叠合梁框架柱与整浇框架柱的对比分析

根据两榀叠合梁框架、一榀整浇框架的实测资料，采用对比分析的方法，对叠合梁框架柱和整浇框架柱的受力性能及变形特征进行对比分析。结果表明，叠合梁框架柱的截面应变符合磁截面假定，柱的承载力并不因梁的叠合施工工艺和二阶段受力而降低；柱端钢筋和混凝土的应变在弹性阶段均滞后于整浇框架，底层柱的反弯点低于整浇框架柱。

Comparative Analysis and Study on Mechanical Behavior and Deformation in Columns of Composite Beam Frames

On the basis of the experimental information on two composite beam frames and one cast in place frame, this paper analyzes in detail mechanical behavior and deformation of columns in composite beam frames by way of comparative study. Results of analysis show that strain of section in the columns of composite beam frames is in line with the assumption of strain .The bearing capacity of columns is not reduced by construction techniques and two stage loading of beams, the strain of columns in composite beam frames appears later than that in cast in place frame at elastic stage. Inflecture point of column lied lower than that of cast in place frame. Going into elastic plastic stage, the preceding tensile strain of tensile reinforcing bars in side columns of composite beam frames is quite obvious. The main cause of preceding tensile strain is due to the reduction of joint rigidity. Some measures are presented to avoid the reduction of joint rigidity in this paper, which are quite instructive for engineering practice.