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首頁> 美國衛(wèi)生研究院文獻>Materials >Degradation of Axial Ultimate Load-Bearing Capacity of Circular Thin-Walled Concrete-Filled Steel Tubular Stub Columns after Corrosion
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Degradation of Axial Ultimate Load-Bearing Capacity of Circular Thin-Walled Concrete-Filled Steel Tubular Stub Columns after Corrosion

機譯：圓形薄壁鋼管混凝土短柱的軸向極限承載力衰減

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This work aimed to investigate the effects of steel tube corrosion on the axial ultimate load-bearing capacity (AULC) of circular thin-walled concrete-filled steel tubular (CFST) members. Circular thin-walled CFST stub column specimens were made of steel tubes with various wall-thicknesses. These CFST column specimens were subjected to an accelerated corrosion test, where the steel tubes were corroded to different degrees of corrosion. Then, these CFST specimens with corroded steel tubes experienced an axial static loading test. Results show that the failure patterns of circular thin-walled CFST stub columns with corroded steel tubes are different from those of the counterpart CFST columns with ordinary wall-thickness steel tubes, which is a typical failure mode of shear bulging with slight local outward buckling. The ultimate strength and plastic deformation capacity of the CFST specimens decreased with the increasing degree of steel corrosion. The failure modes of the specimens still belonged to ductile failure because of the confinement of outer steel tube. The degree of steel tube corrosion, diameter-to-thickness ratio, and confinement coefficient had substantial influences on the AULC and the ultimate compressive strength of circular thin-walled CFST stub columns. A simple AULC prediction model for corroded circular thin-walled CFST stub columns was presented through the regression of the experimental data and parameter analysis.
機譯：這項工作旨在研究鋼管腐蝕對圓形薄壁混凝土填充鋼管（CFST）構(gòu)件的軸向極限承載力（AULC）的影響。圓形薄壁CFST短柱標本由具有各種壁厚的鋼管制成。這些CFST柱標本經(jīng)過加速腐蝕測試，其中鋼管被腐蝕到不同程度的腐蝕。然后，這些帶有腐蝕鋼管的CFST試樣進行了軸向靜載荷測試。結(jié)果表明，圓形薄壁鋼管混凝土短管柱的腐蝕模式與普通壁厚鋼管CFST短管柱的破壞模式不同，這是典型的剪切脹大局部屈曲的破壞模式。 CFST試樣的極限強度和塑性變形能力隨著鋼腐蝕程度的增加而降低。由于外鋼管的約束，試件的破壞模式仍屬于延性破壞。鋼管的腐蝕程度，直徑/厚度比和約束系數(shù)對圓形薄壁CFST短管柱的AULC和極限抗壓強度有重大影響。通過對實驗數(shù)據(jù)的回歸分析和參數(shù)分析，提出了一種簡單的圓弧薄壁CFST短管柱AULC預(yù)測模型。

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