In order to significantly increase not only the load carrying capacity but also the ductility of existing circular
concrete columns, a method to strengthen the columns with ferrocement including steel bars (FS)
jacket was proposed. To evaluate the behaviour of the FS strengthening columns more objectively and
thoroughly, a comparatively experimental study on uniaxial compression behaviours of concrete columns
wrapt with three different confining systems, namely bar mat-mortar (BM), FS, and fibre reinforced
polymer (FRP), was carried out. Fifty-one specimens were produced. The load–strain responses, failure
modes, ultimate loads and ductilities of various strengthened columns were investigated. The experiment
results showed that the mortar cover crack spaces of FS columns were basically equal to the wire mesh
spacing, leading to the occurrence of much more cracks compared with that of BM columns. As a result,
on the premise that the concrete compressive strength of the FS columns increased 30% compared with
that of the BM columns, the ductility of the former reached about twice as that of the latter. When the
confined concrete strength of FRP strengthened columns was similar to that of FS strengthened columns,
the ductility, energy absorption capacity and deformation capacity of the former were obviously lower
than those of the latter. In the light of a formula for calculating the ultimate load of concrete-filled steel
tube (CFST), an empirical formula for predicting the ultimate load of the FS strengthened concrete column
was proposed. The calculation results by using the proposed formula show a good agreement with the
test results
In order to significantly increase not only the load carrying capacity but also the ductility of existing circularconcrete columns, a method to strengthen the columns with ferrocement including steel bars (FS)jacket was proposed. To evaluate the behaviour of the FS strengthening columns more objectively andthoroughly, a comparatively experimental study on uniaxial compression behaviours of concrete columnswrapt with three different confining systems, namely bar mat-mortar (BM), FS, and fibre reinforcedpolymer (FRP), was carried out. Fifty-one specimens were produced. The load–strain responses, failuremodes, ultimate loads and ductilities of various strengthened columns were investigated. The experimentresults showed that the mortar cover crack spaces of FS columns were basically equal to the wire meshspacing, leading to the occurrence of much more cracks compared with that of BM columns. As a result,on the premise that the concrete compressive strength of the FS columns increased 30% compared withthat of the BM columns, the ductility of the former reached about twice as that of the latter. When theconfined concrete strength of FRP strengthened columns was similar to that of FS strengthened columns,the ductility, energy absorption capacity and deformation capacity of the former were obviously lowerthan those of the latter. In the light of a formula for calculating the ultimate load of concrete-filled steelหลอด (CFST), สูตร empirical การคาดการณ์การผลิตที่ดีที่สุดของคอลัมน์คอนกรีต strengthened FSมีการนำเสนอ ผลการคำนวณ โดยใช้สูตรเสนอแสดงข้อตกลงที่ดีกับการผลการทดสอบ
การแปล กรุณารอสักครู่..
