一种新型基础的基底反力及内力测试

用GYH-2型单膜式压力传感器和GJL-2型钢筋计测试了一种被称为“构造板扩展基础”的新型基础基底反力及内力,掌握了第一手动态监测数据,总结出该种基础基底压力的分布规律和基础内力的实际状态.测试结果表明,构造底板能承担30%左右的上部荷载,钢筋受力处于交变应力状态,最大拉应力出现在柱上板带跨中处,应力最大值不超过钢筋设计强度的22%.这一结论可为构造板独立基础的设计提供直接参考依据.

Testing for Ground Back Pressure Acting on Bottom of a New-Type Foundation and Its Stress Distribution

The GYH-2 membrane case manometer and GJL-2 reinforcement stressometer were used to test the ground back pressure acting on the bottom of a new-type spread foundation integrated with concrete slab and its stress distribution. First-hand dynamic data were thus monitored and recorded to generalize the actual distributions of the back pressure and foundation's stress. Testing results showed that the concrete slab can take on about 30% load of upper structure; stress of reinforcements change alternately; the maximum tensile stress occurs at the midspan of slab and the maximum value of stress is about 22% lower than allowable strength of reinforcements. This conclusion offers directly a reference for designing the spread foundation integrated with concrete slab.