非对称边界下空心板承载力试验与仿真研究

为研究不规范施工对空心板边界条件造成的影响,设计了两端简支(a),三边简支(b)以及两端简支和侧边固结(c)三种非对称边界条件和点荷载和线荷载两种加载方式,对预应力混凝土空心板梁试验构件进行了现场试验。对试验全过程裂缝的发展情况进行观察与分析,并使用Abaqus软件进行非线性模拟仿真验算。分析非对称边界对空心板承载力,延性的影响。试验结果表明：a条件下,试件为跨中弯曲开裂破坏,b和c边界条件下受到非对称边界的影响,空心板梁的破坏模式主要为弯剪扭耦合作用下的空间破坏;b和c边界条件下跨中破坏弯矩分别增长约13%和12%,以破坏时的跨中挠度来衡量延性,延性损失近96%。

Experimental and simulation study on bearing capacity of concrete hollow slabs under asymmetric boundary conditions

To study the impact of irregular construction on the boundary conditions of the hollow core slab, two types of loading conditions (including point loads and line loads) and three asymmetric boundary conditions, namely (a) simple support of two opposite sides, (b) simple support of three sides and (c) simple support of two opposite sides with one lateral side constrained, were designed, so that the field tests were carried out on concrete hollow slabs. Furthermore, three-dimensional nonlinear simulations were performed using the Abaqus software to observe and analyze the whole development process of cracks in detail. The test results show that under the boundary condition (a), the specimen fails in the mode of mid-span bending and cracking; under the boundary conditions of (b) and (c), the failure mode shall be affected by the asymmetrical boundary, and the failure mode of the hollow slab beam appears mainly to be the spatial failure under the combined actions of bending, shear and torsion; under the boundary conditions (b) and (c), the mid-span failure bending moment may increase by approximately 13% and 12% respectively, and the ductility loss shall be nearly 96% when the ductility is measured by the mid-span deflection at failure.