Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE
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Structural damage detection using hybrid deep learning algorithm
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 14 Số 2 - Trang 53-64 - 2020
Timely monitoring the large-scale civil structure is a tedious task demanding expert experience and significant economic resources. Towards a smart monitoring system, this study proposes a hybrid deep learning algorithm aiming for structural damage detection tasks, which not only reduces required resources, including computational complexity, data storage but also has the capability to deal with d...... hiện toàn bộ
Mix design of high-volume fly ash ultra high performance concrete
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 15 Số 4 - Trang 197-208 - 2021
The addition of supplementary cementitious materials (SCMs) to replace cement, especially with a high volume (> 50%), is an effective way to reduce the environmental impact due to the CO2 emissions generated in the production of ultra-high performance concrete (UHPC). Unfortunately, no official guidelines of UHPC using a high volume of SCMs have been published up to now. This paper proposes a n...... hiện toàn bộ
#high volume fly ash #ultra-high performance concrete #mix design #packing density #curing condition
Flexural and fracture behavior of high-performance concrete using notch specimen
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 18 Số 3 - Trang 102–113 - 2024
This study investigated the mechanical properties of high-performance concrete using notched specimens. Allflexural specimens had an identical geometry of 40×40×160 mm3 with a span length of 120 mm. Four notchto-depth ratios were as follows: 0 (N0 series), 0.125 (N1 series), 0.250 (N2 series), and 0.375 (N3 series), whichwere designed at the specimen bottom of midspan section. The investigation fo...... hiện toàn bộ
#high-performance concrete #notched specimen #load-carrying capacity #notch-to-depth ratio #critical stress intensity factor
Blast testing of ultra-high performance concrete fortifications using local materials
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 16 Số 4 - Trang 73-86 - 2022
This paper presents experimental results on blast testing of fortifications made from ultra high performance concrete (UHPC) and ordinary concrete (NC) by a non-contact explosion test with the TNT explosive. UHPC and NC samples used in the test were of the type of precast fortification of the real-scale and structure. TNT explosive was used in the test with a mass of 600 g per detonation. The expl...... hiện toàn bộ
#fortifications #ultra-high performance concrete #explosive load #damage area #strain
Influence of fiber size on mechanical properties of strain-hardening fiber-reinforced concrete
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 14 Số 3 - Trang 84-95 - 2020
This research deals with the influences of macro, meso and micro steel-smooth fibers on tensile and compressive properties of strain-hardening fiber-reinforced concretes (SFCs). The different sizes, indicated by length/diameter ratio, of steel-smooth fiber added in plain matrix (Pl) were as follows: 30/0.3 for the macro (Ma), 19/0.2 for the meso (Me) and 13/0.2 for the micro fiber (Mi). All SFCs w...... hiện toàn bộ
Simulation of several flying situations of paragliders
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 15 Số 1 - Trang 79-89 - 2021
Paragliding is an adventure and fascinating sport of flying paragliders. Paragliders can be launched by running from a slope or by a winch force from towing vehicles, using gravity forces as the motor for the motion of flying. This motion is governed by the gravity forces as well as time-varying aerodynamic ones which depend on the states of the motion of paraglider at each instant of time. There ...... hiện toàn bộ
Effect of fiber content on flexural fracture parameters of high-performance steel fiber-reinforced concrete
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 18 Số 1 - Trang 12-23 - 2024
This study deals with the effect of fiber content on fracture parameters of high-performance steel-fiber-reinforced concretes through a bending test program. All the high-performance steel-fiber-reinforced concretes flexural specimens were tested under configuration of three-point loading. The fracture parameters were hardening energy, softening energy and length of cohesive crack. Two steel fiber...... hiện toàn bộ
#fracture energy #deflection-softening #deflection-hardening #cohesive crack #fiber content
Effects of cement paste viscosity on the properties of lightweight expanded polystyrene concrete
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 18 Số 3 - Trang 19–29 - 2024
Lightweight expanded polystyrene concrete (EPS-C) offers several advantages, including low density, sound resistance, and good thermal insulation. These characteristics are contributed by the use of expanded polystyrene (EPS) with a closed cellular structure, which is non-absorbent, hydrophobic, and low-density (around 6.9 kg/m³). Since EPS is much lighter than cement paste, the viscosity of the p...... hiện toàn bộ
#workability #density #viscosity #compressive strength #segregation #lightweight concrete #expanded polystyrene concrete (EPS-C) #viscosity modifying admixture (VMA)
Span length-dependent load-carrying capacity of normal concrete - HPFRC beams
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 15 Số 2 - Trang 26-37 - 2021
The dependence of load-carrying capacity on span length of beams, which contained a combination of normal strength concrete (NC) - High-performance fiber-reinforced concrete (HPFRC), was investigated in this study. The used HPFRC contained 1.0 vol.% long hooked blended with 0.5% short smooth fibers. Two types of span length were designed as 300 mm and 450 mm while dimensions of beam sections were ...... hiện toàn bộ
Optimization of steel moment frames with panel-zone design using an adaptive differential evolution
Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE - Tập 14 Số 2 - Trang 65-75 - 2020
Optimization of steel moment frames has been widely studied in the literature without considering shear deformation of panel-zones which is well-known to decrease the load-carrying capacity and increase the drift of structures. In this paper, a robust method for optimizing steel moment frames is developed in which the panel-zone design is considered by using doubler plates. The objective function ...... hiện toàn bộ
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