摘要
针对桥梁地震易损性分析中计算量偏大的研究现状,首先,以一座多跨连续梁桥为研究对象,综合考虑材料、结构和地震动的不确定性,提出了一种基于均匀设计和响应面法的地震易损性分析方法。基于Open Sees建立了算例桥梁非线性有限元模型。然后,考虑桥墩和支座等桥梁构件的损伤,定义桥墩和支座在不同损伤状态下的损伤指标,建立了桥梁构件和桥梁系统地震易损性曲线。最后,为验证本研究方法在桥梁地震易损性分析中的适用性和有效性,分别通过本研究方法、蒙特卡罗、正交设计和中心复合设计的响应面法对算例桥梁进行地震易损性分析,分别从抽样次数、计算耗时、响应面模型精度和易损性曲线等方面,对4种方法进行了比较。研究结果表明:在易损性曲线方面,本研究方法与基于蒙特卡罗的响应面法的偏差约为3%;在抽样次数、有限元计算耗时方面,本研究方法分别比基于蒙特卡罗、中心复合设计和正交设计的响应面法减少了99.70%,58.49%,8.70%;本研究方法建立的结构响应面模型与基于中心复合设计和正交设计的响应面法相比,其精度分别提高了12%和5%。
In view of the research situation of large calculation in bridge seismic fragility analysis, taking a multi-span continuous girder bridge as the research object, an alternative seismic fragility analysis method is proposed based the uniform design response surface methodology at first. This proposed method can take the uncertainties derived from material, structure and ground motion into account. The nonlinear finite element model of the case studied bridge is built based on OpenSees program. Then, considering the damage of bridge components such as piers and beatings, the damage indexes of piers and beatings in different limit states are defined, and the corresponding seismic fragility curves of bridge components and bridge system are established. Finally, to verify the suitability and effectiveness of the proposed method in bridge seismic fragility analysis, the proposed method, Monte Carlo （MC） , orthogonal design and central composite design （CCD） response surface method are used to carry out the seismic fragility analysis. The abovementioned methods are compared in terms of sampling frequency, time-consuming, response surface model accuracy and seismic fragility curves. The result indicates that （ 1 ） compared with Monte Carlo response surface method, the deviation of component fragility curve of the proposed method is about 3 % ; （2） compared with Monte Carlo, central composite design and orthogonal design response surface method, the proposed method reduced by 99.70%, 58.49% and 8.70% in sampling frequency, time-consuming of finite element calculation respectively; （3） compared with central composite design and orthogonal design response surface method, the accuracy of the structural response surface model established by the proposed method is increased by 12% and 5% respectively.
出处
《公路交通科技》
CAS
CSCD
北大核心
2017年第11期100-109,共10页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51278183)
关键词
桥梁工程
地震易损性
均匀设计
响应面法
连续梁桥
Open
SEES
bridge engineering
seismic fragility
uniform design （UD）
response surface method （RSM）
continuous girder bridge
OpenSees
