方钢管混凝土中钢管的套箍作用及其壁板之间的焊缝

Confining Effect of Square Tube to Filled Concrete and Welds Between Walls

介绍了方钢管混凝土轴压杆受力过程中的围压分布和壁板弯矩及其极限状态的塑性铰线,计算了平均围压,按照圆钢管混凝土极限状态产生相同围压的要求围压计算了对应的径厚比,得到了方钢管的套箍效应等效系数,并将其与试验结果进行对比,提出的公式能够反映试验结果的平均值。同时对壁板之间何时必须采用全熔透焊缝也给出了说明。

The distribution of confining stresses and bending moments along 4 side-plates in concrete filled tube as a compression member are introduced.The plastic hinge lines formed in side-plates in the ultimate states are assumed and the average confining pressure is computed.By requiring the same confining pressure is achieved in concrete filled circular pipe in its ultimate state,the corresponding radius-thickness ratio of the pipe is determined and equivalent confining coefficient is obtained.The equivalent coefficient is presented and compared to the test result,and is found to be able to predict the average strength of the test results.Finally when the full strength weld between side-plates is required is provided.