预制T梁早期水化热温度效应及梁端开裂机理

doi:10.13229/j.cnki.jdxbgxb20200599

摘要/Abstract

摘要：

为避免预制混凝土T梁在施工养护期间产生较高的水化热而导致梁端出现早期竖向裂缝，以一座40 m预应力混凝土T梁为研究对象，对其浇筑过程水化热发展及早龄期力学性能进行监测与测试，并基于实测结果建立考虑梁段早期时变的精细化有限元模型，研究浇筑过程水化热温度场演变特征、梁端应力分布规律。结果表明：40 m跨预制T梁在混凝土浇筑初期，靠近梁端位置因水化过程中的温度迅速聚集而具有较高的开裂风险，且在距梁端2~4 m区域的腹板靠近翼缘板位置易贯通。建议控制入模温度在20 ℃以内并采用优化配合比的方法，减少水泥用量或采用低水化热水泥，以达到降低水化热和防止裂缝产生的目的。

关键词: 预应力混凝土T型梁, 梁端裂缝, 水化热, 温度场, 应力场, 有限元法

Abstract:

In order to avoid high hydration heat of precast concrete T beam during construction and maintenance， early vertical cracks appear at the beam end. Taking a 40-meter prestressed concrete T-beam as the research object， the mechanical properties of the concrete t-beam during the pouring process were monitored and tested. According to the measured results， a refined finite element model considering the early time-varying of the beam segment was established. And based on the above model， the evolution characteristics of hydration heat temperature field and the stress distribution law at the end of the beam during pouring process were studied. The results show that in the initial stage of concrete pouring of the 40-meter-span precast T-beam， the position near the beam end has a higher risk of cracking due to the rapid accumulation of temperature during the hydration process. In the area 2m～4m away from the beam end， the cracks are easy to penetrate through the web near the flange plate. It is recommended to control the mold-in temperature within 20 ℃， and adopt the method of optimizing the mixing ratio， reduce the amount of cement or use low-heat-of-hydration cement to reduce the heat of hydration and prevent cracking.

Key words: prestressed concrete T-beam, crack at the beam end, hydration heat, temperature field, stress field, finite element method

中图分类号:

U441

惠迎新,孙晓荣,王红雨,高晨. 预制T梁早期水化热温度效应及梁端开裂机理[J]. 吉林大学学报(工学版), 2021, 51(5): 1734-1741.

Ying-xin HUI,Xiao-rong SUN,Hong-yu WANG,Chen GAO. Effect of hydration heat temperature and cracking mechanism of beam end in early stage of T⁃beam[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(5): 1734-1741.

图/表 13

图1

图2

图3

表1

表2

预制T梁混凝土的早龄期力学性能"

龄期τ/d	$f (c u, τ) / M P a$	$f (t, τ) / M P a$
1	13.5	1.32
3	29.3	2.20
5	36.6	2.55
7	41.4	2.78
10	46.5	3.00
28	61.3	3.60

表2

图4

表3

表4

图5

图6

图7

图8

表5

参考文献 14

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测点名称	2 m截面峰值/℃	4 m截面峰值/℃
测点1、3	42.9	40.9
测点4、5	43.8	43.0
测点7、9	46.0	44.4
测点11、13	43.5	43.9
测点2	43.5	42.3
测点6	50.8	49.9
测点8	53.8	51.9
测点10	58.9	56.2
测点12	52.8	50.5

模型编号	入模温度/℃	温度峰值/℃	模型编号	水泥含量/（kg·m^-3）	温度峰值/℃
1	基准模型	54.1	1#	基准模型	54.1
2	15	50.4	2#	360	51.9
3	25	56.7	3#	370	53.3
4	30	58.7	4#	390	55.1
－	－	－	5#	400	56.4