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偏心荷载作用下,对普通和高强钢管混凝土细长柱进行了37组试验。试验参数包括:混凝土名义强度(30,70及90MPa)、径厚比D/t、偏心率e/D及长细比L/D。将每组试验的极限荷载与欧洲规范4中设计承载力对比,规范规定的混凝土强度为50MPa。通过对比3个性能指标:混凝土贡献率、强度指标及延性指标,确定采用高强混凝土替代普通混凝土的可行性。结果表明:高强混凝土尽管不能提高承载力但能提高延性性能,高强混凝土在此方面是有效的。
Under eccentric load, 37 groups of ordinary and high-strength CFST slender columns were tested. Test parameters include: nominal strength of concrete (30,70 and 90MPa), diameter to thickness ratio D / t, eccentricity e / D and slenderness ratio L / D. Comparing the ultimate load of each group of tests with the design capacity of the European Code 4, the concrete strength specified in the code is 50 MPa. By comparing the three performance indicators: the contribution rate of concrete, strength and ductility indicators to determine the feasibility of using high-strength concrete instead of ordinary concrete. The results show that high strength concrete is effective in this aspect though it can not improve the bearing capacity but can improve the ductility.