What are the Stability checks criteria for the High rise building?
The criteria for the stability checks for the tall
buildings are as follows: -
storey drift ratio should be less than 0.004. (Clause 18.104.22.168 of IS
1893(Part 1): 2016
- The maximum deflection
against wind allowed is H/500. (Clause 5.4 of IS 16700:2017)
- Maximum deflection against EQ allowed = H/250. (Clause 5.4 of IS 16700)
deflection against cantilever or any individual element allowed = span/350 or
20 mm whichever is less. (Clause 23.2.B of IS 456:2000).
- Guidelines for
fundamental time-period = 0.1 * N (N= No of levels)
of modes given should be given in such a way that around 95 to 98% modal
participating man ratio shall be achieved. (Clause 22.214.171.124 of IS1893 (Part
- 1st mode of vibration is preferred to be in translation mode. (Clause 5.5.1 of
the frequency of the building is less than 1Hz then wind dynamic analysis needs
to be done by considering the guest factor. (Clause 9.1 of IS875(Part 3)
:2015) and for the Dynamic wind, response refers to chapter 10 of the same code describe at this point.
- For key elements
(elements acting as transfer beams) design over strength factor of 1.5 need to
be used for EQ loadings. E.g.: Load
combination (Additional factor of 1.5 need to be multiplied for EQ load case
for the following load combinations)
- 1.5D + (1.5 * 1.5) E
- 1.2D + 1.2 L +
- 0.9D + (1.5*1.5) E
the expansion joints are there in the building the distance of expansion joint
need to be as per (Clause 7.11.03) of IS1893 Part 1-20
- All the structures
elements need to well within the strength design limit criteria.
Discuss about Eigen Vector and Ritz Vector?
Eigenvector analysis determines the undamped free-vibration mode shapes and frequencies of the system. These natural modes provide an excellent insight into the behaviour of the structure. Ritz-vector the analysis seeks to find modes that are excited ...
What is Soil Structure Interaction?
The effects of soil-foundation interaction, e.g., the differential settlement, may have a significant impact on building response. ETABS offers a modelling option to automatically generate foundation springs and dashpots for isolated column footings ...
What is the Construction Sequence analysis?
Implicit in most analysis programs is the assumption that the structure is not subjected to any load until it is completely built. This is probably a reasonable assumption for live, wind and seismic loads and other superimposed loads. However, in ...
What is the Meshing in Finite Element Method?
A mesh is a network of line elements and interconnecting nodes used to model a structural system and numerically solve for its simulated behavior under applied loading. First, computational techniques create an analytical model by populating the ...
What are shoring piles?
Shoring is used to support a structure to prevent a collapse. The most common shoring techniques that we encountered are during the early stage of construction which is an excavation. Shoring is intended to support a deep excavation to prevent the ...