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根据5根钢筋混凝土梁在不同的初始荷载条件下卸载之后的应变、挠度的变化情况,得出卸载过程中截面应变仍符合平截面假定,当初始荷载值未超过极限荷载的40%时,可以按照现行线弹性理论计算滞后应变,但当初始荷载值超过极限荷载的40%时,应考虑塑性变形对滞后应变的不利影响。受拉区混凝土开裂后,非线性程度的高低将直接影响滞后应变的大小,同时应考虑反复加载卸载对滞后应变的不利影响。
According to the change of the strain and deflection after unloading of five reinforced concrete beams under different initial load conditions, it is concluded that the cross-section strain still accords with the plane-section assumption during the unloading process. When the initial load value does not exceed 40% of the ultimate load, The hysteresis strain is calculated according to the current linear elasticity theory. However, when the initial load value exceeds 40% of the ultimate load, the adverse effect of plastic deformation on the hysteresis strain should be considered. After the concrete in the tension zone is cracked, the degree of nonlinearity will directly affect the magnitude of the hysteresis strain, and the adverse effect of repeated loading and unloading on the hysteresis strain should be considered.