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NUMERICAL SIMULATION OF CRACKING OF OVERLONG FRAME STRUCTURE AT DETEMPERATURE EFFECT
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摘要: 目前，超长框架结构楼板的温度应力分析大都集中于混凝土的线弹性阶段。利用钢筋混凝土非线性有限元的开裂模型，对模板在降温条件下的开裂过程进行数值模拟，并与实际工程的观测结果和工程中采用简化模型的计算所得结果进行比较，表明采用非线性有限元开裂模型能够较好地估测结构降温引起的应力分布，以及由此而引起的开裂位置及方向，对工程设计和实践有一定的指导意义。Abstract: At the present most of the temperature stress analyses are conducted at the linear elastic stage of a concrete.A numerical simulation of the cracking process of a beam-slab structure at detemperature is carried out using nonlinear FEM crack model of reinforced concrete, whose results are compared with the observations of actual projects and the calculated ones of a simplified model.It is proved that the stress distribution due to the structures detemperature, and the position and direction of the cracks due to which can all be estimated properly by this model.Which provides a guidance to engineering design and practice.
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Key words:
- overlong frame structure /
- crack model /
- temperature stress
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[2] 陈胜祥.现浇大跨度框架结构屋面板裂缝的研究与防治.营建技术,1981(1) 王铁梦.工程结构裂缝控制.北京:中国建筑工业出版社,1994.433～434 [3] 过镇海.钢筋混凝土原理.北京:清华大学出版社,1999.107～109 [4] 尼尔森.钢筋混凝土有限元分析.周氏,等译.南京:河海大学出版社,1988.98～109 [5] 江见鲸.钢筋混凝土非线性有限元分析.西安:陕西科学技术出版社,1994.118～119 [6] Gilbert R I, Warner R F. Tension Stiffening in Reinforced Concrete Slabs.Journal of the Structural Division, American Society of Civil Engineers,1978(104) :1885～1900 [7] Crisfield M A. A Fast Incremental/Ieration Solution Procedure that Handles Snap-Through. Computers and Structures, 1986 (22): 751～767 [8] Powell G, Simons J. Improved Iterative Strategy for Nonlinear Structures.International Journal for Numerical Methods in Engineering, 1981 (17):1455～1467 -
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