- مبلغ: ۸۶,۰۰۰ تومان
- مبلغ: ۹۱,۰۰۰ تومان
In coupled shear wall systems, the excessive shear forces are induced in the coupling beams. As a result, in such systems, the coupling beam and the joint of wall-coupling may yield first. The critical concern about the coupling beam is ductility demand. In order to have such ductility, the coupling beams are required to be properly detailed with significantly complicated reinforcement arrangement and insignificant strength degradation during ground motion. To solve these problems and to increase energy dissipating capacities, this study presents an investigation of the seismic behavior of coupled shear wall-frame system, in which energy dissipation devices are located at the middle portion of the linked beam. The proposed method, which is based on the energy equilibrium method, offers an important design method by the result of increasing energy dissipation capacity and reducing damage to the structure. The design procedure was prescribed and discussed in details. Nonlinear dynamic analysis indicates that, with a proper set of damping parameters, the wall’s dynamic responses can be well controlled. Thereafter, an optimized formula is proposed to calculate the distribution of the yield shear force coefficients of energy dissipation devices. Thereby, distributing equal damages through different heights of a building as well as considering the permissible damage at the wall’s base. Finally, numerical examples demonstrate the applicability of the proposed methods.
This paper presents a new philosophy for the design of coupled shear wall buildings where dissipation devices are located in the middle portion of linked beams to introduce a high level of dependable energy dissipation devices for the primary purpose of reducing earthquake effects. On the basis of the results shown in the previous sections, the following conclusion can be drawn:
(1) Numerical simulation of the different damping wall systems subjected to earthquake is carried out to verify the damping effect of the new structure system. It is also discussed how damper parameters influence the damping wall on the seismic performance, and the discussion presents that only when the parameters are chosen in a certain range would the ideal damping effect be acquired.
(2) The main factors for reduction of the response of the structure are parameters associated with dampers and the dissipation of energy produced during earthquake by the mean of dampers.
(3) The performance of building structures in seismic loading is improved to a great extent. By the provision of optimum designed dampers, maximum drift is reduced by 16, 33 and 59% for 10, 15 and 20 story buildings respectively.
(4) The design procedure adopted for proportioning the coupled shear wall-frame having damper in the middle portion of the coupling beam in shear wall prove to be effective and reliable for controlling the seismic damage of the shear wall.
(5) By using the suitable yield deformation ratio, an appropriate value for the characteristics of dampers can be selected such that the less the damage level of wall and damper is achieved. In order to achieve the accepted damage level at the walls, the flexural and shear strengths of walls need to be changed according to the value of permissible damage.(6) The results clearly demonstrated that by designing the optimum damper device with the strength reduction factor of and amplification factor of wall piers, greater degree of reliability in the earthquake-resistant design or upgrading of buildings can be achieved.
(7) The damage distribution of dissipation devices applied with the proposed calculation formula of optimum distribution of yield shear force coefficients of dampers showed a relatively uniform distribution through the height of the building.