Journal of Construction and Building Materials Engineering

Performance Evaluation of Pre-Engineered Building with Different Slopes

Bhuvan S Somanna, N. Venkata Ramana, H. Eramma, Madhukaran — Mon, 27 Jul 2026 00:00:00 +0000

Pre–engineered buildings (PEBs) are increasingly preferred in industrial, commercial, and storage applications due to their cost–effectiveness, reduced construction time and structural efficiency. The roof slope is a critical design parameter influencing structural performance, material consumption, drainage and overall stability. This study evaluates the structural performance of PEB frames with varying roof slopes of 1 in 10, 1 in 15 and 1 in 20 under different loading conditions as per IS 800:2007 and IS 875 guidelines. A 48 m span, 8 m eave height steel frame is modeled in STAAD Pro V8i with tapered sections to assess parameters such as maximum deflections, axial force distribution, bending moments and weight optimization. Comparative results indicate that increasing slope improves drainage efficiency and reduces horizontal thrust, but it may lead to a marginal increase in steel consumption. The findings provide valuable insights for selecting optimal roof slopes in PEB design, balancing structural performance and economy.

Impact of Constant Strain Level (CSL) and Additives on the Flow Number (FN) of Asphalt Concrete (AC)

Saad Sarsam — Sat, 02 May 2026 00:00:00 +0000

The flow number (FN) of asphalt concrete (AC) is the number of load repetition cycles at which the flow of aggregates within the AC structure begins, microcracking initiation, and permanent damage occur in the AC mixture. Such a flow of material constitutes an AC structure that can be differentiated by a significant variation from the linear trend relationship between the number of loading cycles and cumulative strain. Such permanent strain (PS) is unrecoverable. The FN is an important variable since it correlates well with the rutting potential of AC pavement. In this work, the influence of binder additives such as silica fumes (SF) and coal fly ash (CFA) on the FN of the AC mixture was investigated. Slab samples of roller compacted AC (control and modified) have been prepared with optimum binder requirements. AC beam specimens were obtained from the prepared AC slab samples and tested for fatigue life (FL) with the aid of a dynamic four-point flexural bending beam test under a moderate environment of 20°C. It was noticed that the implementation of coal fly ash into the AC mixture exhibits a significant decline in FN by (16.6% and 33.3%) for (400 and 750) CSL, respectively, when compared with the control AC mixtures. Implementation of silica fumes into the AC mixture exhibits a significant increase in FN at high constant strain levels by 77.7% for 750 constant microstrain levels when compared with the control AC mixtures; however, the variation in FN under (250 and 400) microstrain levels was not significant. Power mathematical models were obtained representing the rate of change in the FN of the AC mixture through FL due to the implementation of additives.

Seismic Vibration Control of Buildings Using Friction Dampers and Base Isolation Techniques

Konatham Koteswara Rao, Komma Anil Kumar, Nayab Mahaboobsubhani, Nagaraju Kola — Thu, 23 Jul 2026 00:00:00 +0000

Over the last four decades, research on methods to reduce earthquake impacts on buildings has significantly increased, following the advent of base isolation techniques and energy dissipation devices. This surge in research is attributed to advancements in the field. Investigations have focused on the effects of lead rubber bearings (LRB) as base isolators and friction dampers as energy dissipation devices, both individually and in combination, within an eight-storey ‘C’-shaped structure. The analysis was executed using the ETABS program, applying linear response spectrum analysis methodology due to the building being located in seismic zone 4. Response factors studied include time period, base shear, storey displacement, and storey drifts. Findings indicate that the integration of these devices, both separately and as part of a dual control system, reduced the structural responses, enhancing the building’s seismic resistance. This enhancement was achieved through a decrease in energy within the building. The study also compares the results obtained from these methods against traditional models, highlighting improvements in performance.