| Construction control of steel-concrete heterogeneous material composite structures aims at ensuring all segments under construction to approach corresponding construction segmental reasonable states in both configuration and mechanics state "and good behavior of the structure after completion, escaping from all kinds of accidents in whole process of construction with high efficiency, safety, excellent quality of engineering achieved. Based on analysis of coordinating relation between steel and concrete, this paper focuses on study of prediction control theory of structure construction and development of software system.First, to solve the present difficulties in steel-concrete engineering structural analysis and construction supervision and control, steel-concrete coordinating relations for two kinds of heterogeneous material composite members, prestressing cables and concrete, steel tubes and concrete, are studied and deduced by proposing the concepts of both composite members of heterogeneous materials and steel-concrete coordinating relations. Based on the steel-concrete coordinating relations, element stiffness matrix of geometrically nonlinear analysis, formulas for self-stresses by temperatures and displacements, stresses of corresponding superfluous structures are further studied. Furthermore, a new theory and method for structural geometrical nonlinearity and buckling analysis is put forward. Practical engineering examples demonstrate that it is of good element characteristics, high efficiency, as well as capable of considering time-dependent behaviors of concrete. Additionally, it deserves to mention that the theory and method above solves effectively the problems of affection to each other, such as affection of steel bundles to concrete creep, which is automatically counted in by the relationship. Especially, to prestressed concrete structures by segmental construction, it has ever not been solved effectively to estimate prestress damage of previous cables caused by following prestressing cables. However, it is readily solved by the relationship, which simulates practical structural behavior, enhances foresight to all kinds of accidents and ensures structuralsafety in strength and stability.Secondly, design (construction) completion reasonable states and design (construction) segmental reasonable states are proposed. Based on them, parameter approach analysis method of design segmental reasonable state is introduced, which has only iteration in due direction, and more efficient than present backward analysis, backward-forward iteration analysis and non-stress state method as well as more stable because of introduction of iteration parameter.A improved grey prediction model NGM(1,1) is proposed by systematic study of grey prediction. A normalized mapping rule of raw grey series is introduced by analysis of exponential function characteristics of the whitening differential equation, which makes the non-equigap grey prediction model NGM(1,1) fit for universal raw grey series, improves prediction precision greatly, meanwhile makes innovation to series with negative values and enlarges grey prediction theory. Besides, forward rolling optimization thinking is proposed and carried out based on the developed random perturbation method of genetic algorithms. All above form the characteristics of prediction control theory in this paper.Lastly, based on the theories and methods involved, BRC, a powerful software system of construction control of bridges with autonomous property right is developed, which starting point is high and fit for all forms of bridges because of generalized hybrid-material elements and cable elements. Furthermore, in control part, it owns analysis functions of design (construction) completion reasonable states and design (construction) segmental reasonable states, elevation of form erection or installation, simulation analysis, foresight of alarm and generalized optimization, among which, design of foresight of alarm will break through the difficulty of non-synchronism of...
|
PDF Full Text Request