Research On Hysteretic Behavior Of Energy-efficient Castellated Steel Pillar

With energy crisis growing， building energy consumption and environmental issuesbecoming increasingly prominent, the promotion of green energy-efficient building hasbecome an inevitable choice for China’s sustainable development strategy. Compared with thepre-processed solid web steel pillar, energy-efficient castellated steel pillar not only improvesthe bearing capacity, but also consumes less material and has less weight. Besides, it can saveenergy by its excellent thermal performance. Therefore, this study is of huge significance forbuilding energy conservation technology theory and practicing, and has a great value forpromotion, popularization and application of castellated steel pillar in China.For guaranteeing the accuracy, this study refers to previous researching methods andresults about castellated steel components, especially castellated steel pillar, utilizessimulation software ANSYS to create models with different expansion ratio K and differentslenderness ratio and to do nonlinear finite element analysis response to their hystereticbehavior under level low-cycle loading. Then, certain rule about hysteretic behavior’s changesbetween the pre-processed original solid web steel pillar and energy-efficient castellated pillaris drawn. Meanwhile, the influence which the expansion ratio and slenderness ratio impact onenergy-efficient castellated steel pillar’s hysteretic behavior is shown. The results show that:the hysteresis loops of castellated steel pillar are more plump than those of correspondingsolid web steel pillar; the yield bearing capacity and ultimate bearing capacity of castellatedsteel pillar are higher than those of corresponding solid web steel pillar; the stiffnessdegradation rates of castellated steel pillar and corresponding solid web steel pillar in the caseof level low-cycle loading are similar; the ductility of castellated steel pillar is relatively poor,but energy-consuming performance of castellated steel pillar is relatively good; theappropriate range of expansion ratio is1.5to1.6, and the better range of slenderness ratio is 90to100; the plastic hinge of castellated steel pillar is at the cross-section of the lowest hole’sbottom because of the pillar’s maximum stress locating here, the flange’s corresponding part’sbuckling occurring here and causing the bearing capacity declining rapidly, so it isrecommended that the stiffening measures should be set at the site of the plastic hinge.In summary, comparing to the pre-processed original solid web steel pillar, not only thestability bearing capacity of energy-efficient castellated steel pillar has been enhanced, butalso its hysteretic behavior is improved. Additionally considering its material-savingcharacteristic and good thermal performance, the energy-efficient castellated steel pillar willhave broad prospects for development, and it is bound to be widely used in future projects.