[1]宋超杰,张岗,王富强,等.火灾后柱式桥墩剩余承载性能安全评价[J].长安大学学报(自然科学版),2021,41(2):55-65.
　SONG Chao jie,ZHANG Gang,WANG Fu qiang,et al.Safety evaluation of residual loadcapacity ofcolumn piers after fire exposure[J].Journal of Chang’an University (Natural Science Edition),2021,41(2):55-65.
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火灾后柱式桥墩剩余承载性能安全评价()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年2期
页码:
55-65
栏目:
桥梁与隧道工程
出版日期:
2021-03-15

文章信息/Info

Title:
Safety evaluation of residual loadcapacity ofcolumn piers after fire exposure
作者:
宋超杰; 张岗; 王富强; 万豪; 张永飞
(长安大学 公路学院，陕西 西安 710064)
Author(s):
SONG Chaojie;  ZHANG Gang;  WANG Fuqiang;  WAN Hao;  ZHANG Yongfei
(School of Highway, Changan University, Xian 710064, Shaanxi, China)
关键词:
桥梁工程; 剩余承载能力; 有限元分析; 柱式桥墩; 火灾场景数据库; 安全评价
Keywords:
bridge engineering;  residual loadcarrying capacity;  finite element analysis;  column pier;  fire scenario database;  safety evaluation
文献标志码:
A
摘要:
为评估柱式桥墩遭遇火灾后的安全性能，给火灾后的维修加固提供理论依据，分析了火灾后柱式桥墩的剩余承载能力，并建立其剩余承载性能安全评价指标。以高4 m、直径1.2 m的柱式桥墩为研究对象，建立其经历最高温度、受火位置和受火高度相互耦合的火灾场景数据库。根据桥梁遭遇火灾后柱式桥墩的实际爆裂特征，提出混凝土的高温爆裂“三级指标”。采用ANSYS有限元软件分析经历不同火灾场景后考虑混凝土爆裂的轴心受压柱式桥墩的荷载轴向位移曲线，以及偏心受压柱式桥墩的荷载横向位移曲线，从而得到极限承载能力的衰退曲线。在此基础上，建立了火灾后柱式桥墩的“四级损伤”指标。研究结果表明：柱式桥墩经历最高温度越高，剩余承载能力越小；双侧受火柱式桥墩的剩余承载能力显著小于单侧受火柱式桥墩。全墩高受火偏心受压柱式桥墩剩余承载能力远小于1/2墩高受火。在经历相同火灾场景后，偏心受压柱式桥墩的极限承载能力比轴心受压柱式桥墩衰退更快，偏心受压柱式桥墩较轴心受压柱式桥墩损伤等级更高，双侧全墩高受火偏心受压柱式桥墩最高温度为600 ℃时达到Ⅳ级损伤，而经历相同火灾场景后的轴心受压柱式桥墩仅为Ⅱ级损伤。
Abstract:
To evaluate the safety performance and provide a theoretical basis for the maintenance and reinforcement of column piers after fire exposure, the residual loadcarrying capacity of column piers were analyzed, and its safety evaluation index was established after fire exposure. A column pier with height of 4 m and diameter of 1.2 m was selected as object. A fire scenario database was established, in which the maximum temperature, fire exposure position and fire exposure height of the pier were coupled. According to actual spalling characteristics of column piers after fire exposure, the three grade index of concrete spalling at high temperature was proposed. The loadaxial displacement curves of axially compressed column piers and the loadtransverse displacement curves of eccentrically compressed column piers under different fire scenarios were analyzed using finite element software ANSYS. Therefore, degradation of ultimate loadcarrying capacity of column piers was obtained, and the four grade damage index of column piers after fire exposure was established. The results show that the residual loadcarrying capacity of column piers decreases with increase of the maximum temperature. The residual loadcarrying capacity of column piers with half sides exposed to fire is significantly lower than that of column piers with all sides exposed to fire. The residual loadcarrying capacity of column piers with half height exposed to fire is significantly lower than that of column piers with full height exposed to fire. The ultimate loadcarrying capacity of eccentrically compressed column piers declines faster than that of axially compressed column piers after experiencing same fire scenario, and the damage grade of eccentrically compressed column piers is higher than that of axially compressed column piers. The eccentrically compressed column piers with all sides and full height exposed to fire reaches grade Ⅳ damage when the maximum temperature reaches 600 ℃, while the axially compressed column piers after exposed to same fire scenario is grade Ⅱ damage. 2 tabs, 8 figs, 27 refs.

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更新日期/Last Update: 2021-04-02