Statistical products, microsoft software, and ubc administrative system software are available through it, with the advantage of lower prices and a convenient installation process. For all the cases investigated, the ubc was found to be. They are used in a general, threedimensional, beamcolumn formulation which includes the effects of biaxial bending, torsion, axial deformation, and biaxial shear deformations. How do you decide scale factor in sap2000 while defining. Now, if we define our spectrum to software, there will be no need to. If the same is not mentioned then on broad respect following lines can be considered. In the seismic loads drop down list, if the code en 19981.
Do check out the link posted above for the complete list. Apply earthquake loads to building and apply wind load to building. Ubc 97 is not available in reponse spectrum definition. A comparison of ibc with 1997 ubc for modal response spectrum. Working with building models that were analyzed and designed in etabs, csixcad can automatically create plans, elevations, schedules, and 3d bim models. The us uniform building code was the most widely used seismic code in the world, with its last edition published in 1997. Eight sample places from sbc map for saudi arabia together with two sample places of high seismic activity in usa are taken for the comparisons.
Select the us seismic code ubc 91 the uniform building code 1991 in the new case definition dialog or click parameters in the analysis type dialog. Originally, when we were studying the dynamics of a simple single degree of freedom structure, we noticed that given one type of earthquake, we dont have to keep solving the equat. If you need to scaling base shear from response spectrum analysis you need to set structure period as show below. Could you kindly explain the issue 1 and issue 3 with any reference or snapshot. For all the cases investigated, the ubc was found to be significantly more. The spectrum data s,b,tb,td and tc are imposed by your client. Comparison of the seismic provisions of the 1997 uniform building code to the 1997 nehrp recommended provisions s. Robotseismic analysishow to create a seismic analysis. Displacementbased design of reinforced concrete moment resisting frame incorporating cross laminated timber infill and metallic damper connectors by jayanthan madheswaran b. Abstract although response spectra have been in general use for decades by researchers, academics, and. Practical dynamic analysis and design for engineers and.
It is part of the process of structural design, earthquake engineering or structural assessment and retrofit see structural engineering in regions where earthquakes are prevalent as seen in the figure, a building has the potential to wave back. Seismic design according to codes used in palestine. Building and fire research laboratory national institute of standards and. The ubc was first published in 1927 by the international conference of building officials, which was based in whittier, california. Principle directions in ubc 97 principle directions in ubc 97 dawn836 structural op 3 jan 06 08. Comparison of the seismic provisions of the 1997 uniform. The ubc 1997 provided formulas and tables to obtain amplification factor and develop the response spectra design. In this article, we will learn the seismic analysis provisions as specified in the uniform building code 97 ubc 97. The accelerograph records three orthogonal components of ground acceleration. There are basically two approaches allowed by most codes such as ubc 97 and ibc 200 to account for accidental torsion in dynamic analysis. The uniform building code ubc 1997 is employed to amplify a ground motion in base rock to be a ground motion on soil surface. In etabs, i defined response spectrum functions in ubc97, asce 710 and. Please refer to dynamic analysis textbooks if you want an indepth discussion regarding this braindamaging concept that is for me of response spectrum.
In etabs, beams, columns, and braces are frame elements that can be straight or curved. One should always check the time period used by the software. Seismic analysis is a subset of structural analysis and is the calculation of the response of a building or nonbuilding structure to earthquakes. Therefore it is important for everyone to do their due diligence to make sure that all works are complete and accurate. Program using the equivalent lateral force procedure and the dynamic analysis procedures as set out in ubc 97 response spectrum. The result of this amplification is a response spectra design as figure 4 on soil surface. All active students with a valid cwl account now qualify for a free office 365 subscription. Another spectrarelated study in which the observed and simulated displacement spectra were. Seismic qualified equipment eddie wilkie engineering manager power distribution organization americas. Students running windows can also install publisher and access. Youd like to create a seismic analysis with spectrum values different from the ones in the en199811 code. Ubc 97 provides guidelines for scaling of response spectrum.
Ubc 97 response spectrum seismic provisions seismic. Define seismic load and wind load in etabs using ubc 97 code. In addition to prota license agreement terms, it is the responsibility of. How do you decide scale factor in sap2000 while defining response spectrum method. Software downloads include word, excel, powerpoint, outlook, and onenote. Did you know that dynamic vs static base shear balancing. The uniform building code ubc was a building code used primarily in the western united states. To complete the seismic analysis according to the rules given in a code, define the following parameters. Principle directions in ubc 97 structural engineering. Parameters of a structure seismic analysis depend on a seismic code used during calculations of a structure influenced by seismic loads. Determine the maximum considered earthquake spectral response accelerations, adjusted for site class effects, at short period, sms, and at 1second period, sm1, in accordance with asce section 9. A comparison of saudi building code with 1997 ubc for. The frames are designed to satisfy the strongcolumn weakbeam requirement of the ubc 97.
Dear all if we doing response spectrum analysis as per ubc. How do we define response spectrum functions in different damping ratios in etabs. The engineering tools provided have been checked, but, that being said, wikiengineer is not able to guarantee the complete accuracy of all these works. So if you need to compare static force procedure results to dynamic modal response spectrum according to uniform building code 97 you may follow these steps. This paper presents a comparison of the seismic forces generated from a modal response spectrum analysis mrsa by applying the provisions of two building codes, the 1997 uniform building code ubc and the 20002009 international building code ibc, to the most common ordinary residential buildings of standard occupancy. We will summarize the different seismic parameters that we often use in the seismic analysis.
Displacementbased design of reinforced concrete moment. Most of the structural analysis software packages provide facility to get the. The four site coefficients s1 to s4 of the ubc 1994, which are independent of the level of ground shaking, were expanded to six. Ubc 97 response spectrum seismic provisions seismic design. Response spectrum analysis, seismic isolation, seismic rehabilitation, static analysis, timehistory analysis. Earthquake time history data is converted into a response spectrum. Static method of seismic analysis of piping system using. If any mistakes are found they will be added to the addendum portion you will find under each spreadsheet. It was intended to promote public safety and provided standardized requirements for safe construction which. Define seismic load and wind load in etabs tutorial using ubc 97. The procedure was then extended to estimate the seismic demands of inelastic systems.
If you have a 3d structural analysis software available, eg staad or risa, etc, they should allow you to model and analyze your structure to determine the lowest. While response spectrum template, generate button for ubc97 response spectrum is not available. Hi all here is some questions related to response spectrum analysis on ubc97. In etabs, i defined response spectrum functions in ubc97. As weve said above, this is the base shear derived from the response spectrum analysis which is performed by say etabs.
Response spectrum analysis was performed using the etabs software package. Seismic design equivalent lateral force spreadsheet v1. The earthquake ground motion and response spectra design. Uniform building code the 2000 international building code ibc is the successor of the 1997 ubc the basis. Define seismic load and wind load in etabs tutorial using ubc 97 code duration. A sample of four buildings with reported analysis of comparison between ibc and ubc is taken for confirming the comparison. Basis for seismic analysis the criteria for line selection for seismic analysis are normally mentioned in the itb documents if the construction site falls under the seismic zone. Design of structures with seismic isolation ronald l mayes, ph. The ratio of the initial dynamic base shear over the static base shear need not be unity.
Etabs has been enhanced for compatibility with csixcad, a new plugin from computers and structures, inc. For more information or to purchase software for use at the vancouver campus, please contact your local it support or ubc it software licensing. Eight sample places from sbc map for saudi arabia together with two sample places of. Define seismic load and wind load in etabs tutorial using. How do we define response spectrum functions in different. The study uses an actual building to compare the modal response spectrum analysis results of saudi building code sbc and the 1997 uniform building code ubc used in saudi arabia before the introduction of sbc. The base shear forces to use in the design will be calculated using the auto load function of etabs program using the equivalent lateral force procedure and the dynamic analysis procedures as set out in ubc 97 response spectrum analyses or asce 7 whichever code is required in your design. Introduction the most direct description of an earthquake motion in time domain is provided by accelerograms that are recorded by instruments called strong motion accelerographs. A comparison of ibc with 1997 ubc for modal response.
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