| 高丹盈,雷杰,海慧.钢纤维高强混凝土三桩承台受力性能及承载力计算方法[J].水利学报,2015,46(2): |
| 钢纤维高强混凝土三桩承台受力性能及承载力计算方法 |
| Mechanical behavior and bearing capacity calculation method of steel fiber reinforced high strength concrete three-pile caps |
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| DOI： |
| 中文关键词: 三桩承台 钢纤维 高强混凝土 试验 承载力计算 |
| 英文关键词: three-pile caps steel fiber high strength concrete experiment bearing capacity calculation |
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| 中文摘要: |
| 为了探讨钢纤维高强混凝土三桩承台的受力性能和破坏机理，通过10个平面尺寸为831 mm×831 mm×831mm、厚度为200～400 mm的钢纤维高强混凝土三桩承台试验，测试了承台的裂缝开展、破坏形态、荷载-挠度曲线、混凝土和钢筋应变，分析了钢纤维体积率、承台有效厚度、配筋率和配筋方式以及混凝土强度对承台承载力的影响。结果表明，钢纤维高强混凝土三桩承台发生冲切破坏，符合桁架拱受力机理。随着钢纤维体积率和承台有效厚度的增加，承台承载力明显提高，配筋率和配筋方式对承台承载力也有一定影响。根据试验研究和理论分析，提出了与普通混凝土三桩承台承载力计算方法相衔接的钢纤维高强混凝土三桩承台承载力计算模型和公式，为完善CECS38：2004《纤维混凝土结构技术规程》提供了依据。 |
| 英文摘要: |
| The experiments of 10 specimens of steel fiber reinforced high strength concrete （SFHSC）three-pile caps， which have the plane dimensions of 831 mm×831 mm×831 mm and the varied thickness from 200mm to 400mm， were conducted. The crack distribution， load-deflection curve， concrete strain and longitudinal reinforcement strain of pile caps were measured. The factors，such as the steel fiber volume ratio，effective thickness，reinforcement ratio and reinforcement layout，and the concrete strength，on the bearing capacity of the pile caps were analyzed. The results indicate that the failure mode of the SFHSC three-pile caps is the punching failure， and its transfer mechanism can be similar to strut-and-tie model.With the increase of the steel fiber volume ratio and the effective thickness， the bearing capacity of pile caps improves evidently. The reinforcement ratio and reinforcement layout also have some effects on the bearing capacity of pile caps. Based on the experimental research and theoretical analysis，the relative formula is put forward for calculating the bearing capacity of SFHSC three-pile caps in conjunction with that of HSC three-pile caps， which can serve as a reference for the‘Technical Specification for Fiber Reinforced Concrete Structure’in China. |
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