容许应力法与极限状态法偏压构件裂缝宽度计算的对比分析  

Comparative Analysis of Crack Width Calculation in Eccentric Compression Member by Allowable Stress Method and Limit State Method

作　　者：刘卫华 Liu Weihua(China Railway Fifth Survey ond Design Institute Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《市政技术》2022年第3期205-208,共4页Journal of Municipal Technology

摘　　要：以矩形轻型桥墩为例,首先推导出铁路规范中未明确的钢筋应力计算表达式,然后再按照TB 10092—2017《铁路桥涵混凝土结构设计规范》与JTG 3362—2018《公路钢筋混凝土及预应力混凝土桥涵设计规范》对6 m和12 m墩高在不同荷载组合工况下进行裂缝宽度计算分析,从而得出不同规范中裂缝宽度参数计算的差异。分析结果表明:铁路和公路2种规范中,偏心增大系数发展趋势相反、钢筋应力和裂缝宽度极限状态法比容许应力法计算值大。Taking the rectangular light pier as an example,this paper first deduces the calculation expression of reinforcement stress which is not clear in the railway code.Then,according to Code for Design of Concrete Structures of Railway Bridge and Culvert and Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts,the cracks widths of 6 m and 12 m pier heights under different load combinations are calculated and analyzed to obtain the calculation differences of the crack width parameters in different codes.The analysis result shows the development trend of eccentricity increasing coefficients in railway and highway codes are opposite,the calculated value of reinforcement stress and crack width by limit state method is greater than that by allowable stress method.

关 键 词：偏压构件 裂缝宽度 轻型桥墩 参数计算 

分 类 号：TU375[建筑科学—结构工程]