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请问基础梁下的回填土不允许夯实的原因是什么啊？ - 工程施工 - 项目管理 - 氿上知道
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满意答案
1、假设基础梁下没有任何东西，也就是悬空的，画一下梁的弯矩图。
2、假设基础梁下回填土是夯实的，当基础梁承受上部荷载时，基础梁是必要向下弯曲，反过来讲，回填土必给基础梁一个反作用力，当反作用力大于上部荷载时，画一下梁的弯矩图。
3、而基础梁的配筋，在旧的设计规范中通常是梁上部配筋小，梁下部配筋大，原因就是按第一种情况的弯矩图配的。这样当出现第二种情况时，基础梁就会上面受拉，出现梁被破坏的可能。
值得注意的是：现今设计人在设计基础梁时，通常都是上下部梁筋根数、截面一样大，也就是说考虑了梁下部受压的情况，也是防止反力作用对梁的破坏。
尽管如此，作为施工人员，仍应按不安全因素考虑，将设计人的设计防范作为一种安全储存才对，同时也提高了施工人对结构受力原理的理解。
时令123
回答于：2013-09-03
共2条回答