scholarly journals EXPERIMENTAL STUDIES OF PROFILED FLOORING ARCHED UNDER CONSTRUCTION LOADS IN THE SLABS WITH LOWER VAULTED SURFACE SUBWAYS

2017 ◽  
Vol 56 (4-5(56-57)) ◽  
pp. 92-101 ◽  
Author(s):  
A. A. Komlev ◽  
S. A. Makeev
Keyword(s):  
Experimental Studies ◽  
Under Construction ◽  
Construction Loads

One Vanderbilt: Unprecedented Project Delivery Through Integrated Innovation

2019 ◽  
Author(s):  
Andrew Cleary ◽  
Edward M. DePaola ◽  
Christopher R. Horch
Keyword(s):  
New York ◽  
Structural Steel ◽  
Fast Track ◽  
Urban Environments ◽  
Advanced Technology ◽  
Parametric Modelling ◽  
Under Construction ◽  
Construction Loads ◽  
Design Schedule ◽  
Construction Documents

<p>One Vanderbilt Avenue, currently under construction in midtown Manhattan, will be one of the tallest buildings in New York. By collaborating with the construction teams in the early stages of the design, the foundations and the superstructure were able to proceed well in advance of a typical project. For example, the structural steel was erected to the 6th floor, was fabricated to the 32nd Floor, and the shop drawings were checked up to the 45th floor on the day that the 100% Construction Documents were issued.</p><p>The structural steel frame was designed so that its core columns only carried 12 levels of framing and construction loads during the tower’s erection. A concrete shear wall system followed the steel framing, permitting the steel erection to proceed without regard to the concrete operations. When complete, the project will stand 1,401 feet tall and contain 26,000 tons of structural steel, and 93,000 cubic yards of concrete.</p><p>The presentation focuses on the challenges and technological requirements for vertical construction in dense urban environments. It explains the amount of detail, thought, and knowledge of construction that must happen earlier in the design process and the participants will appreciate how the fast‐track process can be applied to complex architectural, mechanical and structural designs.</p><p>It describes the integration of design team parametric modelling with the construction process early in the design schedule. Fast‐track projects with complex designs like One Vanderbilt can be successfully completed by understanding and integrating an IPD process, even with competing objectives. The presentation discusses the challenges and technological requirements for vertical construction in dense urban environments, including the importance of direct links to mass transportation.</p><p>This type of team structure is the future of the industry, and One Vanderbilt is the first of its kind to illustrate how innovative design ambitions are being realized through the use of increasingly refined and advanced technology.</p>

scholarly journals Ways of heat losses reduction in the structural elements of unique buildings

2018 ◽  
Vol 144 ◽  
pp. 04022 ◽  
Author(s):  
Alexey Kochev ◽  
Kirill Lushin ◽  
Mikhail Sokolov ◽  
Elena Kocheva ◽  
Marina Kocheva
Keyword(s):  
Experimental Studies ◽  
Heat Losses ◽  
Structural Elements ◽  
Under Construction

In this article the results of theoretical and experimental studies of the reduction of heat losses in the elements of external enclosing structures of under construction, reconstructed, reconstructed and currently operated unique buildings (monuments of history and architecture) presents.

scholarly journals Fire risk of hull structures made of polymeric composites and ways to mitigate it

2021 ◽  
Vol 2 (396) ◽  
pp. 73-84
Author(s):  
S. Borodai ◽  
◽  
S. Kozlov ◽  
A. Letin ◽  
L. Rozum ◽  
...  
Keyword(s):  
Fire Protection ◽  
High Speed ◽  
Fire Hazard ◽  
Experimental Studies ◽  
Thermal Characteristics ◽  
Fire Risk ◽  
Practical Significance ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Under Construction

Object and purpose of research. The object of the study is polymer composite materials (PCM) used for manufac-turing hull structures of ships and vessels. The main purpose is to find the ways of fire protection of ships and vessels built from these materials. Materials and methods. The results of experimental studies and standard tests on the fire resistance of PCM structures, as well as methods of heat and mass transfer processes simulation in ship premises during fires, were used to determine the thermal characteristics affecting these structures. Main results. The ways of improving the fire safety of ships and vessels with PCM hull structures are determined. The list of problems to be solved in this area is outlined. Also this study has recommendations to improve the fire protection of the ships being designed, under construction and in operation. Conclusion. The structural PCM used in indigenous practice does not meet the current requirements of the International Maritime Organization (IMO) for Maritime Safety for fire protection of high-speed vessels and the requirements for fire protection of Navy ships. Ships that are in service and built using these materials do not provide additional measures to reduce their fire hazard. Fires on such ships can lead to disastrous consequences. It is necessary to solve this problem as soon as possible. The recommendations proposed in this paper on how to solve it, based on a large amount of experimental research, and they have great practical significance.

ON THE USE OF EXPERIMENTAL TESTING IN RC BUILDING STRUCTURES UNDER CONSTRUCTION

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Manuel Buitrago ◽  
Jose M. Adam ◽  
Pedro A. Calderón ◽  
Juan J. Moragues
Keyword(s):  
Experimental Testing ◽  
Experimental Studies ◽  
Building Structures ◽  
Present Level ◽  
Rc Structures ◽  
Rc Building ◽  
History Of ◽  
Level Of Knowledge ◽  
Under Construction ◽  
New Buildings

The current methods of building reinforced concrete (RC) structures have their origins in the first half of the 20th century. In the early stages, not a great deal of attention was paid to their behaviour under construction and not a lot was known about how loads were transmitted between shores and slabs. This meant that in the late 20th and early 21st centuries, there arose an interest in finding out how building structures behaved in the construction stage, and led to a large number of numerical and experimental studies being carried out. This paper gives a chronological account of the different experimental studies on the construction of RC building structures, together with a detailed research history of ICITECH, which in recent years has been a leader in this field, especially in the use of clearing (partial striking). This compilation of all the experimental studies sets out the objectives of each one, the results obtained, the advances achieved, and how each of them has contributed to the scientific community’s present level of knowledge on the behavior of buildings under construction. Another objective of this paper is to make readers aware of the advances that have made it possible for this knowledge to be effectively applied to the construction of new buildings.

scholarly journals Development of Multi-Tee-Type Precast Concrete Slabs with Insulating Materials for Structural Safety at the Construction Stage

2021 ◽  
Vol 11 (4) ◽  
pp. 1693
Author(s):  
Jang-Woon Baek ◽  
Su-Min Kang
Keyword(s):  
Flexural Strength ◽  
Precast Concrete ◽  
Structural Safety ◽  
Shear Reinforcement ◽  
Loading Test ◽  
Construction Stage ◽  
Long Span ◽  
Under Construction ◽  
Construction Loads ◽  
Dapped Ends

Multi-tee-type precast concrete (PC) slab systems are widely used for the construction of modular high-load long-span buildings. However, the structural safety of the dapped end is uncertain, owing to the unanchored shear reinforcement at the construction stage. This study proposes the use of clip-type shear reinforcement at the dapped ends of multi-tee PC slabs to secure their structural performance at the construction stage. To investigate the performance of this approach, a monotonic loading test was performed on simply supported PC slabs, considering structural safety at the construction stage. The reinforcement details of the PC slab’s dapped end (with existing Z-type or proposed clip-type shear reinforcement) and the shear-to-span ratio (12.8 or 6.4) were considered as test parameters. The load–deflection relationship, failure mode, strength ratios to the predicted strength, and shear reinforcement strains were analyzed. The results showed that the tested flexural strength ratio of the PC slabs at the construction stage to the design flexural strength was 1.20–1.40. The enclosed shape and diagonal arrangement of the clip-type shear reinforcement enabled sufficient anchorage performance at the dapped end, indicating that clip-type shear reinforcement can be viable for use at the dapped ends of PC slabs under construction loads.

scholarly journals Parametric study of curved steel I-girder bridges at construction phase.

2021 ◽  
Author(s):  
lhsan-ul Haq
Keyword(s):  
Parametric Study ◽  
Curved Bridges ◽  
Element Analysis ◽  
Girder Bridges ◽  
The Finite Element Analysis ◽  
Truck Loading ◽  
Curved Girder Bridges ◽  
Under Construction ◽  
Strengthening Technique ◽  
Construction Loads

The desire to conform to the existing terrain has largely increased the use of curved bridges for complex interchanges. Bridge curvature produces warping moments (lateral bending moments) in girder flanges under truck loading conditions and even during the construction phase. These warping moments increase girder flexural stresses at construction phase in case of un-shored construction. An extensive parametric study was conducted, using the finite-element analysis software "SAP2000", to examine the key parameters affecting warping stresses in curved girder bridges under construction loads. A strengthening technique "torsion box" at the girder supports was proposed and examined with respect to girder warping, flexural stresses and support reactions. The key parameters considered in this study included number of girders, girder spacing, number of cross bracing intervals, degree of curvature and girder span length. Based on this study empirical expressions for moment and shear distribution factors for the curved girder were developed.

scholarly journals Parametric study of curved steel I-girder bridges at construction phase.

2021 ◽  
Author(s):  
lhsan-ul Haq
Keyword(s):  
Parametric Study ◽  
Curved Bridges ◽  
Element Analysis ◽  
Girder Bridges ◽  
The Finite Element Analysis ◽  
Truck Loading ◽  
Curved Girder Bridges ◽  
Under Construction ◽  
Strengthening Technique ◽  
Construction Loads

The desire to conform to the existing terrain has largely increased the use of curved bridges for complex interchanges. Bridge curvature produces warping moments (lateral bending moments) in girder flanges under truck loading conditions and even during the construction phase. These warping moments increase girder flexural stresses at construction phase in case of un-shored construction. An extensive parametric study was conducted, using the finite-element analysis software "SAP2000", to examine the key parameters affecting warping stresses in curved girder bridges under construction loads. A strengthening technique "torsion box" at the girder supports was proposed and examined with respect to girder warping, flexural stresses and support reactions. The key parameters considered in this study included number of girders, girder spacing, number of cross bracing intervals, degree of curvature and girder span length. Based on this study empirical expressions for moment and shear distribution factors for the curved girder were developed.

Research Flexural Properties of Prestressed Slabs

2015 ◽  
Vol 727-728 ◽  
pp. 417-420
Author(s):  
Xian Hong Meng ◽  
Lin Tong
Keyword(s):  
Mechanical Properties ◽  
Flexural Properties ◽  
Maximum Deflection ◽  
Composite Slab ◽  
Flexural Performance ◽  
Distributed Load ◽  
Under Construction ◽  
Construction Loads ◽  
Plate Deflection

This paper is aimed to study on the flexural performance of prestressed slab and prestressed composite slab ,in order to provide the reference in engineering.At first,the prestressed slab is loaded under unformly distributed load,and then prestressed plate deflection , crack measurements. According to the phenomenon and data of the test, the mechanical properties of prestressed slab is analyzed. The maximum deflection of prestressed slab satisfy the standard requirements under construction loads.

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