An economical structural system for wind and earthquake loads

2001 ◽  
Vol 23 (5) ◽  
pp. 491-501 ◽  
Author(s):  
T Balendra ◽  
C.H Yu ◽  
F.L Lee
Keyword(s):  
Structural System ◽  
Earthquake Loads

Evaluation of the period and soft story conditions of reinforced concrete buildings with and without infill walls

2021 ◽  
Vol 7 (3) ◽  
pp. 151
Author(s):  
Başak Zengin
Keyword(s):  
Reinforced Concrete ◽  
Shear Walls ◽  
Structural System ◽  
Infill Wall ◽  
Infill Walls ◽  
Earthquake Energy ◽  
Ground Floor ◽  
Earthquake Loads ◽  
Soft Storey ◽  
Soft Story

Since the ground floor of most of the buildings in our country is designed as a shop or ground floor (in the buildings created as a workplace), there is very little infill wall ratio on the ground floors due to architectural and functional reasons, and some of them do not even exist at all. However, infill walls significantly increase the horizontal rigidity and strength of the structure, thus causing a decrease in the period value that determines the earthquake loads that will affect the structure. However, the infill wall meets the first destructive forces of the earthquake, and during this time, it cracks and absorbs some of the earthquake energy. The structural system elements of the building (columns and shear walls) start to meet the earthquake forces only when the infill walls are damaged and fail. In this direction, the aim of this study is to investigate to what extent the amount of infill wall on the ground floor affects the period of the building, and whether there are soft storey irregularities in the building according to the change in the amount of infill wall on the ground floor. In this study, while there are infill walls on all floors and all axes of buildings of various heights (3, 6, 9 and 11 floors), the amount of infill walls in the x and y directions on the ground floors is reduced to a certain extent, and many models are created until the ground floor is completely without infill walls. All these models created were analyzed with the support of the SAP2000 program, and the period values were determined and examined according to the soft storey problems and compared with the case of the entire building with and without infill walls. In addition, it was examined whether the period formulas determined as a result of the studies and taking into account the infill wall give realistic results for the situation examined in this study.

scholarly journals The Effect of Lateral Load Type on Shear Lag of Concrete Tubular Structures with Different Plan Geometries

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 897
Author(s):  
Mostafa Moghadasi ◽  
Soheil Taeepoor ◽  
Seyed Saeid Rahimian Koloor ◽  
Michal Petrů
Keyword(s):  
High Efficiency ◽  
Axial Stress ◽  
Lateral Load ◽  
Wind Load ◽  
Tubular Structures ◽  
Structural System ◽  
Shear Lag ◽  
Earthquake Loads ◽  
Tubular System ◽  
Different Types

Tubular structures are extensively recognized as a high efficiency and economically reasonable structural system for the design and construction of skyscrapers. The periphery of the building plan in a tubular system consists of closely spaced columns connected by circumferential deep spandrels. When a cantilever tube is subjected to a lateral load, it is expected that the axial stress in each column located in the flange frame of the tube is the same, but because of the flexibility of peripheral beams, the axial stress in the corner columns and middle columns is distributed unequally. This anomaly is called “shear lag”, and it is a leading cause of the reduction in efficiency of the structure. In this paper, the possible relation between shear lag and the type of lateral load subjected to these systems is investigated. The above relation is not yet considered in previous literatures. Three various plan shapes including rectangular, triangular and hexagon were modeled, analyzed, designed and subjected to the earthquake and wind load, separately. Further work is carried out to compare the shear lag factor of these structures with distinct plan shapes against different types of lateral load. It is observed that all types of structures with various plan geometry subjected to the wind load had a greater amount of shear lag factor in comparison with structures subjected to the static and dynamic earthquake loads. In addition, shear lag in structures with the hexagon shaped plan was at the minimum.

scholarly journals Diagonal reinforcement as strengthening to increase the stiffness and strength of concrete frame

2018 ◽  
Vol 195 ◽  
pp. 02033 ◽  
Author(s):  
Yenny Nurchasanah ◽  
Muhammad Ujianto ◽  
Abdul Rochman
Keyword(s):  
Structural Analysis ◽  
Opposite Direction ◽  
Lateral Loading ◽  
Structural System ◽  
Concrete Frames ◽  
Earthquake Loads ◽  
Concrete Frame ◽  
Lateral Forces ◽  
Diagonal Reinforcement ◽  
Test Objects

Two test objects of concrete frame behavior against lateral loading were performed by applying structural analysis with the wall as diagonal reinforcement in modeling. The results of the structural analysis indicated that concrete frames with walls have better performance than concrete frames without walls. Twelve objects consisting of the frame without the wall, frame with the wall, and frames with a group of steel and bamboo as diagonal reinforcement at brick walls and concrete panel walls were tested at the laboratory with monotonic lateral forces that work parallel to the wall as the illustration of earthquake loads. The diagonal reinforcement elements can spread the force received by the wall and increase the strength of the wall as well as enhance the stiffness of the structural system at once. Bracing contributes to increasing the strength, especially in resisting the compressive forces due to the earthquake loads. Deformation occurs in the opposite direction between compression path and tension path at the diagonal area. The failure in the concrete frame can be caused by the in-plane force parallel to the wall. Bamboo is quite effective to be used as a substitute for steel reinforcement as bracing material despite its shortage of steel quality.

Error analysis of structural system identification by observability method

2017 ◽  
Vol 109 (7) ◽  
pp. 3254-3261
Author(s):  
Jun LEI ◽  
Dong XU ◽  
José Antonio Lozano-Galant ◽  
María Nogal ◽  
José Turmo
Keyword(s):  
System Identification ◽  
Error Analysis ◽  
Structural System ◽  
Structural System Identification

COMPREHENSIVE REFORMING OF TECHNOLOGICAL, FUNCTIONAL AND STRUCTURAL SYSTEMS OF SKIN UNITS OF HOSPITALS

2020 ◽  
pp. 211-218
Author(s):  
Владимир Григорьевич Донцов ◽  
Елена Владимировна Донцова ◽  
Любовь Анатольевна Новикова ◽  
Лариса Николаевна Борзунова
Keyword(s):  
Service System ◽  
Medical Examination ◽  
Structural Systems ◽  
Structural System ◽  
Structural Units

В статье доказана порочность переустройства только одной структурной системы (реструктуризации), так как это чревато поломками элементов, звеньев и блоков, сомой системы кожной службы. Допустимо лишь незначительная адаптация к конкретным условиям больниц, где это будет внедряться. Сформулированы понятия конечного результата работы врачей и структурных подразделений медицинских стационаров в современных условиях общественно-политической формации. Описаны преимущества реконструкции комплекса систем судебно-медицинской экспертизы как экспериментальной службы для кожного отделения городской многопрофильной больницы и работы самого кожного отделения. Описана форма структурного построения судебно-медицинской и кожной служб. По аналоги с экспертным учреждением ожидаются аналогичные изменение конечного результата в кожном подразделении многопрофильного стационара The article proves the viciousness of the reorganization of only one structural system (restructuring), since this is fraught with breakdowns of elements, links and blocks, the soma of the skin service system. Only slight adaptation to the specific conditions of the hospitals where it will be implemented is acceptable. The concepts of the final result of the work of doctors and structural units of medical hospitals in the modern conditions of the socio-political formation are formulated. The advantages of reconstruction of a complex of forensic medical examination systems as an experimental service for the skin department of a city multidisciplinary hospital and the work of the skin department itself are described. The form of structural structure of forensic and skin services is described. By analogy with an expert institution, a similar change in the final result is expected in the skin department of a multidisciplinary hospital

scholarly journals Parametric Analysis of the Shear Lag Effect in Tube Structural Systems of Tall Buildings

2020 ◽  
Vol 11 (1) ◽  
pp. 278
Author(s):  
Ivan Hafner ◽  
Anđelko Vlašić ◽  
Tomislav Kišiček ◽  
Tvrtko Renić
Keyword(s):  
Parametric Analysis ◽  
Numerical Models ◽  
Tall Buildings ◽  
Structural Systems ◽  
Structural Elements ◽  
Structural System ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Lag Effect ◽  
Secondary Structural Elements

Horizontal loads such as earthquake and wind are considered dominant loads for the design of tall buildings. One of the most efficient structural systems in this regard is the tube structural system. Even though such systems have a high resistance when it comes to horizontal loads, the shear lag effect that is characterized by an incomplete and uneven activation of vertical elements may cause a series of problems such as the deformation of internal panels and secondary structural elements, which cumulatively grow with the height of the building. In this paper, the shear lag effect in a typical tube structure will be observed and analyzed on a series of different numerical models. A parametric analysis will be conducted with a great number of variations in the structural elements and building layout, for the purpose of giving recommendations for an optimal design of a tube structural system.

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