Construction of . Soil profile: S3 (a soil profile 21 meters or more in depth and containing more than 6 meters of soft to medium stiff clay but not more than 12 meters of soft clay) Site coefficient: 1.5. Although you may hear the terms "seismic zone" and "seismic hazard zone" used interchangeably, they really describe two slightly different things. In previous Bangladesh National The Indo-Burman region is a prominent earthquake-prone area, where seismicity is governed by subduction of the Indian Plate beneath the Burma plate at a gentle angle (Fig. On the basis of distribution of earthquake epicenters, ground motion attenuation, geophysical and tectonic data available, Bangladesh was mapped dividing into three generalized seismic zones in BNBC-1993. At a minimum, a seismological evaluation should be performed on all projects located in seismic zones 1, 2, and 3 of Bangladesh [8], depending upon the severity of earthquakes. The after effect of earthquake is more severe in an underdeveloped and a densely populated country like ours than any other developed countries. Bangladesh is located in the . 2 Seismogenic Zones 7 2.1 Earthquake Catalogue 8 2.2 Fault Map 8 2.3 Regional Recurrence 9 . (ICCESD 2016), 12~14 February 2016, KUET, Khulna, Bangladesh (ISBN: 978-984-34-0265-3) ICCESD 2016 937 EFFECT OF TIME PERIOD AND DAMPING COEFFICIENT ON SEISMIC PERFORMANCES OF OGS RC BUILDINGS Md. Zone coefficient: 0.15. Seismic zone: 2. This earthquake zones are displayed in a map on page - 6 of the code. Due to Seismic zone coefficient of moderate seismicity region (Zone II) Dhaka is 0.15 (BNBC, 1993). Tectonic framework of Bangladesh and adjoining areas indicate that Bangladesh lies well within an active seismic zone. 2. The capital city Dhaka is situated in the seismic Zone 2, which has a basic seismic coefficient of 0.15g. So, there has been a 1 Introduction. 1).This convergence is . Among heavy metals, Cadmium is absent whereas Nickel and Chromium content are 9.507 ppm and 8.1631 ppm respectively in the soil of Zone 2A and 2B. 3. 0.075. Zone 2A and 2B is non-saline, slightly alkaline and organic content is very low (0.2%). Each building or structure shall be assigned a Seismic Zone Coefficient, Z corresponding to the seismic zone of the site as set forth in Table 3. 6.4.2 of IS1893 - 2002: Where, Z is the zone factor, given in table 2 of IS1893 - 2002. Online service for determining the reference peak value of the ground acceleration with display of the seismic zones in Bangladesh according to BNBC: 2015. In strong seismicity areas, a dynamic . The viaduct spans are designed for a seismic event with a return period of 475 years. Table 1 Seismic Zone Coefficients, Z Seismic Zone (see Fig.1) Zone Coefficient. Figure: Seismic zonal map of Bangladesh (BNBC 2006) There are two methods specified in BNBC to calculate seismic loadings. The northeastern folded regions of Bangladesh are the most active zones and belong to the zone-I. A seismic zone is used to describe an area where earthquakes tend to focus; for example, the New Madrid Seismic Zone in the Central United States. . period also. Table 4: Different coefficients taken into account for the calculation of seismic load Name Symbol Value Description Seismic Zone Coefficient Z 0.15 Zone 2 (Dhaka) Structural Importance Coefficient I 1 Standard occupancy Structure (Commercial -Office) Site Coefficient S 1.2 Soli profile type S2 (deep cohesionless or stiff clay) They have different seismic zone coefficients. Republic of Bangladesh is located within the zone of high geotectonic active region with several seismic events taken place during the extended period of observations in Bangladesh and on the territories of adjoining countries (India, Myanmar, Nepal) (IRIS 2018).Data on the catastrophic increase of seismic activity in this region due to the diastrophic movement of three major tectonic plates . However the seismic zone coefficient and wind speed varies for different parts of Bangladesh. 2 . the location of the site on the Seismic Zoning Map as in BNBC-2006. the effect of earthquake is incorporated here using the suitable seismic coefficients. Introduction Demand of land has been increased due to high growth rate of population in Bangladesh. For the peak ground acceleration (PGA) corresponding to two-thirds of the PGAM (Maximum Considered Earthquake-Geometric Mean, MCEG adjusted for site effects ASCE 7-10 Eq. The following parameters were used in the de-sign to AASHTO LRFD: Acceleration coefficient: 0.143g Seismic Zone: 2 Peak ground acceleration: 0.1414 m/s² Soil Profile: Type II A finite element modeling and analysis is generated. The factor of safety without considering any earthquake (i.e. Code Location Zone coefficient Site class ASCE 7-10 San Francisco, USA Spectral response acceleration parameter Ss=1.83 ,S1=0.85 Site class D, Stiff soil IS 1893 Bhuj, Gujrat, India Seismic zone :V, Zone factor =0.36 Type II (Medium soil) Table 5: Details and Dimension of Building Model Story Column Beam So, the maximum ground acceleration for Dhaka comes accordingly following the code is 0.15 g ≈147.15 cm/s 2 which is 61.58 ≈62 times greater than that of Natore data. Thus, the traditional seismic coefficients have to be interpreted in terms of 2 presents the proposed seismic zoning map for Bangladesh based on PGA values for a return period of 2475 years. Seismic zone: 2 10. Table 3: Seismic zone coefficient in Bangladesh . The after effect due to earthquake is more severe in a developing and densely populated country like Bangladesh than any other developed countries. Seismic Zone Zone Coefficient, Z I 0.075 II 0.15 III 0.25 . Seismic Vulnerability Assessment of Existing Building Stocks at Chandgaon in Chittagong city, Bangladesh more by Atik Sarraz Abstract: The draft of Bangladesh National Building Code (BNBC)-2012 has been updated the seismic coefficient of 0.28g (with Zone III) for Chittagong region, which is larger than the previous of 0.15g (with Zone II). 2.2 Design Earthquake . In the basic seismic zoning map of Bangladesh Chittagong region has been shown under Zone II with basic seismic coefficient of 0.15, but recent repeated shocking around this region indicating the possibilities of potential threat Along with all the potentiality, the city also falls in the most severe earthquake vulnerable zone (Zone IV with. Figure: Seismic zonal map of Bangladesh (BNBC 2006) There are two methods specified in BNBC to calculate seismic loadings. Then the nature of the structure exposed to ground motion is captured with response spectrum analysis, using BNBC-2020 for four different seismic zones in Bangladesh. Site coefficient: 1.5 15. with the existing and proposed seismic zone coefficient of Chittagong, which has been showed in the following Table 1. Earthquake Zone Co-Efficient Fig. Geographically Bangladesh is situated near three active plate which is responsible for some major earthquakes around the world. lies in the zone I as per the seismic zoning map of Bangladesh National Building Code . MIRAMARE - TRIESTE May 1989 * To be submitted for publication. For the high risk zone, the PGA value will be increased about 1.5 times compared to the existing BNBC (1993) seismic zoning map. The dam was analyzed at U/S & D/S considering seismic coefficient in the range of 0.05 ~ 0.15. 0.075. Each zone has a seismic zone coefficient (Z) which represents the maximum considered peak ground acceleration (PGA) on very stiff soil/rock . Previously, earthquake zones divided into five zones with respect to the severity of the earthquakes, but Bureau of Indian Standards . Bangladesh National Building Code (BNBC) was first established in 1993 to provide guidelines for design and construction of new . 2 . a 36 g seismic coefficient) of Bangladesh and is surrounded by major faults including Madhupur Blind Fault, Dauki Fault, and Sylhet-Assam Fault (Alam and Haque, 2017, 2018; Apu & Das, 2020; Morino et al., 2011). This indicate a potential threat of earthquake for Chittagong dwellers. Exposure category: Exposure A 12. Seismic zones in Indian subcontinent is divided into four seismic zones (II, III, IV, and V) based on scientific inputs relating to seismicity, earthquakes occurred in the past and tectonic setup of the region. 1. The country is divided into four seismic zones with zone coefficient Z equal to 0.12 (Zone 1), 0.2 (Zone 2), 0.28 (Zone 3) and 0.36 (Zone 4). Naga thrust and Disang thrust, is a zone of high seismic risk with a basic seismic co-efficient of 0.08. Bangladesh has been divided into three seismic zones on the basis of morphotectonic and seismic behaviour. Each zone has a seismic zone coefficient (Z) which represents the maximum considered peak ground acceleration (PGA) on very stiff soil/rock (site class SA) in units of g (acceleration due to gravity) The northeastern folded regions of Bangladesh are the most active zones and has a maximum PGA value of 0.36 g. Fig. In the proposed building code, soil coefficient is similar to This region has a seismic coefficient of 0.15g in the seismic zoning map of Bangladesh National Building Code (BNBC, 1993). Zone coefficient: 0.15 11. 1.4. Basic wind speed: 210 kph 1. Scaling factor is rounded to 62. Similar study can be performed for other parts of Bangladesh especially for seismic active zones. structures. 0.15. Engineers are free to choose any of these methods. Earthquake Induced Liquefaction Potential of Reclaimed Areas of Dhaka City. Engineers are free to choose any of these methods. The most significant loading condition for the viaduct spans is the seismic loading. b. In previous Bangladesh National The Economic Zone sites fall under seismic : 3 depicts the variation of the factor of safety with K h for a constant K v K h 0.5, where K v and K h are the vertical and horizontal seismic coefficients, respectively. The revised BNBC 2017 has divided the seismic zones of Bangladesh into four different categories such as Zone-1, Zone-2, Zone-3 and Zone-4 respectively. 1. Revision: 1993 (Final Draft) Horizontal Base Shear where: Z: Seismic zone coefficient (see Table 1,and Fig.1) I: Structure importance coefficient (see Table 2) R: Response modification coefficient for structural systems (see Table 3) The zonal coefficients of these zones are respectively 0.075, 0.15 and 0.25. Assessment of seismic hazard at any particular site requires an attenuation law for the Peak Ground Acceleration (PGA) For Bangladesh no PGA is available due to the lack of seismic devices Attenuation law for alluvial soils: McGuire (1978) - PGA=0.0306e0.89Mrr-1.171.17ee-.2 (in g)(in g) Structure importance coefficient: 1 13. This map was based on Peak Ground Acceleration (PGA) considering a return period of 200 years. Welcome to Bangladesh National Building Code We appreciate your feedback/comments on any part of draft BNBC. The seismic coefficient method of analysis should be used in determining the resultant location and sliding stability of dams. ** Permanent address: Department of Geology, Dhaka University, Dhaka-1000, Bangladesh. These plates can be the responsible for major earthquake in future. Chittagong, the port city of Bangladesh is in zone II with the seismic zone coefficient 0.15g of the proposed code. World Seismic Zones Country/City Seismic Zone Afghanistan ‐ Kabul 4 Albania ‐ Tirana 3 Algeria ‐ Alger 3 Algeria ‐ Oran 3 Anglola ‐ Luanda 0 Argentina ‐ Buenos Aires 0 Australia ‐ Brisbane 1 Australia ‐ Canberra 1 Australia ‐ Melbourne 1 Australia ‐ Perth 1 Australia ‐ Sydney 1 Austria ‐ Salzburg 2A Austria ‐ Vienna 2A The zonal coefficients of these zones are respectively 0.075, 0.15 and 0.25. In Gutenberg-Richter (GR) earthquake frequency magnitude relationship the b-value plays an important role and is required for the seismic hazard analysis of any region.In this study, both the Gumbel's extreme distribution and the GR methods are used to estimate the b-value for Sylhet region of Bangladesh.Due to the geological location this region is the most seismically vulnerable area of . 1993 Bangladesh national building code has adopted a seismic zoning map (Ali and Choudhury, 1994) consisting of three seismic zones, with zone coefficients of 0.25 (Zone 3 in the north and. This paper focuses on the comparison of seismic design provisions in Bangladesh (BNBC-1993), India (IS-1893), and the U.S. (ASCE 7-10) in relation to analysis, design, and seismic performance of reinforced concrete buildings on the basis of the type of allowable analysis procedures, zoning system, site classification, fundamental vibration period of the structure, response reduction factor . 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