Experimental Study Of Reinforced Concrete Columns Concealing Rain Water Pipe

Abstract

Suatu kajian bereksperimen telah dijalankan untuk menentukan kesan paip air hujan tersembunyi di dalam tiang konkrit bertetulang dalam bangunan bertingkat. Sebanyak empat belas tiang telah diuji dalam tujuh set dengan saiz dan tetulang yang berbeza dengan satu paip saliran PVC yang terletak di tengah keratan rentas setiap satunya. Satu kaedah penghampiran penjajaran tiang juga telah dibangunkan dan jajaran tiang yang dibina telah dijalankan sebelum memulakan uji kaji. Kekuatan muktamad yang diperoleh dari uji kaji ini telah dibandingkan dengan kekuatan reka bentuk yang disarankan oleh kod amalan British (BS 8110) dan kod amalan Amerika (ACI). Tiang menunjukkan kemerosotan ketara dalam kapasiti menampung beban dan faktor keselamatan yang didapati adalah jauh lebih kurang daripada nilai nominal yang disarankan oleh kebanyakan kod amalan. Kata kunci: Tiang konkrit bertetulang, kapasiti menampung beban, paip saliran, tegasan, keterikan, faktor keselamatan An experimental study has been carried out to investigate the effect of concealing rain water pipes inside reinforced concrete columns in multistorey buildings. Fourteen columns in seven sets, having different sizes and reinforcement, with a PVC drain pipe positioned at the centre of crosssection of each one of them have been tested. An approximate method of columns’ alignment has also been developed and the alignment of the constructed columns has been carried out before their testing. The ultimate strength of the columns obtained from the present investigation have been compared with the design strengths recommended by the British code of practice (BS 8110) and the American code of practice (ACI). The columns showed significant reduction in their load carrying capacities and the safety factors obtained were much less than the nominal value usually recommended by various codes of practice. Key words: Reinforced concrete column, load carrying capacity, drain pipe, stress, strain, factor of safety