高铁特大跨混凝土连续梁徐变设计应用研究
薛照钧
(中铁第四勘察设计院集团有限公司，湖北武汉430063)
摘 要：为解决由于没有实测数据作参考而造成对徐变预测不准确的问题，选取已建的3座
高铁特大跨混凝土连续梁，对其收缩、徐变的设计、计算、实测及远期预测进行研究。通过分析比较
现有的3种徐变计算方法，最终选取采用《铁路桥涵钢筋混凝土和预应力混凝土设计规范》的方法
计算徐变，对比计算与实测结果，分析表明：混凝土徐变变形一年内可完成总量的7O 以上；梁合
龙后，二期恒载加载龄期在6O d时徐变速率对梁挠度的后期影响非常小；为控制徐变，设计梁时应
使截面上、下缘应力在预应力及恒载作用下尽量接近；采用所选规范计算收缩、徐变可满足工程要
求；根据实测变形数据，采用双曲线法预测的连续梁长期徐变与数值计算基本吻合。
关键词：高速铁路；无碴轨道；连续梁；徐变；预测；应用
中图分类号：TU528．01 文献标志码：A
Study of Creep Design and Application of Long Span
Concrete Continuous Beams for High·-Speed Railway
XUE Zhao-jun
(China Railway Tiesiyuan Survey and Design Group Co．，Ltd．，Wuhan 430063，China)
Abstract：To resolve the problem of inaccurate creep prediction due to the voidance of refer—
ence of actually measured data， the long span concrete continuous beams of three completed
bridges on high—speed railway are selected and the shrinkage，creep design，calculation，measure—
ments and long—term prediction of the beams are studied．Through analysis and comparison of the
existing three kinds of the creep calculation methods，the method in the Code for Design on
Reinforced and Prestressed Concrete Structure of Railway Bridge and Culvert is chosen to cal—
culate the creep and the calculation of the creep is compared to the measurements．The results of
the analysis indicate that more than 70 of the total creep deformation of the concrete can be
com pleted within one year． After closure of the beam s，the influence of the creep rate at the tim e
of 60 d age of concrete after imposing the second phase dead load on the late period deflection of
the beams is very little．However，to control the creep，when a beam is designed，the stress in
the upper and lower flanges of the section of the beam under the action of prestressing and dead
load should be kept possibly identica1．The calculation of the shrinkage and creep by the chosen
code can meet the requirem ents for construction and in accordance with the m easured data of the
deformation，the prediction of long—term creep of the concrete continuous beams by the hyperbolic
method is basically agreeable with that by the numerical calculation．
Key words：high—speed railway；ballastless track；continuous beam ；creep；prediction；appli

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