Journal of Recent Activities in Infrastructure Science

Magnetic Vibration Absorber for Controlling Beam Vibration

Sribash Das, Bayazid Hossain, Md. Shafiqul Islam — Thu, 14 Mar 2024 00:00:00 +0000

In the realm of engineering structures, such as beams, the occurrence of unwanted vibrations
poses significant challenges, including fatigue, discomfort, noise, and potential structural failure.
To address these issues, vibration absorbers are extensively employed to mitigate and manage
excessive vibration. A critical factor determining their efficacy is ensuring that the absorber's
frequency aligns with the excitation frequency to effectively dampen system vibration. This paper
aims to investigate the optimal spacing between the vibration absorber's magnets, recognizing the
direct correlation between magnet spacing and the absorber's stiffness. Consequently, variations
in stiffness induce corresponding changes in frequency. By studying these relationships, this
research seeks to elucidate the precise magnet spacing required to tune the absorber's frequency
to match the excitation frequency of the cantilever beam. Such tuning facilitates the efficient
minimization of beam vibration when subjected to the excitation frequency. This study underscores
the paramount importance of precise magnet spacing in designing vibration absorbers that
resonate harmoniously with the excitation frequency, thereby enhancing structural integrity and
mitigating unwanted vibrations.

Seismic Study of Water Tank Considering Soil Structure Interaction in Various Zones

Nidhi Kushwah, Rahul Sharma — Mon, 29 Apr 2024 00:00:00 +0000

The design guidelines provide stringent requirements for water tightness and crack prevention in addition to high serviceability requirements to reduce reinforcing steel leaks and corrosion. More attention is put on accurately computing the controlling design forces to meet economic and serviceability criteria in light of these stringent limitations. Few studies have considered the connection between soil structure and dynamic soil pressure while conducting a seismic survey of an underground water tank. The current research compares the output results to comprehend the behaviour of an underground water tank exposed to soil structural interaction and seismic stress. Existing underground water tanks were utilized for the investigation, and by IS 1893 part-2-2014, finite element modelling of the identical tanks was completed in ETABS17 for two distinct soil conditions.

Numerical Investigation on the Effect of Partially-Inclined Reinforcement on the In-Plane Behavior of Shear-wall

Fri, 05 Apr 2024 00:00:00 +0000

A shear wall is a structural component commonly used in buildings to resist lateral loads such as
wind and seismic forces. They are vertical elements typically made of reinforced concrete,
masonry, or steel. The effectiveness of shear walls in resisting lateral loads depends on various
factors including their size, material properties, connection details, and the overall structural
design of the building. An innovative idea of a concrete shear wall with partial diagonal
reinforcement was introduced in this paper. All specimens were modelled and analyzed with the
finite element software ABAQUS. The investigation was carried out to investigate the global
behaviour of the shear wall in terms of lateral load and story drift response, yielding of
reinforcement, and plastic concrete strain by varying the angles of inclined reinforcement from
45° to 65°. The research shows that the seismic performance of the shear wall in particular its
resistance to sliding shear, was improved through this layout of the inclined reinforcement.
Compared to the other shear walls, the shear wall with 60° partial rebars has a maximum lateral
strength.

Optimum Positioning of Shear Walls in High-Rise Buildings Using STAAD Pro

Asha Bhayal, Rahul Sharma — Tue, 30 Apr 2024 00:00:00 +0000

Shear wall systems are among high-rise buildings' most widely used and feasible lateral loadresisting
technologies. Their high plane stiffness and strength simultaneously support huge
horizontal and gravity loads. It is increasingly essential for multi-storey structures to include
shear walls to withstand lateral pressures like wind and seismic stresses. Therefore, it is crucial to
ascertain where shear walls will function best. Shear wall placement has to be done precisely
since anything less will work against you. The distance of the shear wall from the mass centre also
significantly impacts the shear wall's shear contribution when the hardness centre and mass centre
coincide. This project is a research to find the best possible structural arrangement for a multistorey
structure by drastically altering the placements of the shear walls. Using computer
application software called ETABS, four distinct scenarios of shear wall placement for a G+10
storey structure that maintains zero eccentricity between the mass and hardness centres have been
examined, and a frame system has been created. In compliance with IS requirements, the framed
structure is subjected to lateral and gravity loads; the results are examined to ascertain the best
location for the shear wall.

Assessment of Compliance and Welfare of Construction Workers at Selected Building Construction Project in Kathmandu: Implications for Labor Act Implementation

Subash Kumar Bhattarai, Diksha Dahal, Uttame Neupane — Thu, 11 Apr 2024 00:00:00 +0000

This study assesses compliance and welfare among construction workers at selected building construction projects in Kathmandu, examining implications for Labor Act implementation. Utilizing literature review and questionnaire surveys, data from 228 workers, with 99 in the sample, were analyzed. The questionnaire surveyed 31 special Labor Act provisions, employing dichotomous questions. Results show high worker awareness of rights under the Labor Act, notably regarding employer duties, non-discrimination, working hours, overtime, and safety. However, gaps exist in awareness regarding remuneration, transportation, and timely wage payment. Mann-Whitney U tests comparing male and female respondents revealed no statistically significant differences in scores, suggesting gender neutrality in compliance perceptions. Challenges in labor law enforcement, including insufficient mechanisms, resource constraints, and monitoring gaps, were identified. Recommendations include strengthening enforcement, enhancing awareness, capacity-building, and stakeholder collaboration. Continuous monitoring and evaluation are emphasized to ensure construction worker welfare in Kathmandu.