折线先张法Bulb-T梁抗弯性能有限元分析  

Finite Element Analysis on Flexural Performance of Bulb-T Beam by Fold Line Pretension Method

作　　者：刘本立 张朋 郭冬梅 Liu Benli;Zhang Peng;Guo Dongmei(Shandong Road&Bridge Construction Group Co.,Ltd.,Jinan 250014,China;School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东省公路桥梁建设集团有限公司,济南2500142 [2]山东建筑大学交通工程学院,济南250101

出　　处：《特种结构》2023年第5期20-24,52,共6页Special Structures

基　　金：山东省企业技术创新项目(202160101415)。

摘　　要：为克服传统直线先张法预应力钢筋混凝土梁跨越能力差的问题,建立折线先张法Bulb-T梁非线性有限元模型,研究主梁材料、桥面板厚度、桥面板材料及受拉压区纵筋直径对抗弯性能的影响。结果表明:基于ABAQUS可精确地模拟折线先张法Bulb-T梁在四点弯曲试验下的破坏形式及受力性能;Bulb-T梁抗弯性能对主梁材料变化较敏感,采用UHPC作为主梁材料可大大提升主梁抗弯承载力和损伤容限;提升桥面板材料性能对改善Bulb-T梁抗弯性能影响较小;Bulb-T梁由于上翼缘厚度不足易出现受压破坏,导致主梁受弯不充分,增设桥面板、提高桥面板厚度、适当增大受拉压区纵筋直径可明显改善整体抗弯性能。In order to improve the maximum span of traditional linear pretensioned prestressed concrete girders,a nonlinear finite element model of Bulb-T girders with fold line pretension method was established to study the effects of main girder material,deck slab thickness,deck slab material and the diameter of longitudinal reinforcement in the tensile and compression zone on the flexural performance.The results showed that finite element model using ABAQUS could accurately simulate the failure mode and bearing performance of Bulb-T girder under four-point bending test.The flexural performance of Bulb-T girder is more sensitive to the change of main girder material,and the UHPC as the main girder material can greatly improve the flexural capacity and damage tolerance of the main girder.On the other hand,the improvement of the performance of deck slab has less effect on the improvement of the flexural performance of Bulb-T girder.Bulb-T girder is susceptible to compression damage due to insufficient thickness of upper flange,resulting in insufficient bending of main girder.Adding deck plate,increasing the thickness of deck plate and the diameter of longitudinal reinforcement in tensile and compression zone,can significantly improve the overall flexural performance.

关 键 词：折线先张法 Bulb-T梁 四点弯曲试验 抗弯性能 数值模拟 

分 类 号：U441[建筑科学—桥梁与隧道工程]