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Past Year Questions: Matrix Method of Structural Analysis | Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE) PDF Download
Q1: A prismatic fixed-fixed beam, modelled with a total lumped-mass of 10 kg as a single degree of freedom (SDOF) system is shown in the figure. [2021, Set-2]
If the flexural stiffness of the beam is 4π2kN/m, its natural frequency of vibration (in Hz, in integer) in the flexural mode will be _______
Ans: 10 to 10
Sol: Give Data:
m = 10 kg
K = 4π2 x 103
Natural frequency,
Q2: Employ stiffness matrix approach for the simply supported beam as shown in the figure to calculate unknown displacements/rotations. Take length, L = 8 m; modulus of elasticity, E = 3 × 10 4 N/nm 2 ; moment of inertia, I = 225 × 1 0 6 m m 4
[2021, Set-1]
Ans: 100 to 130
Sol:
By stiffness matrix method
Step-1 : Generation of stiffness matrix
Column-1
k11 =
k21 = 
Column-2
Stiffness matrix [k] = 
Step-2: Calculation of unknown Nodal displacements (ΔBθB)
Using [P] = [k] [Δ]
⇒ 
On solving
∴
= 118. 519 mm ≃ 119 mm
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FAQs on Past Year Questions: Matrix Method of Structural Analysis - Topic wise GATE Past Year Papers for Civil Engineering - Civil Engineering (CE)
| 1. What is the Matrix Method of Structural Analysis? |  |
| 2. How does the Matrix Method differ from traditional methods of structural analysis? | |
Ans. The Matrix Method differs from traditional methods like the Moment Distribution Method or the Static Equilibrium Method by utilizing matrix algebra to simplify the analysis of structures. While traditional methods often rely on manual calculations and simplifications, the Matrix Method provides a systematic approach that can handle large, complex systems efficiently, allowing for computer-based analysis which enhances accuracy and reduces time.
| 3. What are the primary steps involved in using the Matrix Method for structural analysis? | |
Ans. The primary steps in the Matrix Method include:
1. Formulating the global stiffness matrix for the structure.
2. Assembling the global stiffness matrix using the individual element stiffness matrices.
3. Applying boundary conditions and loads to the system.
4. Solving the system of equations to find nodal displacements.
5. Calculating internal forces and reactions based on the obtained displacements.
| 4. What types of structures are best suited for analysis using the Matrix Method? | |
Ans. The Matrix Method is particularly well-suited for analyzing complex structures such as multi-storey buildings, space frames, and trusses. It is advantageous for structures with irregular geometries, varying material properties, and those subjected to dynamic loads, as it can effectively manage the computational complexity involved in these scenarios.
| 5. What software tools are commonly used for performing Matrix Method analysis in civil engineering? | |
Ans. Common software tools used for Matrix Method analysis include SAP2000, ANSYS, ETABS, and STAAD.Pro. These programs utilize the principles of the Matrix Method to provide engineers with powerful capabilities for modeling, analyzing, and designing various types of structures efficiently and accurately.
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