Structural analysis of circular UHPCC form for hybrid pier under construction loads

2012 ◽  
Vol 12 (2) ◽  
pp. 167-181 ◽  
Author(s):  
X.G. Wu ◽  
X.Y. Zhao ◽  
S.M. Han
Keyword(s):  
Structural Analysis ◽  
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>

Historical Survey

2017 ◽  
pp. 12-50
Keyword(s):  
Structural Analysis ◽  
Historical Development ◽  
Past Research ◽  
Construction Equipment ◽  
Historical Survey ◽  
Bridge Construction ◽  
Analysis Techniques ◽  
Construction Techniques ◽  
Modular Scaffolds ◽  
Construction Loads

Chapter 2 overviews the historical development and past research into temporary structures from 1970 up to 2016 and describe the various problems that have occurred necessitating changes to traditional design and construction techniques. The survey covers tubular, proprietary and modular scaffolds, bridge falsework as well as bridge construction equipment. Particular areas emphasised are the changes introduced by the use of advanced structural analysis techniques and the need for changes in procedures following the analyses of collapses of temporary structures. An overview of various solutions is presented, including the use of different materials (steel, aluminium, timber and bamboo). The chapter shows that same analysis procedures are used for these different materials. The chapter then overviews the actions acting on temporary structures such as permanent loads and variable construction loads and finishes with an introduction to failures of falsework and scaffolding structures.

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.

Structural analysis of the surface-layer protein of spirillum serpens by high-resolution electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 738-739
Author(s):  
W. H. Wu ◽  
R. M. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Structural Analysis ◽  
High Resolution ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Surface Layer Protein ◽  
Morphological Unit ◽  
Resolution Electron

Spirillum serpens possesses a surface layer protein which exhibits a regular hexagonal packing of the morphological subunits. A morphological model of the structure of the protein has been proposed at a resolution of about 25 Å, in which the morphological unit might be described as having the appearance of a flared-out, hollow cylinder with six ÅspokesÅ at the flared end. In order to understand the detailed association of the macromolecules, it is necessary to do a high resolution structural analysis. Large, single layered arrays of the surface layer protein have been obtained for this purpose by means of extensive heating in high CaCl2, a procedure derived from that of Buckmire and Murray. Low dose, low temperature electron microscopy has been applied to the large arrays.As a first step, the samples were negatively stained with neutralized phosphotungstic acid, and the specimens were imaged at 40,000 magnification by use of a high resolution cold stage on a JE0L 100B. Low dose images were recorded with exposures of 7-9 electrons/Å2. The micrographs obtained (Fig. 1) were examined by use of optical diffraction (Fig. 2) to tell what areas were especially well ordered.

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