收缩徐变对钢-混凝土组合梁弯曲变形的影响分析

为了研究收缩和徐变应变对长期荷载作用下钢-混凝土组合梁弯曲变形以及界面剪力和相对滑移的影响，提出状态空间法求解得到任意截面处界面剪力和界面滑移沿轴向分布的解析解。对比均布荷载作用下简支梁的计算结果与文献中的解析解，验证所提方法的有效性。着重考察了收缩和徐变效应对均布和集中荷载作用下简支梁界面剪力和界面滑移的影响，并研究了剪力连接键滑移刚度的变化对组合梁挠度的影响。结果表明：剪力连接键滑移刚度越大，挠度随收缩徐变累积的相对增加量越大；界面剪力和界面滑移随加载时间逐渐减小。同时给出了合理抗滑移刚度的建议值。图9参18

Effects of shrinkage and creep strains on bending behavior of steel-concrete composite beams

To investigate the effects of shrinkage and creep strains on bending behavior, interfacial shear force and slip of steel-concrete composite beams subjected to long-term loading, the state space method was proposed to derive an analytical solution for the longitudinal distribution of interfacial shear force and slip. The proposed method was validated by comparing the results of a simply supported beam under uniform loading to those available in literature. Numerical examples were performed to illustrate the effects of shrinkage and creep on interfacial shear force and slip of simply supported beams under uniform and concentrated loading, as well as the effects of slip stiffness on the variation of deflection. Research results indicate that it can be concluded that increment in deflection against the accumulation of shrinkage and creep strains increases as the slip stiffness increases, and that the interfacial shear force and slip decrease with loading time. Finally, reasonable slip stiffness is suggested.