RPC叠合简支梁受弯承载力分析

Analysis of bending capacity of RPC composite simply supported beams

通过RPC叠合简支梁受弯试验,研究不同预制高度对试验梁正截面承载力的影响。结果表明:叠合面上下混凝土的应变符合后浇混凝土受压"应变滞后"现象;平截面假定对于RPC叠合梁同样适用;随着预制高度的减小,试件带裂缝受弯工作能力有所降低。考虑不同预制高度对受弯承载力的影响,推导了RPC叠合梁正截面受弯承载力的建议式;考察了活性粉末混凝土叠合梁的界限受压区高度和最大配筋率。

Through bending test of RPC composite simply-supported beams, the influence of precast height on the bearing capacity of normal section of test beam was studied.The result shows that the strains of the concrete on the laminated surface and the concrete under the laminated surface conform to the phenomenon of "strain lag" of the post-poured concrete under compression.The flat section assumption is also applicable to RPC composite beams.With the decrease of the precast height, the crack bending capacity of the specimen decreases.From the influence of different precast heights on the flexural bearing capacity, a suggested formula for the flexural bearing capacity of the normal section of RPC composite beam was derived.The height of the limit compression zone and the maximum reinforcement ratio of the composite beams of reactive powder concrete were investigated.