Essay: Analysis of Seismic Loads acting on multistory Building as per IS: 1893-2002 and IS: 1893-2016 :- A comparative Study

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  • Analysis of Seismic Loads acting on multistory Building as per IS: 1893-2002 and IS: 1893-2016 :- A comparative Study
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Abstract: – Many changes and improvement in the Earthquake resistant design of structure is done in past recent years. It results in the changes in the Indian seismic code IS 1893 which is revised and drafted in year 2016, after a time elapsed of nearly 14 years.
In this paper we represents the seismic load assessment for multistory building as per IS: 1893-2002 and IS: 1893-2016 recommendations. Considering and analyzing the four storey RC framed multistorey building.

It is concluded that such study is done on individual RC framed building structure which is designed using earlier code. To predict the seismic vulnerability of building structure and to check due to revisions and changes in the IS codal provisions the structure is safe or unsafe.

Keywords: – seismic loads, IS: 1893-2002 RC framed buildings, IS: 1893-2016, IS codal recommendations

I. INTRODUCTION

Seismic code help designer to construct and improve the behavior of structure. So it can withstand during Earthquake effect and reduce loses. Seismic code are unique for particular country and region.

Seismic code consider the local seismology with recognized level of Earthquake risk, properties of raw material, methods and technique used in design and construction of building. It shows the country progress and development in the field of Earthquake Engineering.

The changes made in the IS code based on the observation and data collected from past Earthquakes, and Experimental and logical studies done by engineers, scientists, and seismologists.

As the continuous analysis and efforts put by researchers to study the behavior and performance of structure during past earthquake leads to development and advancement in designing earthquake resistant structure. Therefore, it is required to revise the seismic code time to time. IS: 1893-2016 revised after 14 years in year 2016.

The building design according to previous code are also checked according to revised code as per IS code recommendations. Comparison of building designed according earlier code is done as per revised code recommendation to check whether the building is safe or not safe. If any structural deficiency is found the building is retrofitted to withstand expected design earthquake vibration.
The goal of this paper is to calculate the seismic forces acting on the building as per IS: 1893-2002 and IS: 1893-2016. And also comparison of seismic forces is done using both codes.

II. CHANGES DONE IN IS: 1893-2016

IS 1893 was first published in 1962 and it has been revised 5 times. Last revision was done in 2002 and presently, draft code of part I has been released. The following significant changes have been included in this revised code:

Design spectra are defined for natural time period up to 6 s;
for all building structures same design response spectra are specified;
Bases of various load combinations are made consistent, with other codes;
Temporary structures are brought under the insight of this code.
Importance Factor provisions are modified in code;
A provision is introduced to ensure that all buildings are designed and constructed for at least a minimum lateral force;
Buildings with flat slabs are brought under the insight of this code;
Additional clarity is brought in consideration how to handle different types of irregularity of structural system;
Effect of masonry infill walls has been contained in design of building frame structure;
Method is introduced for determining approximate natural time period of building structures with basements, step back buildings and buildings on hill slopes;
Torsional provisions are made easier; and
liquefaction potential analysis method is Simplified

III. Details of Buildings

The multi storey RC buildings are considered for analysis. The building structure is analyzed as individually distinct system having lumped masses at each floor level. The structural load calculated on each floor are

Permanent load (include all the load on each floor).
Weight of one – half of the columns,
Weight of the walls above and below the floor.
Some amount of live load which always act on the building structure

The geometrical detail of the building is given and we find the fundamental time period of the building structure by using empirical relation as per IS: 1893-2002 and IS: 1893-2016.

Four storey building

Considering RC framed building with 3 x 4 bay configuration. Consider a four-storey RC framed office building as shown in Fig. 1.1. The RC framed building is situated in seismic zone III and soil is medium stiff. The RC framed building is supported on a raft foundation. The reinforced concrete frames of building are infilled with brick-masonry. The dead and live load acting on the floor of building is 12 kN/m2 and 4 kN/m2 respectively. The dead and live load acting on the roof of the building is 10 kN/m2 and 1.5 kN/m2 respectively. Increase the no. of storey and Calculate seismic load acting on the RC framed building structure as per old and new code.
The detailing of the building is done according to the IS: 13920-1993 and also provided with moment resisting frame (MRF). Moment resisting frame provided for lateral load resistance and also infilled with brick masonry panels.

Fig. 1 – Building Configuration

The Zone factor, Z is 0.16 for seismic zone III. As the building is official building, the Importance Factor, I is 1. The response reduction factor, R is 5. The values of Zone factor, Importance Factor, response reduction factor are given same in the both IS codes.
The fundamental time period calculated using previous and revised code is same as 0.28 sec. and base shear calculated from both code as 832 kN.

Table 1 – Lateral Load distribution with height by the Static Method
Storey
Level Wi (kN) hi (m) Wi hi2 x 1000 (W_i h_i^2)/(∑▒〖W_i h_i^2 〗) Lateral Force at ith Level for EL in direction (kN)

X Y
4 4000 13.8 761.76 0.424 352.768 352.768
3 5600 10.6 629.216 0.350 291.2 291.2
2 5600 7.4 306.656 0.171 142.272 142.272
1 5600 4.2 98.784 0.055 45.76 45.76
1796.416 832 832

Fig. 2 – Design seismic force on the building for X and Y direction

Five storey building
The fundamental time period calculated using previous and revised code is same as 0.3421 sec. and base shear calculated from both code as 1056 kN.

Table 2 – Lateral Load distribution with height by the Static Method
Storey
Level Wi (kN) hi (m) Wi hi2 x 1000 (W_i h_i^2)/(∑▒〖W_i h_i^2 〗) Lateral Force at ith Level for EL in direction (kN)

X Y
5 4000 17 1156 0.3549 374.774 374.774
4 5600 13.8 1066.464 0.3274 345.734 345.734
3 5600 10.6 629.216 0.1931 203.914 203.914
2 5600 7.4 306.656 0.0941 99.37 99.37
1 5600 4.2 98.784 0.0303 31.99 31.99
3257.12 1056 1056

Fig. 3 – Design seismic force on the building for X and Y direction
Six storey building
The fundamental time period calculated using previous and revised code is same as 0.4065 sec. and base shear calculated from both code as 1280 kN.

Table 3 – Lateral Load distribution with height by the Static Method
Storey
Level Wi (kN) hi (m) Wi hi2 x 1000 (W_i h_i^2)/(∑▒〖W_i h_i^2 〗) Lateral Force at ith Level for EL in direction (kN)

X Y
6 4000 20.2 1632.160 0.305 390.4 390.4
5 5600 17 1618.400 0.3024 387.072 387.072
4 5600 13.8 1066.464 0.1992 254.976 254.976
3 5600 10.6 629.216 0.1175 150.4 150.4
2 5600 7.4 306.656 0.0573 73.344 73.344
1 5600 4.2 98.784 0.0184 23.552 23.552
5351.68 1280 1280

Figure 1.2 – Design seismic force on the building for X and Y direction

Load calculation as per IS: 1893-2016 recommendations
The aim of the various IS codal recommendation of IS: 1893 is to make sure that structure is able to respond to the earthquake vibration without any structural damage to the structure at moderate intensity and not entirely collapse at the vibrations of high intensities.
As for given building the codal provision for designing the building is similar. So the load calculated for given four storey building is same.

II. CONCLUSIONS

As the analysis of the building structure is carried out from both IS codes to inspect the changes done in latest IS code for calculating lateral force of the multistorey building. The strong and ductile structure is designed as per seismic design approach of both IS codes. The lateral forces acting on the upper storey are more than the lower storey of the building. As we increases the no. of storey in the building the lateral forces acting on the upper storey of the building increases with increase in the base shear of the building .The lateral load and seismic force calculated is same. The building is safe as per revised code and no any structural deficiency is found. There is no need retrofitting of building to withstand expected design earthquake vibration.

REFERENCES

Chopra, A. K. (2002), Dynamics of Structures, 2nd Edition, Prentice Hall of India Private Limited, New Delhi, India.
IS:1893-2016, Criteria for Earthquake Resistant Design of Structures, Bureau of Indian Standards, New Delhi, India.
IS:1893-2002 (Pt. 1), Criteria for Earthquake Resistant Design of Structures, Bureau of Indian Standards, New Delhi, India
IS:13920-1993, Ductile Detailing of Reinforced Concrete Structures Subjected to Seismic Forces – Code of Practice, Bureau of Indian Standards, New Delhi, India.
S.K. Ahirwar, S.K. Jain and M. M. Pande , , earthquake loads on multistorey buildings as per Is: 1893-1984 And Is: 1893-2002 : comparative study , The 14th World Conference on Earthquake Engineering (WCEE) October 12-17, 2008, Beijing, China
Dr. Sudhir K Jain, Explanatory Examples on Indian Seismic Code IS 1893 (Part I) ,Department of Civil Engineering , Indian Institute of Technology Kanpur, India

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