推荐回答（3个）
此图主要针对03G101第41页中的注释前半句讲的，底层柱柱根系指地下室顶面或无地下室情况，柱箍筋加密区大于等于该层柱高的1/3。
但是有一种情况就是基础地面位于基础柱上面较高埋深位置时，（即基础地面下还埋深有很高基础柱的情形），则必须满足第41页注释的条文中的两方面。
主要是柱子的埋置深度，如果大加密就必须按此要求。就是加密区在地面有刚性层时必须要再加密，必须上下各加密500。
你只要搞清了什么是刚性地面 那么这副图就好理解了
刚性地面一般指的是有混凝土面层（包括道路所用的沥青混凝土）、石板面层、硬质材料地面板的地面属刚性地面同时对首层楼板附着于房心土回填之上的地面都可以作为刚性地面.
很明显，这副图指的是首层附着于房心土之上的地面。 因为此图并没有标示柱帽，如果是无梁楼板的话（板直接锚在柱子上）就必须要做柱帽，所以此图并不是无梁楼盖的结构。但此图它也不是有梁楼盖的结构。如果是有梁楼盖的结构的话，就应该是板先传力给梁，梁再传力给柱子的受力关系。做法也是板锚入梁、梁锚入柱。柱子在楼层标高处的纵横四个方向周边应该是梁，而不能直接画板。就如03G101上P40页的这副图旁的另外一张图一般。你看看，那张图上的柱子在楼层标高处画的就是梁而不是直接画的板。那张图很明显的就是有梁楼板。 所以你在提问中给出的这张图的刚性地面所指的就是既然不是无梁楼盖也不是有梁楼盖这两种情况那就只有是第三种直接附着于房心土的情况。这种受力情况就是，楼板直接把力传给它底下夯实的土上，并不与柱子产生传递竖向向下荷载的情况。只是从抗震角度考虑到土壤对柱子的挤压产生的破坏，所以要在楼板上下各50公分的范围内进行箍筋加密。
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