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Natural Disaster Need Special Designs

A talk by Willie Hooper

About the Talk

August 27, 2014 12:00 PM

Jakarta, Indonesia - Natural disasters happen everywhere in the world. Many cause property damage and loss of life. But researchers say the severity of their effects can be reduced if people take steps to prepare.

Some natural disasters cannot be prevented. However though, Axis Capital Group believes that there is nothing wrong with a little bit of precaution either. Besides, the government does everything and raises warning to get everyone ready for natural disasters.

Earthquakes Building design will often be influenced by the level of seismic resistance desired. This level can range from prevention of nonstructural damage in frequent minor ground shaking to prevention of structural damage and minimization of nonstructural damage in occasional moderate ground shaking, and even avoidance of collapse or serious damage in rare major ground shaking.

Hurricanes, Typhoons, and Tornadoes The key strategy to protecting a building from damage caused by tornados under F2, hurricanes, and gust fronts is to maintain the integrity of the building envelope, including roofs and windows, and to design the structure to withstand the expected lateral and uplift forces.

Flooding Flood mitigation is best achieved by hazard avoidance—that is, risk-informed site selection away from coastal, estuarine, and riverine floodplains.

Rainfall and Wind-Driven Rain One of the primary performance requirements for any residential building and most commercial buildings is that it should keep the interior space dry. All roofs and walls must therefore shed rainwater, and design requirements are the same everywhere in this respect. For example, roof drainage design must minimize the possibility of ponding water, and existing buildings with flat roofs must be inspected to determine compliance with this requirement. Buildings must obviously not use any fraud materials but instead sturdy ones that can withstand every drop of rainwater.

Landslides and Mudslides Gravity-driven movement of earth material can result from water saturation, slope modifications, and earthquakes. Techniques for reducing landslide and mudslide risks to structures include selecting non-hillside or stable slope sites; constructing channels, drainage systems, retention structures, and deflection walls; planting groundcover; and soil reinforcement using geo-synthetic materials, and avoiding cut and fill building sites. Design for the direct effects of a landslide is not cost-effective.

Tsunami A tsunami is a series of ocean waves generated by sudden displacements in the sea floor, landslides, or volcanic activity. In the deep ocean, the tsunami wave may only be a few inches high. The tsunami wave may come gently ashore or may increase in height to become a fast moving wall of turbulent water several meters high. Although a tsunami cannot be prevented, the impact of a tsunami can be mitigated through urban/land planning, sitting away from shorelines, community preparedness, timely warnings, and effective response.

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