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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。
In order to study the influence of shrinkage and creep strain on the bending deformation and interfacial shear force and relative slip of steel-concrete composite beam under long-term load, the state space method is proposed to obtain the interfacial shear force and interfacial slip along the axial distribution Analytical solution. Comparing the calculated results of simply supported beams under uniform load with the analytical solutions in the literature, the validity of the proposed method is verified. The effects of shrinkage and creep on the interfacial shear and interface slippage of simply supported beams under uniform and concentrated loads are investigated emphatically. The effects of the variation of the sliding stiffness on the deflection of the composite beams are also studied. The results show that the greater the sliding stiffness of the shear bond, the larger the relative increase of deflection with the cumulative shrinkage and creep. The interfacial shear and interface slip gradually decrease with the loading time. At the same time, a reasonable value of anti-slip stiffness is given.