Analysis Of Multi-storey Buildings Research Articles

Efficient seismic analysis of multi-story buildings

The equivalent static force procedure and the response spectrum analysis method are widely used for seismic analyses of multi-story buildings. The equivalent static force procedure is one of the most simple but less accurate method in predicting possible seismic response of a structure. The response spectrum analysis method provides more accurate results while it takes much longer computational time. In the response spectrum method, dynamic response of a multi-story building is obtained by combining modal responses through a proper procedure such as SRSS or CQC method. Since all of the analysis results are expressed in absolute values, structural engineers have difficulties to combine them with the results obtained from the static analysis. Design automation is interrupted at this stage because of the difficulty in the decision of the most critical design load. Pseudo-dynamic analysis method proposed in this study provides more accurate seismic analysis results than those of the equivalent static force procedure since the dynamic characteristics of a structure is considered. And the proposed method has an advantage in combination of the analysis results due to gravity loads and seismic loads since the direction of the forces can be considered.

Stiffness matrices for simple analogous frames for shear wall analysis

The global stiffness matrix of two types of analogous frames developed by Stafford Smith and Girgis for shear wall analysis are presented. These matrices can be used in the analysis of multistorey buildings using 2D or 3D frame programs. The matrix entries are given in closed-form relations which are determined using symbolic manipulation. For the 3D element they express the transformation from the local to global system as well as the modification due to the remote displacements of the diaphragms. Numerical results are presented by using full-width elements in every storey. Discrepancy of the results, compared with that obtained using the standard wide-column analogy, are presented.

Interactive elastic and inelastic response spectrum analysis of multistorey buildings

An interactive menu driven microcomputer program is presented for elastic and inelastic earthquake response spectrum analysis of multistorey and multibay buildings. The program is written in Advanced BASIC on an IBM Personal Computer with one disk drive. The program can perform the following:

Inelastic analysis of steel frames for multistory buildings

A method has been developed directed towards the analysis of multistory buildings beyond the elastic limit and also considering geometrical non-linearities. The plastic zones are concentrated at the ends of the members and a single stiffness matrix has been developed which makes it possible to describe the behaviour of the member in the presence of plastic hinges at one or the other or at both ends. The solutions are obtained using an incremental-iterative method and a special algorithm, which takes into account the iteraction between the member end forces during the elasto-plastic phase, guarantees the equilibrium of each element and at the same time compels the stress point to respect the yield condition. The method has been codified in a computer program even for the study of very large structures. Some examples have been given to demonstrate the validity of the method and the reliability of the code.

Equivalent Frame Analysis for Lateral Loads

The equivalent frame method for analyzing reinforced concrete buildings described in the ACI Building Code Requirements (ACI 318-77) is suitable for analyzing single stories for gravity loading only. A new procedure that permits using the equivalent frame concepts for the analysis of multistory buildings for both lateral and gravity loads is described. Limited verification studies show the method predicts lateral deflections that generally agree with measured deflections. Comparisons of the new analytical procedure with conventional plane frame analyses made using effective slab widths are given. Problems and limitations in applying the method in plane frame and space frame analyses are reviewed.