000			02466aab a2200253 4500
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022			_a0889-3241
100			_aJulian D. Rincon _9882119
100			_aYu-Mei Chen _9882120
100			_aSantiago Pujol _9882121
100			_aAishwarya Y. Puranam _9882122
100			_aShyh-Jiann Hwang _9881918
245			_aShear Strength of Reinforced Concrete Columns with External Post-Tensioned Clamps
300			_a111-126 p
520			_aAn alternative method to retrofit reinforced concrete (RC) columns with insufficient shear reinforcement is investigated. The retrofit involves external prestressing of the columns in the transverse direction to increase both shear strength and drift capacity. External post-tensioned clamps, consisting of high-strength steel rods connecting a set of steel angles, were applied around the columns at different spacings and initial post-tensioning stresses. The tension induced in the steel rods exerts lateral confining pressure on the column by bearing of the angles against the corners of the column. Ten RC columns furnished with external post-tensioned clamps were tested under cyclic loads and approximately constant axial loads. In addition, six RC beams with clamps were tested under monotonically increasing loads. Both the column and beam specimens were fabricated with no transverse reinforcement in the form of conventional steel ties. Therefore, the external clamps were the only source of reinforcement resisting shear. The lateral prestress provided by the clamps was observed to increase the shear stress at the formation of the first inclined crack and at failure. As a result, the mode of failure of columns vulnerable in shear changed from shear failure to a more ductile failure dominated by flexure. The observed increase in shear strength is dependent on the lateral prestress and the tensile strength of the concrete. A simple equation, based on the mechanics of materials, is presented to calculate the shear strength of RC columns with external prestressing.
650			_aExternal Post-Tensioned Clamps _9882123
650			_aLateral Prestress _9882124
650			_aReinforced Concrete (RC) Columns _9882125
650			_aRetrofit _9171931
650			_aShear Strength
773	0		_dFarmington Hills,MI, U.S.A : American Concrete Institute _tACI Structural Journal _x08893241
856			_uDOI:10.14359/51740248
942			_2ddc _n0 _cART _o14993 _pMr. Muhammad Rafique Al Haj Rajab Ali (Late)
999			_c815201 _d815201