High-rise buildings have been rapidly increasing worldwide due to insufficient land availability in populated areas and their primary role as essential buildings in modern cities and capitals. However, high-rise buildings are very complicated due to the huge number of structural components and elements unlike low-rise buildings, as well as these high-rise buildings demand high structural stability for safety and design requirements. This paper aims to provide brief information about high-rise buildings regarding the basic definition, safety features, structural stability, and design challenges. A brief description of existing structural systems that are available in the literature is presented to articulate a technical issue that has been widely reported, named, adopting an effective structural system for resisting lateral loads resulting from wind and seismic activities. Consequently, a general overview is presented that covers the behavior of various structural systems for different heights of high-rise buildings by implementing a number of nonlinear static procedure analyses (pushover) and nonlinear dynamic procedure analyses (for wind and earthquake loading). Finally, a critical review of the available simplified model and seismic energy base design are also presented. This paper is intended to help in the development and application of construction systems for high-rise buildings in the future.

The use of concrete reinforced with steel fibers has emerged as an effective material which has the advantages to be used in the most unconventional situations in reinforced concrete structures. These advantages involve reinforcements in structures that intend to resist loads in extreme conditions or change in the type of use, design and or construction errors, degradation of materials (carbonation or corrosion of reinforcement) and also the possible occurrence of accidents such as fires, floods, gusts of wind and earthquakes. In addition, the increasing use of this reinforcement system requires the development of more conclusive studies regarding the characteristics and behaviour of the steel fibers, as well as a critical evaluation of this material and its techniques. This manuscript presents a review on the interaction between steel fibre and the concrete substrate. Initially, a brief description of some fibers materials is made, followed by a summary of some works on adhesion between steel fibres and concrete under static loads. Finally, a summary of the few works on the main contribution of the steel fibers application to increase the strength after the cracking of concrete matrix during loading.

The dynamic behaviour of high-volume fly ash concrete with nano-silica (HVFANS) and polypropylene fibres at curing ages of 7 to 90 days was determined by using a split Hopkinson pressure bar (SHPB) machine. At each curing age, the concrete samples were laboratory tested at different temperatures conditions under strain rates reached up to 101.42 s⁻¹. At room temperature, the results indicated that the dynamic compressive strength of plain concrete (PC) was slightly higher than HVFANS concrete at early curing ages of 7 and 28 days, however, a considerable improvement in the strength of HVFANS concrete was noted at a curing age of 90 days and recorded greater values than PC owing to the increase of fly ash reactivity. At elevated temperatures, the HVFANS concrete revealed a superior behaviour than PC even at early ages in terms of dynamic compressive strength, critical strain, damage and toughness due to increase of nano-silica (NS) activity during the heating process. Furthermore, equations were suggested to estimate the dynamic increase factor (DIF) of both concretes under the investigated factors.