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| 基于修正压力场理论的活性粉末混凝土梁受剪分析 |
| Shear Capacity of Reactive Powder Concrete Beam Based on Modified Compression Field Theory |
| 投稿时间：2018-04-24 修订日期：2018-05-12 |
| DOI： |
| 中文关键词: 修正压力场理论 活性粉末混凝土 HRB500级纵筋 梁 抗剪分析 |
| 英文关键词: modified compression field theory RPC HRB500 reinforcement beam shear analysis |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 在Vecchio和Collins分析普通混凝土板受纯剪作用时所提出的修正压力场理（MCFT）理论的基础上，叠加弯矩作用，考虑到活性粉末混凝土(RPC)材料的特殊性，对裂后RPC的本构关系以及平衡假定等进行了修正，建立了RPC梁在弯剪复合作用下的截面分析模型，利用该模型对考虑不同剪跨比、钢纤维体积率、配箍率、配筋率以及纵筋强度的12根HRB500级纵筋RPC试验梁进行了抗剪分析，并与试验结果进行对比论证，结果表明：该模型能很好地模拟整个试验加载过程，抗剪极限承载力的计算结果以及变化趋势与实测值都吻合较好，计算所得的箍筋平均应变在加载后期能表现出弹塑性变化的趋势，RPC受拉本构关系的精准性对模型预测的精准性起主要影响，该模型对剪跨比适中，以“剪压破坏”形态为主的构件最为适用。 |
| 英文摘要: |
| Based on modified compression field theory（MCFT）, a sectional analysis model for reinforced concrete membrane element under pure shear which was proposed by Vecchio and Collins, a new sectional analytical model for reactive powder concrete (RPC) beams under the combined action of bending moment and shear was established. Because the characteristics of RPC were considered in the mode, the constitutive relation of RPC after cracking and equilibrium hypothesis were corrected. Twelve HRB500 reinforced RPC beams which worked on concentrated load were analyzed by this model. The influence of shear?span ratio, steel fiber content, stirrup ratio, reinforcement ratio and reinforcement strength was considered. The results of the model were compared with the experimental results. The results show that: The model can simulate the whole test loading process very well. The calculation results and the change tendency of the ultimate shear capacity are in good agreement with the measured values. The calculated average strain of stirrups shows a trend of elastic-plastic change at the later stage of loading. RPC tension constitutive relation plays a major impact on the accuracy of the model prediction. The model is more suitable for the components which occurs shear compression failure. |
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