Comparison study of total displacements of multi-story buildings subjected to earthquake using synthetic timehistory records compatible with Syrian code

Response spectrum analysis and equivalent static analysis is widely used by engineers and engineering offices to estimate buildings and structures response to earthquakes. But performance based procedures to evaluate buildings and new designs according to Syrian code and other international codes require response analysis using smallest of earthquake records, where we can estimate engineeringdemandparameters(EDPs)— floordisplacements,storydrifts,memberforces,memberdeformations,etc.— ofbuildingsandspecialstructuressubjectedtogroundmotions, consecutively to verify required performance criteria. Theserecordsshouldbeproperlyselectedandscaledincompliancewithsitespecifichazardconditionstoestimate (EDPs) and ensure that they verify ―expected‖ median demands. In this study, background, selection procedures compatible with Syrian code, and review of most scaling methods were introduced. The structural response was studied by comparing displacements due to response spectrum analysis, scaled records using PGA, and synthetic time histories records in time domain and frequency domain (generated according to Syrian response spectrum). Tow three-dimensional models of real buildings in Lattakia city were used as study cases, the results obtained by 20 analysis processes. The results show that analysis using synthetic records compatible with Syrian code give noticeably less displacements estimates comparing with response spectrum analysis and analysis using records scaled by PGA scaling.

The combination of singular solutions of infinite micropolar elastic body with axisymetric state of elastic strain and subjected to temprrature field

This paper concerns the mathematical, linear model of micropolar elastic, homogeneous and isotropic body, of axisymetric state of small deformations, in the frame of the linear theory of micropolar elasticity with six material constants . In the paper, first we introduce the dynamic displacements-rotation-temperature equations for the considerable body in the axisymetric state of small deformation , subjected to temperature field.

Efficiency of the geodetic methods in evaluating operations of Carbon Fiber Reinforcement

The research aims to study the possibility of using practical methods to monitor the geodetic vertical deformations, and to study the engineering of the origin of the strengthened carbon fiber. Because of proposed changes in the construction status of some of its elements, the study will be accompanied by simulation of the proposed changes by adding additional live and dead loads, that are equivalent to the new situation. This study will be made by measuring the vertical displacements for some points of those elements within optimal control network based on geodetic network confidence requirements. This study will also assess the potential use of electronic digital high accuracy levels and the supplied software. The research succeeds in showing the possibility of quantifying the potential deformations in reinforced elements, as well as the efficiency of the proposed method of control and the equipment used.