基于不同模型的π型主梁斜拉桥力学性能对比分析  

Comparative Analysis of Mechanical Properties of π -Type Girder of Cable-Stayed Bridges Based on Different Models

作　　者：孟令强 MENG Lingqiang(Tiezheng Testing Technology Co.Ltd.,Ji’nan Shandong 250014,China;China Railway 14th Bureau Group Co.Ltd.,Ji’nan Shandong 250014,China)

机构地区：[1]铁正检测科技有限公司,山东济南250014 [2]中铁十四局集团有限公司,山东济南250014

出　　处：《铁道建筑技术》2022年第12期16-19,158,共5页Railway Construction Technology

基　　金：山东省技术创新项目(201820701006)。

摘　　要：针对斜拉桥π形主梁力学性能研究仍需依托整桥有限元模型进行具体分析现状,以威海市环海公路长会口大桥主桥为背景,分别建立脊梁模型、梁格模型、板梁模型进行数值计算并与实桥测试结果进行对比分析,以明确不同建模离散方法对结构力学性能准确性的影响。研究从挠度、应力、剪力滞效应、频率、振型等5个方面展开。结果表明:脊梁模型计算结果精度较低,不推荐采用;梁格模型计算结果具有一定精度,推荐采用该模型做一般性静动力性能分析;板梁模型计算结果精度较高,推荐采用该模型做高层次静动力性能分析。本文结论及分析思路可为类似桥梁结构提供借鉴。At present, the research on the mechanical properties of π-type girder of cable-stayed bridge still depends on the finite element model of the whole bridge. Taking the main bridge of Changhuikou Bridge of Huanhai Highway in Weihai as the background, the spine model, beam lattice model, plate beam model are established respectively for numerical calculation and comparative analysis with the test results of the real bridge, so as to clarify the impact of different modeling discretization methods on the accuracy of structural mechanical properties. The research is carried out from five aspects: deflection, stress, shear lag effect, frequency and vibration mode. The results show that the accuracy of the calculation results of the spine model is low, so the model is not recommended;the calculation results of beam lattice model have certain accuracy, so it is recommended to use this model for general static and dynamic performance analysis;the accuracy of the calculation results of the plate beam model is high, and it is recommended to use this model for high-level static and dynamic performance analysis. The conclusions and analysis ideas of this paper can provide reference for similar bridge structures.

关 键 词：Π型梁 斜拉桥 有限元模型 剪力滞效应 力学性能 静动力性能 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]