Response Spectrum Curve

The infrastructural boom during last decade as resulted in construction of many high rise structures in all mega cities Due to the existence of architect and structural designer have provided floating column in many location in structure. The building become vulnerable to earthquake hazard due to improper way of flow of earthquake force to ground due to discontinuity in the form of floating column brought into structure floating column provided at some location such as balcony result in close loop and redistribution of moment and forces may prove to be beneficial in restricting dimension of beam and column it may also hell in achieving in desire economy. The present paper deals with comparison of axial forces, shear forces, moment, torsion and displacement in selected few columns & beams in the structure with or without floating column in four zones through different graphs the comparison is explain in the paper.

Abstract: the frequent occurrence of earthquakes around the world has heightened the need for studying the seismic performance of existing structures according to code of practice. This concept has become an urgent issue in egypt especially after hitting a dramatic earthquake to cairo in 1992. The objective of this research is to assess the seismic performance of an existing shear wall residential building located in cairo. Both dynamic response spectrum (rs) and equivalent static force (esf) methods are used in the seismic analysis. The design rs curve suggested by the egyptian code (ec) for seismic design is utilized to perform the dynamic analysis. The response analysis of the building under the acting seismic loads has been performed using etabs, universal finite element analysis software for dynamic analysis. The entire work has been carried out in two stages in order to rescale the dynamic base shear. In the first stage, the built three dimensional building model has been subjected to the static and dynamic earthquake loading following egyptian code guidelines and hence the obtained static and dynamic base shear are compared. The second stage is concerned with scaling the obtained dynamic base shear and reloading the model as the first stage. The considered responses are expressed in terms of floor displacements, shear forces at each floor level, base shear and base moment. Moreover, results from numerical simulations, for storey torsional irregularity ratios are presented for the considered static and dynamic analysis methods. The results of the study show significant differences in building's responses obtained using esf and rs analysis methods. It has been found that the application of static method in a specified direction results in responses in the same direction. However, the applications of dynamic rs method induces response in both directions regardless the direction of loading.
Keywords: Equivalent static force, response spectrum, base shear, Egyptian code.
Title: Response Analysis of Multi-Storey RC Buildings under Equivalent Static and Dynamic Loads According to Egyptian Code,
Author: Sayed Mahmoud, Waleed Abdallah
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
Research Publish Journals

The Techniques used in the field of Construction works are improving day by day. The construction of High-rise buildings in Metro cities nowadays have much importance, in-order to fulfill all the necessary needs to be achieved during a Construction process within the limited space available. One of the main drawback is the formation of Vertical irregularity in buildings. This can be minimized by the installation of Transfer floors in the structures. The transfer floor is the floor system which supports vertical as well as lateral loads and transfer it to different underneath systems whose above portion can be used for residential as well as office purpose while below portion can be used for malls, parking etc... The high-rise buildings are analyzed by Response spectrum analysis using the structural software for building analysis ETABS 2016 software. The analyzed models have transfer slab system at different floor levels i.e. at the odd floor levels of the building.

This paper presents a study of finding the most effective position of RC structural
walls in an RC building to resist with seismic load. Structural walls without any opening
are used. By using Etabs, 5 models are created. Model 1 does not have any structural
wall. Model 2, 3, 4 and 5 consist of structural walls in different positions and they are
placed symmetrically in the plan view of the building. Story displacements, story-drifts
and overturning moments in x and y-directions are checked and compared to each other
to find the model which provides the highest stiffness. The calculation follows DPT
1302-61 code and Response spectrum equivalent static analysis method

This paper presents a study of finding the most effective position of RC structural
walls in an RC building to resist with seismic load. Structural walls without any opening
are used. By using Etabs, 5 models are created. Model 1 does not have any structural
wall. Model 2, 3, 4 and 5 consist of structural walls in different positions and they are
placed symmetrically in the plan view of the building. Story displacements, story-drifts
and overturning moments in x and y-directions are checked and compared to each other
to find the model which provides the highest stiffness. The calculation follows DPT
1302-61 code and Response spectrum equivalent static analysis method.

Seismic analysis of a multi-story Reinforced concrete frame is analyzed under moderate earthquake loads as an application of seismic hazard and in accordance with the seismic provisions proposed in IS: 1893-2002 to analyze the performance of existing buildings if exposed to seismic loads. The frame was analyzed using the response spectrum method to calculate the seismic displacements and stresses. The behavior of Multi-story building of regular and irregular plan configuration under earthquake is complex and it varies of wind loads are assumed to act simultaneously with earthquake loads. The study of this research mainly emphasize the structural behavior of multi-storey building for different plan configuration such as regular building along with L-shape and I-shape. In this modeling of G+ 24 storey RCC framed building is studied for earthquake load using STAAD-PRO V8i. Assuming that material property is linear static and dynamic analysis is performed. These analyses are carried out by considering different seismic zones (III and V) and for each zone the behavior is assessed by taking three different types of soils namely Hard, Medium and Soft. Post analysis of the structure, lateral displacements, story drift, base shear, maximum bending moment and design results are computed and then compared for all the analyzed cases. Designs of these structures in all cases are also done to obtain the most economic structure above all the cases.

Cloud computing gives a rich set of IT services that are provided to a customer over a network on a leased basis and with the flexibility to rescale or down their service requirements. Usually Cloud Computing services are given by a third party provider who owns the infrastructure. Cloud Computing holds the potential to eliminate the necessities for high quality infrastructure. Those components are virtualized computers. This would allow multi-fold increase within the capacity and capabilities of the present and new software. The resources can be dynamically allowing also for an optimum resource by a pay-per-use model it means customized Service Level. The user can access the data from anywhere just with the help of an internet connection. To access this computing, the user should be authenticated through by providing their identification credentials like Userid and password for security purposes. In a cloud computing environment, the complete data resides over a group of networked resources, enabling the info to be accessed through virtual machines. Despite the potential gains achieved from the cloud computing, the organizations are slow in accepting it thanks to security issues and challenges relevant to it. Security is one in every of the main issues which hamper the expansion of cloud. There are many challenges also there for adopting cloud computing like well managed service level agreement (SLA), privacy, interoperability and reliability. This research paper presents the main concept of cloud computing, the various cloud models and therefore the overview of the cloud computing architecture. It simply states that cloud computing means accessing, retrieving and fetching the data and programs over the internet rather than the computer's hard disk.

Use of bracing for constraining the structure is in trend, so there is need of innovating implicit and coherent bracing
system which is able to withstand against lateral forces which will play vital role in design of high rise steel structure. The
bracings provide continuous load path and adequate stiffness. If bracing system used in combination then it will perform in
accordance to the coalescence .The following probe targets at calculating effect of seismic loading on 18 storey regular bare steel
framed building using ETABS software. This buildings adapted different types of combination of bracings such as X&V bracing,
V& Chevron bracing, K&X bracing and Megabracing, The ensuing interpretation is done by static equivalent method and
Response spectrum method for 18 storey steel framed structure by using analytical software E’Tabs with reference of
IS1893:2016 with wind analysis with reference to IS875(part3):2015. Analysis is of each combination of frame is carried out
and studied the comparatively studied in terms of lateral displacements, storey shears, storey drifts in different directions. In two
methods of analysis results in regular braced models with composite column section and among other, the system which showed
better resistance to seismic forces than the other specified bracing systems is interpreted.