Shiraz UniversityIranian Journal of Science and Technology Transactions of Civil Engineering2228-616037220130801NUMERICAL ANALYSIS OF FAULT BEHAVIOR NEAR
UNDERGROUND EXCAVATIONS337343162210.22099/ijstc.2013.1622ENJournal Article20121229In this paper, the behavior of a fault is studied using a constant strain joint model. A<br />combination of slider and spring is used to simulate the shear behavior of faults in the plastic<br />region in contrast to the previous models that have only used an elastic shear spring. Furthermore,<br />the proposed joint element was used to study the behavior of a fault crossing a tunnel regarding the<br />represented shear plastic and dilation behavior of this joint element, and for this purpose a Matlab<br />based program called FEAFB (Finite element analysis of fault behavior) has been developed. The<br />corresponding normal and shear stresses, shear strengths and the factors of safety, for different<br />horizontal to vertical stress ratios and shear stiffness are analyzed and compared to the results of a<br />similar modeling in UDEC program. The analysis indicates that the normal and shear stresses, and<br />the shear strength are increased in the fault elements near the tunnel, and they are decreased in the<br />elements becoming far from the tunnel surface. However, the safety factor can either increase or<br />decrease as it becomes closer to the tunnel surface, depending on the horizontal to vertical stress<br />ratio. Moreover, it is also shown that safety factor depends upon the shear stiffness, i.e., as shear<br />stiffness increases, shear stress increases, and as a result, the safety factor decreases.Shiraz UniversityIranian Journal of Science and Technology Transactions of Civil Engineering2228-616037220130801INELASTIC DAMAGE ANALYSIS OF RCMRFS
USING PUSHOVER METHOD345352162310.22099/ijstc.2013.1623ENJournal Article20110106The main objective of this research is to develop a practical damage criterion based on<br />pushover analysis. For this purpose, damage analysis is performed on several Reinforced Concrete<br />Moment Resisting Frames (RCMRFs). In the static method, performance point of structures is<br />firstly determined using capacity spectrum method and then values of several different damage<br />indices are calculated at these points. By comparing the results of two methods and evaluating<br />correlation between two sets, explicit damage relations are derived based on the static results.