6. Retrofitting Techniques and Solutions

Now, asymmetric buildings with empty pockets are more vulnerable to damage because don't leave these empty pockets; we tried to fill that and that is where these are more stable. The symmetric buildings are more stable, and also when we say about the row house planning; the row house planning also creates wind tunnel effects because the moment your house is one step to another, next to the shore and then it channels the wind and that is where it can damage the edges of the walls or the corners.

Buildings that are asymmetrical (not evenly shaped) and that have empty spaces (vacant areas) are at a higher risk during disasters because these empty pockets don't provide much structural support. In contrast, symmetrical buildings (evenly shaped) are more stable. Additionally, row houses can create wind tunnel effects, which means that when wind flows between them, it can get channeled and become stronger, leading to more damage, particularly at the corners of the buildings.

Think of it like a row of cars parked closely together. If there’s a strong wind, the gap between two cars could create a tiny wind tunnel that could blow debris or even push things more forcefully. Similarly, buildings need to be designed to minimize these 'wind tunnels' to ensure better protection against strong winds.

So, that is where you can even, you know, now even the zigzag planning avoid wind tunnel effect, right. […] The zigzag pattern can also have some control, it depends on how you are actually orienting it and similarly, the long face of the building facing the wind direction.

Implementing a zigzag pattern in building design can help prevent the wind tunnel effect. When buildings are placed in a staggered or zigzag formation, they break the wind’s flow, reducing its intensity. Careful orientation of the buildings to face away from the direction of the prevailing winds can also help minimize damage, as it avoids the long side of the building facing the wind directly.

Imagine a set of hills; if you build houses on the slopes in a zigzag manner rather than a straight line, the wind has to curve around the hills, which reduces its speed and power before reaching the houses. This is similar to how zigzag building arrangements can mitigate wind impacts.

In terms of quality control, it also talks about the material, what are the ratios we have to include. So, when we say about do not use cement and sand to be less than 1.6, okay, 1:6, so for 1 cement and 6 parts of the sand. […] This is a kind of mortar mixes which normally guidelines do recommend and at the end of the day, all these are coming from the proper IS code but these are only thumb rules.

Quality control in construction materials is crucial for a building's stability. For instance, using a cement to sand ratio of 1:6 means for every 1 part of cement, there should be 6 parts of sand. This mixing ratio is critical to ensure the strength and durability of the mortar. The guidelines provided, including the IS code standards, serve as basic rules to help builders create a strong structure.

Think of baking a cake: if the recipe calls for 1 cup of sugar and 6 cups of flour, sticking to this ratio helps ensure the cake doesn't just collapse or taste bland. Similarly, maintaining the right proportions in construction materials helps the building stand strong and safe.

After the recent Kerala floods, architect Benny Kuriakose developed a manual for retrofitting and flood-resistant design for flood-affected areas in Kerala. The Malayalam version is already printed, and the English version is in process. […] Before diving into solutions, he explains how disasters occur and what causes them.

In response to the devastating floods in Kerala, architect Benny Kuriakose created a manual designed to help local communities retrofit their buildings for better flood resilience. Understanding the causes of flooding and damage is essential before implementing solutions, as it provides a context for why certain techniques and designs are needed.

Imagine a doctor diagnosing a patient before prescribing medicine. Similarly, Kuriakose's approach emphasizes understanding the symptoms and causes of building vulnerabilities in order to effectively treat and improve them.

One has to understand the consequences of these disasters and especially, what are the causes; root causes for it. […] For instance, here, you have these normal setup where you have the river level, and all of them have built on top, on the mountains; after the construction of dams, people started construction near the riverbeds.

It's essential to analyze the root causes behind disasters, such as flooding or erosion. For example, in Kerala, some buildings were constructed near riverbeds, especially after dams were built, which led to increased risks during floods. This knowledge helps in planning and designing safer building methods to avoid disaster.

Think of how a flood might affect a garden if it’s planted too close to a river without any barriers—when the river rises, the plants can get washed away. Understanding these risks helps in planning where to plant and what to build, ensuring that the garden (or buildings) are safe from sudden floods.

For example, in architecture, we might have studied shoring and you might have studied about raking shores and underpinning so, these are various techniques which we learn from our architecture building construction subject but then this is one, where you really apply it because this is where, in order to protect this wall and during the restoration process, you need to apply these shores.

Retrofitting involves several construction techniques to strengthen buildings, such as using shoring (supports for walls) or underpinning (reinforcing the foundation). During repair and restoration efforts, these methods provide temporary support, ensuring that the structure remains stable while being worked on.

Imagine a person holding up a car while someone else changes a tire. The person holding the car is like the support structures used in retrofitting—allowing the main task (changing the tire or repairing the wall) to be performed safely without the risk of the heavy car (or wall) collapsing.

For instance, if it is a smaller crack what to do is; we make a V groove and removal of loose particles, then insertion of stone chips, so there is a Gelatin technique sort of thing, you keep the stone chips and then, then fixing a chicken wire mesh all along and then filling with the mortar and non-shrinkable cement grout.

When dealing with smaller cracks in a building, a common approach is to create a V-shaped groove in the crack, remove any loose debris, insert stone chips, and then reinforce it with a chicken wire mesh. Finally, this area is filled with mortar and non-shrinkable cement to ensure it stays intact.

Think of it like fixing a crack in a garden pot. You would clean out the crack, fill it with a strong filler to give it strength, and perhaps reinforce it with mesh to keep everything intact. This ensures that the pot (or wall) can hold up without falling apart.

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