EXPERIMENTAL AND STUDY ON ECCENTRIC COMPRESSIVE PERFORMANCES OF REINFORCED CONCRETE COLUMNS WITH REBAR HRB635
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摘要: 635 MPa级热轧带肋高强钢筋是一种采用热轧工艺微合金化的新型高强金属材料,与热处理或冷加工高强钢筋相比具有强度高、延性好、成本低等显著优势。为研究635 MPa级热轧带肋高强钢筋混凝土柱的偏压受力性能,对20根635 MPa级热轧带肋高强钢筋混凝土柱展开偏压试验,试验参数为偏心率、纵筋配筋率、箍筋强度和高宽比,揭示其典型破坏模式和受力机理和荷载-挠度曲线以及应变分布规律。研究结果表明:635 MPa级热轧带肋高强钢筋混凝土柱偏心受压的破坏模式主要包括大偏心和小偏心受压破坏,其偏压承载力随着偏心距和高宽比的减小而增大,随纵筋配筋率和箍筋强度的增大而增大;其延性随着箍筋强度和纵筋配筋率的提高而明显改善。对GB 50010—2010《混凝土结构设计规范》(2015版)的承载力计算值与试验值进行比较,结果显示采用GB 50010—2010(2015版)可以较准确地评估635 MPa级热轧带肋高强钢筋混凝土柱偏压承载力。
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关键词:
- 635 MPa级热轧带肋高强钢筋 /
- 偏压试验 /
- 破坏形态 /
- 受力机理 /
- 承载力计算
Abstract: Hot-rolled ribbed steel bars of 635 MPa are a new high-strength metal material produced by hot rolling and micro-alloying processes. Compared with heat-treated and cold-rolled high-strength steel bars, they have significant advantages of high strength, good ductility, low cost. In order to study the eccentric compressive performances of concrete columns reinforced with hot-rolled ribbed high-strength rebars of 635 MPa, a total of 20 high-strength reinforced concrete columns with hot-rolled ribbed high-strength rebars of 635 MPa were tested under the eccentric loading. The test parameters were load eccentricity ratios, longitudinal reinforcement ratios, stirrup strength and aspect ratios. The typical failure modes and mechanical properties of the columns were revealed as well. Moreover,deflection curves of columns subjected to eccentric compressive loads and development rules of cross-section strain were obtained. The results indicated that the failure modes of the columns with hot-rolled ribbed high-strength rebars of 635 MPa mainly included compressive failures subjected to large or small eccentric loads. The eccentric compressive strength of columns was enhanced with the decrease of the load eccentric ratios and the aspect ratios, and with the increase of the longitudinal reinforcement ratios and the decrease of stirrup strength. The ductility properties of the columns were obviously improved with the increase of the stirrup strength and the longitudinal reinforcement ratios. Based on the code of GB 50010-2010, the predicted eccentric strength of the columns was compared with those by the experiments. The results showed that the current code could be used to evaluate the eccentric bearing capacity of reinforced concrete columns with high-strength hot-rolled rebars of 635 MPa accurately. The study might provide scientific reference for application of the hot-rolled ribbed high-strength rebars of 635 MPa in concrete structures.-
Key words:
- HRB635 /
- eccentric compressive test /
- failure mode /
- mechanical mechanism /
- design of bearing capacity
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