چكيده به لاتين
Abstract
Non-linear structure reduction is mostly designed based on rigid foundation in which period, flexibility, and soil type play significant role in forming structure reduction. In this research study, the influence of various types of soil is measured in site system and soil interaction effect is not considered. During intensive motions, regulations permit the structure to take non-linear shapes. In other words, obtained linear design forces decrease due to reduction factor. In this research, structures with dual system including moment frame and shear wall placed in soil type II and III are modeled in tridimensional form by Etabs 9.7.4 according to 2800 standards, forth edition. Then, the frame including shear wall and its carrying burden are taken out and analyzed by using pushover in interactional and fixed-based conditions in Etabs 9.7.4. Afterward, structure reduction factor in adherence to parameters of 2800 regulations is calculated by Yovang method. In order to show the accuracy of two-dimensional structure reduction factor, it is compared with reduction factor of tridimensional fixed-based and interactional structure. The result shows that reduction factor measured by considering influence of soil-structure interactions decreases in relation to fixed base. The decreased amount is function of parameter disregarding dimension of a_0 and structure height. Furthermore, the movement of yield point in interactional structure occurs with delay in proportion to fixed base, in the other words, the amount of movement and structure drifts increases in interactional condition.
Keywords: Reduction factor, Soil- structure interaction, Dual system including moment frame and shear wall, Pushover analysis, Uang procedure
