Unimelb Construction Design A2 2021

ABPL 30041 - Construction Design, 2021 Sem 2 Assignment 2

Model: ALL PRIMARY STRUCTURES FROM FOUNDATION TO ROOF (Zone D) Ying Lee - 1068215 Tutorial 5 Tutor: Zeljko Trkulja At Studio Link: https://at.studio/t05abpl30041-21-sm2#model=2cfb1bd00fee-11ec-ac24-57b9ee64828e

1. Site Overview

NORTH-WEST ISOMETRIC

NORTH-EAST ISOMETRIC

Scale - 1:20 on A1

1. Site Overview 40MPa Concrete 32MPa Concrete 15MPa Concrete

Prevailing Wind

SOUTH-WEST ISOMETRIC

SOUTH-EAST ISOMETRIC

Scale - 1:20 on A1

2. Post-tensioned Slab

ONE WAY SLAB: 2 End Beam Support, Slab Span, Permanent and Temporary Formwork

2. Post-tensioned Slab

Area provisioned for services installation

ONE WAY SLAB: Tensioned Tendons, Reduced Slab Depth For Installation Of Services

2. Post-tensioned Slab

POST TENSIONED SLAB: Cracking on Exposed Surface of Concrete due to Lack of Top Reinforcement (red)

2. Post-tensioned Slab

LIVE END - Top Stressing Pan, Grout Tube

POST TENSION SLAB

DEAD END - Onion End to increase bond with concrete

3. Pre-Cast Panels

LOAD TRANSFER: Uniformly Distributed Load from Pre Cast Panels into Foundation

3. Pre-Cast Panels

PC 11

STRUCTURAL DISCONTINUITY (Connection with floor) Grout Tube and Shims

PC 13

STRUCTURAL DISCONTINUITY (Connection with Panels) Steel Cast In Plates

3. Pre-Cast Panels

Bending direction

Slenderness ratio (height : thickness) = 42:1

h

Optimum Stable Slenderness ratio = 35:1

PC11 t

SLENDERNESS RATIO (without FF slab)

3. Pre-Cast Panels

Bending moment resisted

h

Rigid Connection

FF Post-tension Slab

First floor slab provides support at mid span of pre cast panel, reduces the slenderness ratio to prevent bending

Slenderness ratio (height : thickness) = 21:1 h

PC11 t

SLENDERNESS RATIO (with FF slab)

3. Pre-Cast Panels

Concrete Expansion Direction Concrete Shrinkage Direction

PANEL REINFORCEMENT

PERIMETER BAR - dealing with thermal expansion / shrinkage

REINFORCEMENT MESH POSITION towards the edge

3. Pre-Cast Panels

CONSTRUCTABILITY - Absence of Edge Chamfering

CONSTRUCTABILITY - Pop up Props

4. Connection Joints Prevailing Wind Prevailing Wind

Prevailing Wind

Structural Deflection

Rigid Connection Point

RIGID CONNECTION - Shear Wall to resist lateral load (wind load), supporting frame stability

4. Connection Joints

Concrete Cover to prevent corrosion of steel

RIGID CONNECTION - Recessed Cast In Plate Connecting Steel Column and FF Slab, Connection bars (red)

4. Connection Joints

Cleat Welded onto Steel Beams

RIGID CONNECTION - horizontal plane rotation resisted

FLEXIBLE CONNECTION - supported with cross bracing

FLEXIBLE CONNECTION - vertical plane rotation slightly resisted

5. Construction Failure

BUKCLING: Concrete long column (lack of ligatures)

BUKCKLING: Steel column (failure in connecting nogging)

6. Building Envelope Design

First Floor Plan

Section D (showing similar area as the investigated)

6. Building Envelope Design

Redesigned Building Envelope Area

PROPOSAL - CONCRETE BALONY: • Activate the space in between the collaborative space external wall and the external screening • Provide extra outdoor access for the users on the first floor • Improve view to the outside • Improve interaction between the users inside and outside

PROPOSED AREA: First Floor Collaborative Space

6. Building Envelope Design

Aluminium Frame Sliding Door

Double Glazing

Edge Recess (Internal slab higher than balcony)

Internal View

6. Building Envelope Design

Flat perforated screens replacing folded screens to avoid sharp edges

Framed View using screens

Rearranged screens to create balustrade

External View

6. Building Envelope Design

Flat perforated screens Aluminium frame sliding door

Edge Recess to prevent moisture ingress

Extension of Post tensioned tendons

CANTILEVERED FLOOR SLAB: Post tensioning and edge recessing