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.

In order to investigate mechanical characteristics and damage features of the model on sections of two-stage loading composite frame beams,experiments on 4 composite frames were carried out.

Compared with the results of two test specimens,the seismic behavior of HPC composite frame under laterally reversed low-cyclic loading is discussed.

On the basis of full-range nonlinear analysis of 140 composite frames, the effects of different parameters on the moment modulation of prestressed concrete composite frame are discussed with a formula suggested for computing the moment modulation.

Analysis on steel-concrete composite frame beam and the rigidity of composite joints;

Analysis of effective flange width of composite frame beam in negative bending moment area;

Based on the test of composite frame,the effective flange width of composite frame beam is analyzed and the test results are compared with China Code GB50017-2003,Euro Code 4 and British Code BS 5950,which shows that the effective width values from measured strain are bigger than those of the codes while the widths obtained by reverse calculation from the measu.