钢筋混凝土板极限承载力对比分析

王勇¹, 董毓利², 邹超英¹

(1.哈尔滨工业大学 土木工程学院,150090 哈尔滨; 2.华侨大学 土木工程学院, 361000 福建 厦门)



摘要:

为了能够简单准确地确定钢筋混凝土板的承载能力,在经典塑性铰线理论基础上,考虑受拉薄膜效应的影响,基于所提出的应力破坏准则,建立修正板块平衡法;同时,结合大挠度板壳单元和弹塑性理论,建立了非线性有限元分析程序．采用上述两方法对钢筋混凝土双向板的极限承载力进行计算,并将计算结果和试验结果进行对比分析．结果表明:由于考虑了受拉薄膜效应,两种方法所得极限承载力计算值均与试验结果吻合较好;与有限元分析方法相比,修正板块平衡法原理较为简单,计算容易,具有较强的工程应用价值．

关键词:  钢筋混凝土板  修正板块平衡法  有限元分析  极限承载力  破坏准则

DOI：10.11918/j.issn.0367-6234.2013.08.001

分类号:

基金项目:国家自然科学基金 (51178143); 高等学校博士点专项基金 (20102302110043).



Comparative analysis of limit carrying capacity of reinforced concrete slabs

WANG Yong¹, DONG Yuli², ZOU Chaoying¹

(1.School of Civil Engineering, Harbin Institute of Technology, 150090 Harbin, China;2. School of Civil Engineering, Huaqiao University, 361000 Xiamen, Fujian, China)

Abstract:

To accurately determine the limit carrying capacity of reinforced concrete slabs, based on the classical yield-line theory and previously proposed stress failure criterion, this paper presents the modified segment equilibrium method which incorporated the effect of the tensile membrane action. Additionally, the nonlinear finite element procedure was established according to the flat shell element and elastic-plastic theory. The two methods were used to calculate the limit load carrying capacity of reinforced concrete two-way slabs, and comparison between the calculated results and experimental results were conducted. This study shows that the two methods were clearly capable of predicting the load carrying capacity of the concrete slabs with reasonable accuracy, because the tensile membrane action was taken into account in the two models. Compared with the finite element model, the present method has strong engineering application value, due to its simple principle.

Key words:  reinforced concrete slab  modified segment equilibrium method  finite element analysis  limit carrying capacity  failure criterion