PUNCHING SHEAR IN REINFORCED CONCRETE FLAT PLATES UNDER ECCENTRIC LOADS:EXPERIMENTAL INVESTIGATION
Unbalanced moments and eccentric loads are commonly occurred in building with flat plates,resulted from unequal spans or loading on either side of the column.Usually,the most critical situation in the design of concrete flat plates is the design of slab – column connection.In this region the concentration of loads and moments can lead to punching shear failure.In this study,the behavior of flat slabs under concentric and eccentric load was investigated.Eight concrete flat plate specimens of dimensions(1500 x 1500 mm)were casted and tested in order to study the effect of several variables on the ultimate load capacity,central deflection of the slab,strains in flexural reinforcement and in concrete,area and perimeter of the failure zone and the value of the failure angle.The main variables which considered are the compressive strength of concrete 30 MPa or 60 MPa,the total thickness of the slab 100 mm or 130 mm and the position of applied load at 0 mm or 100 mm from the column center.The test results show a reduction in ultimate load by about(11.76-15%)due to the effect of eccentricity and unbalanced moments while the ultimate load increased by(17.24-36.36%)due to the use of high strength concrete which improves the punching shear resistance allowing higher forces to be transferred through the slab-column connection.This indicates that the use of high strength concrete increases the resistance of the slab to the unbalanced moments.On the other hand,when the slab thickness increased from 100 mm to 130 mm,the ultimate load increased by about(47-76%).
flat plate punching shear eccentric load concentric load self compacted concrete
Nazar K.Oukaili Luma F.Husain
College of Engineering,University of Baghdad,Iraq College of Engineering,University of Al-Mustansiriyah,Iraq
国际会议
新加坡
英文
1-4
2017-07-19（万方平台首次上网日期，不代表论文的发表时间）