摘要
针对体系复杂或体型超长的混凝土结构受整体温差收缩效应的影响问题,通过合理设置后浇带及其后合拢方法、合理模拟地基或桩基的有限约束刚度、合理考虑混凝土结构的长期收缩徐变性质,并结合施工进度的合理规划细化各阶段生成结构组的温差荷载取值,推导建立了考虑时间效应及工程施工全过程乃至全寿命周期的结构温差收缩效应求解的非线性有限元方法。在有限元软件二次开发的基础上,该方法应用于国内外多个大型复杂工程结构计算分析中,表明该方法能较准确合理地揭示混凝土结构自施工开始至使用期各阶段温差收缩效应的分布变化规律,从而可针对各时期受力最不利或变形较大的结构构件提出合理的设计优化建议及相应的施工控制措施,具有良好的工程实用性。
A set of time-dependent nonlinear FEM is set up for working out reasonably the structural integral temperature variation effect on the complex or over-length concrete buildings, through the whole construction and service life. In this method, it is included as the following： the optimization of concrete post-cast strip, the reasonable simulation of finite restraint stiffness of the groundwork or pile foundation, the concrete inherent creep and shrinkage effects, and the detailing of temperature loads in different stages and structural groups. Based on the secondary development of the FEA software, this method has been applied into practical complex structural analysis. It shows that the method could reveal the temperature variation effect through the whole generative process of the concrete structure reasonably and effectively, and is practical and helpful to find out the over-deformed or over-stressed structural members and could offer the corresponding optimized design suggestion and construction measures.
出处
《建筑科学》
北大核心
2014年第11期81-87,共7页
Building Science
基金
国家自然科学基金项目(51308117)
国家自然科学基金项目(50578096)
关键词
超长混凝土结构
温差效应
收缩徐变
施工模拟
有限刚度
非线性有限元法
over-length concrete structure
temperature variation effect
concrete creep and shrinkage
construction simulation
finite stiffness
nonlinear finite element method
