Optimized Design For Retaining Wall Of Sidewall For Large-volume Concrete Sewage-treating Tank

In the design of tanks, the relative stiffness of the rotary pilasters andoperating stages (or the walking boards) can make the support conditions of thetank top change, which is beneficial to the stress condition of the optimizedstructures and reducing the cracks on the top. It overcomes the shortcomings suchas the relative stiffness of the top of the retaining wall is small，which causes theretaining wall whose the support condition of the top is articulated or free endcannot meet the requirement of long-time load stress. It improves thecomprehensive stability of the structure and makes it with excellent performance offlexibility.This article with the combination of the analysis on one part of the retaining wallcalculates the relative stiffness and simulates the stress features, and consideringthe combined influence of bending and torsion, it undertakes the analysis asfollowing:(1) It uses the software to simulate the result of the displacement change cloudpicture and the stress change cloud picture based on the measurement changes atthe rotary pilasters of the retaining wall. According to the space variable angletruss model, under the circumstances of the size changing at the rotary pilasters andunder the combined function of the moment and the bending and torsion, itconcludes the changing curves of the proportion of the stiffness for the joint of theretaining wall and the rotary pilasters, and the top of the retaining wall.(2) Combined with the formula of the stiffness ratio, it judges the supportcondition at the top of the retaining wall, determines the interval, and establishesthe formula of the stiffness limitation at the rotary pilasters. Living up to theconditions, the top of the retaining wall is the optimized elastic support. In thisinterval of the rotary pilasters, as the size grows, the stiffness accordingly increasesand the stability of the structure also increases.(3) With the increase of the size at the rotary pilasters, the ratio of the largestdisplacement of the structure and the displacement at the joint of the rotarypilasters is decreasing. The support condition accordingly changes, but thecorresponding stress change is not so even distributed. Based on the concludedformula it concludes the changing formula of the bending and torsion ratio of thewalking board at the top. The article concludes the relative stiffness formula of the rotary pilasters and thecantilevered plate, and the limitation formula for optimizing the size, which areboth beneficial to adjusting the support condition at the top of the retaining walland provide theoretical foundation and calculation evidence for the application inprojects.