长悬臂混凝土箱梁板单元模型计算分析  

Calculation and analysis of plate element model of long cantilever concrete box girder

作　　者：刘璐 韩扬 王建波 史文浩 LIU Lu;HAN Yang;WANG Jian-bo;SHI Wen-hao(School of Management Engineering,Qingdao University of Technology,Shandong Qingdao 266520,China;Zhengzhou Design Institute,China Railway Engineering Design and Consulting Group Co.,Ltd.,Zhengzhou 450001,China;Department of Urban Construction,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]青岛理工大学管理工程学院,山东青岛266520 [2]中铁工程设计咨询集团有限公司郑州设计院,郑州450001 [3]北京工业大学城市建设学部,北京100124

出　　处：《齐齐哈尔大学学报（自然科学版）》2022年第3期48-56,共9页Journal of Qiqihar University(Natural Science Edition)

基　　金：国家自然科学基金项目“参与方个体视角下大型工程项目融资风险动态评价体系研究”(71471094);山东省自然科学基金项目“基于生态学的大型工程项目融资风险管理体系研究”(ZR2011GL021);青岛市社科规划项目“青岛城市基础设施投融资体制创新研究”(QDSKL100403)。

摘　　要：为保证长悬臂混凝土箱梁的结构安全性,工程设计当中应建立简便有效的有限元模型予以验算。以某新建人行景观桥为工程背景,采用MIDAS/Civil、ANSYS等有限元模拟软件建立了多种模型,以期选取更加合理、准确的适合实际工程设计的长悬臂箱梁计算模型。通过提取各模型中的支反力及典型横截面应力进行对比分析可知,与单梁、梁格模型和实体单元模型相比,板单元支反力大小最接近实体模型的支反力,横向应力变化趋势与实体模型基本保持一致,更能直观反映长悬臂混凝土箱梁的空间效应。此外,为了保证长悬臂混凝土箱梁的结构安全性,研究了板单元模型在不同部位、不同状态下的应力分布差异,以及施加不同程度的横向预应力对长悬臂截面的受力影响。研究表明,箱梁长悬臂处的剪力滞效应十分明显。合理施加横向预应力束可以有效改善顶板应力状况,降低箱梁的剪力滞效应,保证梁体的受力安全。In order to ensure the structural safety of long cantilever concrete box girder,a simple and effective finite element model should be established in engineering design.In this paper,taking a newly built pedestrian landscape bridge as the engineering background,MIDAS/Civil ANSYS and other finite element simulation software was used to establish single beam,grillage,solid and plate element of the long cantilever box girder,in order to select a more reasonable and accurate long cantilever box girder calculation model suitable for practical engineering design.By extracting the model of the reaction and the typical cross section stress comparison analysis showed that,compared with single beam,grillage,entity unit model method,plate unit for counterforce size closest to the entity model of the reaction force and horizontal stress change trend was almost consistent with the entity model,more can intuitively reflect the space effect of long cantilever concrete box girder.In addition,in order to ensure the structural safety of the long cantilever concrete box girder,the stress distribution difference of the plate element model in different parts and different states,and the effect of different degrees of transverse prestress on the long cantilever section were studied.The results showed that the shear lag effect at the long cantilever of box girder was very obvious.When the application of transverse prestress was effectively improved the stress of the roof and ensured the safety of the beam.

关 键 词：长悬臂 箱梁 板单元模型 受力分析 

分 类 号：U441[建筑科学—桥梁与隧道工程]