Design Of Tall Structures

Discuss the effects of wind loads on tall structures by considering factors like wind speed, building shape and aerodynamic considerations.

Discuss the safety measures and design considerations employed to ensure that tall structures can withstand static loads without deformation or failure.

Explain how seismic loads impact tall buildings and the methods used to design earthquake-resistant structures?

Explain the fundamental characteristics of wind forces acting on tall structures. What are the main factors influencing wind loads on buildings?

Discuss specific approximate methods commonly employed in structural engineering for estimating wind loads and seismic forces.

Explain how gust factors vary for different types of buildings and locations?

Define shear walls. What are the key design considerations to be taken when designing shear walls in high-rise buildings?

Define tabular structures and their application in architectural and engineering contexts.

Describe different types of frames used in building construction including moment frames and braced frames.

What are the primary structural considerations in the design of industrial chimneys? Discuss factors such as wind loads and material selection.

Design a chimney having a height of 80 m using following data. Also check the stresses at base in bars

i) External diameter at top = 3.0 m

ii) External diameter at base = 5.0 m

iii) Shell thickness at top = 200 mm

iv) Shell thickness at base = 500 mm

v) Wind Intensity = 2.0 kN/m² throughout

vi) Thickness of fire brick lining = 100 mm

vii) Air gap = 100 mm

viii) Temperature difference = 50 °C

ix) Coefficient of thermal expansion = 10 × 10⁻⁶/ °C

x) Es = 2.1 × 10⁵N/mm²

xi) Density of brick lining = 20 kN/m³

M 30 grade of concrete and Fe 415 grade steel.

A reinforced concrete chimney 85 m high above ground has an outside diameter of 5.4 m. The thickness of the shell is 20 cm throughout. Vertical steel is taken as 1.2 % of the cross sectional area throughout. The total wind load above the base may be taken as 300 KN. Find the stresses developed due to wind and dead load at the base of chimney. Use M25 concrete and Fe500 steel.

What are the key considerations in modeling tall structures for structural analysis?

Analyze a well-known tall building (e.g., Burj Khalifa, Shanghai Tower) and discuss the modeling techniques used during its design and construction phases.

Write a short note on any two:

Behavior of tall structures under static loads

Characteristics of Wind Forces

Ductility and reinforcement details at joint

Tabular Structures