Experienced Associate Professor with a demonstrated history of working in the civil engineering industry. Skilled in AutoCAD, Steel Structures, Structural Engineering, SAP2000, and Construction. Strong engineering professional with a Doctor of Philosophy (Ph.D.) focused in Earthquake Engineering from University of Architecture, Civil Engineering and Geodesy.
Annual of the University of Architecture, Civil Engineering and Geodesy, Sofia, Volume 52, Issue 3, 2019
Jerk is the rate of change of acceleration. It is a vector quantity and its scalar magnitude is a... more Jerk is the rate of change of acceleration. It is a vector quantity and its scalar magnitude is also the third derivative of position of a body or joint of a structure. Its dimension is [length/time 3 ]. This paper proposes formulas and presents graphs for jerk response spectrum for a given earthquake ground motion with different damping ratios. A few variants of combined response spectrum graph are shown. All graphs include the jerk response spectrum. The fractional derivative theory was used to improve the combined spectrum representation. A parameter (named miamisi) for assessing the size of the earthquake impact, incorporating the displacement and acceleration, is suggested.
Procedures for computing the response of structures during an earthquake (or another dynamic grou... more Procedures for computing the response of structures during an earthquake (or another dynamic ground motion) involves a calculation of the modal participation factor, which formula includes influence vector {r}. The definition of the influence vector is often given as a "displacement transformation vector that expresses the displacement of each structure degree of freedom due to static application of a unit support displacement" or something similar. That kind of definitions produces correct results only in regular structures depending on the directions of the DOFs and the ground excitation. But in many cases the usage the definitions mentioned above leads to wrong results, even sometimes to zero solutions. In this paper another method to calculate the modal participation factor is proposed based on the usage of the load distribution vector {R} and it is correct in all cases. A correct formula for the influence vector as a function of load distribution vector is also proposed.
1. Abstract In this paper the authors make attempt to see from inside the state and problems of a... more 1. Abstract In this paper the authors make attempt to see from inside the state and problems of a part of the very rich architectural and historical heritage of Bulgaria (1, 2, 3). A short review and description of the structures of some typical representatives of historical monuments: fortresses, monasteries, basilicas, churches, cathedrals and bridges are given. The period from
Annual of the University of Architecture, Civil Engineering and Geodesy, Sofia, Volume 52, Issue 3, 2019
Jerk is the rate of change of acceleration. It is a vector quantity and its scalar magnitude is a... more Jerk is the rate of change of acceleration. It is a vector quantity and its scalar magnitude is also the third derivative of position of a body or joint of a structure. Its dimension is [length/time 3 ]. This paper proposes formulas and presents graphs for jerk response spectrum for a given earthquake ground motion with different damping ratios. A few variants of combined response spectrum graph are shown. All graphs include the jerk response spectrum. The fractional derivative theory was used to improve the combined spectrum representation. A parameter (named miamisi) for assessing the size of the earthquake impact, incorporating the displacement and acceleration, is suggested.
Procedures for computing the response of structures during an earthquake (or another dynamic grou... more Procedures for computing the response of structures during an earthquake (or another dynamic ground motion) involves a calculation of the modal participation factor, which formula includes influence vector {r}. The definition of the influence vector is often given as a "displacement transformation vector that expresses the displacement of each structure degree of freedom due to static application of a unit support displacement" or something similar. That kind of definitions produces correct results only in regular structures depending on the directions of the DOFs and the ground excitation. But in many cases the usage the definitions mentioned above leads to wrong results, even sometimes to zero solutions. In this paper another method to calculate the modal participation factor is proposed based on the usage of the load distribution vector {R} and it is correct in all cases. A correct formula for the influence vector as a function of load distribution vector is also proposed.
1. Abstract In this paper the authors make attempt to see from inside the state and problems of a... more 1. Abstract In this paper the authors make attempt to see from inside the state and problems of a part of the very rich architectural and historical heritage of Bulgaria (1, 2, 3). A short review and description of the structures of some typical representatives of historical monuments: fortresses, monasteries, basilicas, churches, cathedrals and bridges are given. The period from
Uploads