This paper presents the shear behavior of lightweight concrete beams
without shear reinforcement produced by scoria aggregates. A total of nine
beams were tested under four-point loads, including three lightweight
concrete beams without steel fibers and six steel fiber reinforced
lightweight concrete beams.
The telescopic cantilever beam is widely used in different types of cranes. These
structures are flexible; it can expand or shrink according to the operating conditions. The
dynamic changes of the total length of the structure lead to time-dependen
t vibrational
characteristics. In practice, CAD modeling for this case is a challenging matter due to the
nature of the problem of analyzing stress and deformation occurring during the operation
of the crane. This research discusses the feasibility of finding a solution for the design
problems initialized during the failure of the telescopic cantilever beam through the
application of Finite Element Analyses (FEA) in order to find the ideal dimension of the
structure which represents the best design for the telescopic cantilever beam.
This research drives at studying the reduction of vibration effect on
central control system located on about 100 m of the Vertical mill
running at New Hama Cement factory , which grinds raw materials
necessary for cement production ,Whereas , the
increase of vibration
intensity leads to vibrate control Instruments beams and the electronic
elements will be damaged.
This research studies the use of outriggers and belt truss system for high-rise composite building subjected to earthquake load, consists of columns (W) and (HP), and beams (W), and central concrete core. Using (SAP2000) in three-dimensional (3D) ana
lysis of building, storey displacements and storey drifts has been compared in four cases:
1. (MWBT): Model without belt truss and outriggers.
2. (MBT2): Model with two belt truss and outriggers at the levels (0.5H, H).
3. (MBT3): Model with three belt truss and outriggers at the levels (0.33H, 0.67H, H).
4. (MBT4): Model with four belt truss and outriggers at the levels (0.25H, 0.5H, 0.75H, H).
Displacements reduction were 41.8%, 67.5%, 75.9%, respectively as compared to a model without any belt truss and outrigger system. So, using outrigger and belt truss system in high-rise buildings increase the stiffness and makes the structural form efficient under lateral load.
This paper makes an experimental and analytical investigation of cracks characteristics in Fiber Reinforced Polymer strengthened RC beams under different levels of sustained load and Reinforced ratio.
As the equations available for conventional RC b
eams are inappropriate for the calculation of the short-term crack width in FRP-strengthened RC beams[8], a statistical analysis is carried out on available test data from international sources [6-9-10] and from the test results obtained in the current study (Concrete Labor- Civil engineering Department- Damascus University-2014) to establish a new equation that considers the effect of the FRP laminates. This equation is a correlation of stress in steel bars, concrete surface tension , and effective side cover.
The long-term crack width is then related to the instantaneous crack width by empirical equations which are derived from the test results obtained in the current study.
Through the last centuries Scientists and Researchers have created analytic and
geographic multi-methods and formulas for the definition of elastic curve’s unknowns of
beams. We have seen that most of these methods had matched in their end formulas
, while
they only differed by the analytic basis for the differentiating of these formulas, that their
introductions depended on different physic expressions and mathematic relations. This
scientific work contains a concise preview for the definition relations and methods of
elastic Curve’s unknowns of beams available, so that the expression about these in an easy
and collective expression with agreement of the depended analytic method by the
Researcher. That can avail of the academic job on the first hand, and it helps the structural
analyzer choose the proper and easier device for his structural analysis for the definition of
elastic Curve’s unknowns of studied structural system.
