摘要
对于隧道结构的设计,工程设计人员往往通过有限元数值分析结果再结合以往工程设计经验对结构进行验算。为确保有限元计算结果较真实地反应结构受力情况,基于荷载-结构模型,从基础理论出发,对隧道结构进行拆解分析,为有限元建模提供理论基础,并引入弹性地基梁计算理论对有限元方法进行补充,在此基础上提出两种基于Midas Civil的有限元建模方法,并以广州某过江隧道工程为背景对两种方法进分析计算。通过理论和有限元计算结果表明,有限元模型和理论模型无法准确计算特定工况下真实的结构响应,此时可将底板按弹性地基梁进行受力分析,对于隧道底板底边缘受压的情况,提出的两种有限元模拟方法均能满足设计要求,基于保守原则,对于隧道底板底边缘受拉的情况,在结构验算时,有必要考虑采用弹性地基梁计算得到的结构响应。
For the design of tunnel structures,engineering designers often check the structure through the results of finite element numerical analysis combined with previous engineering experience.In order to ensure that the finite element calculation results truly reflect the stress of the structure,based on the load-structure model,this paper starts from the basic theory,dismantles and analyzes the tunnel structure,provides a theoretical basis for the finite element modeling,and introduces the elastic foundation beam calculation.The theory supplements the finite element method.On this basis,two finite element modeling methods based on Midas Civil are proposed,and the two methods are analyzed and calculated in the background of a river crossing tunnel project in Guangzhou.The theoretical and finite element calculation results show that the finite element model and the theoretical model cannot accurately calculate the real structural response under specific conditions.At this time,the bottom plate can be subjected to force analysis as an elastic foundation beam.The two proposed finite element simulation methods can meet the design requirements.Based on the conservative principle,for the tension of the bottom edge of the tunnel floor,it is necessary to consider the structural response calculated by the elastic foundation beam in the structural verification.
作者
彭聪
PENG Cong(Guangzhou Municipal Engineering Design Research Institute Co.,Ltd.Guangzhou 510060,China)
出处
《广东土木与建筑》
2022年第8期42-46,共5页
Guangdong Architecture Civil Engineering
