基于能量损失平衡的轻骨料混凝土深受弯构件受剪分析

发布时间：2018-01-20 01:46

本文关键词： 轻骨料混凝土深受弯构件受剪能力能量平衡理论尺寸效应　出处：《工程力学》2017年09期 　论文类型：期刊论文

【摘要】：尺寸效应对轻骨料混凝土深受弯构件受剪能力影响显著,现有规范和典型抗剪模型均未准确考虑。结合拉压杆模型和裂缝带处能量损失平衡理论,建立了深受弯构件受剪计算模型;在已有大量普通混凝土构件试验研究基础上,量化深受弯构件斜压杆中混凝土项和钢筋项的作用,简化模型,并通过与多国规范建议模型对比分析,验证模型的准确性;进而,考虑轻骨料混凝土与普通混凝土的受剪破损差异,修正模型,结合已完成8根轻骨料混凝土深受弯构件受剪性能试验研究,得到适用于轻骨料混凝土深受弯构件且考虑尺寸效应影响的计算模型。研究表明:基于能量损失平衡建立的深受弯构件的拉压杆模型计算结果较各国规范和Tan-Cheng模型更接近试验值,能够准确预测轻骨料混凝土深受弯构件受剪能力,并合理考虑尺寸效应,具有明确的力学概念。
[Abstract]:The size effect has a significant effect on the shear capacity of heavy flexural members of lightweight aggregate concrete. The existing codes and typical shear models are not considered accurately. Combined with the tension and compression bar model and the energy loss balance theory of crack zone. The shear calculation model of deep bending member is established. On the basis of a large number of experimental studies of ordinary concrete members, this paper quantifies the action of concrete and steel items in inclined compression bar of deep flexural members, simplifies the model, and compares the model with the model suggested by many countries. Verify the veracity of the model; Furthermore, considering the difference of shearing damage between lightweight aggregate concrete and ordinary concrete, the model is revised and the shear behavior of 8 lightweight aggregate concrete members subjected to deep bending has been studied. A calculation model of lightweight aggregate concrete with the effect of size effect is obtained, which is suitable for the deep bending members of lightweight aggregate concrete. The results show that:. The calculated results of the tension and compression bar model based on energy loss balance are closer to the experimental values than those of the national specifications and Tan-Cheng models. The shear capacity of lightweight aggregate concrete subjected to bending can be accurately predicted, and the size effect can be considered reasonably, so it has a clear mechanical concept.
【作者单位】：长安大学建筑工程学院;
【基金】：国家自然科学基金项目(51578072) 陕西省科技统筹创新工程计划项目(2015KTZDSF03-04) 陕西省自然科学基金项目(2016JM5070,2017JQ5092) 中央高校基本业务费项目(310828163410,310828161006)
【分类号】：TU37
【正文快照】： 轻骨料混凝土(Lightweight Aggregate Concrete,LWAC)具有轻质高强、保温隔热、耐火抗冻、节能环保等诸多优点,具有良好的应用前景。目前,挪威、美国、日本等代表性国家已将其广泛用于桥梁工程、高层建筑、海洋平台等建设,取得了显著的经济与环境效益。但也存在弹性模量低、易

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