A comparative study on ASCE 7-16, TBEC-2018 and TEC-2007 for reinforced concrete buildings

Abstract

Doctrines of earthquakes and also the latest approaches of earthquake resistant building design in standards need to be revised periodically. While the revisions and updates in the American standards occur over periods of three or five years including limited subjects, in Turkey the same revisions are done once over long periods including the whole subjects of the standards. As examples the standards of 1975, 1998, 2007 and finally 2018 could be given. Especially, in 2018 standard (TBEC-2018) many changes were made over concepts and criteria. The procedure of calculating the earthquake loads in 2018 standards is similar to the one in the American standards of (ASCE-7-16), however for the element design the changes are shown as developments over the one of 2007 earthquake standard (TEC-2007). The changes made by 2018 standard for calculations of earthquake loads and their effects on civil engineering are very important factors of new building design. The earthquake load affecting a building which is the first factor of earthquake resistant building design shows important differences according to the condition changes in the standard. Based on this motivation in this study reinforced concrete frame type buildings of different elevations were researched by using ETABS (structural software for building analysis and design) according to linear equivalent seismic load method. According to the analysis results of the chosen buildings, a comparison forthe base shear force, top displacement and relative story displacement between TEC-2007, TBEC-2018 and ASCE 7-16 standards was carried out. From the analysis results, it is found that for most of the soil classes while the maximum base shear forces in 3 and 5-story buildings are achievedat TEC-2007, the maximum base shear forces in 7 and 9-story buildings are achieved at TBEC-2018. Also, it is predicted that the higher increment in the design forces of buildings with higher elevations is obtained at TBEC-2018 for strong soils, and at TEC-2007 for weak soils. By considering cracked sections at TBEC-2018 the calculations displacement and period was affected as periods in TBEC-2018 were increased by almost 34% respected to TEC-2007. The same increment ratio was determined for ASCE 7-16 as 45%. Also, as a response for the increments in period, the spectral acceleration determined from the elastic spectrum diagram was decreased. At the end of the study, nonlinear performance analysis was also performed and performance points were determined according to the demand spectra of the seismic codes. ASCE's demand displacement values are in any case lower than Turkish codes. TBEC-2018 reveals less displacement demands in high-rise buildings than TEC-2007. The closest results for the three regulations occurred on the softest grounds.According to the results obtained from the static pushover analysis, a ductile behavior occurred in all of the structural systems and plastic hinge mechanism started from the beams firstly.

Natural Hazards - Impacts, Adjustments and Resilience

“…The results of ultimate strain limits for NC-PL of EC-8 and SEMAp are matching ( Table 3; [9]). Similarity is there in ultimate rotation values of RCA and SEMAp ( Table 3; [10]). The ultimate rotation values of columns designed using ACI-318 and EC-8 are found to be in similar range and are higher than rotation limit of IS designed building ( Table 3; [10]).…”

“…The present codes include the cyclic behavior through simpler procedures for performance-based design of building structures with reduced vulnerability [6][7][8][9]. TEC-2007 has been upgraded to Natural Hazards -Impacts, Adjustments and Resilience DOI: http://dx.doi.org/10.5772/intechopen.94303 TBEC-2018 for design of new buildings with taller stature [10]. Also, the design of buildings with FIB Model Code 2010 is considered to upgrade the force-based provisions of EC-8 to displacement-based procedure [11].…”

Seismic Response for Building Frames in the Wetlands Area

“…Step 14: Calculating the equivalent static EQ load (Fi) acting at the mass center of the floors [14] Base shear is then distributed into each floor as lateral point load at beam-column joint (Figure 2), using the following equations; for major axes and for minor axes, according to [9], [15], and [16].…”

A novel inter-story drift limit proposal for TBEC2018 and fragility prognosis with TSC2007

“…A few literature studies related to TBEC2018 are listed. For instance, TSC 2007, TBEC2018 and ASCE7-16 were compared to each other in terms of base shear force, top displacement, period of structure and relative story displacement on mid-rise reinforced concrete structures by using nonlinear dynamic analysis [11]. Doğan et al produced a total of 12 reinforced concrete columns full scale with square cross sections were tested under earthquake resembling reversible cycling lateral load and axial force.…”