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本次试验对高跨比1/6的梁、板厚跨比1/12的两组梁板式筏基模型进行加荷试验。试验表明,梁板基础呈现整体正向挠曲、内部区域反向挠曲特征。荷载通过柱传递至梁,再由梁传递到板,当柱下荷载均匀时,在地基承载力特征值内,地基反力非直线分布,梁下平均反力与柱下平均反力相差不大,约为总平均反力的1.1~1.15倍,板下平均反力小于总平均反力,板格中点处的地基反力约为总平均反力的55%,结构破坏时裂缝出现在板格上表面,裂缝贯通后呈对角线破坏形态;对于角部区域板块,角柱位置的地基反力与平均反力的比值约为1.2,其余部位地基反力均小于平均反力,区格板中心下的反力最小,约为角柱位置的地基反力的40%。结构破坏时梁中部顶面首先开裂,裂缝向下延伸至板边,由板边沿平行于梁的方向向板中心呈渐进式破坏,裂缝贯通后呈十字交叉破坏形态。
In this experiment, two groups of beam-slab raft-based models with 1/6 span ratio and 1/16 slab thickness were tested for loading. Experiments show that the beam foundation presents the overall positive deflection and the reverse deflection characteristics of the inner region. The load is transmitted to the beam through the column and then to the plate. When the load under the column is uniform, the reaction force of the foundation is non-linear within the characteristic value of the bearing capacity of the foundation, and the average reaction force under the beam is not significantly different from the average reaction force under the column , Which is about 1.1-1.15 times the total average reaction force. The average reaction force under the plate is less than the total average reaction force. The reaction force at the mid-point of the plate is about 55% of the total average reaction force. When the structure is damaged, the cracks appear on the plate For the corner plate, the ratio of the foundation reaction force to the average reaction force at the corner column is about 1.2, and the remaining part of the foundation reaction force is less than the average reaction force. The thickness of the grid plate The reaction force under the center is the smallest, which is about 40% of the foundation reaction force at the corner post. When the structure is destroyed, the top of middle part of the beam will crack first, and the crack will extend down to the edge of the plate. The edge of the plate will gradually descend toward the center of the plate parallel to the beam.