In this study, a novel interrelationship between the ventilation rate and the solar chimney design parameters, EAHE geometrical specifications, pressure drop, and climatic conditions in the hot arid area was presented based on experimental and numerical comprehensive investigations. This new correlation simplified designing and optimizing of the passive cooling/heating and ventilation system. Moreover, this correlation was used in a case study of passive cooling/heating and ventilation of a two-stories residential building in Egypt by TRNSYS simulation. The indoor operative air temperatures, heating and cooling loads, thermal comfort conditions, energy consumptions/savings, and CO2 emission savings were calculated and analyzed. Two cases were simulated and compared with the basic-case. In case 1, the basic-case combined with the solar chimney and EAHE. Case 2 had a hybrid passive and active ventilation, which included case 1 equipped with electrical fans that continued operating for 24 h. Finally, an economic study was conducted to calculate the payback period and discount payback period for the construction of such a system using the local Egyptian market equipment. The basic case results show that the zonal temperature was more than the ambient temperature yearly, and in summer, the indoor temperature exceeded the surrounding temperature by 5–6 °C. Using the proposed system in case 1 and case 2 attained a zonal temperature around 5 °C and 9 °C less than the ambient temperature in the summer season, respectively. However, the total annual electrical energy and CO2 emission savings were 42.9 kWh/m2/year and 4.545 tons/year, respectively, in case 2. Finally, the simple payback period was 5.4 years, and the discount payback period was 6.8 years.

Basalt fibre reinforced polymer (BFRP) bamboo sandwich structure is composed of BFRP material and bamboo lumber, which can overcome the disadvantages of the industrial bamboo material such as poor shear performance, and severe corrosion damage, and effectively improve mechanical properties. Specimens of BFRP-bamboo sandwich panels were prepared using compression molding technique. Through tensile test, compression test, bending test, and shear test, the basic mechanical properties of the novel BFPR-bamboo sandwich structure were studied. The comparison tests with the control specimens of the laminated bamboo lumber (LBL) and the parallel bamboo strand lumber (PBSL) show that: (1) the tensile capacity of bamboo laminates has increased by 15.1% and 16.5% respectively, and the hybrid principle of composite materials can predict its tensile properties; (2) the compressive capacity increased by 39.9% and 21.8%, and the compressive behaviour can be estimated using the column buckling theory; (3) both the flexural bearing capacity and deformability are improved, and the flexural bending properties can be analyzed based on the theory of composite sandwich structure; (4) after composite with BFRP, the shear capacity can be increased by 44% and 22% respectively.

This paper suggests using a combination of steel and fiber-reinforced polymer (FRP) reinforcements to introduce sustainable reinforced concrete moment-resisting frames (RC-MRFs) characterized by damage-controlled seismic performance, cost-effectiveness, and postearthquake recoverability. The aim of this study is twofold. First, according to a predefined seismic performance of RC-MRFs, this study introduces the optimum replacement ratio of the longitudinal FRP reinforcement of FRP RC-MRFs with steel bars. Second, this study investigates the application of FRP-steel reinforcement details to alleviate damage in the plastic-hinge zones of the beams. A detailed three-dimensional finite-element model (3D-FEM) of an RC-MRF is developed and validated against the experimental results of a large-scale, two-bay, two and half story MRF entirely reinforced with FRP rebars and stirrups. Results indicate that compared with FRP RC-MRFs, for a replacement ratio of FRP reinforcement ≤42%, the serviceability state of the proposed steel–FRP RC-MRFs is characterized by a controlled deformability, and the ultimate state is characterized by an acceptable residual lateral strength ensuring safe exit of the structure from its functionality. Furthermore, when steel reinforcements are only provided at the ends of the beams, the frame lateral deformability is based on the development of two sequential plastic hinges at each end of the beams, leading to higher deformability and lower damage levels.

This paper analytically estimates the damping behaviors of a new type of self-damping fiber reinforce polymer (FRP) cables. Based on the vibration results of scale-model dynamic tests, the modal damping ratios of non-self-damping FRP cable were firstly analyzed using the modified formula of the self-damping FRP cables and the combined Rayleigh and frequency independent damping (CRFID) model. According to the energy dissipation mechanism and structural characteristics of the self-damping FRP cable, analysis modal damping models are proposed. Compared with the test results, the availability of the analysis models is verified. The results indicated that: the damping coefficient of the dynamic strain of a non-self-damping FRP cable is larger than that of a steel cable and a basalt FRP (BFRP) cable, and smaller than that of the carbon FRP (CFRP) cable; the proposed model can effectively evaluate the damping ratios of the in-plane vibration of a self-damping FRP cable under different amplitudes; and the damping ratios of the out-of-plane vibration of self-damping and non-self-damping FRP cables can be well predicted using the CRFID model.

Application of fiber reinforced polymer (FRP) cables on long-span cable-supported bridges can overcome the disadvantages of traditional steel cables such as heavy weight, obvious sag effect, decreasing carrying efficiency, pronounced fatigue degradation, and serious corrosion damage. On the basis of theoretical analyses and experimental studies on the application of FRP cable in long-span cable-supported bridges, the research progress in recent years on the key issues of FRP cables in long-span cable-supported bridges is reviewed in detail. The basic mechanical properties of FRP cables, the static and dynamic behavior of long-span cable-supported bridge with FRP cables, and the economic performance of long-span cable-supported bridges with FRP cables are discussed. The results show that FRP cables have the feasibility to be used in long-span cable-supported bridges from the mechanical properties. However, due to the poor shearing and bending performance of FRP cables, abundant nonlinear dynamic behavior, complex dynamic performance of bridges, and insufficient practical experience, the application of FRP cables in long-span cable-supported bridges is facing great difficulties. Accordingly, the future research directions on the application of FRP cables on the long-span cable-supported bridge are addressed.

This study presents an innovative hybrid profiled steel- and fiber-reinforced polymer (FRP) reinforced concrete (HPSFRC) structural system that primarily consists of thin semiclosed T-shaped cold-formed steel sheeting that is externally enclosed with an FRP sheet and filled with concrete. The experimental study was conducted in two interdependent parts: a development study and a validation study. In the development study, six specimens were tested to determine the best interlocking technique between the concrete flange and the other components of the cross section. In addition, two specimens were examined to define the shear strength of the steel-concrete composite profiled system. The validation study presented the flexural behaviors of HPSFRC T-beams with different reinforcement configurations. The test results of the HPSFRC beams were assessed in terms of the behavior of a conventional reinforced concrete T-beam and a composite profiled T-beam. The HPSFRC T-beams achieved a ductility comparable to that of a composite profiled beam but exhibited a higher flexural strength. The flexural behaviors of the HPSFRC beams can be controlled using additional longitudinal reinforcement at the beam tension side. The beam with additional steel bars exhibited ductile behavior with a stable increase in the beam resistance to the applied load; however, the addition of FRP layers enhanced the flexural capacity of the beam and greatly controlled the deformability of the beam after steel yielding, resulting in the lowest measured residual deflection.

This study presents an innovative hybrid profiled steel- and fiber-reinforced polymer (FRP) reinforced concrete (HPSFRC) structural system that primarily consists of thin semiclosed T-shaped cold-formed steel sheeting that is externally enclosed with an FRP sheet and filled with concrete. The experimental study was conducted in two interdependent parts: a development study and a validation study. In the development study, six specimens were tested to determine the best interlocking technique between the concrete flange and the other components of the cross section. In addition, two specimens were examined to define the shear strength of the steel-concrete composite profiled system. The validation study presented the flexural behaviors of HPSFRC T-beams with different reinforcement configurations. The test results of the HPSFRC beams were assessed in terms of the behavior of a conventional reinforced concrete T-beam and a composite profiled T-beam. The HPSFRC T-beams achieved a ductility comparable to that of a composite profiled beam but exhibited a higher flexural strength. The flexural behaviors of the HPSFRC beams can be controlled using additional longitudinal reinforcement at the beam tension side. The beam with additional steel bars exhibited ductile behavior with a stable increase in the beam resistance to the applied load; however, the addition of FRP layers enhanced the flexural capacity of the beam and greatly controlled the deformability of the beam after steel yielding, resulting in the lowest measured residual deflection.

This study presents an innovative hybrid profiled steel- and fiber-reinforced polymer (FRP) reinforced concrete (HPSFRC) structural system that primarily consists of thin semiclosed T-shaped cold-formed steel sheeting that is externally enclosed with an FRP sheet and filled with concrete. The experimental study was conducted in two interdependent parts: a development study and a validation study. In the development study, six specimens were tested to determine the best interlocking technique between the concrete flange and the other components of the cross section. In addition, two specimens were examined to define the shear strength of the steel-concrete composite profiled system. The validation study presented the flexural behaviors of HPSFRC T-beams with different reinforcement configurations. The test results of the HPSFRC beams were assessed in terms of the behavior of a conventional reinforced concrete T-beam and a composite profiled T-beam. The HPSFRC T-beams achieved a ductility comparable to that of a composite profiled beam but exhibited a higher flexural strength. The flexural behaviors of the HPSFRC beams can be controlled using additional longitudinal reinforcement at the beam tension side. The beam with additional steel bars exhibited ductile behavior with a stable increase in the beam resistance to the applied load; however, the addition of FRP layers enhanced the flexural capacity of the beam and greatly controlled the deformability of the beam after steel yielding, resulting in the lowest measured residual deflection.

This study presents an innovative hybrid profiled steel- and fiber-reinforced polymer (FRP) reinforced concrete (HPSFRC) structural system that primarily consists of thin semiclosed T-shaped cold-formed steel sheeting that is externally enclosed with an FRP sheet and filled with concrete. The experimental study was conducted in two interdependent parts: a development study and a validation study. In the development study, six specimens were tested to determine the best interlocking technique between the concrete flange and the other components of the cross section. In addition, two specimens were examined to define the shear strength of the steel-concrete composite profiled system. The validation study presented the flexural behaviors of HPSFRC T-beams with different reinforcement configurations. The test results of the HPSFRC beams were assessed in terms of the behavior of a conventional reinforced concrete T-beam and a composite profiled T-beam. The HPSFRC T-beams achieved a ductility comparable to that of a composite profiled beam but exhibited a higher flexural strength. The flexural behaviors of the HPSFRC beams can be controlled using additional longitudinal reinforcement at the beam tension side. The beam with additional steel bars exhibited ductile behavior with a stable increase in the beam resistance to the applied load; however, the addition of FRP layers enhanced the flexural capacity of the beam and greatly controlled the deformability of the beam after steel yielding, resulting in the lowest measured residual deflection.

This paper proposes an analytical method for predicting the nonlinear behavior of reinforced concrete (RC) beams after flexural strengthening with near surface mounted (NSM) fiber reinforced polymer (FRP) laminates. With a gradual increase in the beam curvature and a step-by-step numerical integration method, an algorithm model was designed for predicting the load-deflection response of RC beams strengthened with the NSM technique. Based on the bond mechanism between the NSM FRP laminates and the surrounding concrete, the available calculation methods of the load bearing capacity of RC beams with NSM FRP laminates were derived according to the bearing capacity model for the strengthened RC structure with FRP materials. Using the proposed model, the load-deflection responses of five flexural strengthened RC beams with NSM carbon FRP (CFRP) laminates were analyzed and verified against the experimental results. The presented results indicate that the proposed model based on the available test data can accurately analyze the tensile stresses of the NSM CFRP laminates. Moreover, the results prove the feasibility of the designed algorithm model in precisely predicting the nonlinear behavior of RC beams strengthened with NSM CFRP laminates. The proposed algorithm model could provide a much needed link between structural design and nonlinear behavior analysis of RC structures strengthened with the NSM technique.