文档介绍：上海交通大学
硕士学位论文
连续刚构桥收缩徐变内力分析
姓名:刘中剑
申请学位级别:硕士
专业:建筑与土木工程
指导教师:赵金城;王慧东
20080901
摘要
连续刚构桥收缩徐变内力分析
摘要
随着交通事业的迅速发展,我国的桥梁建设亦突飞猛进,大跨度桥
梁特别是大跨度预应力混凝土连续梁、连续刚构组合梁得到了广泛应用。
混凝土的收缩徐变分析是桥梁结构分析中的基本问题。目前已经有
多种较为成熟的计算方法,但是几乎所有的计算理论都是建立在试验研
究的基础之上,并且都有一定的适用范围。
本文主要围绕大跨度连续刚构桥的收缩、徐变内力分析,分别从收
缩、徐变的机理和影响因素,收缩、徐变对结构物性能的影响和收缩、
徐变的计算理论来分析混凝土的收缩、徐变。
混凝土的收缩与徐变受多种因素影响:水泥品种、水灰比、水泥用
量、含水量、骨料、养护条件、外加剂、构件尺寸及环境温度等。混凝
土的收缩徐变及其对结构性能影响的预测和控制是一个十分复杂且难以
获得精确答案的问题,在这些问题当中,包含了相当数量的不确定因素。
在系统的讨论了混凝土收缩、徐变理论之后,又结合工程实例进行
了分析。主要用两种模型的计算结果与该桥梁的实测数据比较,从而得
到处理大跨度连续刚构桥收缩徐变的有效方法。
关键词: 刚构桥,收缩,徐变,内力分析
I
ABSTRACT
INTERNAL FORCE ANALYSIS
OF SHRINKAGE AND CREEP FOR
CONTINUOUS RIGID FRAME BRIDGE
ABSTRACT
With the rapid development of transportation, our country has made
great progress in bridge construction. Lots of long-span bridges have been
built, especially prestressed concrete continuous bridges posite beam
bridges.
The analysis of concrete shrinkage and creep is the basic issue of bridge
structure analysis. There have been a few methods for calculating the
shrinkage and creep, however almost every method is on the basis of
experiment and research, meanwhile, each method has the limits for
application.
The paper is mainly about the shrinkage and creep secondary internal
force analysis of long-span continuous rigid frame bridges. And it contains:
mechanism of shrinkage and creep, factors affecting the shrinkage and creep,
influence of shrinkage and creep on structure appearance, calculating theory
of shrinkage and creep.
II
ABSTRACT
The shrinkage and creep of concrete are affected by lots of factors, such
as breed of cement, water cement ratio, dosage of cement, moisture content,
skeletal materials, curing condition, additives, structural dimensions,
environmental temperature. Forecasting and controlling of shrinkage and
creep are plex problems, so does their influence on structure
performance, both of which are diff