【摘要】 为了探明部分填充混凝土圆形钢桥墩破坏机理和抗震性能,对部分填充混凝土圆形钢桥墩柱在轴力和水平往复荷载作用下的弹塑性力学性能进行了试验和数值分析。在长细比、径厚比参数相同的条件下,制作了2组共8根桥墩柱试件,考察混凝土填充高度对该类桥墩柱最大承载力、延性等抗震性能的影响。同时,为了进一步讨论试件应力分布及变形破坏情况,对8根试验试件采用非线性有限元软件ABAQUS进行了数值分析。结果表明:与空钢管桥墩柱相比,部分填充混凝土圆形钢桥墩柱具有良好的抗震性能;随着混凝土填充率ξ的增加,该类桥墩柱的最大承载力和延性均有显著提高;对于SC34-66系列4个试件,ξ达到0.28后,持续增加混凝土的填充率,虽然能提高试件的承载力,但延性下降;结构破坏时钢管根部出现了应力集中现象,混凝土等效塑性应变分布范围较大,表明钢管与混凝土共同有效地抵御了外荷载作用。更多还原

【Abstract】 In order to investigate failure mechanism and seismic performance of partially concretefilled steel(CFS)circular bridge piers,the elastio-plastic mechanical behavior experiment and numerical analysis of partially CFS circular piers were carried out under constant axial load and cyclic lateral load.At the same slenderness ratio and radius-thickness ratio,8specimens in two series had been examined to study the impact of the filled concrete height on the maximum strength and the ductility.And in order to study the stress distribution and deformation damage of specimens,these 8specimens had been numerically analyzed by nonlinear finite element analysis ABAQUS package.The results show that through comparison with hollow steel tube piers,partially CFS circular piers behave better in seismic performance.As the filled concrete ratioξincreases,the maximum strength and ductility of the pier are improved significantly.However it can be found that whenξreaches 0.28,though the maximum strength of the pier(SC34-66series)is improved asξincreases,the ductility declines.It is found that stress concentration occurs at the root of steel tube and the distribution of equivalent plastic strain of concrete is large while structure fails through FEM analysis,which indicates that the steel tube and concrete together resist the external loads effectively.更多还原