铁路新型钢支墩极限承载力及力学性能研究  

Research on ultimate bearing capacity and mechanical properties of new steel piers for railway

作　　者：黄铭权 王炎[1] 沈波 贾一全 王智航 HUANG Mingquan;WANG Yan;SHEN Bo;JIA Yiquan;WANG Zhihang(School of Civil Engineering and Architecture,Zhejiang Sei-Tech University,Hangzhou 310018,China;Zhejiang Tietou Construction Engineering Co.,Ltd.,Wenzhou 325000,China;Hangzhou Railway Design Institute Co.,Ltd.,Hangzhou 310009,China)

机构地区：[1]浙江理工大学建筑工程学院,杭州310018 [2]浙江省铁投建设工程有限公司,浙江温州325000 [3]杭州铁路设计院有限责任公司,杭州310009

出　　处：《黑龙江工程学院学报》2024年第6期16-23,共8页Journal of Heilongjiang Institute of Technology

基　　金：浙江省交通运输厅科研计划项目(2019022);浙江省交通投资集团有限公司科技计划项目(202304)。

摘　　要：针对便梁传统混凝土支墩自重大、施工慢、不可复用等问题,提出一种新型钢支墩形式。为了研究钢支墩结构安全性和力学性能,采用有限元模型分析新型钢支墩的极限承载力、工作机理及整体应力分布特性。研究表明:钢支墩具有较好的承载能力,保证了便梁防护体系的可靠性;在弹性阶段内,钢支墩荷载与位移呈线性关系,但在非线性阶段,钢支墩荷载-位移曲线斜率减小;随着荷载增大,底板和腹板孔壁先后受螺栓挤压变形,并出现螺栓滑移,导致孔壁被螺栓冲切破坏,在设计和施工中应重点关注底板及腹板;钢支墩整体应力随着母板厚度减少而增大,而加劲肋厚度对钢支墩应力影响较小。基于屈服荷载下的有限元分析提出了母板和加劲肋厚度的建议值,以实现钢材性能的合理利用。To address issues with self-importance,slow construction,and non-reusability of traditional concrete piers for temporary beams,a new type of steel pier has been proposed.The structural safety and mechanical properties of the steel piers were studied using a finite element model to analyze their ultimate bearing capacity,force characteristics,working mechanism,and overall stress distribution.The results show that the steel pier exhibits a high bearing capacity,ensuring the reliability of the temporary beam protection system.In the elastic phase,the steel pier load and displacement are linearly related.However,in the nonlinear phase,the slope of the steel pier load-displacement curve decreases.As the load increases,the bottom plate and web plate hole wall are deformed by bolt extrusion and slip,resulting in hole wall damage from bolt punching and cutting.Therefore,it is crucial to focus on the design and construction of the bottom plate and web plate.The overall stress of the steel pier increases with the reduction of the mother plate thickness.However,the thickness of the stiffening rib has less effect on the stress of the steel pier.Based on the finite element analysis under yield load,the suggested values of the mother plate and stiffening rib thicknesses are given to achieve the reasonable utilisation of the steel properties.This study provides useful insights for the engineering application of steel piers.

关 键 词：既有铁路营业线 便梁支墩 极限承载力 力学性能 有限元法 

分 类 号：U443.2[建筑科学—桥梁与隧道工程]