Home > Materials Specifications

Traffic Analysis for Lift, Positioning of Lift, Population in a Building, Calculation of Time Factors

Er. Parbhakar Dwivedi
0
 

       

The need of traffic analysis has gained importance with the increase in the number of stores in the building, increase in the plan area of the building. The design of lift system thus becomes very complex when compared to the lift system requiring a single lift. The ill-fated World Trade Center had 110 floors and consisted of 58 lifts. The complexity with which the lift system must have been designed can be understood from the fact that the passenger who had to attend his office on 108th or 110th floor must feel confident both physiologically and psychologically.

The traffic analysis is a tool to determine the speed, numbers and size of lift required to take care of all these factors.

The importance of close liaison between lift designers, architect and building contractor is the key to a successful design of the system and hence building.

1. Positioning of Lift

The first matter for consideration is the position to be occupied by the lift and lift-well. The main requirement being that users will be able to pass quickly from the building entrance to the lifts and that the lift exiting on various floors will be as near as possible to the centers of population of the floors.

Particular attention must be given to the traffic due to basement parking area, canteen and conference rooms. If the building has one main street entrance, the passenger lifts should be arranged adjacent to each other in a single bank and conveniently situated with regard to the entrance.

From the lift service aspect, the bank should not be arranged in two sections, i.e. one on each side of a central staircase. This practice is sometimes adopted for appearance or to satisfy architectural requirements. With a single bank, a common machine room can be used and so simplify maintenance. It is easier to arrange lift interconnection facilities and group control and the resultant service is better than if the lifts are separated.

If the building has two main entrances, two banks of lifts are necessary, the number in each bank being governed by the number of passengers that will be expected to use each entrance. Although the lift entrances are usually near the stair-way, care should be taken in the design to ensure that persons intending to use the lifts are kept clear of those who wish to use the stairs.

The design of lift installation is governed very largely by the type of building which it has to serve.

2. Population in a Building

To know the requirement of elevators it is essential to assess the Population in a Building. In national building code, occupant level for various types building is given as follow.

If we know how many people will require elevator service within a given period of time, the task of providing that service is one of time and motion study.

Occupancy in a Building

S. no. Occupancy Occupant load gross area in m²/person
i. Residential 12.5
ii. Educational 4.0
iii. institutional 15
iv. Assembly
a. With fixed or loose seats and dance floor. 0.6
b. without seating facilities i/c dining rooms 1.5
v. Mechantile Street floor and sales
a. basement 3
b. Upper sale floors 6
vi. Business and industrial 10
vii. Storage 30
viii. Hazardous 10

It embraces many variables, one of the most important being passenger reactions to elevators.

Calculation of Time Factors

To calculate the total time for an elevator trip, a practical procedure is to break the trip down into its components. A two stop elevator travelling one floor of height 3.05 m is considered here. As soon as a passenger arrives inside a building and presses call button, the following time factors come into play till the passenger leaves the elevator.

A. Passenger going up

Door opening time : 0.5 sec.

Passenger entry time : 2 sec.

Door closing time : 2 sec.

Car travel one floor : 75 sec.

Door opening time : 0.5 sec.

(As the doors can start opening before the elevator has finally stopped, hence time of opening is taken 0.5 sec. here).

Passenger leaving time : 1.2 sec.

B. Elevator going down to pick up second passenger.

Door closing time : 2 sec.

Car travel one floor : 75 sec.

Handily Capacity and no. of lifts described in separate topics

Sponsored

PD Consulting Engineers Pvt. Ltd. Transforming construction for a new generation "Cost, Quality & Project management"

QS & Cost management, Bill Checking / Audit, Technical Auditors, Valuation, Contract and Tendering, Project Management, Project Planning, Quality Control, Consulting Engineers, Structural Consultancy

Close


Comment:

Name:

Email:

Civil N Construction Blog



Relevant Topics

Binding Wire Consumption Finish Sizes Tolerances Tensile Wrapping Bend Test Permissible Defective

Tar Classification Of Tar

Reclaimed Rubber Advantages Disadvantages Uses Of Reclaimed Rubber

Comparison Between Asphalt Bitumen Tar

Compounding Of Rubber Compounds Used For Natural Synthetic Rubber

Pitched Roof Coverings Sheets Comparison Between Ac Gi Sheets

Uses Of Rubber Consumption Of Rubber For Various Items

Turpentine Properties Of Turpentine Uses

Properties Of Rubber

Rubber Types Of Rubber

Forms Of Rubber

Vulcanization Effects Of Vulcanization

Sound Absorbent Materials Classifications Materials Are Used For Sound Absorbent

Guidelines For Use Plastic Emulsions Paints

Types Of Paints

Painting On Different Surfaces Woodwork Metal Etc

Notes For Guidance In The Process Of Painting

Polyurethane Sealant

Precautions Taken In The Design Installation Of Pvc Pipes

Polysulphide Sealants

Preventive Measures For Corrosion

Structural Adhesives

Moulding Compounds Types

Advantages And Disadvantages Of Pvc Pipes

Bonding Agents Cement Based Slurries

Biodegradable Plastic Its Advantages Disadvantages

Adhesives Difference Between Sealant And Adhesive

Application Of Epoxy Adhesive

Non Structural Adhesives

Wall Paper Whitewashing Colourwashing

Defects In Painting

Ingredients Of A Distemper Process Of Distempering

Applications Of Frp In Building Industry

Classification Methods Of Polymerization

Distempering Properties Of Distempers

Properties Of Plastics

Processes Involved In The Fabrication Of Articles Of Plastics

Selection Of Material For Injection Grouting

Plastics Composition Of Plastic

Pvc Pipes In Buildings

Properties Of Frp Fibre Glass Reinforced Plastic

Materials Commonly Used as Sealants

Silicone Sealant

Classification Of Sealants

Types Of Varnishes Process Of Varnishing

Various Types Of Grouting Materials

Sealant Consistencies

Uses Of Plastics

Failure Of Paint

Desirable Properties Of Sealant

Bonding Agent Between Old And New Concrete

Varnishing Characteristics Of An Ideal Varnish Ingredients

Fibre Glass Reinforced Plastic Frp Principal Methods

Sealants Functions Of Sealants Procedure

Preventive Measures For Corrosion

Classification Of Sealants

Sealant Consistencies

Desirable Properties Of Sealant

Sealants Functions Of Sealants Procedure

Cold Twisted Deformed Bars Ctd Bars Disadvantages

Magnetic Properties Of Steel

Composition Of Cast Iron

Metals Categories Ferrous Metals

Market Forms Of Steel Steel Available In Market

Use Of Wrought Iron

Factors Influencing Corrosion

Corrosion Of ferrous Metals Non Ferrous Metals

Uses Of Cast Iron

Metal Corrosion Types Of Corrosion Effect Of Corrosion

Heat Treatment Processes Of Steel

Mechanical Treatment Of Steel

Precautions In Using Mortar

Defects In Steel

Pig Iron Manufacture Of Pig Iron

Prevention Of Corrosion Of Steel In Concrete

Forms Of Corrosion

Selection Of Mortar As Per Nature Of Work Type Of Mortar

Nature And Properties Of Metals

Ribbed Hysd Bars High Yielding Strength Deformed Bars

Defects In Wrought Iron

Types Of Pig Iron

Thermo Mechanically Treated Tmt Bars Why Prefer Tmt Over Hysd Bars

Causes Of Corrosion

Defects In Metal Casting

Properties Of Engineering Materials

Is Classification Of Lime

Rock Forming Minerals

Comparison Between Lime And Hydraulic Lime

Physical Properties Of Engineering Materials

Common Building Stones Of India

Uses Of Stones

Mechanical Properties Of Materials

Physical Classification Of Rocks

Classification Materials Based Upon Their Uses

Chemical Classification Of Rocks

Qualities Of Good Building Stone

Lime Classification Of Limes

Textures Of Structure Of A Rock

Classification Of Rocks

Factors Of Corrosion Of Reinforcement

Precautions While Using Epoxies

Physical And Mechanical Properties Of Polymer Modified Mortar Concrete

Special Materials For Repair

Essential Eequirements Of Repair Materials

Classification Of Polymeric Modifiers

Deleterious Effects Of Aggressive Chemicals

Causes Of Deterioration Of Concrete Structures

Application Of polymer Modified Mortar concrete Pmm Pmc In Repairs

Corrosion Of Reinforcement Explained

Advantages Of Using Epoxies As A Repair Material

Types Of Materials Available For Repair

Application Of epoxy Based Materials In Repairs

Gauge Type of Mechanical Gauges

Specifications for cement, Specifications for physical properties of Portland cement

Introduction of Cement, Types of cement

Construction Materials- Introduction, Classification of engineering material, Properties of Engineering Materials

Lift Design Important Factors Traffic Constraints

Classification Of Lifts Rope Hydraulic Lift

Water Requirements For Sprinkler Systems By pipe Schedule Hydraulic Method Calculation

Operating System Automatic Operation Full Selective Collective Duplex Collective

Spacing Area Of Coverage Of Sprinklers Maximum Minimum Distance Between Sprinkler

Lifts Types Of Lifts

Hydraulically Most Demanding Area

Water Requirement For Sprinkler System

Types Of Systems Of Sprinklers

Traffic Analysis For Lift Positioning Occupancy Calculation Of Time Factor

Hydraulic Elevators

Essential Components Of Lifts Elevators Brakes Hoisting Rope Motor Counter Weights

Power Control Ac Resistance Control Variable Frequency Drive

Classification Of Occupancies Firefighting

Important Definition For Sprinkler Firefighting

Classification Of Lift According To Interiors

Pump Capacity Water Storage Requirement

Sprinkler Types Upright Pendant Sidewall System

Piping Of Sprinkler System

Important Points Related To Pipe Selection Laying

Selection On Temperature Rating

Automatic Sprinkler System

Dimensional Structural Requirements For Lift Tolerance Allowed In Structure

---NNNNNNNNNNNNNNNNNNNNNN

Basic Principles Of Water Supply Drainage And Sanitation

Water Supply Requirements For Buildings

Protection Of Water Supply

Estimate Of Demand Load Of Water Supply

Design Of Distribution Systems Of Water Supply

Water Supply Materials Fittings And Appliances

Colour Codes For Different Types Of Water Pipes

Important Water Supply Related Definitions

Consideration For Design Of Water Supply

Water Supply Fixture Units (wsfu) For Ifferent Fixtures With Minimum Pipe sizes

Storage Of Water

Water Sources And Quality

Maximum Flow Rate And Flush Volumes

Sponsored

PD Consulting Engineers Pvt. Ltd. Transforming construction for a new generation "Cost, Quality & Project management"

QS & Cost management, Bill Checking / Audit, Technical Auditors, Valuation, Contract and Tendering, Project Management, Project Planning, Quality Control, Consulting Engineers, Structural Consultancy

Close