摘要
混合结构房屋现浇楼板经常出现非荷载性裂缝问题。针对裂缝发生原因和发展规律,分别进行了试验研究和有限元数值分析。试验按圈梁和构造柱的有无,建造了两种结构形式、共4块楼板的足尺模型;有限元分析则对试验模型进行了线性和非线性仿真分析,并将两者结果进行对比分析。研究表明,混凝土收缩受约束是楼板开裂的主要原因;板角斜裂缝是主要裂缝形式;圈梁和构造柱对裂缝影响不明显;控制楼板混凝土收缩量并充分利用其徐变或应力松弛特性可使裂缝的发生率降到最低。
Non-living-load cracks problems occur frequently in cast-in-situ RC floor slabs of combination structure buildings. Focusing on the reasons and development regularity of the slab cracks, experiment research and finite element analysis have been performed. Two full scale models were built in the experiment, including 2 structural types one is with ring beams and constructional columns, the other is without them. 4 experimental floor slabs were test. Linear and nonlinear finite element method had been used to analyze the experimental models and compare the results with the experiment＇s. The research shows that, the restrained shrinkage of slab concrete is the main reason causing cracks; the main form of slab crack is diagonal crack near slab comer; ring beams and constructional columns have little notable influence to the slab cracks; controlling the concrete shrinkage and utilizing its specificity of creep or stress relaxation specificity properly may be the effective measures to minimize the occurring rate of slab cracks.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2007年第4期97-103,共7页
Journal of Building Structures
基金
广西科技攻关项目(桂科计字[2001]第1号文)
关键词
混合结构
现浇楼板
裂缝
试验
模型
有限元法
combination structure
cast-in-situ RC floor slab
crack
experiment
model
finite element method
