17 Reinforced Concrete Design Design of （17个钢筋混凝土设计的设计）.pdf

Reinforced Concrete Design 17 Reinforced Concrete Design 17 Design of Column 1 Column load transfer from beams and slabs Type of Columns Strength of Short Axially Loaded Columns Column Failure by Axial Load Lateral Ties and Spirals Mongkol JIRAVACHARADET S U R A N A R E E INSTITUTE OF ENGINEERING UNIVERSITY OF TECHNOLOGY SCHOOL OF CIVIL ENGINEERING Tributary Area Tributary Area When loads are evenly distributed over a surface, it is often possible to assign portions of the load to the various structural elements supporting that surface by subdividing the total area into tributary areas corresponding to each member. Half the load of the table goes to each lifter. 6 m 2 3 m 2 Half the 100 kg/m snow load on the cantilevered 100 kg/m roof goes to each column. The tributary area for each column is 3 m x 3 m. So the load on each column is 100 (3 x 3) = 900 kg Column load transfer from beams and slabs 1) Tributary area method: Half distance to adjacent columns Load on column = area × floor load y y x x 6 m 6 m