Universiti Putra Malaysia

King Saud University

Mohd Saleh Jaafar

Farzad Hejazi

Abdulrahman Alhozaimy

Abdulaziz Al-Negheimish

Jamaloddin Noorzaie

Mohd Azmi Mohd Zain

Amir Fateh

Omer A Alawad

The present invention relates to a viscoelastic bracing damper (), comprising: a cylinder (); an inner core () extended through the cylinder () without contacting an inner surface of the cylinder (), thereby having a barrel portion formed between the inner surface of the cylinder () and the inner core (); a joint () connecting a front connector () to one end of the inner core (); a stopper () connecting an end connector () to an another end of the inner core (); and characterised by a damping means () extended substantially along a length of the barrel portion; wherein the damping means () is compressed between the inner surface of the cylinder () and the inner core () for absorbing vibration loads.

Viscoelastic bracing damper

The present invention relates to a volumetric compression restrainer (), characterised by: an outer casing () comprising a pair of C-shaped structures interconnected to one another to form a cylinder; a plurality of partitions () arranged in a parallel manner along length of an inner surface of the pair of C-shaped structures with a spacing therebetween; an inner core () extending through the outer casing (), whereby the plurality of partitions () enclosed the inner core (); a plurality of hollow plates () mounted on the inner core (), for spacing and upholding the inner core (); a plurality of damping means () wrapped over the inner core (), arranged in a manner of the plurality of damping means () positioned between the plurality of partitions () and the plurality of hollow plates (); and a connecting means having a front connector () engaged to one end of the inner core () and an end connector () engaged to the other end of the inner core (), for installing the volumetric compression restrainer () to a structure joint.

Volumetric compression restrainer

The present invention provides a viscoelastic wall panel damping device () that provides damping against multidirectional reacting dynamic loads that include in-plane shear force resistance and out of plane force resistance. The viscoelastic wall panel damping device () of the present invention, including an assembly () having a pair of symmetrically opposing surfaces formed by a pair of damping element planar members () that sandwiches a rigid planar member (). The assembly () being overlaid by a pair of face plates (), a proximal face plate () and a distal face plate (). Aforementioned pair of face plates () and the rigid planar member () of the assembly () having a plurality of vertically oriented stiffener members () comprising of vertically oriented welded strips () of steel disposed with stiffener elements () at spatial intervals along the length of said welded strips of steel (). Aforementioned pair of face plates () further being disposed at respective outer surfaces () with a plurality of horizontal stiffener members ().

Wall panel damping device

A concrete product is produced by providing red dune sand having a particle size of 45 microns or less and mixing the red dune sand with hydraulic cement in a ratio of about 30% of the cement being replaced by the red dune sand. The cement and red dune sand are then mixed with fine and course aggregate, water and a superplasticizer and cast after pouring into a mold cavity. Then within 24 hours of casting, the cast article is steam cured for 12 hours under atmospheric pressure, demolded and placed in an auto clave at 100% humidity. The temperature in the auto clave is raised to 180&#xb0; C. within one to two hours and maintained at that temperature for 4 to 5 hours. The temperature also increases the pressure to about 10 bars. The pressure is released to reach atmospheric pressure within 20-30 minutes and the temperature reduced gradually, so that the article can be removed.

Cement/aggregate composition, concrete product and method for making a concrete product

The present invention relates to a variable stiffness bracing device comprising: a rectangular frame () having a solid quarter cylinder () at each angle of the rectangular frame (); a pair of leaf spring () attached at each end of the rectangular frame () at the solid quarter cylinder (); a steel rail () fixed on top middle of the rectangular frame (); a core () fixed at the tip of each leaf spring (), the core () is slidable along the steel rail (); a cubic core () located in the middle of the core (); and a rod cable () passes through each end of the rectangular frame () and the core () and ended at the cubic core () located in the middle of the core (). The above provision is advantageous as the present invention deploys wholly mechanical in retrofitting and rehabilitation of structures.

Variable stiffness bracing device

A raw batch composition for concrete or concrete wherein the raw batch composition comprises Portland cement of about 15 wgt. % to about 45 wgt. % and dune sand preferably red dune sand is present in an amount of about 40 wgt. %. The dune sand has a particle size of less than or equal to 45 microns. The composition also includes limestone powder ranging from about 15 wgt. % to 45 wgt. % with particle sizes less than or equal to 45 microns to form a base material. To this base material suitable amounts of fine aggregate, coarse aggregate, water and superplasticizer are added. A method for producing a cast concrete product having a compressive strength of between 62 MPa and 90 MPa is disclosed. The method comprises a step of providing Portland cement, dune sand and limestone powder.

Growing community of inventors

Serdang, Malaysia

Mohd Saleh Jaafar