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基于经典屈服线理论的机动法,建立虚功方程时考虑了大变形下混凝土板塑性铰线截面处的钢筋伸长做功,提出了计算大变形下混凝土单向板在均布荷载作用下极限承载力的改进机动法.为验证本方法的合理性,开展了3种边界条件的6块钢筋混凝土单向板在大变形下的静载试验,并将试验结果与计算结果进行了对比.结果表明:在大变形下混凝土单向板的破坏模式与经典屈服线理论的塑性铰线模式一致;由于受拉薄膜效应的存在,单向板挠度达到跨度的1/15时,仍能承受较大荷载;本方法计算的板极限承载力与试验结果相差不超过10%,具有较好的精度.
Based on the maneuvering method of classical yield line theory, the work of reinforcement elongation at plastic hinge line under large deformation is considered in the establishment of virtual work equation. The calculation of the ultimate load of the unidirectional concrete slab under uniform load under large deformation In order to verify the rationality of the method, static load tests of six reinforced concrete unidirectional plates with three kinds of boundary conditions under large deformation are carried out, and the test results are compared with the calculated results. : The failure mode of the unidirectional concrete slab under large deformation is consistent with the plastic hinge mode of the classical yield line theory. Due to the effect of tensioned thin film, the deflexion of the unidirectional slab can still withstand the larger load The difference between the ultimate bearing capacity calculated by this method and the test result is no more than 10%, with better accuracy.