|本期目录/Table of Contents|

[1]郭增伟,陈 旦,周建庭,等.相变混凝土箱梁温度-应力场耦合分析[J].建筑科学与工程学报,2019,36(01):67-75.
　GUO Zeng-wei,CHEN Dan,ZHOU Jian-ting,et al.Coupling Analysis of Temperature and Stress Field of Phase Change Concrete Box Girder[J].Journal of Architecture and Civil Engineering,2019,36(01):67-75.
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相变混凝土箱梁温度-应力场耦合分析(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
36卷
期数:
2019年01期
页码:
67-75
栏目:
出版日期:
2019-01-23

文章信息/Info

Title:
Coupling Analysis of Temperature and Stress Field of Phase Change Concrete Box Girder
作者:
郭增伟，陈 旦，周建庭，王 宇
重庆交通大学土木工程学院
Author(s):
GUO Zeng-wei, CHEN Dan, ZHOU Jian-ting, WANG Yu
School of Civil Engineering, Chongqing Jiaotong University
关键词:
桥梁工程; 相变混凝土; 单箱多室箱梁; 梯度温差; 温度应力
Keywords:
bridge engineering;  phase change concrete;  multi cell concrete-box girder;  temperature gradient;  thermal stress
分类号:
-
DOI:
-
文献标志码:
A
摘要:
为控制混凝土箱梁日照温度梯度所产生的主拉应力，采用稻壳灰封装石蜡作为相变材料制备具有“结构+功能”一体化功效的相变混凝土，通过试验探究了稻壳灰石蜡相变混凝土的热稳定性及其热工、力学参数，并以实际工程为背景讨论了相变混凝土铺设厚度和位置对单箱多室箱梁的梯度温度效应影响。结果表明：稻壳灰石蜡相变混凝土具有良好的相变稳定性，多次相变循环后石蜡不会出现大量渗漏现象，但相变混凝土强度会有所下降；将铺装层下一定厚度普通混凝土替换为相变混凝土后，箱梁顶板内温度有明显降低，且梯度温度拉应力有10%的下降；铺装层厚度相等条件下，箱梁顶板最大温度应力随着相变混凝土厚度的增加先减小后增加，边腹板和中腹板内温度应力则随着相变材料厚度的增加呈现单调递减的趋势；随着沥青铺装层厚度的增加，相变混凝土层对温度应力的改善效果逐渐下降；腹板和承托对应的顶板区域是影响箱梁梯度温度应力场的敏感部位，而悬臂板和内箱上部所对应的顶板区域内相变混凝土则基本不影响箱梁最大温度应力；箱梁内室数量虽然不能改变边腹板内温度竖向分布规律，但箱梁最大温度应力会随箱梁内室的增多而增大，在箱梁顶板活载强度能满足要求的前提下应尽量减少中腹板的数量，以减小温度自应力。
Abstract:
In order to control the principal tensile stress of concrete box girder induced by temperature gradient of sunshine, phase change concrete with “structure and function” integration effect by mixing rice husk ash encapsulated paraffin as phase change material. Thermal stability of the rice husk ashparaffin phase change concrete as well as its thermal and mechanical parameters were tested by experiment, and the influence of thickness and laying position of phase change concrete on principal tensile stress of concrete box girder induced by temperature gradient of sunshine were discussed based on practical project. The results show that the rice husk ashparaffin phase change concrete has good phase change stability, and there is no serious leakage of paraffin after multiple phase change cycles, while the concrete strength decreases. The temperature on the top of box girder decreases obviously and the tensile stress of the gradient temperature decreases by 10% when the ordinary concrete with a certain thickness under the pavement is replaced by the phase change concrete. When the thickness of the pavement is equal, the maximum thermal stress on the top of box girder firstly decreases and then increases with the increase of the thickness of phase change concrete, while the thermal stresses in side web and middle web decrease monotonously with the increase of the thickness of phase change material. However, with the increase of the thickness of asphalt pavement, the improvement effect of phase change concrete layer on temperature stress decreases gradually. The roof area corresponding to the web and chamfer are sensitive parts which affect the gradient temperature stress field of box girder, while the roof area corresponding to the cantilever plate and upper part of the inner box does not affect the maximum temperature of the box girder basically. Although the number of chambers in the box girder cant change the vertical distribution of temperature in the side web, the maximum temperature stress of the box girder will increase with the increase of the chamber. The number of web slabs maybe as little as possible if the liveload bearing capacity of roof slab can meet the requirement, so the temperature selfstress can be reduced.

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备注/Memo

备注/Memo:
更新日期/Last Update: 2019-01-23