scholarly journals Application Of The Distributed Plasticity Concept In Quick Nonlinear Analysis Of Reinforced Concrete Shear Walls

2015 ◽  
Vol 5 (1) ◽  
pp. 109-118
Author(s):  
F. S. Trifa ◽  
A. Cătărig
Keyword(s):  
Reinforced Concrete ◽  
Calculation Method ◽  
Poisson Ratio ◽  
Shear Walls ◽  
Calculation Model ◽  
Shear Deformations ◽  
Strength Capacity ◽  
Strength And Stiffness ◽  
Simplified Calculation ◽  
Experimental Researches

Abstract The paper presents a simplified calculation method to predict, as accurate as possible, the most important characteristics of the behaviour of the slender reinforced concrete shear walls in the inelastic range: failure mode, strength capacity, flexural and shear deformations, sectional and element ductility. The formulation is based on nonlinear beam element with taking into account the influence of shear, both on strength and stiffness of the wall. The principal parameters incorporated in the calculation model are: the rectangular shape of the cross section, the aspect ratio of the wall, the most accurate constitutive relationships for the compressed concrete and for the reinforcement steel, both in compression and in tension (including the strengthening of the steel after yielding), the variation of the Poisson ratio of the concrete, the amount and distribution of the vertical reinforcement. The model uses the concept of distributed (smeared) plasticity along the element and so the flexural deformations are computed by integrating the actual curvatures on the height of the wall. The shear deformations are also calculated, in agreement with the results of some recent experimental researches. The calculation method was then applied to two experimental wall specimens and their force – horizontal top displacement curves were plotted.

Discussion on the Rationality Simplified Calculation Method of Reinforced Concrete Two-Way Slab

2014 ◽  
Vol 919-921 ◽  
pp. 68-71
Author(s):  
Shu Zhi Liu
Keyword(s):  
Reinforced Concrete ◽  
Calculation Method ◽  
Plasticity Theory ◽  
Theory Analysis ◽  
Methods Of Calculation ◽  
Rectangular Slab ◽  
Simplified Calculation ◽  
Simplified Calculation Method

We analyzed the rectangular slab with four sides supported, respectively elastic and plastic methods of calculation the slab. Generally considered l2/l1≤2 calculated as the two-way slab, 2< l2/l1<3 should be calculated as the two -way slab, however l2/l1≥3 calculated as one-way slab, consider these provisions is not reasonable, analysis shows, if using elastic or plasticity theory analysis, l2/l1 <3, or l2/l1 <4 as the two-way slab. Otherwise, it is one-way slab. Reasonable distinction between one-way slab and two-way slab are meaningful, not only simplifies the calculation, but also makes the design economical, safe and reliable.

The Study on Implified Calculation of Cracking Torque of Steel Reinforced Concrete Combined Force

2010 ◽  
Vol 163-167 ◽  
pp. 1673-1677
Author(s):  
Ji Ming Liu ◽  
Fei Zhou ◽  
Jie Zheng ◽  
Xiang Yang Xing
Keyword(s):  
Reinforced Concrete ◽  
Calculation Method ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Steel Reinforced Concrete ◽  
Simplified Calculation ◽  
Simplified Formula ◽  
Simplified Calculation Method

Based on a steel reinforced concrete composite post crack under the torque simplified calculation method was studied. Using the simplified formula derived for H steel reinforced concrete structures under the action of compound and cracking torque is calculated. And simplify the calculation compared with the experimental value. The result is calculated with the testing results.

scholarly journals An integrated multi-energy flow calculation method for electricity-gas-thermal integrated energy systems

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Mengting Zhu ◽  
Chengsi Xu ◽  
Shufeng Dong ◽  
Kunjie Tang ◽  
Chenghong Gu
Keyword(s):  
Calculation Method ◽  
Energy Flow ◽  
Energy System ◽  
Calculation Model ◽  
Flow Calculation ◽  
Gas Network ◽  
Integrated Energy Systems ◽  
Unit Value ◽  
Integrated Energy System ◽  
Simplified Calculation

AbstractThe modeling and multi-energy flow calculation of an integrated energy system (IES) are the bases of its operation and planning. This paper establishes the models of various energy sub-systems and the coupling equipment for an electricity-gas-thermal IES, and an integrated multi-energy flow calculation model of the IES is constructed. A simplified calculation method for the compressor model in a natural gas network, one which is not included in a loop and works in constant compression ratio mode, is also proposed based on the concept of model reduction. In addition, a numerical conversion method for dealing with the conflict between nominal value and per unit value in the multi-energy flow calculation of IES is described. A case study is given to verify the correctness and speed of the proposed method, and the electricity-gas-thermal coupling interaction characteristics among sub-systems are studied.

scholarly journals A note on the earthquake performance of reinforced concrete shear walls

1969 ◽  
Vol 2 (2) ◽  
pp. 193-198
Author(s):  
Karl V. Steinbrugge ◽  
Henry J. Degenkolb
Keyword(s):  
Reinforced Concrete ◽  
Shear Walls ◽  
The United States ◽  
Concrete Walls ◽  
Reinforced Concrete Walls ◽  
Structural Panel ◽  
Earthquake Performance ◽  
Seismic Loadings ◽  
Strength And Stiffness ◽  
Seismic Forces

A great many one and two story buildings as well as many buildings as tall as 10 stories or higher have cast in situ reinforced concrete walls designed to act as shear walls for resisting seismic forces. Allowable design stresses in reinforced concrete shear walls have been increased in recent years in many building codes, although in one major code they have been drastically reduced. Concurrently, modern architectural trends have often resulted in the reduction of certain reserve strength features neglected in seismic design such as "non-structural" panel walls of brick or of reinforced concrete since these elements are often replaced by glass or by insulated metal panels. This, in effect, results in greater applied seismic forces on the shear walls. The frequent elimination of deep spandrel beams in favor of thin slabs which may meet glass or metal walls also tends to increase stresses in the shear walls since the strength and stiffness of the spandrels were often neglected when interior shear walls existed. In summary, it has been the experience in the United States and in many other countries in the world that the effective factor of safety in reinforced concrete shear walled structures has often been substantially reduced for seismic loadings. In many cases, inadequate methods of analysis have neglected critical stresses at boundaries and openings.

scholarly journals Research on Seismic Test and Calculation Model for Improving Factor of Composite Board with Heat Preservation Function

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Shaochun Ma ◽  
Hongyuan Fang
Keyword(s):  
Thermal Insulation ◽  
Calculation Method ◽  
Composite Plate ◽  
Composite Plates ◽  
Calculation Model ◽  
Computational Effort ◽  
Experimental Investigations ◽  
Composition Structure ◽  
Simplified Calculation ◽  
Simplified Calculation Method

Since the composition and stress state of thermal-insulation composite plates are extremely complex, it is difficult to conduct calculation using conventional methods. Further calculation on its composition structure is even more difficult. To settle this difficulty, this paper conducted experimental investigations on thermal-insulation composite plate and conventional composite plates, and a simplified calculation method with improved factors was deduced based on the experimental results. In this study, the influence of nonstructural thermal insulation system on the composite plate was specially considered. The calculated expressions are deduced, while the stiffness and damping (properties) are determined. Case analysis was carried out to validate the reliability and accuracy of the simplified calculation method of improvement factor. The research results indicate that the modeling difficulty and computational effort are greatly reduced, with relatively small errors. Hence, it is beneficial to the calculation and analysis of composite plates and global structures.

A Calculation Model for High Rise Frame-Shear Wall Load Bearing Skeleton Structures

2014 ◽  
Vol 935 ◽  
pp. 259-264
Author(s):  
Xue Chen Lei ◽  
Lang Wu ◽  
Jing Wu
Keyword(s):  
Calculation Method ◽  
Residential Buildings ◽  
Residential Building ◽  
Shear Wall ◽  
Calculation Model ◽  
Load Bearing ◽  
Numerical Example ◽  
High Rise ◽  
Simplified Calculation ◽  
Skeleton Structure

The Skeleton-Infill residential building system has its particular advantages in building industrialization. In order to utilize this building type into high rise residential buildings, this paper proposes a calculation model for the frame-shear wall load bearing skeleton structure with limited floor stiffness. A simplified calculation method adopting ODEs is also demonstrated. A numerical example is proceeded to verify the effectiveness and accuracy of this methodology.

EXPERIMENTAL STUDIES OF REINFORCED CONCRETE STRUCTURES WITH CROSS-SHAPED SPATIAL CRACK UNDER TORSION WITH BENDING

2020 ◽  
Vol 92 (6) ◽  
pp. 13-25
Author(s):  
Vl.I. KOLCHUNOV ◽  
◽  
A.I. DEMYANOV ◽  
M.M. MIHAILOV ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Experimental Determination ◽  
Calculation Method ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Design Parameters ◽  
Reinforced Concrete Structures ◽  
Experimental Scheme

The article offers a method and program for experimental studies of reinforced concrete structures with cross-shaped spatial crack under torsion with bending, the main purpose of which is to check the design assumptions and experimental determination of the design parameters of the proposed calculation method. The conducted experimental studies provide an opportunity to test the proposed calculation apparatus and clarify the regularities for determining deflections, angles of rotation of extreme sections, and stresses in the compressed zone of concrete. For analysis, the article presents a typical experimental scheme for the formation and development of cracks in the form of a sweep, as well as characteristic graphs of the dependence of the angles of rotation of end sections.

Study of Seismic Design Method for Slope Supporting Structure of Soil Nailing

2013 ◽  
Vol 353-356 ◽  
pp. 2073-2078
Author(s):  
Tian Zhong Ma ◽  
Yan Peng Zhu ◽  
Chun Jing Lai ◽  
De Ju Meng
Keyword(s):  
Seismic Design ◽  
Calculation Method ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Calculation Model ◽  
Soil Nailing ◽  
Case Record ◽  
Analysis And Design ◽  
Supporting Structure ◽  
Earthquake Action

Slope anchorage structure of soil nail is a kind of economic and effective flexible slope supporting structure. This structure at present is widely used in China. The supporting structure belong to permanent slope anchorage structure, so the design must consider earthquake action. Its methods of dynamical analysis and seismic design can not be found for the time being. The seismic design theory and method of traditional rigidity retaining wall have not competent for this new type of flexible supporting structure analysis and design. Because the acceleration along the slope height has amplification effect under horizontal earthquake action, errors should be induced in calculating earthquake earth pressure using the constant acceleration along the slope height. Considering the linear change of the acceleration along the slope height and unstable soil with the fortification intensity the influence of the peak acceleration, the earthquake earth pressure calculation formula is deduced. The soil nailing slope anchorage structure seismic dynamic calculation model is established and the analytical solutions are obtained. The seismic design and calculation method are given. Finally this method is applied to a case record for illustration of its capability. The results show that soil nailing slope anchorage structure has good aseismic performance, the calculation method of soil nailing slope anchorage structure seismic design is simple, practical, effective. The calculation model provides theory basis for the soil nailing slope anchorage structure of seismic design. Key words: soil nailing; slope; earthquake action; seismic design;

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