Masonry houses that do not have pillars are usually found in areas with low seismic activity, in areas around cities and are usually detached houses. Their height usually does not exceed two floors. The bond of the mortar to the bricks is not strong enough to keep them cohesive in strong seismic activity. The construction (senage) of double perimeter reinforcement with reinforced concrete up and down at the height of the windows, strengthen them significantly. But the absence of vertical reinforcement makes them vulnerable to earthquakes. There are structures that place upright prestressing tendons, which are placed between the double masonry and penetrate it vertically. The imposition of compressive forces on the cross section of the masonry only has positive results because it keeps the masonry in coherence. The pre-tension in these constructions is applied between the roof and the base. As rigid prestressed structures, they lower high torques at the base. These torques easily bend and break the concrete on which they rest. My suggestion is to create deep foundations firmly anchored to the ground using the patching mechanism of the patent and to stretch the tendons between the roof and the bottom of the deep foundation. In this way the seismic intensities will be deflected into the ground, preventing the stress of the cross-sections of the base concrete.
Interesting question dear Prof.
Your idea based on turning a house into rigid mass in order to seismic protection. But, the majority of people cannot afford additional cost of such a huge foundation in addition to prestressing process. My sincere gratitude
Dear Abdullah Sikar Al-Issawi
First I am not a professor! I would like to be but I am not.
Not building a very large base that raises the cost of construction.
The anchoring mechanism is placed in the depths of a borehole and with the help of a hydraulic tractor, it expands towards the slopes of the borehole, compresses them, creating an anchor in the ground.
Then we fill the drilling hole with concrete.
This anchoring process creates good foundation conditions because it compacts the ground in all directions. Conclusion.
I made a base in depth which removes the base in width.
So there is no extra cost.
The construction method just needs to change.
Seismic actions cause a horizontal load on the structure. Therefore, it would be important to try to avoid structural masonry constructions in these regions, considering that their behavior under vertical loads is significant, however, with reduced efficiency to horizontal actions. I believe that increasing the stiffness mitigates this effect.
Dear João Manoel de Freitas Mota
The lateral seismic loads, cause overturning torques of the vertical elements which are transported to the cross sections around the nodes which react with reverse torques.
The result in a strong earthquake is that all sections are strained until they break. The pre-tensioning of the walls + anchoring to the ground prevents the overturning moment and the stresses in the cross-sections, because they divert the seismic loads in the ground.
There is also the shear force. The prestressing on the wall has beneficial effects on the shear forces.
So you are right to say that it is good.
Creo que los antiguos ingenieros/arquitectos resolvían la estabilidad de edificios bajos de fábrica con sistemas sencillos, sensatos y de bajo coste. Solo hay que estudiar lo que hicieron de forma, en general, de un modo satisfactoria.
querido Manuel Durán Fuentes
Tanto los antiguos como los jóvenes han construido edificios con construcción antisísmica. Lo que he inventado es nueva tecnología y es la mejor tecnología sísmica actual. Ningún ensayo en el mundo puede sostenerse sobre esta base sísmica del video de 2.5 g terremoto natural.
https://www.youtube.com/watch?v=RoM5pEy7n9Q
https://www.youtube.com/watch?v=zhkUlxC6IK4
https://www.youtube.com/watch?v=IO6MxxH0lMU
Muchas técnicas de construcción antiguas no han sido superadas por las nuevas, son más sostenibles, económicas y funcionales. Me dedico desde hace 35 años a la restauración y consolidación de puentes de fábrica de piedra de diferentes épocas en España (casi un centenar de puentes romanos, medievales, renacentistas, de los siglos XVIII, XIX y XX) y le puedo asegurar que ciertas soluciones constructivas que tuve que afrontar las resolví con técnicas constructivas romanas y medievales. Le invito a entrar en la página web de ingeniería romana donde puede ver algunos artículos sobre este tema: traianus.net. Atentamente
Congratulations Professor Manuek Fuentes. I also share exceptionalities and interpreted context.
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