Performance of Tuned Mass Dampers in Vibration Response Control of Base-Excited Structures
Alireza Farzampour,
Arash Kamali Asl
Issue:
Volume 2, Issue 3, June 2017
Pages:
87-94
Received:
7 March 2017
Accepted:
29 March 2017
Published:
3 May 2017
DOI:
10.11648/j.jccee.20170203.11
Downloads:
Views:
Abstract: The behavior of structures in recent years indicates that moderate and severe earthquakes lead to substantial damages, extensively higher than what is expected. One solution in order to reduce the seismic response of the structures, especially in relative story displacements is usage of tuned mass dampers (TMD). In this study, comparisons between uncontrolled and controlled cases have been evaluated. Results for an 8-story shear building under specified records show that active tuned mass dampers (ATMD) have more appropriate efficiency in structural displacement response reduction compared to passive tuned mass dampers (PTMD) in spite of high cost of installation. In addition, implementation of PTMD would lead to more desirable results in comparison with uncontrolled case regarding acceleration and displacement time history responses, especially when the natural structures’ frequency is different from the dominant frequency of the records. In addition, usage of ATMD results in significant reduction in the story shear response, whereas PTMD equipped system decreases story shear with a limited margin.
Abstract: The behavior of structures in recent years indicates that moderate and severe earthquakes lead to substantial damages, extensively higher than what is expected. One solution in order to reduce the seismic response of the structures, especially in relative story displacements is usage of tuned mass dampers (TMD). In this study, comparisons between u...
Show More
The Influence of Addition of Date Palm Leaves and Rice Husk on the Mechanical Properties of Cement Mortar
Alaa Ahmed Shakir,
Karim Hadi Ibrahim,
Ali Ahmed Mohammed
Issue:
Volume 2, Issue 3, June 2017
Pages:
95-99
Received:
30 July 2017
Accepted:
18 August 2017
Published:
5 September 2017
DOI:
10.11648/j.jccee.20170203.12
Downloads:
Views:
Abstract: The technological trend towards waste utilization and cost reduction in industrial processing has attracted the use of Rice Husk (RH) and Date palm leaves (DPL) as a value added material. Both RH and DPL have been found suitable for wide range of domestic as well as industrial applications. This paper presents the finding of the investigations done to assess the effect of DPL and RH additions on the properties of cement mortar. Mix design was cement: sand = 1:3, and DPL and RH were added individually to the cement mortar as 1, 1.5, 2, and 2.5% of the total weight of the mix. Fresh density, hardened density, compressive strength, water absorption and modulus of rupture were evaluated. The results revealed that the compressive strength and modulus of rupture decreased with the addition of DPL and RH. However, the compressive strength was slightly higher with the addition of RH than the addition of DPL. Water absorption was increased with the addition of DPL and RH. Additions of RH and DPL to the cement mortar would significantly contribute to waste management and sustainability. Cement mortar produced in this study could be used for finishing.
Abstract: The technological trend towards waste utilization and cost reduction in industrial processing has attracted the use of Rice Husk (RH) and Date palm leaves (DPL) as a value added material. Both RH and DPL have been found suitable for wide range of domestic as well as industrial applications. This paper presents the finding of the investigations done...
Show More
