[1]张岗,宋超杰,李建章,等.火灾后钢混凝土组合梁承载能力评价方法[J].长安大学学报(自然科学版),2021,41(2):1-11.
 ZHANG Gang,SONG Chao jie,LI Jian zhang,et al.Evaluation method of loadcarrying capacity of steelconcretecomposite girders after fire exposure[J].Journal of Chang’an University (Natural Science Edition),2021,41(2):1-11.
点击复制

火灾后钢混凝土组合梁承载能力评价方法()
分享到:

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:
1-11
栏目:
桥梁与隧道工程
出版日期:
2021-03-15

文章信息/Info

Title:
Evaluation method of loadcarrying capacity of steelconcretecomposite girders after fire exposure
作者:
张岗宋超杰李建章贺拴海李徐阳汤陈皓
(长安大学 公路学院,陕西 西安 710064)
Author(s):
ZHANG Gang SONG Chaojie LI Jianzhang HE Shuanhai LI Xuyang TANG Chenhao
(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钢混凝土组合连续梁安全评价方法
Keywords:
bridge engineering residual loadcarrying capacity finite element analysis steelconcrete composite continuous girder safety evaluation method
文献标志码:
A
摘要:
针对钢混凝土组合梁遭遇火灾后的安全问题,采用火灾场景反演方法和火灾高温场推定方法,建立了火灾后钢混凝土组合梁的安全评价方法。以三跨钢混凝土组合连续梁为研究对象,首先,根据遭遇火灾后的现状反演桥梁纵向受火位置、受火长度和空间受火位置,构建火灾场景数据库。其次,通过火灾后钢混凝土组合连续梁外观特征推测桥梁遭遇火灾时的受火温度,采用ANSYS有限元软件分析了经历不同火灾场景后钢混凝土组合连续梁的荷载位移曲线,从而得到其极限承载能力的衰退曲线。最后,对钢混凝土组合连续梁剩余承载能力与恒载和活载作用下的作用效应对比,定义了承载能力损伤分级评定标准。研究结果表明:钢混凝土组合连续梁遭遇的火灾温度越高、受火长度越长,承载力损失越大;中跨跨中遭遇火灾后的钢混凝土组合连续梁损伤程度最低,中支点和边跨跨中遭遇火灾后损伤程度较高;中跨跨中遭遇火灾后仅温度达到1 000 ℃时部分工况承载能力为Ⅱ级损伤,中支点和边跨跨中在同样受火温度下已有工况承载能力达到Ⅳ级损伤;桥面发生火灾后钢混凝土组合连续梁损伤程度较低,桥面桥下同时遭遇火灾后损伤程度远高于桥面火灾;桥面遭遇火灾后仅温度达到800 ℃后部分工况承载能力损伤达到Ⅱ级,桥面桥下同时遭遇火灾后在温度达到900 ℃时部分工况承载能力已达到Ⅲ级损伤。建立的火灾后钢混凝土组合梁分类分级安全评价方法简单实用。
Abstract:
Aiming at the safety problems of steelconcrete composite girders after fire exposure, a safety evaluation method of steelconcrete composite girders after fire exposure was established using fire scenario inversion method and fire temperature estimation method.A threespan steelconcrete composite continuous girder was selected as the research object. Firstly, the fire scenario database was established according to the longitudinal fire position, fire length and spatial fire position inversed from the current situation after fire exposure. Secondly, the fire temperature was inferred based on the appearance characteristics of the steelconcrete composite continuous girder after fire exposure. The loaddisplacement curve of the steelconcrete composite continuous girder after different fire scenarios were analysed using ANSYS finite element software, and the decline curve of ultimate loadcarrying capacity was obtained. Finally,the damage classification standard of loadcarrying capacity was defined by comparing the residual loadcarrying capacity of steelconcrete composite continuous girder with the action effect under dead load and live load. The results show that the larger loadcarrying capacity loss of the steelconcrete composite continuous girder with higher fire temperature and longer fire length. The damage degree of the steelconcrete composite continuous girder is slight after fire exposure in midspan of the middle span, while the middle fulcrum and midspan of the side span after fire exposure have higher damage degree. After fire exposure in midspan of the middle span, the loadcarrying capacity of some cases is grade Ⅱ damage only when the fire temperature reaches 1 000 ℃, and the loadcarrying capacity reaches grade Ⅳ damage when the middle fulcrum and midspan of the side span after fire exposure under same fire temperature. The damage degree of the steelconcrete composite continuous girder is slight after fire exposure on the bridge deck, and fire exposure on the bridge deck and under the bridge have much higher damage degree. After fire exposure on the bridge deck, the loadcarrying capacity damage of some cases reaches grade Ⅱ only when the fire temperature reaches 800 ℃. After fire exposure on the bridge deck and under the bridge, the loadcarrying capacity reaches grade Ⅲ damage when the fire temperature reaches 900℃. The classification and grading safety assessment method established for steelconcrete composite continuous girder after fire exposure is simple and practical. 3 tabs, 10 figs, 27 refs.

相似文献/References:

[1]李宇,朱晞,杨庆山,等.高墩大跨桥梁结构的脆弱性分析[J].长安大学学报(自然科学版),2012,32(01):0.
[2]高亮,刘健新,张丹,等.桁架桥主梁三分力系数试验[J].长安大学学报(自然科学版),2012,32(01):0.
[3]刘旭政,王丰平,黄平明,等.斜拉桥各构件校验系数的常值范围[J].长安大学学报(自然科学版),2012,32(01):0.
[4]尚维波,张春宁.高墩刚构桥系梁抗震分析[J].长安大学学报(自然科学版),2012,32(01):0.
[5]邬晓光,李冀弘,宋伟伟.基于改进响应面法的在役PC桥梁承载力可靠性[J].长安大学学报(自然科学版),2012,32(03):53.
 WU Xiao-guang,LI Ji-hong,SONG Wei-wei.Reliability of existing PC bridge based on improved response surface method[J].Journal of Chang’an University (Natural Science Edition),2012,32(2):53.
[6]石雄伟,袁卓亚,马毓泉,等.钢板-混凝土组合加固预应力混凝土箱梁[J].长安大学学报(自然科学版),2012,32(03):58.
 SHI Xiong-wei,YUAN Zhuo-ya,MA Yu-quan,et al.Prestressed concrete box girder strengthened with comsposition of steel plate and concrete[J].Journal of Chang’an University (Natural Science Edition),2012,32(2):58.
[7]李传习,陶 伟,董创文.斜交墩截面刚度与弯曲正应力[J].长安大学学报(自然科学版),2012,32(03):63.
 LI Chuan-xi,TAO Wei,DONG Chuang-wen.Sectional stiffness and bending normal stress of oblique pier[J].Journal of Chang’an University (Natural Science Edition),2012,32(2):63.
[8]邓继华,邵旭东.带铰平面梁元几何非线性有限元分析[J].长安大学学报(自然科学版),2012,32(03):68.
 DENG Ji-hua,SHAO Xu-dong.Geometric nonlinear finite element analysis of plane beam element with hinge[J].Journal of Chang’an University (Natural Science Edition),2012,32(2):68.
[9]蒲广宁,赵 煜,宋一凡.减梁增肋法加固空心板桥的力学性能[J].长安大学学报(自然科学版),2012,32(06):38.
 PU Guang-ning,ZHAO Yu,SONG Yi-fan.Mechanical properties of strengthening hollow slab bridge based on beam-reduction and rib-addition method[J].Journal of Chang’an University (Natural Science Edition),2012,32(2):38.
[10]党 栋,贺拴海,周勇军,等.基于车辆统计数据的汽车荷载标准值取值与评估[J].长安大学学报(自然科学版),2012,32(06):44.
 DANG Dong,HE Shuan-hai,ZHOU Yong-jun,et al.Choosing and assessment for the standard of vehicle load based on vehicle statistical data[J].Journal of Chang’an University (Natural Science Edition),2012,32(2):44.
[11]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.
 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.

更新日期/Last Update: 2021-04-02