Process for creating design of Seismic Tie Beams

Tie beams are constructed to support the differential settlement among the isolated footings other than the vertical loads of the block works.

With reference to ACI 318-08 section 21.12.3.2, grade beams which are built up to function as horizontal ties among pile caps or footings should be proportioned in such a way so that the smallest cross-sectional dimension is identical to or exceeding the clear spacing among associated columns divided by 20 but should not be over 18 inches. Closed ties should be arranged at a gapping not surpassing the lesser of one half the lowest orthogonal cross-sectional dimension and 12 inches.”

But, it becomes difficult to understand that what force these tie beams are required. In this regard, IBC 2009 section plays an important role.

IBC2009 section 1809.13 for shallow foundations and 1810.3.13 for deep foundations.

For SDC C, D, E or F, ties have the capacity to bear, in tension or compression, a force similar to the smaller of the product of the larger pile cap or column design gravity load times the seismic coefficient, Sds, divided by 10, and 25 percent of the smaller pile or column design gravity load.

In brief, Tie beam force; FT = Larger of ( Pu_large x Sds /10 , Pu_small x 25%)

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Published By

Rajib Dey

www.constructioncost.co

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Benefits of developing precast concrete homes

Precast Concrete Homes is now considered as a very popular construction method all through the globe as they are exceedingly solid and durable. Various precast concrete panels are used to develop a building. It is possible to build a standard 4 bedroom home just in 8 weeks. Any building can be constructed 16 weeks quicker as compared to brick veneer. This construction method facilitates the builders to complete more homes in each year.

Precast Concrete Homes are formed with the concrete walls which offer superior thermal and acoustic insulation to make the home stronger. They contain good resistance capacity to cyclones, floods, earthquakes and ground movements. Besides, they are also mold and mildew resistant related to a customary wood or brick home. They are also very useful for bushfire prone areas because they surpass the Australian Bushfire Standard (AS3959) for the utmost “Flame Zone” category.

Total precast homes contain no beams and columns in the basement which offers stretched clear spans for a very flexible design. Precast floors are very useful if they are amalgamated with radiant heat.

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Published By

Rajib Dey

www.constructioncost.co

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Detailed processes for bond beam concrete block construction

A "bond beam" refers to a reinforced element that is placed horizontally in a masonry wall to withstand shear loads as well as disperse lateral loads all through the wall section. The bond beam transmits horizontal strength to a wall where it is not possible to be fortified with floor or roof structure. Bond beams enclose steel reinforcing in grout or concrete, ties the structure all together horizontally, and frequently interlock with supplementary vertical reinforcement. A bond beam is generally built adjacent to the top of a freestanding wall. A bond can also be applied to deliver a stable anchorage toward floor or roof structure. Bond beam assemblies are generally found in construction made with concrete masonry units, where special shapes allow the beam to be merged with the wall construction, but may also be constructed with brick or developed in concrete.

A single bond beam contains two courses of AB Fence Panel Block and their cores are filled through sand mix grout. Horizontal steel is arranged amid the two courses of block and reinforce the whole bond beam. To provide extra support, wire stirrups are arranged in each of the first two cores from each end and almost each other core with at least one stirrup per block, to make sure that the courses are not detached. This bond beam configuration develops a robust structural beam that can easily reinforce the fence panel structure. Bond beams are mostly applied at the top and bottom of the fence panel to produce a coordinated fence panel structure. Intermediate bond beams are necessary when the height of the AB Fence is raised.

Bond beams are occasionally haphazardly arranged in walls as a stiffening or tie element at tops of walls, floor connections, and top of foundation walls. Intermediate bond beams are generally not essential if not required to withstand shear stresses or to satisfy minimum seismic reinforcement requirements.

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Published By

Rajib Dey

www.constructioncost.co

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