9—demolition of concrete structures by heat

... determined by either Trang 16 Nilson-Darwin-Dotan: J, = moment of inertia of gross section of column, int E, = modulus of elasticity of steel = 29,000,000 psi 1, = moment of inertia of reinforcement ... the moment diagram of Fig 9.84 It is seen that the maximum values of M,, both positive and negative, and the maximum values of the additional Trang 10296 DESIGN OF CONCRETE STRUCTURES Chapter ... or less of that aiven by Eq (8:3) In this case, collapse is caused by buckling, ie by sudden lateral displacement of the member between its ends, with consequent overstre and conerete by the bending

Ngày tải lên: 05/05/2018, 09:16

... reserved Printed in The United States of America The contents or parts thereof may be reproduced for use with DESIGN OF CONCRETE STRUCTURES Twelfth Edition by Arthur H Nilson provided such reproductions ... Trang 2tm ra " A Division of The McGraw Hill Companies a ` Solutions Manual to Accompany DESIGN OF CONCRETE STRUCTURES Tvefth Edition Copyright © 1997 by The McGraw-Hill Companies, Inc ... provided in response to numerous requests from college teachers using the textbook DESIGN OF CONCRETE STRUCTURES by Nilson (McGraw-Hill Inc, New York, 1997) I make these solutions available with some

Ngày tải lên: 01/05/2014, 21:25

... modulus of elasticity of concrete Ecd Design value of modulus of elasticity of concrete Ecm Secant modulus of elasticity of concrete Ec(t) Tangent modulus of elasticity of normal weight concrete ... 1: Actions on structures EN 1992 Eurocode 2: Design of concrete structures EN 1993 Eurocode 3: Design of steel structures EN 1994 Eurocode 4: Design of composite steel and concrete structures EN ... strength of concrete at 28 days fcm Mean value of concrete cylinder compressive strength fctk Characteristic axial tensile strength of concrete fctm Mean value of axial tensile strength of concrete

Ngày tải lên: 05/05/2018, 08:38

... Design of concrete structures — Part 1-5: Unbonded and external prestressing tendons. ENV 1992-1-6:1994, Eurocode 2: Design of concrete structures — Part 1-6: General rules — Plain concrete structures. ... 2: Design of concrete structures — Part 1-1: General rules and rules for buildings. ENV 1992-1-3:1994, Eurocode 2: Design of concrete structures — Part 1-3: General rules — Precast concrete ... 1992-1-2:1995, Eurocode 2: Design of concrete structures — Part 1-2: General rules — Structural fire design. ENV 1992-3:1998, Eurocode 2: Design of concrete structures — Part 3: Concrete foundations. Trang

Ngày tải lên: 05/05/2018, 08:38

... prepared by Subcommittee B/525/9 and is theEnglish language version of ENV 1999-1-2:1998 Eurocode 9: Design of aluminiumstructures Part 1-2: General rules - structural fire design, as published by ... 1999-1-2:1998 results from a programme of work sponsored by the EuropeanCommission to make available a common set of rules for the structural andgeotechnical design of building and civil engineering ... form of BuildingRegulations, and in particular Approved Document B (1992 edition) of thoseregulations There are no current British Standards that give a method of calculatingfire resistance of

Ngày tải lên: 05/05/2018, 08:41

... the official English version of ENV 1999-1-1:1998. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of ... its three-year life The commencement of the review period will be notified by an announcement in Update Standards. According to the replies received by the end of the review period, the responsible ... Standard A review of this publication will be initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its three-year life

Ngày tải lên: 05/05/2018, 08:41

... the official English version of ENV 1999-1-1:1998 This publication is not to be regarded as a British Standard It is being issued in the Draft for Development series of publications and is of ... three-year life The commencement of the review period will be notified by an announcement in Update Standards According to the replies received by the end of the review period, the responsible ... Standard A review of this publication will be initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its three-year life

Ngày tải lên: 05/05/2018, 08:41

... steels and concretes of very high strength in combination This type of construction is known as prestressed concrete ‘The steel, in the form of wires, strands, or bars, is embedded in the concrete ... such structures, and thereby enables these high-strength materials to be used effectively Prestressed concrete has extended, to a very significant extent, the range of spans of structural concrete ... ribs supported by monolithic ‘concrete beams; transverse ribs provide for lateral Where long clear spans are required for roofs, concrete shells permit use of extremely thin surfaces, often thinner,

Ngày tải lên: 05/05/2018, 09:16

... proportions of a concrete mix in terms of the total weight of each component needed to make up 1 yd* of wet concrete, such as $17 Ib of, cement, 300 Ib of water, 1270 Ib of sand, and 1940 Ib of coarse ... it dries For complete hydration of a given amount of cement, an amount of water equal to about 25 percent of that of cement, by weight—i.e., a water-cement ratio of 0.25— is needed chemically An ... the aid of chemical admixtures ‘The so-called ACI method of proportioning makes use of the slump test in con- nection with a set of tables that, for a variety of conditions (types of structures,

Ngày tải lên: 05/05/2018, 09:16

... Trang 11DESIGN OF CONCRETE STRUCTURES | Chapter 3 (Ref 3.4) In addition to these two criteria (yielding of the steel at a stress of f, and crushing of the concrete at a strain of 0.003), itis ... protection of the steal In such a reinforced concrete beam, the tension caused by the bending moments is chiefly Trang 4by special anchorage of the ends of the bars A simple example of such a ... will be by yielding of the steel, not by crush- ing of the concrete This can be done, theoretically, by requiring that the reinforcement ratio be less than the balance ratio -, given by Eq (3.28)

Ngày tải lên: 05/05/2018, 09:16

... because of greater uncertainty in predicting certain other modes of collapse, or because of the catastrophic nature of some other types of failure, should they occur Shear failure of reinforced concrete, ... beam is supported by a girder of similar depth (Fig 4.12e) or at the end of a monolithic vertical element (Fig 4.12/)] Trang 19DESIGN OF CONCRETE STRUCTURES | Chapter 4 uncracked concrete) is basically ... supported by columns: (6) concentrated load within dof the face of the support: (a) member loaded near the bottom: (¢) beam supported by girder of similar depth: (7) beam supported by monolithic

Ngày tải lên: 05/05/2018, 09:16

... beam with Tittle oF no bond Concrete Reinforcing bar (a) End slip, P by bond, as indicated by Fig 5.3 Trang 4 Sites Thirteenth tion 166 DESIGN OF CONCRETE STRUCTURES Chapter ... appears in the denominator of those equations and reflects the influence of concrete tensile strength Trang 8170 Structures, Thirtoonth Edition DESIGN OF CONCRETE STRUCTURES | Chapter 5 As ... excess of that required by analysis Ay required ‘A, needed of the hook past the column face, and specify the hook details, Trang 18 Structures, Thiteonth Ediion 180 DESIGN OF CONCRETE STRUCTURES

Ngày tải lên: 05/05/2018, 09:16

... further, although the number of cracks is more or less stable Cracking of concrete is a random process, highly variable and influenced by many factors Because of the complexity of the problem, present ... calculated by using an effective moment of inertia J,: that is, and J,, is the moment of inertia of the cracked transformed section, In Fig 6.4, the effective moment of inertia, given by Eq (6.5), ... used, include all of the factors just named as having an important influence on the width of cracks: steal stress, concrete cover, and the distribution of the reinforeement in the concrete tensile

Ngày tải lên: 05/05/2018, 09:16

... enclosed by the outside perimeter of the concrete section After torsional cracking, the applied torque is resisted by the portion of the sec- tion represented by A,,,, the area enclosed by the ... where A, = area of one leg of a closed stirrup fry = yield strength of transverse reinforcement ‘n= number of stirrups intercepted by torsional crack Since the horizontal projection of the crack ... provided by the square root of the sum of the squares of the nominal shear stresses: Y — + bd 1.743, (7.9) Equations (7.8) and (7.9) serve as a measure of the shear stres: the concrete

Ngày tải lên: 05/05/2018, 09:16

... Confinement of core concrete due to hoop tension, Companies, 204 A volumetric ratio core concrete: s defined as the ratio of the volume of spiral steel to the volume of To find the right amount of ... sive strength of the core concrete in a column provided through the confining effect of spiral steel is closely represented by the equation e strength of spirally confined core concrete = compressive ... concrete = compressive strength of concrete if unconfined lateral confinement stress in core concrete produced by spiral d, = outside diameter of spiral š = spacing or pitch of spiral wire Trang 7

Ngày tải lên: 05/05/2018, 09:16

... effective compressive strength of concrete 0.85/7 is modified by a factor - to account for the effects of cracks (caused by spreading Trang 12DESIGN OF CONCRETE STRUCTURES | Chapter 10 compressive ... The dimension of one side of a nodal zone is often determined based on the contact area of the load, for example by a bearing plate, column base, or beam sup- port The dimensions of the remaining ... Thirteenth tion 330 DESIGN OF CONCRETE STRUCTURES Chapter 10 e Capacity of Struts Strut capacity is based on both the strength of the strut itself and the strength of the nodal zone If a strut

Ngày tải lên: 05/05/2018, 09:16

... vibration of the ‘concrete are practical In this case, bar layout is simplified by making the column 4 in, wider than the beams Column steel is placed with the usual 1.5 in of concrete outside of the ... Figure 11.1 illustrates the congestion of reinforcing bars at such Trang 2 Sites Thirteenth tion 348 DESIGN OF CONCRETE STRUCTURES Chapter 11 an intersection Concrete placement in such a region ... provided by the ACI Code, the ACI-ASCE Committee 352 report Recommendations for Design of Beam- Column Joints in Monolithic Reinforced Concrete Structures (Ref 11.6) provides a basis for the design of

Ngày tải lên: 05/05/2018, 09:16

... book: Unified Theory of Concrete Structures, a giant step beyond the scope of Unified Theory of Reinforced Concrete The many challenging goals of this new book are made possible only by the collaboration ... of Concrete Structures The position of the unified theory in the scheme of structural engineering is shown in row of Table 1.1 The six model components of the unified theory are distinguished by ... study the damages in concrete structures, to assess causes and to recommend rehabilitation and future research Professor Mo is the author of the book “Dynamic Behavior of Concrete Structures (1994)...

Ngày tải lên: 07/06/2014, 00:49

... characteristics of a button head are influenced by the wire cutoff method, the type of heading equipment, the geometric characteristics of the head, the properties of the seating block, and the type of wire ... of the Fatigue Behavior of Concrete, Mortar, and Paste in Uniaxial Compression,” ACI JOURNAL, Proceedings V 67, No 6, June 1970, pp 461-463 11 Nordby, Gene M., “Fatigue of Concrete- A Review of ... “Effect of Component Elements of Deformation Patterns on the Fatigue Strength of Bar Reinforcement,” Experimental and Theoretical Investigations of Reinforced Concrete Structures, edited by A.A...

Ngày tải lên: 24/10/2014, 15:46

... Survey of Concrete in Service 228.1R In-Place Methods for Determination of Strength of Concrete EVALUATION OF STRUCTURES PRIOR TO REHABlLlTATlON 437R B-14 SP-85 Strength Evaluation of Existing Concrete ... Reinforced Concrete Structures, ” DA-24 Concrete Society, 1982, “Non-Structural Cracks in Concrete, ” Technical Report No 22, England Corps of Engineers, 1986, “Evaluation and Repair of Concrete Structures, ” ... shear stresses n concrete Low level of expertise required, can be used by field personnel Directly measures inplace strength of concrete; appears to give good prediction of concrete strength...

Ngày tải lên: 24/10/2014, 21:59