组合框架梁有效翼缘宽度试验分析

钢与混凝土组合梁的设计和分析中,通过引入有效翼缘宽度的概念考虑混凝土翼板中剪力滞后的影响。在组合框架的试验基础上,对组合框架梁的有效翼缘宽度进行了分析,并与我国规范GB50017—2003、欧洲规范4和英国规范BS 5950计算结果进行比较。结果表明,由试验实测应变计算的有效宽度均大于规范取值,而由实测挠度反算的有效宽度均小于规范取值,规范中推荐的有效宽度值用于计算组合框架梁的变形和刚度是偏于不安全的。

ANALYSIS ON TEST OF EFFECTIVE FLANGE WIDTH OF COMPOSITE FRAME BEAM

In the analysis and design of steel-concrete composite beams,the concept of effective flange width is introduced to consider the impact of shear lag.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 measured deflection are smaller than those of the codes.Therefore the code-given widths turn to be somewhat unsafe to the calculation of deformation and rigidity of the beam.