Geometrical Nonlinear Analysis Based on 2th order theory of two and three dimensional Framed Structure Using a Modified Finite Element Method

In this work, a modified finite element displacement approach is used to analyze two and three dimensional Framed Structure. The element is based on second order theory.

Design of tow-story precast structure composed of Steel and concrete enabling of producing varied and multi functional house units good for Rapid construction and Reconstruction

The recent situation in Syria requires the creation of new housing units models take into account the functional, architectural, and safe requirements, in addition to specialty of local and living conditions. The created models must achieve family protection, time gaining, using local materials, ability of transporting, reselling, rapid construction, and supporting reconstruction plans. This paper introduces, for the first time in Syria the study, design, fabricating, and erecting of tow-story precast structure composed of reinforced concrete slabs and walls, and light-weight steel structure fully connected by bolts. This structure was designed and implemented in a way that enables producing varied and multi functional house units achieving safety and functional conditions, and rapid construction and reconstruction requirements. The study was introduced by the authors and it was implemented in the General Company of construction in Lattakia. New production lines of housing units were created from scratch by consulting contract between Tishreen University (the authors) and General Company of construction. In less than one year four housing units were designed and produced:1- tow-story continuous building, 2-disaster housing unit, 3- general marketing unit, 4- school unit. These units achieve all above mentioned requirements.

Seismic Performance Evaluation of Existing Bridges According to the Recent Requirements of AASHTO Using Nonlinear Static Analysis (Case Study of Al Khreibat Bridge on Lattakia -Tartous Road)

Bridges are important and vital structures that provide communication between different regions. Due to their importance, their design has had a great attention throughout the world, as evidenced by the continuous development of seismic design codes such as AASHTO, which now adopts the performance-based design, and requires through a set of requirements and criteria that the bridge performance under the design earthquake is at life safety (LS) level and thus ensures that it does not collapse. Since most of the local bridges were built at periods where these criteria were not adopted, it is important to verify their performance and that they meet these criteria. In this paper, the seismic performance of an existing bridge, which represents a model for a wide range of local multi-span simply supported bridges, was evaluated by developing a 3D model of the bridge using SAP2000V19.1 and applying the nonlinear static analysis. The results of analysis have been used to verify that the bridge meets the AASHTO seismic requirements, which include the check of the P-Δ requirement, displacement demand/ capacity, members (columns) ductility, as well as the check of the shear demand/capacity of the columns. The results showed that the performance of the studied bridge under the seismic intensities adopted in the Syrian code achives the acceptable level which is life safity (LS), but it exceeds this level under high seismic intensity. The research also showed that there is compatibility between the results of nonlinear static analysis and AASHTO requirements.