Development of computational software for analysis of curved girders under construction loads

2003 ◽  
Vol 81 (21) ◽  
pp. 2087-2098 ◽  
Author(s):  
Cem Topkaya ◽  
Eric B. Williamson
Keyword(s):  
Curved Girders ◽  
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 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.

Reliability Analysis of H-Beam Transfer Truss Under Construction Loads

2010 ◽  
Vol 163-167 ◽  
pp. 745-748
Author(s):  
Zheng Fa Chen ◽  
Gui Feng Liu
Keyword(s):  
Reliability Analysis ◽  
Calculation Model ◽  
Office Building ◽  
Force Analysis ◽  
H Beam ◽  
Under Construction ◽  
Construction Loads ◽  
The Right ◽  
Design And Application

Study on the reliability of H-beam transfer truss was based on the rebuilding of 1# office building of Chinese Ministry of Commerce. Under construction loads, the force analysis of the H-beam transfer truss was carried out with the software STS2005.12. In the paper, the right of trusses node connection was first chosen, and a plane calculation model of H-beam transfer truss was established based on some reasonable assumptions. Then, the force of H-beam transfer truss under construction loads was analyzed with the calculation model, in determining a reasonable control indexes and calculation parameters. From the results of analysis, we could see that the design and application of H-beam transfer truss in the stage of construction was safe and reliable, in the dismantling concrete post of old structure.

A Magnetic Spectrometer for a Scanning Transmission Electron Microscope

1974 ◽  
Vol 32 ◽  
pp. 436-437
Author(s):  
A. Kosiara ◽  
J. W. Wiggins ◽  
M. Beer
Keyword(s):  
Scanning Transmission Electron Microscope ◽  
Magnetic Spectrometer ◽  
Fringe Field ◽  
Curvature Radius ◽  
Magnetic Pole ◽  
Quadrupole Field ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Under Construction ◽  
Image Position

A magnetic spectrometer to be attached to the Johns Hopkins S. T. E. M. is under construction. Its main purpose will be to investigate electron interactions with biological molecules in the energy range of 40 KeV to 100 KeV. The spectrometer is of the type described by Kerwin and by Crewe Its magnetic pole boundary is given by the equationwhere R is the electron curvature radius. In our case, R = 15 cm. The electron beam will be deflected by an angle of 90°. The distance between the electron source and the pole boundary will be 30 cm. A linear fringe field will be generated by a quadrupole field arrangement. This is accomplished by a grounded mirror plate and a 45° taper of the magnetic pole.

Radiation Damage Studies with the HVEM

1972 ◽  
Vol 30 ◽  
pp. 680-681
Author(s):  
J. J. Laidler ◽  
B. Mastel
Keyword(s):  
Radiation Damage ◽  
Stainless Steels ◽  
Volume Expansion ◽  
Austenitic Stainless Steels ◽  
Test Facility ◽  
Fast Breeder Reactors ◽  
Breeder Reactors ◽  
Under Construction ◽  
Development Laboratory ◽  
Insight Into

One of the major materials problems encountered in the development of fast breeder reactors for commercial power generation is the phenomenon of swelling in core structural components and fuel cladding. This volume expansion, which is due to the retention of lattice vacancies by agglomeration into large polyhedral clusters (voids), may amount to ten percent or greater at goal fluences in some austenitic stainless steels. From a design standpoint, this is an undesirable situation, and it is necessary to obtain experimental confirmation that such excessive volume expansion will not occur in materials selected for core applications in the Fast Flux Test Facility, the prototypic LMFBR now under construction at the Hanford Engineering Development Laboratory (HEDL). The HEDL JEM-1000 1 MeV electron microscope is being used to provide an insight into trends of radiation damage accumulation in stainless steels, since it is possible to produce atom displacements at an accelerated rate with 1 MeV electrons, while the specimen is under continuous observation.

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