STUDY ON DYNAMIC HYSTERESIS OF REINFORCED CONCRETE AND STEEL MEMBERS SUBJECTED TO COMBINED STRESSES AND NONLINEAR DYNAMIC ANALYSIS

2002年至2004年，我们进行了试验研究，以阐明钢筋混凝土构件在轴力、弯矩和扭转作用下的迟滞性。实验参数为初始轴向力、环侧系节距、弯曲载荷和扭转载荷的比值。通过对20个模型的实验结果，得出以下新结论：在恢复特性方面，1)环箍侧扎节距对扭转迟滞回线的影响显著，对弯曲迟滞回线的影响较小。2)在扭转载荷超越型中，较差的HLT模型（ctc=60mm）也通过弯曲进行能量吸收，而足够的HLT模型（ctc=30mm）不通过弯曲进行能量吸收。3)在HLT足够的情况下，组合加载方式的吸能量最大，而在HLT较差的情况下，最大吸能构件随超过荷载的不同而变化。关于弯扭相互作用曲线，1)随着初始轴向力的增大，相互作用曲线变大。节距对裂纹和屈服相互作用曲线的影响不大，但对极限强度相互作用曲线的影响显著，特别是在扭转超越区。2)对于归一化的相互作用关系，提出了安全侧相互作用曲线。杆件最大强度的相互作用曲线取决于杆段的节距。3)扭转超越区和弯曲超越区边界取决于杆段的节距。因此，进一步的研究以澄清边界是必要的。

During 2002 to 2004, we conducted the experimental research to clarify the hysteresis of reinforced concrete members subjected to axial forces, bending and torsional moments. Experimental parameters are initial axial forces, pitch of hoop lateral ties, and ratios of bending loads and torsional loads. The following new conclusion is obtained by experimental results for 20 models.About restoring characteristics,1)The pitch of hoop lateral tie(HLT) remarkably affect for hysteresis loop for torsion, but not for bending.2)In torsional load surpass type, energy absorption is also carried out by bending for poor HLT models (ctc=60mm), but is not carried out by bending for sufficient HLT models (ctc=30mm).3)In case of sufficient HLT, amount of energy absorption for combined loading type is largest, but in case of poor HLT largest energy absorption member vary in accordance with surpass loading.About interaction curves of bending and torsion,1)Interaction curves become larger according to the increasing of the initial axial forces. The effect of pitch of HLT is few for crack and yield interaction curves, but it remarkably affect for ultimate strength interaction curves especially in torsion surpass region.2)For normalized interaction relations, safety side interaction curves are proposed. Interaction curves for maximum strength of the member depend on the pitch of HLT.3)The boundary of torsion surpass region and bending surpass region depend on the pitch of HLT. Therefore the further investigation to clarify the boundary is necessary.