I have to look into it further and will revert back. Structural engineering, analysis, and design software. Pro will perform this check when the option check soft story command is used following a floor diaphragm. Analysis by staadpro and design of structural elements by. A typical soft story building is an apartment building of three or more. These results will also be compared with manual calculations of a sample beam and column of the same structure designed as per is 456. Design of multistoried residential building using staad. Two storey reinforced concrete design per nscp 2015 staad part 5 of 8 duration. Weak story the story which the story strength is less than 80% of that the story above. How to check story drift in staad pro lesson duration.
Inelastic seismic analysis of reinforced concrete frame. Storey stiffness seismic design structural engineering. The process of designing is defined in the best suitable manner it can be. Analysis of soft storey building in different seismic zones. Our project is aimed to complete with the help of staad pro gives more precise and accurate results than manual techniques. Pdf seismic response analysis of tall building using staad. Story drifts from staad with dynamic analysis mike20793 structural 24 mar 16 20. Confidently design steel, concrete, timber, aluminum, and coldformed steel structures anywhere in the world using over 90 included international design codes. K, arpan herbert international journal of civil and structural engineering volume 2 issue 3 2012 872 table 4. Incorporating 40 years of continuous research and development, this latest etabs offers unmatched 3d object based modeling and visualization tools, blazingly fast linear and nonlinear analytical power, sophisticated and comprehensive design capabilities for a widerange of materials, and insightful graphic. The warning shown for soft story with respect to floor levels not being defined is because individual floor heights should be defined before using the define command or any primary response spectrum load. Here in this project work based on software named staad pro has been used.
Comparison of design results of a structure designed using staad and etabs software prashanth. These weaknesses are usually created by sharp changes in stiffness, strength andor ductility, and the effects of these weaknesses are accentuated by poor distribution of reactive masses. They are two different software but their applications are quite similar. Mar 01, 2015 staad pro software manuals collection includes staad pro technical manual, staad pro v8i for beginners, staad. A soft story building is a multistory building in which one or more floors have windows, wide doors, large unobstructed commercial spaces, or other openings in places where a shear wall would normally be required for stability as a matter of earthquake engineering design. Structural software for building analysis and design etabs. Soft storeys have been considered by same floor heights and effect of infill walls is ignored. Development of multistoried rcc building model with soft. Structural enterprise the most popular structural applications in a single a costeffective license. Staad pro software can be used for analyzing and designing of the preengineered buildings. Pdf seismic response of soft storey on high rise building frame. Pro software package is a structural analysis and design software which helps in modeling. Ultimately, we are going to make some comparisons of the results obtained based on the different methods adopted in.
Analysis of building with soft storey during earthquake. Introduction soft story or stilt storey is a feature which can be seen frequently in india and abroad also, generally used for parking or retail purpose. As per the story stiffness printed out by the software, i see that the stiffness of the story at 22 ft is less than 60% of the stiffness of the story above and less than 70% of the average stiffness of 3 stories above. For structural engineer, now a days for designing buildings of 80 storey or even 110 storeys, manual calculations are becoming completed for analysis purpose. Computer aided analysis and design of multistoreyed buildings. Staad pro is a much known structural analysis and design software across the world. Abstract soft first storey is a typical feature in the modern multi storey constructions in. Example seismic analysis and design of a six storey building problem statement. From the design results of beams, it may conclude that etabs gave lesser area of required steel as compared to staad pro. This methodology is versatile not only due to its quality predesigning and prefabrication, but also due to its. Check soft story command checks for plan and vertical irregularities in a building viz.
In this study the variation in the structure was done while designing, considering omrf and smrf structures. How to design a multistorey building in staad pro quora. V8i and a cross check is done for selected members using limit state method of design as per is 4562000 uses a. Pro, all suggested and ranked by the alternativeto user community. The check soft story option may added to a floor diaphragm command set to check for soft stories per either is1893. A soft storey, also known as a weak story, is defined as a story in a building that has substantially less resistance, or stiffness, than the stories above or below it. Static analysis in the present work, using the staad pro software. Pabitra ranjan maiti associate professor department of civil engineering iitbhu, varanasi duration of project work. The seismic response of soft storey on highrise buildings and the effect of the seismic loads on the member forces of the basement are investigated in this study.
This pc program was developed to work on windows xp, windows vista, windows 7, windows 8 or windows 10 and can function on 32bit systems. These are basically ground story which consists of only columns without any pattern wall. Which software should i learn as a structural engineer. Structural engineering, analysis, and design software staad. Analysis of building with soft storey during earthquake irjet. In late 2005, research engineers international was bought by bentley systems. The finite element analysis program rfem is a powerful software for quick and easy modeling, structural analysis and design of 2d and 3d models consisting of member, plate, wall, folded plate, shell, solid, and contact elements. Soft storey it is one in which the lateral stiffness is less than 70 percent of that in the storey above or less than 80 percent of the average lateral stiffness of the three storeys above. Pro is the structural engineering professionals choice for steel, concrete, timber, aluminum, and coldformed steel design of virtually any structure including culverts, petrochemical plants, tunnels, bridges, piles, and much more through its flexible modeling environment, advanced features, and fluent data. But, on analysis staad shows the warnings as floor levels are not defined. Pro advanced adds faster, more advanced and complex analysis.
Staad pro is a renowned structural analysis and design software that is used all over the world, and this post is aimed at investigating the analysis of beam and raft foundation using staad pro v8i. Spring mass model with the lateral forces are also plotted for the different buildings. The objective of this paper is to analysis design rc building located in the most active seismic zone region in saudi arabia to mitigate seismic loads. The building having soft storey at any floor is vulnerable for damage during earthquake due to lack of stiffness of soft storey. Take advantage of the compute, data, and collaborative power of the cloud. In such, ground storey possesses lower storey stiffness to that of the upper storeys thereby rendering it to a soft storey. Pro output by including the command print story stiffness in the post.
When used, the program will exclude the effect of any other forms of lateral force resisting structural. Study of base shear and storey drift by dynamic analysis. The structure analysis and design is done using staad. First, is the reduction in spectral acceleration and base shear due to increase of natural period of vibration of structure as in a base isolated structure. Pro is one of the most widely used structural analysis and design software products worldwide. Etabs 2015 torsional irregularity check with seismic loads. Pro, all suggested and ranked by the alternativeto. A soft storey or a weak storey is one in which the lateral stiffness is less than. Pro structural analysis and design free book download staad. Pro to design steel structural elements for qatars luxury alfardan office tower. Mar 11, 2018 primary loads to be considered would be. Staad pro software is used for designing structures, for four earthquake zones.
Staad pro stands for structural analysis and design. A five storey building with a open ground storey is analysed with and without braced type viscous dampers placed at soft storey. Once you learn the principles of how to build a meaningful accurate results structural model in any program, the question of switching and of which specific softwa. Staad pro v8i software is widely used in analyzing and designing structures buildings, bridges, towers, transportation, industrial and utility structures. The soft storey concept has technical and functional advantages over the conventional construction. A study on the effectiveness of bracing systems in soft storey steel. Perform comprehensive analysis and design for any size or type of structure faster than ever before using the new staad. The above irregularity is one of the main reasons of high rise building damages of earthquake. It is one of the effective software which is used for the purpose of analysis and design of structure by the structural engineers. What are loads to be considered in the design of a. Larger storey drift occurs on first floor soft storey than the upper storeys which are stiffer7.
A six storey building for a commercial complex has plan dimensions as shown in figure 1. Mar 01, 20 weak storey should be avoided in buildings where possible in earthquake zones, where large horizontal loads need to be catered for and transferred to the foundations. Unless you are using a nonlinear analysis, the drifts youre getting are elastic, so you increase them based on the. Such variation in storey stiffness could trigger soft storey. Pro is a structural analysis and design software application originally developed by research engineers international in 1997. In the industry we use staad to model and analyse the building, and then design the individual structural members in excel. Seismic response of soft storey on high rise building frame. Most of the existing commercial complexes have this feature in common. Seismic analysis and design of a multistorey building. Civil engineers are using this software to perform 3d analysis and design for any kind of low and high rise structure. Complete your steel, concrete, timber, aluminum, and coldformed steel projects, on time and in. Staad pro software manuals collection includes staad pro technical manual, staad pro v8i for beginners, staad. Planning is done using 3d modeling software the 2011 revitwith the help of auto cad 2014. Soft storey is one in which lateral stiffness is less than.
Staad pro software manuals civil engineering community. The building without soft storey is found to be safer during strong ground motions as compared to building having soft storey at any floor. Feb 25, 2014 soft storey it is one in which the lateral stiffness is less than 70 percent of that in the storey above or less than 80 percent of the average lateral stiffness of the three storeys above. Pro is used to generate a model of a truss, which can be analyzed using the same software. An investigation on the analysis of beam and raft slab. Threedimensional structural software for the analysis and design of building systems. Percentage change in storey shear for the different buildings is also evaluated. Comparison of design results of a structure designed using. Pro output by including the command print story stiffness in the post analysis print commands section. These typical problems have been solved using basic concept of. Mar 02, 2017 rigid diaphragm, drift, vertical irregularities in staad john paul dela rosa. Few standard problems also have been solved to show how staad pro can be used in different cases. Pro for windows, mac, linux, web, software as a service saas and more. Introduction soft story is an open storey, which is not that much capable to resist lateral forces as compared to above non soft storey floors.
Structural engineering forum of india, sefi is a forum that enables and supports interaction among structural engineers and addresses the issues that concern them. How to design multistoried steel structure in staad pro. Preengineered building peb concept is a new conception of single storey industrial building construction. The design methods used in staad pro analysis are limit state design conforming to indian standard code of practice. Bentleys staad pro v8i is a structural designing software used around the globe for this purpose.
In essence, a soft story has inadequate shear resistance or inadequate ductility energy absorption capacity to resist the earthquakeinduced building stresses. Initially we started with the analysis of simple 2 dimensional frames and manually checked the accuracy of the software with our results. A soft story building is a multi story building in which one or more floors have windows, wide doors, large unobstructed commercial spaces, or other openings in places where a shear wall would normally be required for stability as a matter of earthquake engineering design. A comparative study of different configuration of shear. I have specified the check soft storey command in my model in order to tel the program to do the soft storey checks. Arab engineering bureau saved nearly 30 percent in resource hours and lowered project costs using staad. In late 2005, research engineers international was bought by bentley systems staad.
Pro is software for structural analysis and design from research engineers international staad. All the specific results are also shown in the end. Storey it is the space between two adjacent floors. Confidently design any type of structure and share your synchronized model data among your design team, in one integrated set of applications. This report includes the concrete design of beams and columns of a two storey building. Analysis of soft storey building in different seismic. Response spectrum specification as per the indian is. Analysis of soft storey building in different seismic zones by staad.
Shear force, lateral displacement and support reactions, with the help of staad. For more detail, please see in ubc code table 16l oap. A multi storey reinforced concrete building, in haql city, was seismically analyzed and designed using the equivalent lateral force procedure with the aid of sap200 software. Here, we are going to briefly present some practical analysis and design of some reinforced concrete elements using staad pro software, orion software and manual calculations. The last time i had worked with staad pro, their designing module was a bit limited and could not give detailed results. The building is located in seismic zone iii on a site with medium soil. And especially in some country staad pro is used to perform steel structure analysis and design. Modern codes of practice are increasingly recognising the computational power of structural analysis softwares. Static eccentricity ea it is the distance between centre of mass and centre of rigidity of floor 1. However, the price of this force reduction is paid in the form of. Story drifts from staad with dynamic analysis structural. Weak storey could occur where the walls at upper floors are omitted at a lower first or ground floor to create open plan space for retail or communal places. It can be observed that as the height and area of building increases the base shear and storey drift increases.
The design involves load calculations manually and analyzing the whole structure by staad pro. Lateral force developed on building and shear induced on the base of building during earthquake depends on mass and stiffness of structure, irregularity introduced due to soft first storey causes damages on columns when the ground shakes. Faculty of technology, structural engineering department. Soft story checking is only valid for structures having vertical elements in the form of columns and shear wall without opening. It gives the bending moment, axial steel structure so that the design can be done using tapered sections and check for the safety. A typical soft story building is an apartment building of three or more stories located over a ground level with large.
Seismic analysis of multi storey reinforced concrete. For the analysis of building staad pro v8i is used. Soft story collapse building research institute p ltd. Seismic analysis of open soft storey building for different models.
The bentley staad or staad pro software is the first and the best 3d engineering design and design software for the world, and is the end point of any builder software purchase. Due to the modular software concept, you can connect the main program rfem with the corresponding add. Pro is a professional choice for structural engineering in a variety of metal, concrete, wood, aluminum, and cold steel structures for the design of almost any type of instrument, such as a plug. Numbers of beams and columns in each type are given in table 1. Rigid diaphragm, drift, vertical irregularities in staad. Response spectrum analysis as per is1983 in staad pro. Nonlinear time history analysis is carried out using sap2000 software and comparisons are shown in a tabular and graphical format. This forum also aims in aiding professionals from allied fields such as architecture, construction, sociology, planning, conservation and disaster mitigation to interact with. Soft story the story which the latteral stiffness is less than 70% of the stiffness of the story above. Additionally, the story stiffnesses used in calculating story drift or checking soft stories can be added to staad. Evaluation of the storey stiffness due to soft storey of multi storied building considering various models will be presented in final phase of project.
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