Optimization Of High Falsework Considering The Effect Of Human Error

With the rapid development of China’s construction industry, the application of high falsework systems become more and more common, meanwhile the falsework collapse accidents are increasingly frequent. Considering the economy and reliability of the falsework, optimizing the structure design method, exploring a win-win structural form, are worthy of study. The main contents and conclusions of this paper are as follows:(1) The research objects are the most four common frames in construction form. Based on the analysis of the numerical simulation results, a simplified calculation unit of a three-dimensional falsework ultimate bearing capacity is proposed.The formula about the relation of simplified calculation unit and the whole model ultimate bearing capacity is presented.(2) Based on MATLAB genetic algorithm GATBX toolbox, with4story4bay simplified calculation unit as the research object, with the section dimensions of horizontal tube, upright tube and diagonal bracing tube as optimization variables, with the minimum amount of steel as the optimization objective, to achieve the original ultimate bearing capacity as the constraint condition, using the form of penalty function to give the fitness function, and through the enumeration method to find out the optimal penalty coefficient and mutation probability values, using genetic algorithm to optimize the analyze, the optimal solution can save the steel amount33.6%; according to the optimization results,the selection scheme of actual size of pipe section is given.(3) The upright tube forced eccentricity is a common phenomenon, and has the greater impact on the bearing capacity. In this paper, upright tube’s forced eccentricity is measured, and the statistical property is given.(4) Based on ANSYS probability analysis module, in the two cases which one has the human error and another has no, the reliability analysis of the falsework by the specific size steel and the optimal design is carried out. It is found that in the absence of human error conditions both designs satisfy the reliability requirements, and has large surplus, however, in human error conditions are not met,and differ more.It shows that the effect of human error on the falsework is quite serious and can not be ignored.(5) Taking "not set the horizontal diagonal bracing","upright tube’s initial bending beyond regulations","upright tube beyond the top horizontal tube too much" and "upright tube forced eccentricity" four human errors occur at the same time using4story4bay simplified calculation unit as the research object,the section dimensions of horizontal tube, upright tube and diagonal bracing tube as optimization variables, the minimum amount of steel as the optimization objective, the fitting the specification of the reliability index as constraint condition, using genetic algorithm to optimize the analyze, the optimal solution can save the steel amount21.3%; according to the optimization results, the selection scheme of actual size of pipe section is given.