摘要
为了给工程设计人员提供简单、易懂、实用的薄壁加劲钢桥墩抗震设计理论和评估方法,提出了基于纤维梁单元的简化抗震评估方法。以薄壁加劲箱形悬臂钢桥墩为研究对象,首先通过建立基于壳单元的有限元模型并与试验进行对比,验证了双线性随动强化模型的有效性和壳单元有限元模型的精确性;其次通过12个数值算例,评估了3种不同应力-应变关系对薄壁加劲箱形钢桥墩的纤维梁单元模型Pushover分析所得极值点的影响,并与壳单元有限元模型的结果进行对比,验证了考虑局部屈曲效应的简易应力-应变关系的可行性。结果表明:使用提出的纤维梁单元模型和对局部屈曲进行简化考虑的修正双线性应力-应变关系,可以比较精确地评估薄壁加劲箱形钢桥墩的抗震性能。
Aimed at providing a simplified seismic evaluation method for steel bridge piers with thin-wailed stiffened box sections for designers, a new simplified seismic evaluation approach wasproposed based on the fiber element. Firstly, FE analysis model based on shell element for the thin-walled stiffened box-section bridge pier was established and the bilinear kinematic hardeningmodel and shell element FE model were verified by the experiment. Secondly, twelve eases of thin-walled stiffened steel piers were used to evaluate three kinds of stress strain relations by thePushover analysis using the model based on fiber element, in which the effect of the local buckling was taken into account in the assumed stress-strain relation. The results show that theaccuracy of the model based on fiber element combined with the modified stress-strain relation can satisfy the requirements of the seismic evaluation for steel piers with thin walled stiffened boxsections.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2013年第1期113-120,共8页
China Journal of Highway and Transport
基金
交通运输部西部交通建设科技项目(2011 318 775 680)
交通运输部部省联合攻关科研项目(2009-353-332-300)
关键词
桥梁工程
钢桥墩
有限元分析
抗震评估方法
薄壁
加劲箱形截面
纤维梁单元
bridge engineering
steel bridge pier
finite element analysis
seismic evaluation method
thin-wall
stiffened box section
fiber element
