Modelling of bonded post-tensioned concrete slabs in fire
Modelling of bonded post-tensioned concrete slabs in fire
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DOI：
10.1680/stbu.2008.161.6.311
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
E. Ellobody;C. Bailey
中科院分区：
文献类型：
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作者：
E. Ellobody;C. Bailey
本文提出了一个有限元模型，突出的行为有粘结后张单向跨混凝土板在火灾条件下。该模型进行了验证，对10个有粘结的后张混凝土板在环境温度和高温下的火灾试验。板采用15·7 mm标称直径的七丝单股钢筋束进行简单支撑和后张。整个板的组件，包括混凝土，塑料和镀锌钢管，预应力筋和锚具的机械和热材料的非线性，已被仔细插入到模型中。还考虑了钢筋束和周围灌浆之间的界面，允许对粘结行为进行建模，并允许钢筋束在板变形期间保持其轮廓形状。整个板坯的温度分布，连同板坯的发展的位移和应力，因为它是加热，预测模型和验证对测试数据。A parametr.
This paper presents a finite element model highlighting the behaviour of bonded post-tensioned one-way spanning concrete slabs in fire conditions. The model was verified against ten fire tests on bonded post-tensioned concrete slabs at ambient and elevated temperatures. The slabs were simply supported and post-tensioned with 15·7 mm nominal diameter seven-wire mono-strand tendons. The mechanical and thermal material non-linearities of the entire slab’s components, consisting of the concrete, plastic and galvanised steel ducts, prestressing tendon and the anchorages, have been carefully inserted into the model. The interface between the tendon and surrounding grout was also considered, allowing the bond behaviour to be modelled and the tendon to retain its profile shape during the deformation of the slab. The temperature distributions throughout the slab, together with the slab’s development of displacement and stress, as it was heated, were predicted by the model and verified against test data. A parametr...