Through the experiments of two groups of 1/3 scale models subjected to long - term serviceload, the variation of long - term stress of prestressed concrete frame shallow - beam floor withunbonded tendons and nonprestressed steel has been investigated. The test results show thatcreep and shrinkage in concrete cause the redistribution of stress between shallow beam and waffleslab, while the nonprestressed steel affects the degree of redistribution, the higher the amount ofnonprestressed steel, the lower the d...
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