and similar to each other.…”

“…Moreover, to get improved hysteretic behavior in terms of response to degradation and dissipation of energy, large bar diameters and the high ratio of longitudinal reinforcement should be avoided. Ramin and Mehrabpour (2014) carried experimental and analytical studies on the short column behavior during an earthquake. These studies were performed on two four-story RC buildings that were completely symmetric and similar to each other.…”

Thermal and Mechanical Analyses of Clamping Area on the Performance of Press-Pack IGBT in Series-Connection Stack Application

“…7(b) due to the thickness 2Hh becoming larger, equal to 50 mm. By analogy to the short columns of structural member, the column is a lot thicker and can bear higher compressive stress [35].…”

Multiple Linear Regression Modelling for Predicting Building’s Short Columns Loads under Gravity

“…Most of these studies investigated the effect of slope angle variation for the structures resting on sloping ground under the seismic condition. Ramin and Mehrabpour [8] found that in short columns under earthquake, because of their shorter height, a considerable increase in stiffness of their section is observed while the percentage of shear force absorption and bending moment rises. Singh et al [9] concluded that under along-slope excitation, the varying heights of columns cause International Journal of Engineering Research and Technology.…”