Abstract
The paper considers large-panel constructive system of multi-storey buildings and its industrial basis creates conditions for intensive volume growth in house construction. Application of hollow-core panels are recommended as floor slabs that allows to increase a distance between bearing walls, to improve planning solutions, and also significantly to increase thermal and sound protection properties of floor discs (coatings). Keyed joints having the highest resistance to shearing forces are used to ensure joint action of the slabs with wall panels. A supporting unit of floor elements in the precast-monolithic constructive system ARKOS by means of concrete keys is considered as a prototype of the considered joint. In order to increase a bearing capacity and improve reliability of joints it is envisaged to reinforce keys with space frames. Improvement of joint units is possible to carry out with due account of total number of the factors influencing on strength. Poltava National Technical University named after Yuri Kondratyuk has developed a general methodology for assessment of bearing capacity in keyed joints which is based on the variational method in the theory of concrete plasticity and reflects specificity of stress-strain state of the failure zone. For experimental verification of this methodology investigations have been carried out with the purpose to test operation of keys when they are reinforced in mid-height and reinforcement is distributed in two tiers. The observed experimental fracture pattern in the specimens has confirmed kinematic schemes accepted for calculations and comparative analysis of experimental and theoretical values points to their closeness. Two-level reinforcement significantly improves plastic properties of concrete keys and excludes brittle failure. The proposed design of the joint unit for floor slabs with wall panels is characterized by the ratio of key dimensions and shape of reinforcing cages in the form of hollow cylinders which ensure higher strength and seismic resistance of a joint.
Highlights
Сivil and Industrial Engineering that allows to increase a distance between bearing walls, to improve planning solutions, and significantly to increase thermal and sound protection properties of floor discs
Keyed joints having the highest resistance to shearing forces are used to ensure joint action of the slabs with wall panels
A supporting unit of floor elements in the precast-monolithic constructive system ARKOS by means of concrete keys is considered as a prototype of the considered joint
Summary
Ответственными звеньями перечисленных выше несущих систем являются узлы соединения (опирания) конструкций перекрытий (покрытий) с колоннами, стенами и между собой. 1. Узел опирания многопустотных плит на монолитный ригель сборно-монолитного перекрытия через бетонные шпонки (а), армированные плоскими (b) и пространственными в виде полой призмы с треугольником в основе (с) или полого цилиндра (d) каркасами шпонок: 1 – многопустотная плита; 2 – ригель; 3 – опалубка; 4 – арматурный каркас шпонки; 5 – заглушка для ограничения глубины шпонки. На Украине существует ряд патентов, касающихся предложений по армированию опорных шпонок плоскими [9] и пространственными каркасами в виде пустотелых треугольной пирамиды [10] и цилиндра [11] Стык имеет большую несущую способность, чем платформенный, что позволяет уменьшить толщину несущих стен и является актуальным для зданий повышенной этажности. Цель данного исследования – усовершенствование конструктивного решения шпоночного соединения многопустотных плит со стенами в индустриальном крупнопанельном домостроении на основе повышения точности оценки несущей способности и обеспечения заданной сейсмостойкости
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