不同偏心距下内外刚性法兰压弯承载力性能试验研究

EXPERIMENTAL STUDY OF THE BEARING CAPACITY OF INTERNAL-EXTERNAL FLANGE JOINTS SUBJECTED TO PRESSURE AND BENDING LOADINGS WITH VARIOUS ECCENTRICITIES

通过改变偏心距,对内外刚性法兰在压弯组合荷载下的承载力性能进行了试验研究。利用有限元方法对其力学特性进行了数值仿真分析,并与试验结果进行比较验证,确定力学模型。根据此模型及平截面假定,进行了内外法兰承载力的理论分析。将规范方法应用于内外法兰得到的结果与试验、数值仿真及理论分析结果一致,规范方法得到的螺栓拉力对应于螺栓屈服状态。理论分析和试验表明,极限状态时法兰大偏心受压会出现法兰破坏,而小偏心下为钢管破坏。

Experimental study was conducted to achieve the bearing capacity of the flange by using eccentric compression method with various eccentricities. Finite element method was utilized for numerical simulations,and the results were compared with that obtained by experiment for validation. The corresponding mechanical model for the flange undergoing eccentric compression was attained. In accordance with it and plane-section assumption,the theoretical study was conducted. The results showed that the results obtained via the computing method specified in codes was consistent with the findings from experiment,numerical simulation and theoretical analysis respectively. The maximum tension force of the threaded bolt computed by the equations in the code corresponds to the status of yield. Both experimental and theoretical studies indicated that a flange failure was shown if the eccentricity was sufficiently large,and the tube failure occurred while the eccentricity was relatively small.