无地下室框架结构嵌固端位置的确定方法

A method for determining the location of embedded end in frame structures without basement

对常见框架结构的计算模型进行对比分析,根据不同模型的剪力、位移等计算结果来分析无地下室框架结构嵌固端位置的确定原则及确定方法,所得结论可为同类型框架结构设计提供参考。第一种情况,当首层地面可设置框架梁时,建议嵌固端取在一层地面梁顶,按考虑了地面框架梁的模型进行结构计算与配筋,该方法可避免首层层高过高而出现软弱层的问题,且计算模型与真实结构及结构在地震后的实际损坏情况更相符,需注意的是该层地面梁设计应符合框架梁的抗震要求;第二种情况,当首层地面无法设置框架梁时,可参考排架结构预制钢筋混凝土柱高杯口基础的形式将地面下柱截面加大按照短柱基础设计,此时嵌固端取在短柱顶面,该方法也可避免首层层高过高而出现软弱层的问题。

The calculation models of common frame structures are compared and analyzed.According to the calculation results of shear force and displacement of different models,the principles and methods for determining the position of embedded end of frame structures without basement are analyzed.The conclusions can provide reference for the design of the same type of frame structures.In the first case,when frame beams can be installed on the ground floor of the first floor,it is recommended to take the embedded end on the top of the ground beams on the first floor,and perform structural calculation and reinforcement according to the model considering the ground frame beams.This method can avoid the problem that the first floor is too high and the weak layer appears,and the calculation model is more consistent with the actual structure and the actual damage of the structure after the earthquake.It should be noted that the design of the ground beam of this layer should meet the seismic requirements of the frame beam..In the second case,when the frame beam cannot be set on the ground on the first floor,the section of the column under the ground can be enlarged by referring to the form of the high cup-mouth foundation of the prefabricated reinforced concrete column of the bent frame structure,according to the design of the short column foundation.The top surface of the short column,this method can also avoid the problem that the first floor is too high and the weak layer appears.