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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。
In order to provide engineering designers with a simple, easy-to-understand and practical seismic design theory and assessment method for thin-walled stiffened steel piers, a simplified seismic evaluation method based on fiber beam elements is proposed. Taking the thin-walled stiffened cantilever steel pier as the research object, the validity of the bilinear kinematic hardening model and the accuracy of the shell element finite element model are verified by establishing the finite element model based on the shell element and comparing with the experiment Secondly, the influence of three different stress-strain relations on the extreme points of Pushover analysis of fiber-reinforced beam piers for thin-walled stiffened steel piers was evaluated by 12 numerical examples. The results were compared with those of the finite element model of shell element In contrast, the feasibility of simple stress-strain relationship considering local buckling effect is verified. The results show that using the proposed fiber beam element model and the modified bilinear stress-strain relationship for simplified consideration of local buckling, the seismic behavior of thin-walled stiffened steel piers can be evaluated more accurately.