Identification of structural issues in design and construction of multi- story modular buildings (original) (raw)
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Buildings
The limited knowledge of the behaviour of modular buildings subjected to different loading scenarios and thereby lack of design guidelines hinder the growth of modular construction practices despite its widespread benefits. In order to understand the robustness of modular building systems, a case study was carried out using the numerical analysis method to evaluate the robustness of ten-storey braced frame modular buildings with different modular systems. Two types of modules with different span lengths were used in the assessments. Then, three different column removal scenarios involving (1) removal of a corner column, (2) an edge column, and (3) an interior column were employed to assess the robustness of modular building cases considered. The forces generated in the elements in close proximity to the removed column were verified to assess the robustness of each building case analysed. The results showed that the change in damping ratio from 1% to 5% has no significant influence o...
High rise buildings: design, analysis, and safety ‒ An overview
International Journal of Architectural Engineering Technology, 2021
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 differe...
Emerging trends in the growth of structural systems for tall buildings
Journal of Structural Integrity and Maintenance, 2020
Tall buildings are being built for more than a century now, but there has been an exponential growth in the development of convoluted tall buildings with distinctive architecture. A tall building with a unique structural form, brings forth admonishing challenges for the structural designers to deal with. Such a contemporary inclination towards the fabrication of free-form structures has posed enormous challenges to the modern-day structural engineering community, and consequently, has faced reactions in the form of tremendous researches pertaining to complex building specific issues. This paper extensively reviews six case studies of recent tall buildings that possess a challenging architecture with tortuous structural features to cope with the gravity and lateral loadings. Six representative tall buildings have been chosen from all over the world, which have distinctive features in terms of their structural systems. This paper discusses the fundamental characteristics of these tall buildings in the world and presents the challenges faced during the modelling, analysis, design, and construction of these skyscrapers, along with the brief of methodologies which were eventually adopted to cope with these challenges.
STRUCTURAL DESIGN OF HIGH-RISE BUILDINGS
High-rise buildings are exposed to both static and dynamic loads. Depending on the method used and how the structure is modelled in finite element software the results can vary.
Structural Systems of High-Rise Buildings
Proceedings of the National Aviation University
The article is devoted to topical issues of researching structural designs as a component of high-rise buildings structural system, which form an architectural image and a volumetric three-dimensional structure, consisting of a set of interconnected structural elements that, working together, provide the strength of the volumetric structure, spatial rigidity and overall stability of the object. High-rise buildings use different structural designs, consisting of vertical elements (columns, walls, nuclei, diaphragms etc.) and horizontal elements (floors, beams, slanting belts etc.). Horizontal loadbearing structures of high-rise buildings, are, as a rule, of the same type and represent a rigid reinforced concrete disk (monolithic, precast-monolithic, precast). Horizontal structures carry vertical and horizontal loads and transmit them to load-bearing structures and foundations. To reduce wind effect, aerodynamically efficient cylindrical, pyramidal or prismatic shape of the building is chosen. The high-rise buildings designs have their own specificity, which greatly influences the three-dimensional planning and architectural and design decisions. These features include: significant loads on load-bearing structures; unequal loads on structural elements; high wind load as a horizontal component; problems of joint work of load-bearing structures made of steel and concrete; impact of natural factors (seismic, atmospheric, aerodynamic); influence of technogenic factors (vibrations, noise, accidents, fires, sabotage acts, local destruction); heightened requirements for fire safety and environment control systems; complex engineering and technical support.
Modelling of connections and lateral behavior of high-rise modular steel buildings
Journal of Constructional Steel Research, 2020
Prefabricated Prefinished Volumetric Construction (PPVC), which is a form of modular construction, has been promoted recently for high-rise buildings to raise construction productivity. The flexibility of the inter-module connections and discontinuity of floor slabs of individual modules need to be modelled correctly in the structural analysis since they have direct effect on the building stiffness and its corresponding responses under lateral loads. In this paper, translational spring models are proposed to model the load transfer behavior of the vertical modules connections which are crucial for the structural behavior of high-rise modular buildings. The accuracy of the proposed spring models is investigated by comparing the force distribution and load displacement behavior of modular braced frames with conventional frame model established based on assumptions that the beams are either pin or rigidity connected to the columns. To enhance the productivity and work efficiency of high-rise modular construction, the feasibility of connecting the modules at the corners rather than tying the abutting beams or slabs is proposed. A more realistic approach of modelling the floor slab consisting of multiple modules interconnected at the corners is recommended. The effectiveness of the corner connected modules in transferring the horizontal forces to the building's lateral load resisting systems is evaluated.
Behaviour of Multi-Storey Prefabricated Modular Buildings under seismic loads
Prefabricated Modular Buildings are increasingly becoming popular in the construction industry as a method to achieve financially economical buildings in a very short construction time. This increasing demand for modular construction has expanded into multi-storey applications where the effect of lateral loads such as seismic loads becomes critical. However, there is a lack of detailed scientific research that has explored the behaviour of modular buildings and their connection systems against seismic loads. This paper will therefore present the nonlinear time history analysis of a multi-storey modular building against several ground motion records. The critical elements that need special attention in designing a modular building in similar seismic conditions is discussed with a deeper explanation of the behaviour of the overall system.
Behaviour of Prefabricated Modular Buildings Subjected to Lateral Loads
Prefabricated Modular Buildings are increasingly becoming a highly sort after technology to achieve cost effective and speedy construction in the construction industry. This increasing trend for prefabricated modular buildings has now spread into multi-storey applications since they can provide a much faster output for the ever increasing urban construction demand. In this regard the effect of lateral loads become critical as the height of the buildings increase. Therefore, the design of lateral load resisting systems is vital for these structures to perform effectively. However, there is an absence of detailed scientific research or case studies that investigate into the structural performance of modular buildings. This knowledge gap has resulted in a lack of iv Acknowledgement At the completion of my candidature, I wish to express my sincere and heartfelt gratitude to my supervisors Associate Professor Tuan Ngo, Professor Priyan Mendis, Associate Professor Lu Aye and Dr Robert Crawford. They have helped immensely in creating a welcoming and supportive environment to carry out my research from the beginning to the end. I wish to acknowledge that their expert knowledge and experience which was shared with me without reservations was key to the success of my research. I am also thankful to all former PhD students, post-doctoral researchers and lecturers at the Department of Infrastructure Engineering, The University of Melbourne for their continuous support throughout my candidature. I wish to specially acknowledge the support of the administration staff at the department for their kind and helpful efforts in providing valuable assistance with daily operations as well as other formalities.
2014
Due to excessive displacements of tall buildings occasioned by lateral loads, lateral load resisting systems are usually provided to curtail the load effect. The resistance may be offered by Frame Action, Shear Walls, or combined Walls and Frames (also known as Dual System). In this study, 3D structural modelling base software STAAD-PRO was used to generate and analyze three-dimensional building models for the assessment of the relative effectiveness of the various lateral load resisting systems. Five models were used, one for moment resisting frame & 04 models each for the lateral load resisting systems. Each model consisted of G +10 storey frame structure having total height of 33.0 m. Each building sample was subjected to three-dimensional analysis for the determination of both the lateral displacements at storey top and interstorey drifts. The results of the work showed that the dual system was the most efficient lateral-load resisting system based on deflection criterion, as th...