钢板混凝土剪力墙抗剪性能试验研究

Experimental study on shear behavior of steel-plate composite shear walls

完成了2个内嵌钢板混凝土墙试件和3个外包钢板混凝土墙试件在恒定轴压力和往复剪切作用下的拟静力试验,用以研究钢板混凝土剪力墙的抗剪性能。墙试件采用工字形截面,剪跨比为1.2,腹板墙截面含钢率约6%。试验结果表明:试件腹板墙发生剪切破坏;当设计轴压比由0.3提高至0.6时,试件的受剪承载力略有提高,极限位移角减小约20%;在轴压比相同和腹板墙含钢率相近的情况下,外包钢板混凝土墙的变形能力比内嵌钢板混凝土墙大约20%;采用竖向加劲肋-缀条拉结代替栓钉-对拉螺栓连接,外包钢板混凝土墙的受剪承载力差异不大,但变形能力显著增大。对国内外46个钢板混凝土墙试验数据的分析表明,按中国规程JGJ 3—2010《高层建筑混凝土结构技术规程》计算得到的受剪承载力平均为试验值的78%,计算公式偏于安全;而美国规范AISC 341-10和欧洲规范Eurocode 8的计算公式仅考虑钢板的抗剪贡献,计算值仅为试验值的51%,严重低估了钢板混凝土墙的受剪承载力。对大量剪力墙试验数据的分析表明,钢板混凝土墙的剪切变形能力显著优于钢筋混凝土墙和钢骨混凝土墙。

The cyclic shear behavior of steel-plate composite walls was examined through quasi-static tests where two single-plate reinforced composite walls and three double skin composite walls were subjected to axial forces and lateral cyclic loading. All wall specimens had an I-shaped cross section and a steel reinforcement ratio of approximately 6% in the wall web. The shear-to-span ratio of the wall specimens was 1. 2. The following observations were found from the tests. All specimens failed in shear of wall web. When the design axial force ratio of the wall increased from 0. 3 to0. 6,the shear strength of the wall increased slightly,while its ultimate drift decreased by approximately 20%. Under the same axial force ratio and with similar steel reinforcement ratio, the double skin composite walls had the deformation capacity 20% larger than the single-plate reinforced composite walls. Using vertical stiffeners and batten bars instead of headed studs and tie bars for connectors could significantly increase the deformation capacity of the double skin composite walls,although it did not influence the shear strength of the walls. The analysis of test data on46 steel-plate composite walls indicates the JGJ 3—2010 formula produces a conservative estimation of the shear strength,with the estimated strength equal to 78% of the test values on average. As the AISC 341-10 and Eurocode 8formula consider the contribution of steel plates merely,it overly underestimates the shear strength of steel-plate composite walls and the shear strength estimated by the AISC 341-10 and Eurocode 8 formula is 51% of the test values on average. The analysis on a large volume of test data indicates that the shear deformation capacity of steel-plate reinforced composite walls is superior to reinforced concrete walls and steel profile reinforced concrete walls.