Parameter analysis of mechanical performance of reinforced concrete chimney openings
In order to explore the most important parameters that affect the stress concentration phenomenon at the opening and the design method for the reinforcement of the opening,a scaled model test was carried out firstly,and the stress state around the opening was analyzed.By comparing with the numerical simulation results,the accuracy of the analysis method was verified.Subsequently,49 numerical analysis models with different parameters were established and static elastic-plastic analysis was conducted.The effects of chimney wall thickness,wall diameter,opening size,and opening spacing on the stress state around the opening were studied separately.The main parameters that affect the stress concentration phenomenon at the opening were determined,and suggestions for the opening limit value were given.A design method for dense reinforcement were proposed.The results show that when the chimney has only one opening,the center angle of the cross-section of the opening should be less than 70°.When there are multiple openings,the whole central angle of all openings should be less than 140°,and the spacing between the openings should not be less than 0.5 times the lateral width of the opening.The range of reinforcement area for circular openings should be 4.5 times the wall thickness,for rectangular openings should be 3.5 times the wall thickness,and for additional reinforcement bars,1.3 times the reinforcement ratio for non reinforcement areas should be taken.The dynamic response analysis under earthquake action has verified that the proposed reinforcement method for the opening can effectively reduce the degree of stress concentration around the opening and improve the mechanical performance of the section where the opening is located.
reinforced concrete chimneyparameter analysisstress concentrationscaled model
NETL
NSTL
万方数据
维普
