摘要
针对混凝土桥梁结构在短期荷载作用下的黏弹性力学行为,提出基于黏弹性本构的桥梁变形分步式数值计算方法。基于数值仿真计算研究本构模型以及黏性与弹性材料体积比等因素的影响,对比同等荷载静力试验与移动荷载试验的桥梁结构黏弹性荷载效应。结合实际桥梁开展试验,实测混凝土桥梁结构短期徐变规律及变形恢复特点。研究结果表明:混凝土桥梁短期徐变效应不明显,在现有静力试验规范规定时间内,徐变量仅占弹性变形的4%;加载、卸载完成初期有明显的徐变和恢复变形,随着时间推移,其变化趋于平缓;静力荷载效应与准静态移动荷载作用效应十分接近;在评价桥梁荷载效应时,静力加载与移动荷载加载方式具有等效性,两者引起的荷载响应相差0.53%~3.19%。
The viscoelastic behavior of concrete bridge structure under short-term load was studied,and a step-bystep numerical calculation method of bridge deformation based on viscoelastic constitutive law was put forword.Based on numerical simulation,the effects of viscoelastic constitutive model and viscoelastic material ratio were studied,and the viscoelastic load effects of bridge structure in the same load static test and moving load test were compared.Combined with the actual bridge,the short-term creep law and deformation recovery characteristics of concrete bridge structure were measured.The results show that the short-term creep effect of concrete bridge is not obvious,and the creep deformation accounts for only 4%of the elastic deformation within the time specified in the existing static test code.At the beginning of loading and unloading,there is obvious creep and recovery deformation,and its change trend tends to be gentle with time.The static load effect is very close to the quasistatic moving load effect.The static load and moving load are equivalent when the bridge load effect is evaluated,and the difference between them is 0.53%−3.19%.
作者
周德
王灿
雒明波
王宁波
周天睿
黄方林
ZHOU De;WANG Can;LUO Mingbo;WANG Ningbo;ZHOU Tianrui;HUANG Fanglin(School of Civil Engineering,Central South University,Changsha 410075,China;China Railway Fourth Survey and Design Institute Group Co.Ltd.,Wuhan 430063,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第6期2155-2166,共12页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52078486)
湖南省自然科学基金资助项目(2021JJ30840,2021JJ50145)
湖南省教育厅科学研究项目青年项目(19B106)。
关键词
混凝土梁桥
静力试验
移动荷载试验
短期黏弹性
力学行为
concrete beam bridge
static test
moving load test
short term viscoelasticity
mechanical behavior
