Analytical calculation method for creep and shrinkage effect of reinforced concrete continuous slabs
In the reinforced concrete beam-slab structure,the creep and shrinkage of the concrete slab will cause the load increment on secondary beams,resulting in the change of the load on secondary beams.The key to calculate the load increment between beams is to solve the creep and shrinkage redistribution reaction force of continuous slabs.Therefore,an analytical method for analyzing the time-varying law of internal force and support reaction force of reinforced concrete continuous slabs is proposed in this paper,the analytical formulas of secondary internal force and secondary reaction force of reinforced concrete continuous one-way slabs under the influence of creep and shrinkage are derived respectively.According to the formulas,a MATLAB calculation program is compiled,and an example of a reinforced concrete continuous one-way slabs is analyzed by using this program.The results show that concrete creep has no contribution to the change of inter-beam load,while concrete shrinkage will cause additional inter-beam load on the secondary beam at the bottom of the slab,which is equal to the secondary reaction force and related to the reinforcement ratio of the slab.The creep and shrinkage secondary internal force of the continuous slabs can be calculated expediently,and the load increment on beams caused by shrinkage in the slab-beam structure can be estimated by using this method.The formula derivation is based on clear mechanics,which is an effective supplement to the calculation of long-term mechanical effects of continuous slab-beam structure.
reinforced concrete beam-slab structurecontinuous one-way slabsshrinkage and creepsecondary reaction forceload increment on beams
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