采用短柱基础的多层框架设计探讨

Design of multilayer frame structure with puncheon foundation

短柱基础可有效减小底层柱计算长度,满足底层侧向刚度要求。对多层框架采用不同高度及截面尺寸的短柱基础与按以短柱顶为嵌固端进行简化计算分析比较,结果表明不能按以短柱顶为嵌固端进行简化计算。通过工程设计实例介绍了采用短柱基础的多层框架的设计方法,即设计时可将短柱层设为一个结构层,再将上部结构嵌固于短柱顶及基础顶分别进行计算,一层梁、柱按两次计算结果的较大值进行设计配筋,其他构件按有短柱层计算结果设计配筋。

By using puncheon foundation, the effective length of bottom columns can be reduced and lateral stiffness of bottom layer meet requirements of the code. Compared simplified calculation results of muhilayer frame with application of different height and size puncheon foundation and set the embedded end on the top of puncheon foundation show that it is improper to set the embedded end on the top of puncheon foundation. The design method of multilayer frame with puncheon foundation was introduced based on practical projects as follows. Puncheon foundation can be set to a structure layer, and then set the embedded end of superstructure on the top of puncheons or the top of the foundation separately to calculate. Beams and columns in first layer are reinforced according to larger calculated values of models with different embedded end locations and other components are reinforced according to calculated values of the model with puncheon foundation.