A multi-objective lectotype optimization model based on site conditions and seismic fortification intensity is presented for mid-highrise residential buildings taking into account multiple items such as the original i...A multi-objective lectotype optimization model based on site conditions and seismic fortification intensity is presented for mid-highrise residential buildings 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 is proposed by introducing the Three-Scale Analytical Hierarchy process and the trapezoid fuzzy number. The result of a calculation example shows that the T-FAHP is practical.展开更多
In view of the folding plate flocculation sedimentation tank in the water treatment plant, the relevant requirements of the standard of the calculation of the internal force of the surface water-holding structure unde...In view of the folding plate flocculation sedimentation tank in the water treatment plant, the relevant requirements of the standard of the calculation of the internal force of the surface water-holding structure under the earthquake are discussed, and the influence of different seismic intensity on the internal force of the surface reinforced concrete rectangular pool is studied. The outer wall and middle guide wall of settling pond advection region were studied. The different load conditions that should be considered are summarized. For the calculation of gravity inertia force, according to the characteristic of vertical distribution of gravity inertia force, using the idea of calculus, the calculation method of piecewise solution and sum is put forward. According to different working conditions, the influence of seismic action on the internal forces of the pool wall and the middle partition wall is studied, and the simple and practical computation sheet is summarized. The results show that the seismic effect cannot be ignored in the design of rectangular pool structure. The internal force of the pool increases with the increase of seismic fortification intensity. For guide walls subjected to hydrostatic pressure on both sides, although the pool body is not affected by horizontal force under hydrostatic pressure, the bending moment at the base of the guide wall should not be ignored and should be calculated according to the flexural members with considering earthquake action.展开更多
According to the Code for Seismic Design of Buildings （GB50011-2001）, ten typical reinforced concrete （RC） frame structures, used as school classroom buildings, are designed with different seismic fortification in...According to the Code for Seismic Design of Buildings （GB50011-2001）, ten typical reinforced concrete （RC） frame structures, used as school classroom buildings, are designed with different seismic fortification intensities （SFIs） （SFI=6 to 8.5） and different seismic design categories （SDCs） （SDC=B and C）. The collapse resistance of the frames with SDC=B and C in terms of collapse fragility curves are quantitatively evaluated and compared via incremental dynamic analysis （IDA）. The results show that the collapse resistance of structures should be evaluated based on both the absolute seismic resistance and the corresponding design seismic intensity. For the frames with SFI from 6 to 7.5, because they have relatively low absolute seismic resistance, their collapse resistance is insufficient even when their corresponding SDCs are upgraded from B to C. Thus, further measures are needed to enhance these structures, and some suggestions are proposed.展开更多
文摘A multi-objective lectotype optimization model based on site conditions and seismic fortification intensity is presented for mid-highrise residential buildings 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 is proposed by introducing the Three-Scale Analytical Hierarchy process and the trapezoid fuzzy number. The result of a calculation example shows that the T-FAHP is practical.
文摘In view of the folding plate flocculation sedimentation tank in the water treatment plant, the relevant requirements of the standard of the calculation of the internal force of the surface water-holding structure under the earthquake are discussed, and the influence of different seismic intensity on the internal force of the surface reinforced concrete rectangular pool is studied. The outer wall and middle guide wall of settling pond advection region were studied. The different load conditions that should be considered are summarized. For the calculation of gravity inertia force, according to the characteristic of vertical distribution of gravity inertia force, using the idea of calculus, the calculation method of piecewise solution and sum is put forward. According to different working conditions, the influence of seismic action on the internal forces of the pool wall and the middle partition wall is studied, and the simple and practical computation sheet is summarized. The results show that the seismic effect cannot be ignored in the design of rectangular pool structure. The internal force of the pool increases with the increase of seismic fortification intensity. For guide walls subjected to hydrostatic pressure on both sides, although the pool body is not affected by horizontal force under hydrostatic pressure, the bending moment at the base of the guide wall should not be ignored and should be calculated according to the flexural members with considering earthquake action.
基金National Science Foundation of China Under Grant No.90815025&51178249the National Key Technologies R&D Program Under Grant No.2009BAJ28B01&2006BAJ03A02-01+1 种基金Tsinghua University Research Funds No.2010THZ02-1the Program for New Century Excellent Talents in University
文摘According to the Code for Seismic Design of Buildings （GB50011-2001）, ten typical reinforced concrete （RC） frame structures, used as school classroom buildings, are designed with different seismic fortification intensities （SFIs） （SFI=6 to 8.5） and different seismic design categories （SDCs） （SDC=B and C）. The collapse resistance of the frames with SDC=B and C in terms of collapse fragility curves are quantitatively evaluated and compared via incremental dynamic analysis （IDA）. The results show that the collapse resistance of structures should be evaluated based on both the absolute seismic resistance and the corresponding design seismic intensity. For the frames with SFI from 6 to 7.5, because they have relatively low absolute seismic resistance, their collapse resistance is insufficient even when their corresponding SDCs are upgraded from B to C. Thus, further measures are needed to enhance these structures, and some suggestions are proposed.
