Abstract
This work deals with investigating the capacity of high strength columns, under axial compression loads. A total of nine circular column with 600 mm length and 150 mm outer diameter were tested, three of them were solid as a reference, the remaining six columns were with internal hole of 50 and 75 mm dimeter. The effect of hole size as well as area of longitudinal steel reinforcement was studied. Area of steel used where 0, 301 and 471 mm2 and two hole size were 50 and 75 mm. The results showed that the increasing of longitudinal reinforcement ratio from 0 % (plain) to 2.67% (steel reinforcement area of 471 mm2) for solid column cause an increase in the ultimate strength by 33.6%, while for hollow columns with 75 mm internal hole the ultimate strength increased up to 33.2 %. Increase in hole dimeter from 50 to 75 mm caused a reduction of columns capacity in all cause, the decrease was up 33 % for columns with 301 mm2 steel area was up to 32 %, for columns with 417 mm2
Highlights
Reinforced concrete is the most used material for construction of building
This study investigates the effect of using different longitudinal steel reinforcement areas
Three columns without steel reinforcement (Plain) (S-00-00, H-00-50 and H-00-75) have been tested under axial compression load, and results were listed in Table (3).The axial load capacity decreased, when the size of hole increase from 0 to 75 mm, the decreased percentage was 26.8 and 33.2 % for size of holes 50 and 75 mm respectively, as compared with the reference S-00-00
Summary
Reinforced concrete is the most used material for construction of building. High strength concrete (HSC) is considered as an advantage, the advantage is due to easy to cast in needed shapes. The high strength concrete achieves less size and weight of structures members. Using of high strength concrete instead of normal concrete (NC) is demand for high rise building for the purpose of small dimensions members. The high strength concrete achieves less deflection and more ductility which give warning before collapse more than the normal concrete. [1] Adopting hollow columns in structurer will minimize the cost of construction via reducing the size and weight of concrete members. The high strength concrete hollow columns produce less weight on foundation which leads to minimize the dimensions and cost off foundation. [3] In this research two types of column were used solid and hollow, with two size of holes and three longitudinal steel area The high strength concrete hollow columns produce less weight on foundation which leads to minimize the dimensions and cost off foundation. [3] In this research two types of column were used solid and hollow, with two size of holes and three longitudinal steel area
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