预应力钢骨混凝土梁动力性能参数

为促进预应力钢骨混凝土梁这一新型结构型式在地震区的推广应用,对7根跨度为3800mm、2根跨度为4500mm的预应力钢骨混凝土简支梁的骨架曲线进行了仿真分析,仿真分析结果与试验结果吻合较好.利用仿真分析方法,探索了截面型钢抗力与截面总抗力之比(α)与截面预应力筋抗力与截面总抗力之比(r)两个参数对截面单调弯矩-曲率曲线和构件单调荷载-位移曲线的影响,统计回归了预应力钢骨混凝土梁曲率延性和位移延性的计算公式.最后建立了与试验结果吻合较好的预应力钢骨混凝土梁荷载-位移恢复力模型和弯矩-曲率恢复力模型.

Study on parameters of dynamic performance of prestressed steel reinforced concrete beams

In order to promote the application of prestressed steel-reinforced concrete in the seismic area,simulation analysis is performed on 7 prestressed steel-reinforced simply-supported concrete beams with span of 3800 mm and 2 such beams with span of 4500 mm. The simulated results agree well with the test results. By using the method of simulation analysis,the influences of two factors on the moment-curvature curve of section and the load-displacement curve of members are researched,which are the ratio of the resistance of shaped steel to the total resistance and the ratio of the resistance of prestressed steel to the total resistance of section. Formulas for calculating the curvature ductility and the displacement ductility are given by the statistical study. And the hysteretic models for the load-displacement and the moment-curvature of prestressed steel-reinforced concrete beams are proposed,which agree well with test results.