Steel Vs Concrete

Evluation Criteria Peb Building Concrete Building Steel Advantage
Building Dimensions
  • Suitable for spans 20-30m. Can sustain much larger spans.
  • Suitable for short span buildings, 5-8m. Becomes difficult and heavy for larger spans.
12%-50% Cost saving for long span steel building
  • Members fabricated in a controlled environment.
  • Precise fabrication.
  • Fabrication done on site.
  • Requires building the reinforcement cage and shuttering work prior to pouring.
90% saving in fabrication time on site.
Delivery and Logistics
  • Can be delivered anywhere in the world.
  • Can be properly sequenced.
  • Might have to build batch plant on site if site is secluded or huge.
Capital Investment saving.
Erection Time
  • Fast erection. Virtually no idle time
  • Slow erection and time consuming.
  • Pouring should take place in limited amount of time. If exceeded, the concrete quality may be jeopardized.
  • The contractor will have to wait for the previous cast to harden (14-28 days) before being able to cast another batch.
50% saving in construction time.
Industrial Applications
  • Can easily handle equipment such as multiple cranes within building.
  • Sways can be controlled.
  • Precision can be achieved during installation.
  • Heavy equipment usage such as cranes is limited.
  • To solve precision problems, contractors use steel I beams and platforms in concrete buildings.
Saving on maintenance cost.
Quality Quality of steel is guaranteed because
  • It is a homogeneous product.
  • Pieces are tailored according to shop drawings.
  • Precise machinery is used for fabrication.
  • It is fabricated under shop control.
  • Quality is not affected by weather conditions
Many factors lead to quality deterioration
  • Concrete is not a homogeneous product
  • Concrete mix ingredient ratios are difficult to maintain.
  • Quality of water used may vary.
  • Weather conditions.
  • Labor experience in pouring.
  • Adequate use of vibrators.
  • Using proper curing methods.
  • Concrete shrinkage.
  • High manpower count may weakan control.
Less time is spent to maintain steel quality.
  • Low man power count needed.
  • Erection cost is low at site
  • Construction cost is high at site
Modulability & Scalability
  • Can change a section of the building or even cancel a section with controlled effort and with little effect on structure stability and functionality.
  • Expansion is easy. Longitudinally expansion is about adding more bays and connecting the secondary members and the sheeting to the old building.
  • Needs a lot of planning and has usually major consequences. Might be even impossible.
  • To expand, the contractor has to build a new structure with foundations, columns and might have to break part of the old structure in order to expand it.
Lower modification cost.
Error Modification
  • Easy to modify on site, even after erection.
  • Modification can be done by cutting, welding or attaching steel pieces.
  • Have to break concrete if modification is necessary.
Consistency and Reliability
  • Strength is assured from design.
  • Steel properties are stable with time.
  • Strength cannot be guaranteed without testing.
  • Concrete properties may change over time and environmental conditions
Seismic Effect
  • Ductility of steel provides flexible behavior under seismic loads. Light Steel structures minimize the seismic effect on the structure.
  • Steel is heavier than concrete but is 18 times stronger. A steel member can hold 6 times its own weight.
  • Poor flexibility under seismic loads. Heavy structures maximize the seismic effect on the structure.
  • Heavy self weight. Large portion of concrete strength consumed to resist effect of its own weight.
  • Show signs of failure when overloaded.
  • Gives chance to fix the problem.
  • No warning signs.
  • May result in disastrous collapse.
  • Steel reinforcement is used to prevent brittle failure.
Steel building requires less costly safety measures.