Torsional motion of buildings during earthquakes. I. Elastic response

1998 ◽  
Vol 25 (5) ◽  
pp. 898-916 ◽  
Author(s):  
J L Humar ◽  
P Kumar
Keyword(s):  
Good Practice ◽  
The Other ◽  
Elastic Response ◽  
Earthquake Response ◽  
Torsional Motion ◽  
Torsional Response ◽  
A Value ◽  
Earthquake Motion ◽  
Building Models ◽  
Storey Building

Analytical studies are carried out on the elastic torsional response of single- and multi-storey building models subjected to earthquake motion. Effects of both the natural and accidental torsion are considered. The results of analysis are compared with the design provisions of the National Building Code of Canada (NBCC). It is shown that the NBCC provisions for the design of resisting elements on the flexible side are overly conservative. On the other hand, provisions for the design of elements on the stiff side are conservative in some situations and inadequate in others. Modifications to the design provisions are suggested which give design forces closer to the results obtained from a dynamic analysis, and are at the same time simpler than the existing provisions. It is shown that the ratio of the uncoupled torsional and translational frequencies is an important parameter governing the torsional response and it would be a good practice in design to achieve a value greater than 1 for this ratio.Key words: earthquake response, natural torsion, accidental torsion, elastic torsional response, design for torsion.

Torsional motion of buildings during earthquakes. II. Inelastic response

1998 ◽  
Vol 25 (5) ◽  
pp. 917-934 ◽  
Author(s):  
J L Humar ◽  
P Kumar
Keyword(s):  
Building Code ◽  
Elastic Response ◽  
Earthquake Response ◽  
Torsional Motion ◽  
Inelastic Response ◽  
Torsional Response ◽  
Earthquake Motion ◽  
Building Models ◽  
Edge Based

In a previous study on the elastic torsional response of building models subjected to earthquake motion, it was shown that the current provisions of the National Building Code of Canada for design against torsion induced by earthquakes are quite conservative for the flexible edge of the building, but may be inadequate for the stiff edge. Based on the results of studies on the elastic response, a new set of design provisions was suggested. The present study deals with the inelastic torsional response of single- and multi-storey buildings designed according to the suggested provisions. Effects of both the natural and the accidental torsion are considered. It is shown that, given the complexity of inelastic response, particularly that of multistorey buildings, the suggested provisions can reasonably be used for the torsion design of single-storey buildings, as well as of multistorey buildings that are asymmetric in plan, but otherwise fairly regular.Key words: earthquake response, natural torsion, accidental torsion, inelastic torsional response, design for torsion.

Dynamic response of buildings to ground rotational motion

1984 ◽  
Vol 11 (1) ◽  
pp. 48-56 ◽  
Author(s):  
A. M. Awad ◽  
J. L. Humar
Keyword(s):  
Dynamic Response ◽  
Rotational Motion ◽  
Translational Motion ◽  
Torsional Motion ◽  
Rotational Component ◽  
Torsional Response ◽  
Building Model ◽  
Earthquake Motion ◽  
Earthquake Force ◽  
Storey Building

Torsional motion in a building subjected to earthquake force is often attributed to an eccentricity between the centres of mass and resistance of the building. However, a more direct cause of torsional response is the presence of a rotational component in the earthquake motion. The effect of such a rotational motion on the response of both a symmetric and an unsymmetric single storey building model is studied. It is shown that the rotational component of excitation may have a very significant effect on the response, and that this effect may at times be more pronounced than the effect of torsion resulting from translational motion combined with plan eccentricity.

The effect of element strength assignment on the torsional response of stiffness-eccentric systems

2013 ◽  
Vol 40 (7) ◽  
pp. 655-662
Author(s):  
George K. Georgoussis
Keyword(s):  
Structural Design ◽  
Shear Force ◽  
Ground Motions ◽  
Building Structures ◽  
Centre Of Mass ◽  
Base Shear ◽  
Structural Behaviour ◽  
Torsional Response ◽  
Building Models ◽  
Storey Building

Building structures of low or medium height are usually designed with a pseudostatic approach using a base shear much lower than that predicted from an elastic spectrum. Given this shear force, the objective of this paper is to evaluate the effect of the element strength assignment (as determined by several building codes) on the torsional response of inelastic single-storey eccentric structures and to provide guidelines for minimizing this structural behaviour. It is demonstrated that the expected torque about the centre of mass (CM) may be, with equal probability, positive (counterclockwise) or negative (clockwise). This result means that the torsional strength should also be provided in equal terms in both rotational directions, and therefore the base shear and torque (BST) surface of a given system must be symmetrical (or approximately symmetrical). In stiffness-eccentric systems, appropriate BST surfaces may be obtained when a structural design is based on a pair of design eccentricities in a symmetrical order about CM, and this is shown in representative single-storey building models under characteristic ground motions.

From Scarcity to Abundance: Achieving Quality-Assured Mass Higher Education

2011 ◽  
Vol 15 (2) ◽  
Author(s):  
Peter P. Smith
Keyword(s):  
Higher Education ◽  
Knowledge Economy ◽  
Good Practice ◽  
The United States ◽  
The Other ◽  
Secondary System ◽  
Mass Higher Education ◽  
Post Secondary ◽  
One Year ◽  
The One

The United States is in a bind. On the one hand, we need millions of additional citizens with at least one year of successful post-secondary experience to adapt to the knowledge economy. Both the Gates and Lumina Foundations, and our President, have championed this goal in different ways. On the other hand, we have a post-secondary system that is trapped between rising costs and stagnant effectiveness, seemingly unable to respond effectively to this challenge. This paper analyzes several aspects of this problem, describes changes in the society that create the basis for solutions, and offers several examples from Kaplan University of emerging practice that suggests what good practice might look like in a world where quality-assured mass higher education is the norm.

Effect of Catfish Bone Paste on the Properties of Steamed Bread

2014 ◽  
Vol 881-883 ◽  
pp. 757-760
Author(s):  
Xiao Qing Ren ◽  
Li Zhen Ma ◽  
Xin Yi He
Keyword(s):  
Weight Loss ◽  
Specific Volume ◽  
Cell Structure ◽  
The Other ◽  
Gas Cell ◽  
A Value ◽  
Crumb Structure ◽  
Steamed Bread ◽  
Different Levels ◽  
Structure Properties

The objective of this study was to examine the effect of different levels of catfish bone paste to flour on the physicochemical, textural and crumb structure properties of steamed bread. Six different levels (0, 1, 3, 5, 7,10 %) of catfish bone paste to flour were used in the formulation of the steamed bread. The results showed that the weight loss and TTA of steamed bread decreased with an increase in the levels of the catfish bone paste. On the other hand, the pH increased with an increase in the levels of the catfish bone paste. The specific volume, hardness, chewiness and gas cell structure in the crumb of steamed bread with catfish bone paste at 5% supplementation level were better. Thus, a value of 5% catfish bone paste was considered a better level for incorporation into the steamed bread.

The Transferable Vote: A Hundred Years of Anglican Experience

2019 ◽  
Vol 21 (3) ◽  
pp. 342-355
Author(s):  
Colin Buchanan
Keyword(s):  
Good Practice ◽  
The Other ◽  
Blind Person ◽  
Single Transferable Vote ◽  
Other Hand ◽  
The Church

I am grateful to the Society for the opportunity to mark the centenary of the Enabling Act and the beginning of the Church Assembly with some reflection on an often ignored but highly valuable feature of that inauguration: the Single Transferable Vote or STV. I tried on one respected registrar recently an illustration of what the task must be like for those who do not welcome it. Was it, I suggested, like a blind person doing a jigsaw where the pieces were all shaped differently from each other – in other words, where the blind person could ensure that it was put together accurately, but on the other hand never saw the picture? The response was that that picture reflected accurately how it had in fact felt to that registrar. That might suggest that this lecture should be explaining and commending STV as general good practice, but in the event the process and virtues of STV have here to be largely taken for granted. I offer here one short commendation of STV.

Effects of Light on Schooling and Feeding of Jack Mackerel, Trachurus symmetricus

1968 ◽  
Vol 25 (2) ◽  
pp. 393-407 ◽  
Author(s):  
John R. Hunter
Keyword(s):  
Motion Picture ◽  
Nearest Neighbor ◽  
Motion Pictures ◽  
Separation Distance ◽  
The Other ◽  
Angular Deviation ◽  
Jack Mackerel ◽  
A Value

Schools of six jack mackerel each were photographed with infrared film at eight levels of luminance and also in darkness. Three indices were used to measure the behavior of the school from motion pictures. Two of the indices, mean distance to nearest neighbor and mean separation distance, were measures of the distances between individuals in a school; the other, mean angular deviation, was a measure of differences in orientation between individuals. A value for each index was calculated for each motion picture frame.From 12.1 to 6 × 10−6 ft-L no differences existed in the angular deviation of the school or in the distances between fish. At 6 × 10−7 ft-L the intervals between fish were much larger than at higher levels of brightness and groups showed little uniformity in their orientation. Below 6 × 10−7 ft-L (darkness) schools were dispersed and the distributions of values of angular deviation were random.The ability of jack mackerel to feed on live adult Artemia was also tested at eight levels of luminance and in darkness. The number of Artemia eaten at 6 × 10−5 ft-L was about half of that eaten at the normal daytime level of 12.1 ft-L. Few Artemia were eaten at 6 × 10−7 ft-L and none in darkness.Comparison of these data with measurements of light in the sea indicated that jack mackerel probably would be able to maintain schools near the surface on a moonless starlit night and that they probably could feed effectively near the surface on a full moonlight night.

الأمر بالعشرة بالمعروف في القرآن الكريم وأثره على العلاقات الأسرية

2021 ◽  
pp. arabic cover-english cover
Author(s):  
علي عبد العزيز سيور
Keyword(s):  
Analytical Approach ◽  
Family Relations ◽  
Good Practice ◽  
Family Relationship ◽  
Knowledge System ◽  
The Other ◽  
Legal Text ◽  
The Family ◽  
The Relationship ◽  
Shed Light

يجيب البحث عن إشكالية تتعلق بالعلاقات الأسرية من جهة الاحتكام للأعراف في النفقة والمسكن والملبس وغيرها، مما يترتب على ذلك خلافات تفضي ببعضها إلى المحاكم، وقد تنتهي بالطلاق. وقد هدف البحث إلى : 1 ـ تقديم منظومة معرفية متعلقة بدلالات العشرة بالمعروف من أجل الإسهام في إعادة تشكيل عقلية ناضجة للزوجين تضبط العلاقة بينهما عند الخلاف. 2 ـ تسليط الضوء على أبعاد وحدود المعروف نصًا والمعروف عرفًا في الأسرة. 3 ـ التأكيد على أن العشرة بالمعروف متبادلة بين كل من الزوج والزوجة، لا يقتصر هذا التكليف على واحد دون الآخر. وقد اعتمدت المنهج الاستقرائي عبر جمع الايات القرآنية ذات الصلة وذكر أقوال المفسرين والفقهاء، والمنهج التحليلي في فهم دلالات الألفاظ وتوجيهات المفسرين، والمنهج الاستنباطي بغية الوصول إلى ضوابط جامعة تخدم الهدف العام للبحث، وانتهى البحث إلى مجموعة من النتائج والتوصيات ومنها: اعتبار العرف الذي لا يخالف نصًا شرعيًا قاعدة من القواعد المعتبرة في ضبط العلاقات بين الزوجين. بشرط أن يقع تحت قدرة الزوج وطاقته، وأن يكون مما انتشر بين الناس، وينطبق على الأسرة مثله. القرآن الكريم ـ العشرة بالمعروف – العلاقة الأسرية – الحقوق بين الزوجين – العرف وأثره بين الزوجين. Summary The research answers a problem related to family relations in terms of resorting to customs in alimony, housing, clothing, and others...which results in disputes that may lead to some of them in the courts and may end in divorce. The aim of the research was to 1 - presenting a knowledge system related to the semantics of the good-natured in order to contribute to reshaping a mature mentality of the spouses that controls the relationship between them in the event of disagreement. 2 - and to shed light on the dimensions and limits of what is textually known and what is known by convention in the family. 3 - Emphasis on that good practice is mutual. Between both husband and wife, this assignment is not limited to one without the other. The inductive approach was adopted by collecting the relevant Qur’anic verses and mentioning the sayings of the commentators and jurists, the analytical approach in understanding the semantics of the words and the directives of the interpreters, and the deductive approach in order to reach comprehensive controls that serve the general objective of the research, and the research ended with a set of results and recommendations, including: Considering the custom that does not contradict A legal text is one of the considered rules in controlling relations between spouses. Provided that it falls under the husband’s ability and energy, and that it is something that has spread among people, and applies to the family like him. The Noble Qur’an - Ten Laws - Family Relationship - Rights between spouses - Custom and its effect between spouses.

Energy Consumption in Leisure Centres – A Comparative Study

1997 ◽  
Vol 8 (3) ◽  
pp. 207-225
Author(s):  
A.J. Griffiths ◽  
P.J. Bowen ◽  
B.J. Brinkworth ◽  
I.R. Morgan ◽  
A Howarth
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Comparative Study ◽  
Energy Cost ◽  
Good Practice ◽  
The Other ◽  
Occupancy Rate ◽  
The Government ◽  
The Uk ◽  
High Band

The Sports and Recreation sector within the UK uses the equivalent of 3 millions tonnes of coal per year to supply the activities demanded by an ever increasing sports conscience society. The government has attempted to stimulate energy efficiency in this sector through the use of good practice guides and case studies. A comparative study was undertaken to analyse the performance of two leisure complexes in the Seven Valley degree day region. One site had double the occupancy rate of the other. It was found that the energy consumption per user was approximately 10 kWh for both sites. However the energy cost per user showed a large difference: for Site A this index was 31p/user compared to 15p/user at Site B. The primary causes of this difference are attributed to variation in energy mix between the two sites, as well as a difference in the price paid for primary fuel. Indices based on floor area of the facilities exhibit similar trends, and furthermore show that both sites were in the high band of energy consumption. This indicated that both sites had the potential to make significant energy-related savings, and a further breakdown of electrical, natural gas and water consumption per site is used to identify these potential savings in a rapidly expanding sector.

scholarly journals Lipid composition of the brains of she-goat and castrated goat consumed in Ekiti State, Nigeria

2015 ◽  
Vol 50 (2) ◽  
pp. 153-162 ◽  
Author(s):  
EI Adeyeye ◽  
AJ Adesina
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Linear Correlation ◽  
The Other ◽  
A Value ◽  
Significant Difference ◽  
Value Range ◽  
Goat Brain

The levels of fatty acids, phospholipids and sterols were determined in the brains of she-goat and castrated goat found in Ekiti State, Nigeria by gas chromatography. Results showed that the crude fat levels were 9.98 and 10.2 % in the brains of she-goat and castrated goat respectively. The fatty acid composition of she-goat and castrated goat brain shows that the SFA was 40.6 and 42.7 %, MUFA was 37.1 and 38.7 % and PUFA was 20.9 and 22.3% respectively. The other parameters of she-goat and castrated goat brain were found: PUFA/SFA, 0.490 and 0.548; MUFA/SFA, 0.869 and 0.953; n-6/n-3, 0.775 and 11.7; LA/ALA, 0.876 and 28.0; AA/DGLA, 6.05 and 17.4; EPA/DHA, 1.00 and 5.89 and EPSI (PUFA/MUFA), 0.564 and 0.575 respectively. Phospholipids were present in she-goat and castrated goat with a value range of 2365 and 3047 mg/100g respectively. Among the sterols, only cholesterol was of any significant level with values of 1353 mg/100g (she-goat brain) and 1355 mg/100g (castrated goat brain). Linear correlation at ? = 0.05, df: n-1 showed that no significant difference exists between the crude fats, phospholipids and sterols except in the fatty acids parameters.Bangladesh J. Sci. Ind. Res. 50(2), 153-162, 2015

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