高强钢卷带约束钢筋混凝土柱轴向荷载性能研究

IF 0.9 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY PCI Journal Pub Date : 2023-09-01 DOI:10.15554/pcij68.5-01
S. Barbachyn, Anne O’Donnell, A. P. Thrall, Y. Kurama
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引用次数: 0

摘要

本文试验研究了采用双相高强度(100 ksi [690 MPa]屈服强度)钢卷带约束的方形钢筋混凝土柱的轴向荷载行为。在缩小尺寸的试样(8 × 8英寸)上进行了两个阶段的试验。10 × 10英寸。[203 × 203毫米和254 × 254毫米])。不同的参数包括约束类型(条形与钢筋)、约束配筋率、约束布局(箍状和带状、单螺旋、双螺旋)和条形锚固。虽然钢筋约束柱峰后残余强度和延性较好,但重要的发现包括:条形约束柱的峰值强度超过规范所预测的名义轴向强度,条形约束柱能够获得与带钢筋环约束柱相似的归一化峰值强度和峰前刚度,对于8条钢筋布置,需要两个条形螺旋才能达到所需的峰后剩余强度和延性,条形螺旋和条形箍与钢筋环箍相比,可以更好地抑制角杆的屈曲。
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Axial load behavior of reinforced concrete columns with high-strength steel coiled strips as confinement
This paper experimentally investigates the axial load behavior of square reinforced concrete columns confined using dual-phase high-strength (100 ksi [690 MPa] yield strength) steel coiled strips. Two phases of testing were conducted on reduced-scale specimens (8 × 8 in. and 10 × 10 in. [203 × 203 mm and 254 × 254 mm]). Varied parameters include con¬finement type (strip versus reinforcing bar), confine¬ment reinforcement ratio, confinement layout (hoops and ties, single spiral, two spirals), and strip anchor¬age. Although the reinforcing-bar-confined columns demonstrated better postpeak residual strength and ductility, important findings include the following: strip-confined columns had peak strengths exceeding the nominal axial strength predicted by code, strip-con¬fined columns were able to achieve similar normalized peak strengths and prepeak stiffness as columns with reinforcing bar hoop confinement, two strip spirals are necessary to achieve the desired postpeak residual strength and ductility for an eight-bar layout, and strip spirals and hoops may provide better restraint against buckling of corner bars compared with reinforcing bar hoops.
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来源期刊
PCI Journal
PCI Journal 工程技术-结构与建筑技术
自引率
9.10%
发文量
15
审稿时长
>12 weeks
期刊最新文献
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