灌浆波纹管装配式桥墩双向地震损伤评价方法

Bidirectional seismic damage evaluation method for corrugated duct grouting prefabricated bridge piers

灌浆波纹管连接是装配式墩常用接头连接方式之一,但没有系统研究其受到双向往复荷载作用的整体抗震性能,地震损伤评价方法不够完善。通过双向拟静力试验,研究在双向往复荷载作用状态下灌浆波纹管连接装配式墩的滞回特性变化和破坏模式,讨论了损伤指标构建方法,依据易损性曲线损伤评估了灌浆波纹管装配式墩的抗震性能。结果发现:装配式墩的变形能力和承载能力因双向荷载的耦合效应而急剧下降,装配式墩双向受力损伤状态可以采用Park‐Ang值综合反映。在所给加速度情况下,可通过易损性分析得到各装配式墩构件不同损伤状态的超越概率,在峰值加速度一样时,纵桥向损伤状态发生的最大超越概率要比横桥向高。研究结果可以为灌浆波纹管装配式墩双向地震损伤评价提供方法。

Grouting bellows connection reinforcement is one of the common joint connection methods for assembly piers,However,there is no systematic study of its overall seismic performance subjected to bi⁃directional recipro⁃cating loads,and there is even a lack of effective seismic damage evaluation methods.Study the change of hystere⁃sis characteristics and damage mode of grouted bellows connected assembled pier under the action state of two⁃way reciprocating load by two⁃way proposed static test,the damage index construction method is discussed,seismic per⁃formance of grouted bellows assembled piers was evaluated based on susceptibility curve damage.It is found that the deformation capacity and bearing capacity of the assembled pier decreased sharply due to the coupling effect of the two⁃way load,and the two⁃way force damage state of the assembled pier can be reflected by the Park⁃Ang value synthesis.In the given acceleration case,the probability of exceeding different damage states of each assembled pier member can be obtained by susceptibility analysis,At the same peak acceleration,the maximum probability of overtaking the damage state in the longitudinal direction is higher than that in the cross⁃bridge direction.The re⁃sults of the study can provide a method for evaluating the two⁃way seismic damage of grouted bellows assembled piers.