Study on Load-Carrying Capacity and Dynamic Effect of RC Beam and Slab under Variable Load

本研究采用能够承受假定大型车辆波动荷载的运行振动荷载试验装置，对钢筋混凝土梁、板试件进行静载试验(2)运行荷载试验(3)恒定运行荷载试验和(4)运行振动荷载试验，确定各试验中振动的承载能力、破坏机理和影响。研究结果为改进钢筋混凝土构件的设计方法提供了新的知识。(1)混凝土材料抗剪强度研究抗剪强度方面，分别进行了常规的(1)单面剪切试验和(2)II型单面剪切试验。从抗压强度与II型单抗剪强度的关系出发，推导出普通到高强度范围内的抗剪强度特征值。(2)钢筋混凝土梁板承载能力研究采用单筋矩形截面钢筋混凝土板和多筋矩形截面钢筋混凝土板进行静载试验(2)运行荷载试验(3)恒定运行荷载试验和(4)运行振动荷载试验，验证运行荷载对钢筋混凝土梁静弯承载能力的影响。研究了极限状态设计方法中静态抗弯承载力与极限抗弯承载力的符合性，并对运行荷载下构件修正系数的处理进行了评价。此外，还对钢筋混凝土板的冲剪承载力和破坏机理进行了研究，并从试验中评价了混凝土构件动力特性对冲剪承载力的影响，以评价试验承载力与理论承载力的一致性以及钢筋混凝土板在运行荷载作用下的冲剪承载力。(3)荷载波动对钢筋混凝土梁板的动力影响研究进行了sindoor试验，确定了荷载波动对钢结构公路桥梁钢筋混凝土板的动力影响。这些试验以钢筋混凝土梁和板为试样。通过施加运行振动载荷时挠曲产生的动态放大系数推导出试验冲击系数，并对其进行动态影响系数评估。并提出了利用该动力影响系数计算公路桥梁钢筋混凝土板设计弯矩的公式。少

In this study, a running vibration load test unit capable of applying the fluctuating loads supposed large vehicles was used to conduct (1)static load tests (2)running load tests (3)constant running load tests and (4)running vibration load tests on reinforced concrete beam and slab test specimens, in order to determine the load-carrying capacity, failure mechanism and effect of vibrations in each test. The results provided new knowledge for use in improving the methods used to design reinforced concrete members.(1) Study of shear strength concrete materialsWith regard to shear strength, conventional (1)one-plane shear test and (2)Mode II type one-plane shear test were conducted. From the relationship between compressive strength and Mode II single shear strength, shear strength characteristic value for ordinary to high strength ranges was formulated.(2)Study of load-carrying capacity of reinforced concrete beams and slabsA single-reinforcement oblong section reinforced concrete slab an … More d a multiple-reinforcement oblong section reinforced concrete slab were used to perform (1)static load tests (2)running load tests (3)constant running load tests and (4)running vibration load tests to verify the effect of running loads on the static flexural load-carrying capacity of reinforced concrete beams. A study was also conducted to determine the conformity of static flexural load-carrying capacity with ultimate flexural load-carrying capacity in limit state design methods, and the handling of member correction factors with respect to running loads was also evaluated. In addition, studies were also conducted for the punching shear load-carrying capacity and failure mechanism of reinforced concrete slabs, and the effect of the dynamic characteristics of concrete members on punching shear load-carrying capacity was evaluated from tests, in order to evaluate the conformity of test load-carrying capacity with theoretical load-carrying capacity and the punching shear load-carrying capacity of reinforced concrete slabs subjected to running loads.(3)Study of dynamical influence of load fluctuations on reinforced concrete beams and slabsIndoor tests were conducted to determine the dynamical influence of load fluctuations on the reinforced concrete slabs of steel highway bridges. Reinforced concrete beams and slabs were used as test specimens for these tests. The test impact coefficient was derived from the dynamic amplification factor resulting from flexure when running vibration load was applied, and the dynamical influence coefficient was evaluated. An equation utilizing this dynamical influence coefficient for use in calculating the design bending moment for the reinforced concrete slabs in highway bridges was also proposed. Less