桩腿变化对装配式高架栈桥静力特性的影响  

Influences of length change of pile legs on static mechanical characteristics of prefabricated trestle bridge

作　　者：刘为平[1] 陈徐均[1] 沈海鹏[1] 谢兴坤[1] 

机构地区：[1]解放军理工大学野战工程学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2017年第2期190-196,共7页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家科技支撑计划资助项目(2014BAB16B05);工信部高技术船舶科研项目(工信部[2016]22号文);国家自然科学基金资助项目(51379213)

摘　　要：为了分析桩腿长度对装配式高架栈桥桩腿屈曲和静力特性的影响,在静载作用下计算了不同桩腿长度的装配式高架栈桥的上部结构挠度值和下部桩腿应力值,并分析了桩腿长度变化对栈桥桩腿轴力、平台挠度和桩腿屈曲的影响。计算结果表明,桩腿长8m及以下的装配式高架栈桥,在设计荷载静载作用下,上部结构挠度值和下部桩腿应力值的计算结果在工程允许范围内。桩腿长度变化对上部结构的挠度值和桩腿的轴力影响较小,而对装配式高架栈桥的桩腿的屈曲破坏临界荷载影响较大,尤其是当桩腿长大于5m后,桩腿的屈曲破坏临界荷载急剧下降。装配式高架栈桥在设计200kN轮式荷载和300kN履带荷载作用下会发生桩腿屈曲破坏的桩腿临界长度分别为6.95m和7.63m。In order to analyze the influences of the length of pile legs on the static mechanical characteristics and pile leg buckling of prefabricated trestle bridge,the deflection values of the superstructure and stress values of legs for different lengths of fabricated trestle were calculated,and the influences of leg length change on the axial force of pile legs,deflection of the superstructure and the buckling of pile legs analyzed.Calculation results showed that the superstructure deflection value and stress value of the substructure＇s pile leg are in the range of allowable engineering values under the action of static load when the pile legs are shorter than 8m.It is proved that leg length change has little impact on superstructure deflection and the axial force of pile legs,while it has a greater influence on the critical load of pile leg bucking failure.When the length of pile legs grows up to 5m,the figure of critical buckling falls sharply.The critical length of leg＇s buckling failure of the prefabricated trestle under the load of 200 kN wheel load and300 kN track load is 6.95 and 7.63 m.

关 键 词：高架栈桥 桩腿 挠度 屈曲破坏 临界荷载 

分 类 号：U448.18[建筑科学—桥梁与隧道工程]