Finite Element Analysis of Castellated Beam Maximum Moment Capacity

In order to further get to know maximum moment capacity of castellated beams,this paper will use finite element analysis program-ANSY here to analyze the circular and polygon holes' castellated beams with the same span and the same number of openings,and then to obtain different opening section and different ratio's influence on the castellated steel beam's moment capacity.As to the two different kinds of sections,the strength of circular castellated beams will be huger than that of polygon castellated beams with the same condition.The result shows that the influence of the opening ratio's and section on the castellated beams can be simulated by use of the finite element analysis program.At the same opening ratio's,beams will reach the elastic phase ,then the elastic-plastic at the last phase of plasticity.At the same time,plasticity will develop the opening section and circumference.The web shows the bulking phenomenon.It expresses that the beam reaches the ultimate failure,and then causes the lateral tort at the middle of beam and loses the overall stability.There are stress concentrations on the corner of the opening.The finite element maximum moment capacity of circular castellated beams are higher than that of the polygon castellated beams with the increasing of opening ratio.