配矩形螺旋箍筋型钢高强混凝土柱拟静力试验及有限元分析

QUASI-STATIC TEST AND FINITE ELEMENT ANALYSIS OF STEEL REINFORCED HIGH-STRENGTH CONCRETE COLUMNS WITH RECTANGULAR SPIRAL STIRRUPS

通过配矩形螺旋箍筋型钢高强混凝土柱的拟静力试验发现:构件随着剪跨比的增大依次主要发生剪切斜压破坏、剪切黏结破坏和弯曲破坏,采用螺旋箍筋构件相比普通箍筋构件的滞回曲线饱满,耗能能力及延性提高。采用ABAQUS软件进行有限元分析,计算结果与试验结果吻合较好,在此基础上,以剪跨比、轴压比、型钢含钢率和型钢屈服强度为参数进行分析。研究结果表明:构件的承载力和初始刚度随剪跨比的增加而降低,延性提高;提高轴压比对构件承载力的影响是先增加后降低,而延性始终呈下降的趋势;提高型钢的含钢率和屈服强度,能够提高构件的承载力和延性。

Based on quasi-static test of steel reinforced high-performance concrete （SRHC） columns with rectangular spiral stirrups, shear-diagonal compression failure, shear-bond failure and flexural failure occurred in according to the value of shear span ratio. Comparing with the SRHC column confined by ordinary stirrups, the one confined by spiral stirrups had more plump hysteretic loops. Nonlinear finite element model was built to analyze this column using ABAQUS, the finite element analysis results agreed well with test results. The influences of shear span ratio, axial compression ratio, steel yield strength and steel ratio on the behaviour of the columns were simulated. Results showed that the bearing capacity and elastic stiffness decreased obviously with the increment of shear span ratio, but the ductility was improved. When axial compression ratio exceeded a certain value, the bearing capacity did not increase but decreased, while the ductility always declined. The bearing capacity and ductility were improved with the increments of steel yield strength and steel ratio.