The Constructor http://theconstructor.org Civil Engineering Home Mon, 02 Apr 2012 14:20:22 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 CONNECTIONS FOR PRECAST FLOOR SLABShttp://theconstructor.org/concrete/connections-for-precast-floor-slabs/6332/ http://theconstructor.org/concrete/connections-for-precast-floor-slabs/6332/#comments Mon, 02 Apr 2012 14:20:21 +0000 Gopal Mishra http://theconstructor.org/?p=6332 Floor slab connection essentially consists of a compression joint in the bearing surface. The bearing length should be atleast 75mm to avoid spalling of the edges. To prevent this short of failure occurring, the slab must be tied to the beam. Connections in Hollow Core Slab: The problem with hollow core slabs is that there [...]

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]]> http://theconstructor.org/concrete/connections-for-precast-floor-slabs/6332/feed/ 1 TYPES OF PRECAST COMPONENTS IN A BUILDINGhttp://theconstructor.org/concrete/types-of-precast-components-in-a-building/6325/ http://theconstructor.org/concrete/types-of-precast-components-in-a-building/6325/#comments Tue, 27 Mar 2012 15:07:42 +0000 Gopal Mishra http://theconstructor.org/?p=6325 TYPES OF PRECAST COMPONENTS IN A BUILDING: The figure below shows the basic precast structure. The numbers of different types of components in these structures over the years have become very large. But following figure shows the major types of precast components in a building. Precast Beams: There are two main categories of beams: Internal [...]

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]]> http://theconstructor.org/concrete/types-of-precast-components-in-a-building/6325/feed/ 4 PERMANENT FORMWORK METHOD FOR BEAM CONSTRUCTIONhttp://theconstructor.org/concrete/permanent-formwork-construction-method/6312/ http://theconstructor.org/concrete/permanent-formwork-construction-method/6312/#comments Tue, 27 Mar 2012 14:12:07 +0000 Gopal Mishra http://theconstructor.org/?p=6312 Permanent formwork construction method is used to: Speed construction, especially of downstand beams Provide high-quality finishes Promote low tolerances The units can act solely as permanent formwork, i.e. they may be designed for construction loads only without contributing to the strength of the completed beams. More efficiently, they can act compositely with the in-situ concrete. [...]

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]]> http://theconstructor.org/concrete/permanent-formwork-construction-method/6312/feed/ 0 HYBRID CONSTRUCTION TECHNIQUE AND STRUCTURAL ACTIONShttp://theconstructor.org/concrete/hybrid-construction-technique-and-structural-actions/6305/ http://theconstructor.org/concrete/hybrid-construction-technique-and-structural-actions/6305/#comments Mon, 26 Mar 2012 15:29:11 +0000 Gopal Mishra http://theconstructor.org/?p=6305 HYBRID CONSTRUCTION TECHNIQUE: Hybrid concrete construction is the combination of precast and in-situ concrete. The different materials are used according to their strengths and weaknesses to provide simple, buildable and competitive high-quality structures that offer consistent performance. Hybrid concrete construction can incorporate all the benefits of precasting, (e.g. form, finish, colour, speed, accuracy, prestressing, high-quality, [...]

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]]> http://theconstructor.org/concrete/hybrid-construction-technique-and-structural-actions/6305/feed/ 1 TYPES OF PRECAST FRAMEShttp://theconstructor.org/concrete/types-of-precast-frames/6300/ http://theconstructor.org/concrete/types-of-precast-frames/6300/#comments Mon, 26 Mar 2012 14:59:11 +0000 Gopal Mishra http://theconstructor.org/?p=6300 TYPES OF PRECAST FRAMES Consider the following in-situ frame and its bending moment diagrams. It can be seen from the diagrams above that the joints in the precast frame are made at positions of minimum bending moment. Skeletal Frame: The correct position for the skeletal frame joint is shown below. However for the ease of [...]

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]]> http://theconstructor.org/concrete/types-of-precast-frames/6300/feed/ 0 STRUCTURAL USES OF PRECAST CONCRETEhttp://theconstructor.org/concrete/structural-uses-of-precast-concrete/6289/ http://theconstructor.org/concrete/structural-uses-of-precast-concrete/6289/#comments Sun, 25 Mar 2012 16:01:48 +0000 Gopal Mishra http://theconstructor.org/?p=6289 Precast concrete is used extensively in building structures, for e.g. structural frames, floors and roofs, claddings etc. Use of Precast Concrete in frames: There are two main types of precast building frame. The structural frame consists of slabs, beams and columns. Structural frames are mainly used for offices, car parks and retail developments. The cross-wall [...]

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]]> http://theconstructor.org/concrete/structural-uses-of-precast-concrete/6289/feed/ 0 FEATURES OF PRECAST CONCRETEhttp://theconstructor.org/concrete/features-of-precast-concrete/6281/ http://theconstructor.org/concrete/features-of-precast-concrete/6281/#comments Sun, 25 Mar 2012 14:24:46 +0000 Gopal Mishra http://theconstructor.org/?p=6281 Because precast concrete can be cast at ground level in factory conditions, it has these added features: Better Finishes: Better finishes can be obtained with precast concrete because the inside surface of the mould is kept in good condition. There is no grout loss, such as that from badly fitting formwork, which results in poor [...]

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No related posts. ]]> http://theconstructor.org/concrete/features-of-precast-concrete/6281/feed/ 0 PRECAST CONCRETE PROCESShttp://theconstructor.org/concrete/precast-concrete-process/6272/ http://theconstructor.org/concrete/precast-concrete-process/6272/#comments Sun, 25 Mar 2012 11:14:22 +0000 Gopal Mishra http://theconstructor.org/?p=6272 PRECAST CONCRETE PROCESS A large number of concrete structures (about 6% of the building frame market) are precast. The individual components are prefabricated off site then taken to site where they are erected. The following figures illustrate the precast concrete process: 1. Production of reinforced cages and main connections: The precast factory often has specialist [...]

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No related posts. ]]> http://theconstructor.org/concrete/precast-concrete-process/6272/feed/ 0 WHAT IS PRECAST CONCRETE?http://theconstructor.org/concrete/what-is-precast-concrete/6261/ http://theconstructor.org/concrete/what-is-precast-concrete/6261/#comments Sun, 25 Mar 2012 10:26:58 +0000 Gopal Mishra http://theconstructor.org/?p=6261 Precast concrete is cast under factory controlled conditions and not erected on site until it is fully hardened. Just like in-situ concrete, precast concrete can be plain, reinforced or prestressed concrete. Cast in-situ concrete is formed on site using traditional methods of formwork and ready-mixed concrete. Fig: Plain precast concrete Fig: Reinforced precast concrete Fig: [...]

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No related posts. ]]> http://theconstructor.org/concrete/what-is-precast-concrete/6261/feed/ 0 PRESTRESSED CONCRETE OVER REINFORCED CONCRETE AND ARCHhttp://theconstructor.org/others/prestressed-concrete-over-reinforced-concrete-and-arch/6255/ http://theconstructor.org/others/prestressed-concrete-over-reinforced-concrete-and-arch/6255/#comments Fri, 23 Mar 2012 15:22:25 +0000 Gopal Mishra http://theconstructor.org/?p=6255 COMPARISON BETWEEN PRESTRESSED CONCRETE, RCC AND ARCH Concrete is a building material strong in compression but relatively weak in tension. There are two ways of overcoming this problem: Embed another material in the concrete which is strong in tension – reinforced concrete Remove the tension altogether – by arching or prestressing. Reinforced concrete: In reinforced [...]

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No related posts. ]]> http://theconstructor.org/others/prestressed-concrete-over-reinforced-concrete-and-arch/6255/feed/ 0 PUNCHING SHEARhttp://theconstructor.org/structural-engg/analysis/punching-shear/6247/ http://theconstructor.org/structural-engg/analysis/punching-shear/6247/#comments Fri, 23 Mar 2012 14:42:09 +0000 Gopal Mishra http://theconstructor.org/?p=6247 What is punching shear? Consider a portion of slab subjected to an increasing concentrated load. Eventually the slab will fail. One possible method of failure is that the load punches through the slab. Thus, the failure mechanism is by shear, hence the name is punching shear. Some examples of the occurrence of concentrated loads on [...]

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]]> http://theconstructor.org/structural-engg/analysis/punching-shear/6247/feed/ 1 ANALYSIS OF SHEAR WALLShttp://theconstructor.org/structural-engg/analysis-of-shear-walls/6243/ http://theconstructor.org/structural-engg/analysis-of-shear-walls/6243/#comments Fri, 23 Mar 2012 14:02:34 +0000 Gopal Mishra http://theconstructor.org/?p=6243 The analysis of a framed building with shear walls subjected to horizontal and vertical load is essentially a three-dimensional problem. With the proliferation of computer programs available a three-dimensional analysis presents no great difficulty provided the modeling techniques fully reflect the behavior of the structure. The only penalty is time. Sometimes, especially where a dynamic [...]

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]]> http://theconstructor.org/structural-engg/analysis-of-shear-walls/6243/feed/ 0 SHEAR WALL – ITS TYPES AND POSITIONINGhttp://theconstructor.org/structural-engg/shear-walls-structural-forms-positioning/6235/ http://theconstructor.org/structural-engg/shear-walls-structural-forms-positioning/6235/#comments Fri, 23 Mar 2012 07:21:16 +0000 Gopal Mishra http://theconstructor.org/?p=6235 SHEAR WALL In reinforced concrete framed structures the effects of wind forces increase in significance as the structure increases in height. Codes of practice impose limits on horizontal movement or sway. Limits must be imposed on lateral deflection to prevent: Limitations on the use of building, Adverse effects on the behavior of non-load bearing elements, [...]

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]]> http://theconstructor.org/structural-engg/shear-walls-structural-forms-positioning/6235/feed/ 0 CONCRETE CREEPhttp://theconstructor.org/concrete/concrete-creep/6224/ http://theconstructor.org/concrete/concrete-creep/6224/#comments Thu, 22 Mar 2012 07:32:32 +0000 Gopal Mishra http://theconstructor.org/?p=6224 CONCRETE CREEP Creep is defined as the long term deformation under a sustained load. Water within the hardened cement paste is forced to more as a result of the applied load. This movement of moisture is the primary cause of creep deformation. Some movement also occurs due to the propagation of microcracks. The movement due [...]

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]]> http://theconstructor.org/concrete/concrete-creep/6224/feed/ 1 FACTORS AFFECTING STRENGTH OF CONCRETEhttp://theconstructor.org/concrete/factors-affecting-strength-of-concrete/6220/ http://theconstructor.org/concrete/factors-affecting-strength-of-concrete/6220/#comments Wed, 21 Mar 2012 15:08:28 +0000 Gopal Mishra http://theconstructor.org/?p=6220 FACTORS AFFECTING CONCRETE STRENGTH Concrete strength is effected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and curing of concrete. 1. Quality of Raw Materials: Cement: Provided the cement conforms with the appropriate standard and it has been stored correctly [...]

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