6—high performance lightweight concrete p 213r 30
guide for structural lightweight-aggregate concrete
... 6—High- performance lightweight concrete, p 213R- 30 6.1—Scope and historical developments 6.2—Structural efficiency of lightweight concrete 6.3—Applications of high -performance lightweight concrete 6.4—Reduced ... In proportioning lightweight concrete mixtures, these properties may be optimized Some properties are interdependent, and improvement in one property, such as workability, may affect other properties ... 2.2—Production of lightweight aggregates 2.3—Aggregate properties Chapter 3—Proportioning, mixing, and handling, p 213R- 8 3.1—Scope 3.2—Mixture proportioning criteria 3.3—Materials 3.4—Proportioning...
Ngày tải lên: 24/10/2014, 15:47
recent approaches to shear design of structural concrete
... constant stirrup spacing s, and effective depth d The truss resistance is supplemented with a concrete contribution Vc for both reinforced and prestressed concrete beams Appendix A presents the ... the relationship between the principal compressive stress f2 and the principal RECENT APPROACHES TO SHEAR DESIGN OF STRUCTURAL CONCRETE compressive strain ε2 for diagonally cracked concrete would ... this complexity and the importance of developing physical models to explain this behavior The existing mechanical or physical models are presented in Chapter Despite differences in the approaches,...
Ngày tải lên: 24/10/2014, 17:26
Workability and stability of lightweight aggregate concrete from rheology perspective
... critical to completely define concrete flow when special concretes, such as selfcompacting concrete (SCC) or high performance concrete (HPC), are used or when concrete is placed in highly-reinforced ... commonly known as superplasticizer Superplasticizers are used to improve flowability and homogeneity of fresh concrete and to produce high performance concretes It enables dispersion of cement ... (left) compared with entrapped air bubbles (right) 94 Fig.4.16 – Slump of air entrained (plastic viscosity was about 19 Pa s) and non-air entrained (plastic viscosity was about 53 Pa s) concrete...
Ngày tải lên: 16/09/2015, 08:30
Penetrability of lightweight aggregate concrete
... grade (30MPa, 40MPa, 50MPa, 60MPa and 80MPa) 21 Scope of work (flowchart) Penetrability of lightweight aggregate concrete Recycled aggregate concrete (30MPa, 40MPa, 50MPa, 60MPa and 80MPa) Normal ... Chloride penetration depth for Concrete type versus pressure (MPa) 102 Figure 4.7: 28-day chloride profile test at 30MPa and 30 C 104 Figure 4.8: 84-day chloride profile test at 0.1 MPa and at 30 C ... concrete (RAC), where penetrability of concrete is attributed primarily to permeability, diffusion, and sorption of fluids in concrete LWA properties that may potentially impact the overall concrete...
Ngày tải lên: 13/10/2015, 15:55
analysis and design of reinforced and prestressed-concrete guideway structures
... initial prestress, psi (MPa) Cracking stress of concrete, psi (MPa) Cracking stress of concrete at the time of initial prestress, psi (MPa) c = Square root of specified compressive ffr = fm = fpu ... supplemental traction and power devices The specialty transit supplier should provide the engineer with explicit specifications of special equipments and their spatial restrictions For example, ... anchor, ksi (MPa) Extreme fiber compressive stress in concrete at service loads, psi (MPa) Specified compressive strength of concrete at 28 days, psi (MPa) Compressive strength of concrete at time...
Ngày tải lên: 24/10/2014, 21:58
Design of modern highrise reinforced concrete structures hiroyuki aoyama
... 9.1.2.1 OP200 Straight Type 407 9.1.2.2 OP300 Straight Type 408 xviii Contents 9.1.2.3 OP300 Tapered Type 9.1.2.4 BR200 K-brace Type 9.1.2.5 BR200 D-brace Type 9.1.2.6 BR300 X-brace Type 9.1.2.7 ... of applicants are construction companies A few design firms have so far applied by forming a team with construction companies, or by preparing elaborate construction specifications to be applied ... the current practice On one extreme end are buildings with all members cast-in-place A popular and modest application is to use precast concrete formwork for composite floor slabs Upper half of...
Ngày tải lên: 27/04/2016, 23:02
guide for the use of preplaced aggregate concrete for structural and mass concrete applications
... in ASTM C 939) PREPLACED AGGREGATE CONCRETE Fig 8-Double-tub grout mixer and progressive cavity pump, compressed air driven Fig 9-Double-tub mixer and Simplex pump in operation Inspector, left, ... batched at the project’s concrete plant and fed to the hoppers over the mixers Mixer power requirements range from l/4 to l/t hp per ft3 (0.03 m3) of capacity The pan or turbine-type concrete mixers ... drops tramp (oversized) material over the end of the agitator Power-driven shaker screens have also been used 3.2.2 Pumps-Grout pumps must be of the positive displacement type such as piston, progressive...
Ngày tải lên: 24/10/2014, 17:44
Real-Time Digital Signal Processing - Chapter 5: Design and Implementation of FIR Filters
... lowpass filter As shown in Figure 5.2, the magnitude of passband defined by mates unity with an error of Ædp That is, À dp jH !j dp , ! !p : ! !p approxi 5:1:4 The passband ripple, dp , ... respectively 186 DESIGN AND IMPLEMENTATION OF FIR FILTERS H(w) Ap 1+d p Ideal filter 1−d p Actual filter As ds Passband p wc ws wp Transition band w Stopband Figure 5.2 Magnitude response and performance ... does not depend on the input applied after n0 It depends only on the input applied at and before n0 On the contrary, the output of a non-causal filter depends not only on the past input, but...
Ngày tải lên: 23/10/2013, 22:15
An Introduction to Intelligent and Autonomous Control-Chapter 5: Modeling and Design of Distributed Intelligence Systems
Ngày tải lên: 07/11/2013, 09:15
Tài liệu The Design of Prestressed Concrete Bridges ppt
... Abbotts Bypass: prestressed diaphragm Diaphragm action for inset bearings Diaphragm action for side-sway Forces applied by inclined webs Typical diaphragm for box girder Piped drainage in precast ... sections of slip road merging with main carriageway Options for bridge pier Options for flared column STAR Viaduct: typical pier Byker Viaduct: pier finishes Fish belly beams: simply supported beams ... on portal foundations Singapore Central Expressway Modelling of portal node Detailing of node Nodes for prestressed portals The effect of prestress parasitic moments on portals Diagram of prestressed...
Ngày tải lên: 18/02/2014, 18:20
Structural design of steel work
... Fire performance Additional design constraints Design philosophies Design issues for multi-storey structures Portal frame design 282 282 283 286 286 288 293 294 298 300 301 303 306 310 314 CHAPTER ... harmful to welders or impair the quality of the welds Welds and adjacent parent metal should not be painted prior to de-slagging, inspection and approval Encasing steel in concrete provides an alkaline ... material, called cast iron, is high in carbon, sulphur and phosphorus Steel production is a batch process and consists in reducing the carbon, sulphur and phosphorus levels and adding, where necessary,...
Ngày tải lên: 14/03/2014, 13:20
Báo cáo Y học: Monitoring the structural consequences of Phe12 fi D-Phe and Leu15 fi Aib substitution in human/rat corticotropin releasing hormone Implications for design of CRH antagonists pdf
... time-proportional phase incrementation-NOESY [19,20] spectra were acquired in the 10–14 p. p.m spectrum window using PRESATURATION [21] and WATERGATE [22] pulse sequences for H2O suppression Spectra were ... transfer spectroscopy J Magn Reson 65, 355–360 Marion, D & Wuthrich, K (1983) Application of phase sensitive ¨ two-dimensional correlated spectroscopy (COSY) for measurements of 1H-1H spin-spin coupling ... (Fig 2A) The Aib15 residue possesses two diastereotopic methyl groups, with the pro-R methyl replacing the Ha proton at Ca carbon of an L-valine and the pro-S group corresponding to the side chain...
Ngày tải lên: 17/03/2014, 10:20
Báo cáo khoa học: The structural comparison of the bacterial PepX and human DPP-IV reveals sites for the design of inhibitors of PepX activity pot
... compared, the structures of PepX and DPP-IV not show any homology except for their catalytic portion, where it is possible to superimpose only 140 Ca atoms (around 18% of PepX and DPP-IV Ca positions) ... (763 residues for PepX and 766 residues for DPP-IV), the closest structure to DPP-IV is prolyl oligopeptidase (POP; Fig 1D) [23], an endopeptidase specifically cleaving after proline residues and ... responsible for the SPAP exopeptidase activity, are not superimposable with Exo1 or Exo2 subsites Label PepX (family S15) DPP-IV (family S9B) POP (family S9A) Catalytic triad Ser S348 S 630 Asp...
Ngày tải lên: 23/03/2014, 13:20
design of reinforced concrete structure volume 1 DR mashhour a ghoneim
Ngày tải lên: 23/03/2014, 20:34
Steel concrete and composite design of tall bulding - bungale s taranath
Ngày tải lên: 12/05/2014, 23:57
Steel concrete and composite design of tall bulding - bungale s.taranath
Ngày tải lên: 13/05/2014, 03:01
Principles of structural design
... application p 3.05(1 À 1.54Pu=fbPy) (E=Fy) for seismic application p 1.40= (E=Fy) p 5.70(1 À 0.74Pu=fbPy) (E=Fy) For Pu=fbPy > 0.125: p 1.12(2.33 À Pu=fbPy) (E=Fy) ! p 1.49 (E=Fy) fb ¼ 0.90 Pu ¼ factored ... strength p 0.939 (E=Fy) for plastic analysis p 3.76 (E=Fy) for nonseismic application p 3.05 (E=Fy) for seismic application For Pu=fbPy 0.125: p 3.76(1 À 2.75Pu=fbPy) (E=Fy) for nonseismic application ... ! l À lp fb Mn ¼ fb Mn ¼ 0:90 Mp À ðMp À Mr Þ lr À lp ð1:43Þ Lp (flange or web ð1:44Þ where Lp Mp À Mn ¼ Lp þ ðLr À Lp Þ Mp À Mr ð1:45Þ Lp, Lr, Mp, Mr are defined as before for compact section...
Ngày tải lên: 28/05/2014, 20:09