Research Of Structure Optimum Design For Mid-Highrise Residential Buildings

The major contents are summarized as follows:1. Various reinforced concrete structural systems of high-rise residential buildings and their characteristics are introduced briefly. Optimal selection of structural system of high-rise residential buildings is a multi-objective synthetic evaluation process, and it is directly related to the reasonableness of structural system, the investment of proprietor and the working convenience of user. By consulting lots of literatures, summarizing working experience and investigating expert, the relationship diagram of main factors that influence structural system of high-rise residential buildings is given and using the fuzzy analytic decision making theory the factor weights and evaluation matrix are obtained. At last,an example is given to illustrate the overall process of optimal selection of structural system of high-rise residential buildings.2. Site conditions and seismic fortification intensity are the key factors affecting the design and construction of mid-highrise residential building. A multi-objective lectotype optimization model based on site conditions and seismic fortification intensity is presented for mid-highrise residential building taking into account multiple items such as the original investment, disaster losses and maintenance cost, the integral stiffness, the total ductility, the construction period, and so on. A Three-Scale Fuzzy Analytical Hierarchy process(T-FAHP)is proposed by introducing the Three-Scale Analytical Hierarchy process(T-AHP) and the trapezoid fuzzy number.The result of a calculation example shows that the T-FAHP is practical and it can select the optimal structural system suitable for the specified site conditions and seismic fortification intensity.3. The relationship between the floor shear of the frame with special-shaped column and the stiffness eigenvalue of frame-shear wall structure is given based on the basis differential equation of the coordination of frame-shear wall structure with special-shaped columns. By introducing the methods of transforming the stiffness of shear wall, the effect of the variation of the bending stiffness of shear wall on internal force of special-shaped columns is analyzed in mid-highrise residential building of RC frame-shear wall structure, and an example shows the variation of internal force of special-shaped columns doesn't need consider in adjusting quantity of shear wall and optimizing the lateral stiffness of shearwall and the cross-section dimensions of special-shaped columns can be assumed as a constant.4. The effects of the shear deformation of shear wall, the axial deformation of special-shaped column and the stiffness of binding beams on the lateral stiffness of R.C. frame-shear wall structure with special-shaped columns are considered, and using the continuous method of interactive frame-shearwall structures, the governing differential equations is established and solved by the upset triangle distribution of horizental earthquake action, the lateral stiffness of shear wall in mid-highrise residential buildings of RC. frame-shearwall structure are optimized. Using the bottom-shear method, the relation between lateral stiffness of shear wall and earthquake action are analysed, and a mathematical model is constructed with interstorey drift, the ratio of lateral stiffness to gravity, storey shear togravity as constrained conditions, and the numerical solution is presented. An example shows the model was feasible and effective.5. The effects of the shear deformation of shear wall, the axial deformation of special-shaped columns and the stiffness of binding beams on the lateral stiffness of RC. frame-shearwall structure with special-shaped columns are considered, the lateral stiffness of shear wall in mid-highrise residential buildings of RC. frame-shearwall structure are optimized based on the principle of continuous-discretized analysis of interactive frame-shearwall structures, and formula for innerforces and displacements of elements are developed by div...