Simplified column shortening analysis of a multi‐storey reinforced concrete frame

Kim, Han‐Soo; Jeong, Se-Min; Shin, Sang‐Goo; Park, Jae-Pyo

doi:10.1002/tal.607

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…Column shortenings of a 70-storey reinforced concrete frame-shear wall building were investigated as a numerical example. Kim et al [13] also noted that their study improved the previous study presented by Choi and Kim [3] by considering the inelastic shortening due to creep and shrinkage. In order to be more practical and computer friendly, Kim [14] proposed an improved analysis method for column shortening of tall buildings based on a matrix analysis method of frames.…”

supporting

confidence: 53%

“…Creep was more effective in columns due to high compressive stresses, thus it was reported that a considerable amount of load was transferred from columns to shear walls. Kim et al [13] outlined an improved column shortening analysis method that was aimed to be used at the design stage of tall buildings. This method considered construction sequences, the restraining effect of horizontal members, as well as creep and shrinkage.…”

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confidence: 99%

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A Practical Compensation Method for Differential Column Shortenings in High-rise Reinforced Concrete Buildings

Seçer

Zamani

İşler

2020

Period. Polytech. Civil Eng.

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High-rise reinforced concrete buildings have technical, economic and environmental advantages for high density development and they have become a distinctive feature for densely populated urban areas around the world. For this purpose, structural design of high-rise reinforced concrete buildings have become forward and particularly serviceability requirements gained more interest. Differential shortening of vertical members is one of the serviceability requirements; however, only a limited number of studies exist. In this study, a practical compensation method was proposed for the differential shortening of columns and shear walls in high-rise reinforced concrete buildings. In the proposed compensation method, vertical members were grouped and the total error was aimed to be minimized by penalizing the higher shortening differences in the groups to simplify the process of building construction. In order to validate the proposed method, a 32-storey high-rise building that was built in Izmir Turkey was investigated considering both the construction sequence and time-dependent effects as shrinkage and creep. Vertical shortening of columns and shear walls in the tower part of the building were calculated. Uniform-grouped compensation method and the proposed penalized errors compensation method with using L1-norm and L2-norm were applied for differential shortenings of columns and shear walls with considering different numbers of member groups. The magnitude of errors for each compensation method was presented and evaluated. Results of the numerical study reveal that the proposed penalized errors compensation method was capable of determining the compensation errors by minimizing the maximum errors efficiently.

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confidence: 53%

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confidence: 99%

A Practical Compensation Method for Differential Column Shortenings in High-rise Reinforced Concrete Buildings

Seçer

Zamani

İşler

2020

Period. Polytech. Civil Eng.

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“…Kim et al are among researchers who studied this issue in 2012: They undertook a two‐step analysis algorithm to accurately estimate columns' shortening . They evaluated the restraining effect of horizontal elements and optimized the distribution of additional reinforcements in reducing the extent of shortening in 2013 and 2015, respectively .…”

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confidence: 99%

The effect of constant and seasonal changes of ambient conditions on long‐term behavior of high‐rise concrete structures

Afshari

Kheyroddin

Gholhaki

2018

Structural Design Tall Build

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Summary Temperature is one of the most important factors affecting the long‐term behavior of concrete: Its remarkable impact is directly involved in the analysis and design of structures. In this paper, the effect of ambient temperature on the development of modulus of elasticity, creep, and the shrinkage of concrete with time is investigated under nonlinear staged analysis. This is performed under two sections of constant temperature changes with four different temperatures as indicators of the spectrum from cold to tropical cities, and the seasonal changes in ambient conditions with real growth of creep curves and modulus of elasticity in four modes of the construction start at each of the four seasons of the year, giving indications of the long‐term behavior of high‐rise dual systems and special moment resisting frames. The structures are designed optimally, based on the results of the conventional one‐step analysis and regardless of inelastic strains and temperature effects. This ensures that after applying the concrete time‐dependent parameters at desired temperatures and redesigning according to new forces of nonlinear staged analysis, the feasibility of comparing changes in sections and drifts of the structures can be established. The results show that summer is the worst season to start construction.

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“…Hence, the only way to avoid these adverse effects is estimation of the real behavior of structure which is only possible through nonlinear staged analysis or consideration of all long-term elastic and inelastic strains of concrete. Kim et al are among researchers who have studied about this issue in 2012 who raised two-step analysis algorithm to accurately estimate columns' shortening [7]. They evaluated the restraining effect of horizontal elements and optimized distribution of additional reinforcement in reducing the extent of shortening respectively in 2013 and 2015 [8,9].…”

Section: Introduction 1research Backgroundmentioning

confidence: 99%

Simplified Time-Dependent Column Shortening Analysis in Special Reinforced Concrete Moment Frames

Afshari

Kheyroddin

Gholhaki

2017

Period. Polytech. Civil Eng.

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Necessity for adaption of high-rise reinforced concrete structures' design and practical steps of implementation through nonlinear staged analysis by consideration of long-termAttention to adaption of structural design with practical implementation steps by applying priority and posteriority of construction schedule into the structural design in form of sequential construction analysis has always been strongly recommended by researchers and scholars in recent years. Basically, all floors of the structure are simultaneously subjected to dead and live loads in conventional structural analyses. While the dead loads of the structural elements and floors are gradually applied to the previously constructed members during the progress of construction which depends on method of construction and its executive arrangements [1] On the other hand, it is obvious that the dead load of newly added elements during construction is carried by the same part of the structure which has been constructed up until that point. Thus, distribution of stresses and displacements caused by the load of existing parts at any stages is independent of size, properties and the presence of other elements which have not entered the construction process [2]. Examples of individuals who studied about above subjects are Choi and Kim (1985) who introduced sequential construction with the concept of active floor in structural analysis [3]. The principles of active floor's analysis are based on three concepts of active floor, inactive floor and deactivated Floors with a reverse order of actual process of construction which is from top to bottom and performing analysis as much as the number of floors in the structure. Use of substructuring technique can be helpful in reduction of number and volume of calculations [4,5]. In this method, floor by floor activation process can be done for a group of floors which will increase computing speed and will reduce the time and computational efforts. Choi, Chung, Lee and Wilson presented a simple method to simulate the actual behavior of structure based on practical construction steps in 1992 named Correction Factor Method (CFM) and considered the effects of sequential construction in structural analysis [6]. The mentioned method is able to modify the results of conventional one-step structural analyses only using correction factors and without the need for accurate and time-consuming staged analysis and it is able

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Simplified column shortening analysis of a multi‐storey reinforced concrete frame

Cited by 8 publications

References 7 publications

A Practical Compensation Method for Differential Column Shortenings in High-rise Reinforced Concrete Buildings

A Practical Compensation Method for Differential Column Shortenings in High-rise Reinforced Concrete Buildings

The effect of constant and seasonal changes of ambient conditions on long‐term behavior of high‐rise concrete structures

Simplified Time-Dependent Column Shortening Analysis in Special Reinforced Concrete Moment Frames

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