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首页> 外文期刊>Engineering Structures >Steel-concrete composite floor systems with different structural and loading configurations under a corner column removal scenario: Experimental tests
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Steel-concrete composite floor systems with different structural and loading configurations under a corner column removal scenario: Experimental tests

机译：钢混凝土复合地板系统在角柱去除场景下具有不同的结构和装载配置：实验测试

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In this study, quasi-static tests were performed on three 3D steel-concrete composite floor systems under a column removal scenario with two variables, i.e., secondary beam connection type and pre-existing axial loads on columns. The work focused on the behavior of the three composite floor systems, including the load-deflection response, failure mode, load-resisting mechanism, e.g., flexure, catenary action and tensile membrane action (TMA), and load redistribution. It was found that secondary beam connection had a pronounced effect on the load-deflection response. Pre-existing axial loads on columns significantly influenced the load redistribution process and intensified the stresses in adjacent columns connected by the secondary beam to the removed column. For all the three specimens, a peripheral compressive ring with TMA was not observed in the composite slab due to a lack of rotational restraint from the perimeter beams and the main girder. However, at large deformation stage, when the composite slab deformed into an approximate hyperbolic-parabolic surface, the entire reinforcing mesh in the slab was in tension. It was observed that, at the early stage, the applied load was mainly resisted by flexure in the slab and the main composite girder and the secondary composite beam connecting to the removed column. But at large deformation stage, part of the applied load was resisted by flexure in the partially damaged slab and the main girder, and the intact secondary beam. Other load-carrying contributions came from catenary action in the main girder and TMA in the slab. In the end, most of the applied loads were redistributed to the columns adjacent to the removed column.
机译：在本研究中，在三维钢 - 混凝土复合地板系统下进行准静态测试，其中柱去除场景有两个变量，即次级光束连接类型和列上的预先存在的轴向载荷。该工作集中在三种复合地板系统的行为，包括负载偏转响应，故障模式，负载抵抗机构，例如弯曲，凸起的作用和拉伸膜作用（TMA），以及负荷再分配。发现二次光束连接对负载偏转响应具有明显的影响。柱上的预先存在的轴向载荷显着影响了负载再分配过程，并加强了由二次光束连接到移除的柱连接的相邻柱中的应力。对于所有三个样本，由于缺乏周边梁和主梁，在复合板中未观察到具有TMA的外围压缩环。然而，在大的变形阶段，当复合板坯变形成近似双曲抛物表面时，板中的整个加强网格张力。观察到，在早期阶段，施加的负载主要通过板坯中的弯曲和连接到移除的柱的主复合梁和第二复合梁的弯曲抵抗。但在大变形阶段，部分施加的载荷部分通过部分损坏的板坯和主梁和主要的二射梁抵抗弯曲。其他负载捐款来自板坯中的主要梁和TMA中的脉链作用。最后，大部分施加的载荷被重新分配到与移除的柱相邻的列。

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