Staged-Construction Analysis of High-Rise Buildings with Post-tension Slabs

Elansary, Ahmed A.; Mabrouk, Abdullah; Zawam, Mohamed; El-Attar, Adel

doi:10.1007/s13369-021-06462-1

Cited by 3 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…29,30,33 Further research on the effect of service loads during the construction of HRB on the design of PT floors is needed. Elansary et al 1 studied SCA effects on both serviceability and strength of PT slabs in 15 HRBs using ACI 318-19 85 code provisions. The authors reported that the code checks using SCA were different from OSA by 5%-65% and 5%-20% for serviceability and strength checks, respectively.…”

Section: Effect Of Sca On Analysis Of Pt Floorsmentioning

confidence: 99%

“…One of the HRB construction challenges is to try to keep slabs at their design elevations in spite of the gradual shortening of columns and walls (as discussed in Section 3). The numerical simulation of this issue was discussed by previous studies, [1][2][3][4] while field investigations for it were performed by other studies. 8,12,13,19 The aforementioned studies have shown that the resultant deformations and straining actions will be affected by the method by which this height loss is compensated.…”

Section: Leveling During Constructionmentioning

confidence: 99%

“…3,30,41 On the other hand, HRBs were reported to be greatly affected by SCA. [1][2][3][8][9][10]12 Lack of provisions may be also attributed to the limited number of studies that linked problems in structures (such as cracks in elements or excessive DAS) to the failure to conduct SCA. 16,33,41,65,92 One study by Ha and Lee 16 showed a cracking pattern in slabs and beams of an HRB in Korea due to improper structural analysis that poorly estimated DAS.…”

Section: Buildings With Pt and Non-pt Floorsmentioning

confidence: 99%

“…Neglecting the sequential nature of construction during an analysis of high‐rise buildings (HRBs) can lead to inaccurate prediction of deformations and internal forces 1–4 . Traditionally, structures were analyzed using one‐step analysis (OSA) assuming that all loads are applied at once 5–7 .…”

Section: Introductionmentioning

confidence: 99%

“…7 Recognition of SCA importance has broadened with the advances in material sciences and computational capabilities that were twined with the development of the HRB construction. 1,13,14 Previous researches explored the advantages of adopting SCA instead of OSA in predicting deformations and internal forces in structural components of HRB. [15][16][17][18][19][20] Construction sequence tends to affect the long-term serviceability of floor slabs and often their ultimate strength.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Staged‐construction analysis of high‐rise buildings: A literature review and future perspectives

Elansary

Mabrouk

El-Attar

2023

Structural Design Tall Build

Self Cite

View full text Add to dashboard Cite

SummaryStaged‐construction analysis (SCA) has recently become a noticeable trend for estimating the design forces and deformations for high‐rise buildings (HRBs). SCA is a nonlinear step‐by‐step analysis that simulates the construction activities and conditions. It is a numerical simulation that considers loading history during construction, time‐dependent material behavior, environmental conditions, and any special measures taken by contractors to limit differential axial shortening during the construction process. However, building codes and guidelines do not provide adequate provisions that clearly identify how to approach this type of analysis. This paper presents a comprehensive state‐of‐the‐art review on how SCA was previously adopted in theoretical research and how it was applied in real buildings. It begins by critically reviewing different research work on SCA. Afterward, the paper puts forward the recent fundamentals of conducting SCA. Then, a series of studies about verifying SCA as practical analysis procedure using field measurements are then presented. In addition, the current paper reviews how SCA can specifically affect post‐tension slabs. Based on this review, several recommendations are provided to help in shaping the future code provisions, add to the development of recent practices, and inspire future research. The conducted review concludes that more investigations should be performed to better understand the effect of considering SCA on the deformations and design forces during HRB analysis.

show abstract

Section: Effect Of Sca On Analysis Of Pt Floorsmentioning

confidence: 99%

Section: Leveling During Constructionmentioning

confidence: 99%

Section: Buildings With Pt and Non-pt Floorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Staged‐construction analysis of high‐rise buildings: A literature review and future perspectives

Elansary

Mabrouk

El-Attar

2023

Structural Design Tall Build

Self Cite

View full text Add to dashboard Cite

show abstract

Structural system yielding minimum differences between ordinary and staged analyses

2023

View full text Add to dashboard Cite

Structural engineers should appropriately design concrete structures to resist lateral loads. Determining the adequate system for resisting the expected lateral loads is important to control the building drift. Choosing the appropriate system is usually conducted assuming the predicted forces are applied to completed concrete buildings at one step which is commonly known as ordinary analysis (OA). Nevertheless, these structures are constructed sequentially which requires using staged analysis (SA) instead of OA. In this paper, a comprehensive numerical model for SA of concrete buildings, which accounts for time dependent effects, is utilized using a well-validated commercial software. Six reinforced concrete buildings with 10 and 20 storeys are analyzed using the developed model. Three various structural systems are considered (Rigid Frame (RF), Shear Wall (SW), and Wall Frame (WF). A comparison is conducted between the displacements and internal forces in beams and slabs obtained from the SA and OA. For a 10-storeys RF building, maximum bending moment from SA is 29.9% higher than that from OA. The same conclusion was observed for the maximum shearing force with a percentage of 19.6%. Moreover, maximum bending moments and shearing forces from SA for the 20-storeys RF building are, respectively, 35.0% and 23.5% larger than those from OA. The RF and WF systems provided the minimum difference in differential displacement between the OA and SA analyses. The RF system produced the least differences in internal forces from OA and SA for all studied buildings.

show abstract

Assessment of mitigation alternatives for differential shortening in high-rise reinforced concrete buildings

Elansary,

Metwally,

El-Attar

2023

J. Eng. Appl. Sci.

View full text Add to dashboard Cite

Selecting appropriate structural system for reinforced concrete (RC) buildings is essential in the design process to satisfy serviceability and strength requirements. Using ordinary analysis (OA) may result in inaccurate estimation of differential shortenings (DS) between vertical supporting elements which might lead to structural and architectural problems. Efficiency of staged analysis including time-dependent effects (SAT) has been recently recognized for the analysis of these buildings due to considering the sequential nature of construction. In this research, eight RC buildings with heights ranging between 35 and 175 m and various structural systems, namely rigid frames (RF), shear walls (SW), wall frames (WF), and tube in tube (TT), are analyzed. An assessment is conducted for the adequacy of three mitigation alternatives to decrease changes between DS estimated using OA and SAT. In Alternative 1, cross sections of all vertical elements (columns and shear walls) are increased by 50%. Alternative 2 is performed by iteratively proportioning the dimensions of internal columns without changing the cross sections of edge and corner vertical elements. One outrigger system is introduced along the height of buildings with WF and TT systems in Alternative 3. Analysis of the eight buildings is implemented by developing a numerical model considering the construction stages and time-dependent effects. The alternatives assessment is conducted by comparing differential displacements (DD), bending moments, and shearing forces before and after mitigation obtained from OA and SAT. The numerical results showed that Alternative 1 is not efficient in mitigating the differences between the OA and SAT for all the studied buildings. However, an optimum solution can be achieved using the Alternative 2 for all investigated systems. Also, Alternative 3 was found adequate in partially mitigating the differences between the two analyses for the buildings with WF and TT systems.

show abstract

Staged-Construction Analysis of High-Rise Buildings with Post-tension Slabs

Cited by 3 publications

References 27 publications

Staged‐construction analysis of high‐rise buildings: A literature review and future perspectives

Staged‐construction analysis of high‐rise buildings: A literature review and future perspectives

Structural system yielding minimum differences between ordinary and staged analyses

Assessment of mitigation alternatives for differential shortening in high-rise reinforced concrete buildings

Contact Info

Product

Resources

About