Compressive performance of bamboo scrimber and concrete-filled steel tube columns
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摘要: 将轻质高强的重组竹埋入钢管混凝土柱(CFST)的核心形成钢管约束竹-混凝土组合柱(BCFSTs),期望利用钢管的约束作用充分发挥重组竹的抗压强度并延缓其劈裂破坏。为研究BCFSTs的轴压性能,在3组BCFSTs轴压试验的基础上,采用ABAQUS有限元软件建立了相应的模型进行了非线性有限元分析。通过比对试件的破坏形式、荷载-位移曲线等结果,验证了有限元模型的可靠性与适用性;基于验证后的有限元模型,对重组竹尺寸和钢管径厚比两个关键设计变量进行参数化分析。结果表明:在相同钢管壁厚的钢管混凝土柱中,增大重组竹截面尺寸可以抑制荷载-位移曲线峰值点后的下降过程,BCFSTs的峰值承载力相较于CFST的提升范围均在8%以上,最大提升16%;试件的极限荷载呈现明显增长趋势,BCFSTs的极限承载力相较于CFST的最大提升可达到33.2%。钢管壁厚的增加使得重组竹和混凝土受到的环向约束增强,核心截面强度得以提高,钢管壁厚由4.5 mm变化为6.0 mm时,试件极限荷载最大提升18.2%。Abstract: The light and high strength bamboo scrimber was buried in the core of concrete-filled steel tube (CFST) to form bamboo scrimber and concrete-filled steel tube columns (BCFSTs), which was expected to give full play to the compressive strength of the bamboo scrimber and delay its crushing and splitting. In order to study the axial compression performance of BCFSTs, on the basis of three groups of axial compression tests, the corresponding model was established by using ABAQUS finite element software and the nonlinear finite element analysis was carried out. The reliability and applicability of the finite element model were verified by comparing the failure forms and load-displacement curves of the specimens. Based on the verified finite element model, the two key design variables of bamboo scrimber dimension and diameter to thickness ratio of steel tube were parameterized. The analysis results show that: for CFSTs with the same wall thickness, increasing the dimension of bamboo scrimber can inhibit the decline of load-displacement curve after peak point. Compared with CFSTs, the peak load of BCFSTs is increased by more than 8%, and the maximum increase is 16%. The ultimate load of the specimens show a clear growth trend, and the ultimate bearing capacity of the specimens with built-in bamboo scrimber could reach 33.2% compared with that of the CFSTs. With the increase of wall thickness of steel tube, the circumferential constraint of bamboo scrimber and concrete is strengthened, and the core section strength is improved. When the wall thickness of steel tube changes from 4.5 mm to 6.0 mm, the ultimate load of the specimen is increased by 18.2%.
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表 3 重组竹各向异性弹性常数
Table 3. Anisotropic elastic constant of bamboo scrimber
E1/MPa E2/MPa E3/MPa v12 v13 v23 G12/MPa G13/MPa G23/MPa 16880 2688.12 2193.42 0.42 0.41 0.45 558.64 569.31 155.62 Notes: E1, E2 and E3 are the compressive elastic modulus of the material in the x, y and z directions, respectively; v12, v13 and v23 are the Poisson's ratio of the material in the x, y and z planes, respectively; G12, G13 and G23 are the shear modulus of the material in the x, y and z planes, respectively. 表 1 试件基本参数
Table 1. Basic parameters of specimens
Working condition Specimens D T D/T L Working condition Specimens D T D/T L W1 D1 T4.5 C80 114 4.5 25.33 - W3 D2 T6.0 C80 133 6.0 22.17 - D1 T4.5 L30 C80 114 4.5 25.33 30 D2 T6.0 L40 C80 133 6.0 22.17 40 D1 T4.5 L40 C80 114 4.5 25.33 40 D2 T6.0 L50 C80 133 6.0 22.17 50 D1 T4.5 L50 C80 114 4.5 25.33 50 D2 T6.0 L60 C80 133 6.0 22.17 60 D1 T4.5 L60 C80 114 4.5 25.33 60 D2 T6.0 L70 C80 133 6.0 22.17 70 D1 T4.5 L70 C80 114 4.5 25.33 70 D2 T6.0 L80 C80 133 6.0 22.17 80 W2 D2 T4.5 C80 133 4.5 29.56 - W4 D1 T6.0 C80 114 6.0 19.00 - D2 T4.5 L40 C80 133 4.5 29.56 40 D1 T6.0 L30 C80 114 6.0 19.00 30 D2 T4.5 L50 C80 133 4.5 29.56 50 D1 T6.0 L40 C80 114 6.0 19.00 40 D2 T4.5 L60 C80 133 4.5 29.56 60 D1 T6.0 L50 C80 114 6.0 19.00 50 D2 T4.5 L70 C80 133 4.5 29.56 70 D1 T6.0 L60 C80 114 6.0 19.00 60 D2 T4.5 L80 C80 133 4.5 29.56 80 D1 T6.0 L70 C80 114 6.0 19.00 70 Notes: D is the outer diameter of the steel tube; T is the thickness of the steel tube; D/T is the ratio of diameter to thickness of steel tube; L is the dimension of the bamboo scrimber. 表 2 材料基本性能
Table 2. Basic properties of materials
Materials Properties Compressive
strength/MPaElastic
modulus /MPaYield
stress/MPaUltimate
stress/MPaPoisson’s
ratioUltimate
compressive strainPeak
compressive strainDensity/
(kg·m−3)Steel — 205000 381 501.7 0.30 0.047 — 7850 Concrete 85.78 43530 — — 0.20 — 0.002 2427 Bamboo scrimber 98.62 16880 — 99.36 0.41 0.043 — 1301 表 4 BCFSTs试件有限元计算荷载与试验荷载对比
Table 4. Comparison of peak and ultimate load of simulation and test of BCFSTs specimens
Specimens Peak load ρb/% Ultimate load Ncc/kN Ncc'/kN Error value/% Ncu/kN Ncu'/kN Error value/% D1 T4.5 C80 1387.75 1331.13 4.25 0 1387.75 1331.13 4.25 D1 T4.5 L30 C80 1487.32 1497.81 0.70 10.4 1442.22 1356.95 5.91 D1 T4.5 L40 C80 1522.14 1507.67 0.96 18.5 1472.49 1396.78 5.42 D1 T4.5 L50 C80 1547.35 1540.65 0.43 28.9 1602.06 1521.64 5.29 D1 T4.5 L60 C80 1536.52 1544.12 0.49 41.6 1666.13 1658.43 0.46 D1 T4.5 L70 C80 1519.21 1510.46 0.58 56.6 1739.48 1772.62 1.87 D2 T4.5 C80 1677.61 1702.67 1.47 0 1677.61 1702.67 1.47 D2 T4.5 L40 C80 1860.21 1854.49 0.31 13.3 1765.60 1726.26 2.22 D2 T4.5 L50 C80 1921.13 1879.18 2.23 20.7 1827.75 1771.40 3.18 D2 T4.5 L60 C80 1989.02 1938.13 2.62 29.8 1970.29 1908.73 3.23 D2 T4.5 L70 C80 2021.10 1912.82 5.66 40.6 2120.71 1997.48 6.17 D2 T4.5 L80 C80 2006.17 1841.81 8.92 53.0 2167.53 2092.05 3.61 D2 T6.0 C80 2005.17 1973.06 1.63 0 2005.17 1973.06 1.63 D2 T6.0 L40 C80 2137.14 2144.34 0.34 13.9 2087.78 2015.72 3.45 D2 T6.0 L50 C80 2188.63 2182.60 0.28 21.7 2165.67 2094.56 3.39 D2 T6.0 L60 C80 2165.07 2178.21 0.61 31.3 2231.11 2178.32 2.52 D2 T6.0 L70 C80 2143.55 2148.31 0.22 42.6 2409.91 2257.39 6.76 D2 T6.0 L80 C80 2196.31 2140.47 2.61 55.7 2486.18 2419.45 2.76 Notes: Ncc is the test peak load, Ncc' is the numerical simulation peak load; Ncu is the test ultimate load, Ncu' is the numerical simulation ultimate load; Error value=│(test value − simulated value)/simulated value│×100%, ρb = Ab/ (Ac+ Ab), and ρb is the ratio of bamboo scrimber. -
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