连续梁的塑性承载力及变形能力研究

Research on Plastic Bearing Capacity and Plastic Deformation Capacity of Continuous Beam

影响连续梁塑性变形及塑性承载力大小的因素很多,如截面形式、跨度、加载荷载方式、跨长比等,这些影响在确定塑性承载力时是不能忽视的。对比了在不同加载方式及跨长比时,连续梁的极限承载力和变形能力。结果显示,等跨单边加载与双跨加载时两者极限荷载相等,但单跨加载,达极限荷载时挠度大于两跨加载。连续梁跨度相差较大时,其极限承载力降低,对承载不利。且达极限承载力时,塑性变形能力也加大。

There ′re many factors that influence the plastic deformation and the plastic bearing capacity of continuous beam,such as cross section shape,span and loading condition etc.These effects cannot be ignored in the determination of the plastic bearing capacity.The plastic bearing capacity and corresponding plastic deformation of continuous beam under different loading ways and different span ratio are contrasted.The results showed that the ultimate loading are equal when the continuous beam with equal span unilateral loading and double cross loading.But the deflection of single span loading is bigger than two cross when loading.And the bigger of the continuous beam span ratio,the lower limit bearing capacity,and the worse of structure bearing capacity,and of ultimate bearing capacity,the plastic deformation ability is bigger also.