大体积混凝土桥墩裂缝分析整治及建议  

The Reason Analysis of the Mass Concrete Pier's Crack and Maintain Measures and Suggestions

作　　者：孙衍福[1] 郭治胜 吴大宏[1] 

机构地区：[1]铁道第三勘察设计院,天津300142

出　　处：《铁道工程学报》2006年第5期67-69,112,共4页Journal of Railway Engineering Society

摘　　要：研究目的:对大体积桥墩混凝土表面裂缝产生的原因进行分析,据此研究制定相应的整治措施,并针对铁路客运专线桥梁墩台裂缝控制提出建议。研究方法:根据桥墩裂缝发生的部位,建立桥墩有限元分析模型,对桥墩在恒载、活载、墩身内外温差、混凝土收缩和降温等最不利荷载组合情况下进行墩身结构的空间应力分析,根据分析结果来确定裂缝产生的原因。研究结果:混凝土收缩和降温或水化热产生的墩身混凝土表面最大拉应力远远大于恒载加活载的劈裂应力,超出混凝土的抗拉强度。混凝土收缩和降温或大体积混凝土的水化热应力是桥墩开裂的主要因素。研究结论:铁路客运专线大体积混凝土桥墩在设计与施工时应采取降低内外温差等有效措施以防止产生裂缝。Research purposes：The paper analyzes the mass pier＇s concrete surface crack reason. Hereby , the paper studies and makes appropriate maintain measures, and makes some suggestions for the current passenger transport special railway line bridge construction. Research methods： According to the part of crack in the pier, the paper erects finite element analysis model of the pier, analyzes the space stress of the pier structure under dead load, live load, inner and outer temperature difference, concrete shrinkage and drops in temperature, et. According to the analysis result, the worst - case load combination situation makes sure the reason of the crack. mass concrete. Research conclusions：The mass concrete pier construction of passenger transport special railway line can adopt these measures in design and construction.

关 键 词：裂缝 大体积混凝土 原因分析 建议 

分 类 号：U442[建筑科学—桥梁与隧道工程]