The Structural Response of Precast Sandwich Panel Under Axial & Lateral Load PDF Download

Author: Chiang Chew Heng
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 186

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Author: Abdelfattah Elnur Abbaker
Publisher:
ISBN:
Category : Concrete panels
Languages : en
Pages : 252

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The sandwich panel is a layered structural system composed of a low density core material bonded to and acting integrally with, a relatively thin high strength facing materials held together by shear connectors. Core material usually act as insulation material t reduce the temperature inside the building. The bending action due eccentric load or lateral load is resisted by the tensile and compressive forces developed in outer layers while shear forces are resisted by the shear connectors. Sandwich panels are used as exterior walls in multi unit, resedential, commercial and ware house building, providing structural and thermal efficient building element. In this study, the structural behaviour of reinforced concrete sandwich wall panel has been investigated experimently in pre and post-cracking phase. Each panel consists of two outer reinforced concrete layers, interconnecyed together by different layout reinforced concrete ribs, which act as shear connectors. Three layers of shear connectors have been selected for the study; these are continuous vertical concrete ribs and truss type layout ribs inclined at 45 o and 67.5 o with the vertical. Finite element method has been used in analysis for comparison with the experimental test results in the pre-packing phase and to determine the stress distribution developed in the different components of the sandwich panel under different loading conditions. Six specimen of reinforced concrete sandwich panels (two identical specimens for each shear connector layout) each pf size 1200 x 2400 mm (width x height) have been cast in the laborotary and tested in vertical position under incremental vertical axial, lateral, and combined axial and lateral loading. The effect of different shear connector layout on the overall structural behaviour of the panel is highlighted. Moreover the composite behaviour of the sandwich panels, the percentage of load transferred to the ribs and the crack pettern have been investigated and discussed. The structural response of the sandwich panel in term of deflections have been found equal to 35 mm, 27 mm, 22 mm for panels typa A,B and C respectively. The lateral collapse load of the tested panels, have been found equal to 97 KN, 40 KN and 45 KN for panels type A, B and C respectively. From the results obtained in this study, it has been found that the sandwich panels with very vertical shear connector has a better overall structural response as reflected in the integrity of the sandwich wall panels system under action of combined axial and lateral loads, in comparison to sandwich panels with inclined layout connectors.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 622

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Precast concrete sandwich panels are commonly used on building exteriors. They are typically composed of two concrete wythes that surround rigid insulation. They are advantageous as they provide both structural and thermal resistance. The structural response of sandwich panels is heavily influenced by shear connectors that link the wythes together. This thesis presents a study on partially composite non-prestressed precast concrete wall panels. Nine flexure tests were conducted on a wall design incorporating 'floating' concrete studs and Glass Fibre Reinforced Polymer (GFRP) connectors. The studs encapsulate and stiffen the connectors, reducing shear deformations. Ultimate loads increased from 58 to 80% that of a composite section as the connectors' reinforcement ratio increased from 2.6 to 9.8%. This design was optimized by reinforcing the studs and integrating them with the structural wythe; new connectors composed of angled steel or Basalt-FRP (BFRP) were used. The load-slip response of the new connector design was studied through 38 double shear push-through tests using various connector diameters and insertion angles. Larger connectors were stronger but more likely to pull out. Seven flexure tests were conducted on the new wall design reinforced with different combinations of steel and BFRP connectors and reinforcement. Composite action varied from 50 to 90% depending on connector and reinforcement material. Following this study, the axial-bending interaction curves were established for the new wall design using both BFRP and steel connectors and reinforcement. Eight panels were axially loaded to predesignated loads then loaded in flexure to failure. A technique is presented to experimentally determine the effective centroid of partially composite sections. Beyond the tension and compression-controlled failure regions of the interaction curve, a third region was observed in between, governed by connector failure.Theoretical models were developed for the bond-slip behaviour of the shear connection and to analyze the full panel's flexural and axial response to determine the longitudinal shear force transferred between wythes and account for partial composite behavior. The models were validated against experiments and used to conduct a parametric study. Among several interesting findings, the study demonstrated how composite action increases with the slenderness of axially loaded panels.

Author: K. M. Kripanarayanan
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 100

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Contents : Rept. 2. Philosophy of structural response to normal and abnormal loads. -- Rept. 3. Wall panels: analysis and design criteria. -- Rept. 4. A design approach to general structural integrity.

Author: fib Fédération internationale du béton
Publisher: FIB - Féd. Int. du Béton
ISBN: 2883941246
Category : Technology & Engineering
Languages : en
Pages : 146

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During the mid-20th century, with the rise of industrial prefabrication, precast concrete sandwich panels started being used as cladding for buildings. Since then, society and construction industry have become increasingly aware of energy efficiency in all fields, including affordability and sustainability consciousness, while maintaining the buildings’ durability. As such, buildings have been subject to increasingly stringent requirements which has kept the technology of sandwich panels continually at the forefront of building envelope evolution. Nowadays, sandwich panels have reached the highest standards of functional performance and aesthetic appeal. In building construction, these sandwich panel attributes combine with the well-known advantages of prefabrication including structural efficiency, flexibility in use, speed of construction, quality consciousness, durability, and sustainability. Sandwich panels have gained more exposure, thus representing quite a significant application within the prefabrication industry and a vital component of the precast market. The fib Commission “Prefabrication” is eager to promote the development of all precast structural concrete products and to share the knowledge and experience gained, to aid with practical design and construction. By issuing this comprehensive overview, “Guide to Good Practice”, a better understanding of design considerations, structural analysis, building physics, use of materials, manufacturing methods, equipment usage and field performance will be provided. This document contains the latest information currently available worldwide. The Commission is particularly proud that this document is a result of close cooperation with PCI and that it is published by both the fib and PCI. This cooperation started six years ago, first with comparing the different approaches to several issues, then progressively integrating and producing common documents, like this one, that hasn’t yet been treated in a specific Guide by either body. This Guide is intended to be the reference document to all who are interested in utilising the advantages of Precast Sandwich wall panels. In conjunction with the previously published Planning and Design Handbook on Precast Building Structures, the designer will have significant resources to integrate sandwich wall panels into any applicable structure.

Author: Behnam Naji
Publisher:
ISBN:
Category : Concrete panels
Languages : en
Pages : 69

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Book Description
Several experimental studies have shown the effect of core shear contribution in precast concrete sandwich wall panels. Due to the complex nature of such construction, quantifying the contribution of the core on the behavior of the precast concrete sandwich wall panel subjected to lateral load and in-plane loads is still a challenge. Based on engineering judgment and experience, current design practices assume a certain percentage in composite action between the faces (wythes) of the sandwich panel. In this study, a general equation for the deflection of a simply supported sandwich panel under in-plane and lateral loads was developed. The formulated equation includes all mechanical properties of the core and the thick similar faces. Methods for calculating bending moments and stresses to design the precast concrete sandwich wall panel were developed and validated. The proposed equations allow for parametric studies without limitations regarding reinforcements, core shear mechanical properties, and geometrical dimensions.

Author: Paul M. Hopkins
Publisher:
ISBN: 9781321934854
Category : Concrete panels
Languages : en
Pages : 456

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Precast insulated concrete sandwich panels have been used with proven success in commercial building application as wall elements to provide both vertical and lateral strength and thermal and environmental protection. Various configurations and materials have been used to provide certain degrees of strength, thermal resistance and composite action. The mechanics of the sandwich panel rely on the transfer of compressive and tensile forces due to flexure via shear through the web connectors. These web connectors have varied from steel wire trusses to carbon fiber composite grid trusses to solid concrete zones. For optimum thermal performance the connectors not providing a thermal bridge are best suited. For optimum strength and stiffness performance the shear connectors that create the highest degree of composite action and anchorage in the concrete zones shall be used. Furthermore, if the insulated concrete sandwich panels can be better understood, developed and tested in the horizontal application rather than as a wall element, they can be used for roof and possibly floor applications. This will provide environment and thermal resistance and required strength and stiffness. This study investigates the design and testing of several scaled test sandwich panel configurations using solid web FRP plate shear connectors. The stiffness, strength and degree of composite action for each set of panels is calculated and compared and finally 2 full scale test panels are developed and tested. Along with testing and calculations, numerical modeling or finite element analysis is employed to show correlation between the test results for future development of an analytical model. Precast concrete sandwich panel engineering performance varying depending on the degree of composite action of its constituent materials and strength of properties. Employing a nonlinear numerical solver that can capture the quasi-static response of the panels under flexural loading is valuable and desirable for future development. These test panels, both scaled and full-scale show adequate results for strength, stiffness and degree of composite action to justify further development and research into their use as roof or floor structural support members. Long term creep effects have also been investigated in this study, however further creep studies are warranted and recommended. Finally, these panels are not limited to the use of residential and commercial application, rather they have the potential as suitable candidates for structures intended to provide blast and/or accidental explosion protection.

Author: Manish Shrikhande
Publisher: Springer Nature
ISBN: 9819916089
Category : Science
Languages : en
Pages : 769

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This book presents select proceedings of the 17th Symposium on Earthquake Engineering organized by the Department of Earthquake Engineering, Indian Institute of Technology Roorkee. The topics covered in the proceedings include engineering seismology and seismotectonics, earthquake hazard assessment, seismic microzonation and urban planning, dynamic properties of soils and ground response, ground improvement techniques for seismic hazards, computational soil dynamics, dynamic soil–structure interaction, codal provisions on earthquake-resistant design, seismic evaluation and retrofitting of structures, earthquake disaster mitigation and management, and many more. This book also discusses relevant issues related to earthquakes, such as human response and socioeconomic matters, post-earthquake rehabilitation, earthquake engineering education, public awareness, participation and enforcement of building safety laws, and earthquake prediction and early warning system. This book is a valuable reference for researchers and professionals working in the area of earthquake engineering.

Author: Hong Hao
Publisher: CRC Press
ISBN: 1351850202
Category : Science
Languages : en
Pages : 1935

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Mechanics of Structures and Materials: Advancements and Challenges is a collection of peer-reviewed papers presented at the 24th Australasian Conference on the Mechanics of Structures and Materials (ACMSM24, Curtin University, Perth, Western Australia, 6-9 December 2016). The contributions from academics, researchers and practising engineers from Australasian, Asia-pacific region and around the world, cover a wide range of topics, including: • Structural mechanics • Computational mechanics • Reinforced and prestressed concrete structures • Steel structures • Composite structures • Civil engineering materials • Fire engineering • Coastal and offshore structures • Dynamic analysis of structures • Structural health monitoring and damage identification • Structural reliability analysis and design • Structural optimization • Fracture and damage mechanics • Soil mechanics and foundation engineering • Pavement materials and technology • Shock and impact loading • Earthquake loading • Traffic and other man-made loadings • Wave and wind loading • Thermal effects • Design codes Mechanics of Structures and Materials: Advancements and Challenges will be of interest to academics and professionals involved in Structural Engineering and Materials Science.

Author: Amir Hossein Haji Mirarab
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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A novel, light gauge steel stud-thin shell precast concrete panel system was developed to serve as a vertical wall panel element to resist vertical and out-of-plane horizontal loads. The behavior and capacity of this system to sustain in-plane lateral loads arising from wind and earthquake actions are currently not understood. The focus of this research is to assess the performance of such a system when subjected to lateral loading. Two-dimensional monotonic and reverse cyclic nonlinear finite element analyses of the Thin Shell Precast (TSP) panel was conducted using Program VecTor2. The analyses evaluated the effect of various components of the system including the type and size of the internal reinforcing bars and the influence of the exterior light-gauge steel framing. The modelling also shed light on the effect of reinforcement bonding and the difference in response between squat and slender wall systems. Through the nonlinear modelling, lateral load-displacement (drift) responses were generated for monotonic and reverse cyclic motions, in addition to quantifying the yield and ultimate loads and corresponding displacements (drifts). Preliminary analyses were used to modify the design of the Thin Shell Panel to achieve an improved lateral response.