基于FEA全桥模型的预制小箱梁隐盖梁受力分析研究  

Analysis and Study on Stress of Hidden Bent Cap of Precast Small-box Beam Based on FEA Full-bridge Model

作　　者：罗干生 史贤豪 肖海波 LUO Gansheng;SHI Xianhao;XIAO Haibo

机构地区：[1]宁波市城市基础设施建设发展中心,浙江宁波315042 [2]宁波市城建设计研究院有限公司,浙江宁波315012

出　　处：《城市道桥与防洪》2022年第8期170-172,M0018,M0019,共5页Urban Roads Bridges & Flood Control

摘　　要：结合工程实际,提出采用数值分析的方法研究了隐盖梁受力特点,在同类工程中具有借鉴意义.通过Midas Civil梁单元模型和Midas FEA全桥实体单元模型进行对比分析,可得到以下结论:采用FEA整体建模能有效模拟隐盖梁受力情况;小箱梁与隐盖梁交界处存在应力集中,导致主拉应力较大,设计时应保证小箱梁纵向钢筋的完整并减少隐盖梁预应力开槽对结构的削弱;由于边墩隐盖梁嵌固效应,导致边跨跨中正弯矩减小,设计中可适当减小边跨小箱梁预应力筋.Combined with the engineering practice,the numerical analysis method is proposed to study the loading features of hidden bent cap,which has the reference significance in the similar projects.Through the comparative analysis of the Midas Civil beam element model and the Midas FEA full bridge solid element model,the following conclusions can be obtained that the use of FEA overall modeling can effectively simulate the stress situation of the hidden bent cap.There is a stress concentration at the junction of the small-box beam and the hidden bent cap,which results in the main tensile stress larger.The design should ensure the integrity of the longitudinal reinforcement of the small-box beam and reduce the weakening of the prestressing slotting of the hidden bent cap to the structure.The embedded effect of the hidden bent cap of side pier leads to the reduction of the positive bending moment in the middle of the side span.The prestressed tendons of the side span small-box beam can be appropriately reduced in the design.

关 键 词：隐盖梁 FEA计算 应力集中 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]