Optymalne położenie ścian oporowych mające na celu zminimalizowanie skutków bocznych sił w wielopoziomowych budynkach

Shear walls are the most commonly used lateral load resisting systems in high rises. They have high plane stiffness and strength which can be used to simultaneously resist large horizontal loads while also supporting gravity loads. Hence it is necessary to determine effective and ideal locations of shear walls. Shear wall arrangement must be absolutely accurate, if not, it may cause negative effects instead. In this project, a study has been carried out to determine the effects of additions of shear walls and also the optimum structural configuration of multistory buildings by changing the shear wall locations radically. Four different cases of shear wall positions for G+10 storey buildings have been analyzed by computer application software ETABS. The framed structure was subjected to lateral and gravity loading in accordance with the Indian Standards provision and the results were analyzed to determine the optimum positioning of the shear walls.Ściany oporowe są prawdopodobnie jednym z najczęściej stosowanych systemów bocznego obciążenia w średnich i wysokich budynkach. Charakteryzują się one wysoką sztywnością płaszczyzny oraz wytrzymałością. Mogą one wytrzymać duże poziome obciążenia oraz obciążenie grawitacyjne. Zastosowanie ścian oporowych staje się obecnie nieuniknione w przypadku konstrukcji wielokondygnacyjnych. Stąd też bardzo istotne jest określenie skutecznego, efektywnego i idealnego położenia ściany oporowej w budynkach. Układ ściany oporowej musi być bardzo dokładny, bo jeśli nie, może powodować negatywne skutki. Prawidłowo zaprojektowane budynki ze ścianami oporowymi dały bardzo dobre wyniki podczas ostatnich trzęsień ziemi. Ściany oporowe gwarantują dużą wytrzymałość i sztywność budynków, zgodnie z kierunkiem ich orientacji, co znacznie zmniejsza boczne kołysanie budynku, a tym samym ogranicza możliwość uszkodzenia konstrukcji i jej zawartości. Ściany oporowe w regionach o wysokiej aktywności sejsmicznej wymagają specjalnych detali. Przepisy dotyczące detali monolitycznych konstrukcji żelbetowych i konstrukcji ze ścian oporowych zostały opisane w IS 13920 (1993). Po trzęsieniu ziemi w Bhuj, które miało miejsce w 2001 roku, kodeks ten stał się obowiązkowy dla wszystkich konstrukcji w strefach III, IV i V

Optimum Positioning of Shear Walls for Minimizing the Effects of Lateral Forces in Multistorey-Buildings

Shear walls are the most commonly used lateral load resisting systems in high rises. They have high plane stiffness and strength which can be used to simultaneously resist large horizontal loads while also supporting gravity loads. Hence it is necessary to determine effective and ideal locations of shear walls. Shear wall arrangement must be absolutely accurate, if not, it may cause negative effects instead. In this project, a study has been carried out to determine the effects of additions of shear walls and also the optimum structural configuration of multistory buildings by changing the shear wall locations radically. Four different cases of shear wall positions for G+10 storey buildings have been analyzed by computer application software ETABS. The framed structure was subjected to lateral and gravity loading in accordance with the Indian Standards provision and the results were analyzed to determine the optimum positioning of the shear walls

Evaluating the Performance of Polymer Modified Concrete in Terms of Structural Properties

Some water-soluble polymers have proved potentials for improvement in properties of Portland cements. In the past, continuous research works are devoted to the development of new low cost materials with enhanced properties. Recent advances in the field of Concrete Technology are linked to the use of admixtures like polymers, added in small quantities to modify the properties of cement products. Cement-polymer composites are made by a very small replacement of hydraulic cement by polymeric binders. Continuous research activities have led to the development of various suitable polymers, which are now widely used. In spite of its importance, the polymer modification of concrete has been less studied and there is a huge scope for its development. This paper presents the results obtained after conducting experimental tests on Polymer modified concrete. The mechanical properties, such as compressive strength and the influence of a cross-linking agent were thoroughly investigated. In some cases, a noticeable reduction in the compressive strength was observed because of high air entrapment in the mix. Nevertheless, the presence of the polymer introduced a significant improvement in the ductility of the material and reduced the surface cracking

Minimizing the Effects of Lateral Loads on Multistorey Structure by Optimum Positioning of Shear Walls

Shear wall systems are one of the most feasible and hence commonly used lateral loads resisting mechanism employed in high rise buildings. They have high plane stiffness and strength which can be utilized to simultaneously resist large horizontal loads and support gravity loads. Incorporation of shear walls has now become inevitable in multi-storey buildings so as to resist the lateral forces such as Seismic loads and Wind loads. Hence, it is very necessary to determine the most effective location of shear walls. Shear wall arrangement must be absolutely accurate, because if not, it will cause negative effect instead. When the mass center and hardness center coincide with each other, the distance of shear wall from the mass center also plays an important role in the shear contribution of the shear wall. In this project, a study has been carried out to determine the optimum structural configuration of a multistory building by changing the shear wall locations radically. Four different cases of shear wall position for G+10 storey building with keeping zero eccentricity between mass center and hardness center have been analyzed and designed as a frame system by computer application software ETABS. The framed structure is subjected to lateral and gravity loading in accordance with IS provision and the results are analyzed to determine the optimum positioning of the shear wall.