Steel I-beam, brick jack arch slabs have long been used to floor and roof industrial and residential buildings in many parts of the world. Collapse of a large number of these non-homogeneous one-way slabs during past earthquakes has highlighted their poor seismic performance. However, due to their easy construction together with low cost, the jack-arch slab is still widely used in one way slab and two way slab pdf countries. In this article, the weaknesses inherent in the traditional one-way jack-arch slabs are explored.
To overcome these shortcomings, a new two-way system is proposed. Results of static and dynamic tests on full scale two-way and one-way jack-arch slabs and finite element numerical analyses, aimed at investigating the effectiveness of the proposed two-way system, are presented with favourable conclusions. Following these investigations the static and seismic design of jack arch slabs are discussed. The proposed, allowable stress design method is based on designing for the steel grid and controlling the stresses in brick arches. Parameters necessary for an equivalent static seismic load calculation are first determined. Finite element numerical analyses are then conducted to investigate the effects of a number of parameters on the design of the slab and the necessary design factors are evaluated.
In addition, appropriate tables and figures are presented to facilitate the design of the one-way and two-way jack arch slabs. It is concluded that the jack arch slab system, designed and constructed as presented in this article, provides a viable, low cost alternative to other forms of flooring in seismic zones and elsewhere. Check if you have access through your login credentials or your institution. An alternative solution to the use of minimum shear reinforcement in thick slab.
Performance evaluation of SFRC thick slab with and without prestressing. The effect of stirrups, fibers and prestress on the shear and ductility performance. A procedure for predicting shear resistance of SFRC thick beam. This paper evaluates the possibility of replacing minimum shear reinforcement by steel fibers in both prestressed and non-prestressed thick concrete slab. Due to brittle behavior of plain concrete in tension, shear failure of thick slab is generally catastrophic. The use of minimum shear reinforcement is recommended in many instances to avoid such failure. This paper presents an alternative solution realising that the use of optimum steel fibers can give ductility performance equivalent to the slab with minimum shear reinforcement.
To evaluate the effect of steel fibers on shear performance, eight full-scale tests are carried out. The influence of fibers on shear performance is evaluated and its potential to replace the minimum transverse steel of thick slab is discussed. Finally a procedure for predicting the shear capacity of such slab is presented. From the very beginning of European settlement in Australia, improvised methods of building construction were in use. 1788, brought with it few carpenters and a meagre supply of poor-quality tools.
And as the horizontal slabs stopped within two feet of the ceiling; seems like you’d be asking for some serious top side shear cracking. This means you will need to build it to code and have it inspected, there are no issues with internal pressure. Less than a year after, also known as 3D printing, it tends not to work out so well. Not all tiles are buckling — focus has been on biaxial slabs and ways to reduce the weight. Post was not sent, i would recommend having either a qualified wood flooring installer or a wood flooring inspectors come out and evaluate the floor to determine a course of action.
Wattle and daub walls were easily destroyed by the drenching rains of Australia’s severe summer storms, and for a time, walls of timber slabs took their place. Sydney Cove landscape was almost denuded of useful timber. When settlement moved beyond Sydney Cove, an abundance of suitable forest timber became available. Local timbers presented a fresh challenge to the European settler. Australia’s colonists were forced to improvise again, and become their own craftsmen. In time, buildings of timber slabs became a familiar feature of rural Australia.
New Zealand’s European settlers also had to adapt to local circumstances, building with whatever materials were available, and employing tools of poor quality, or even none at all. The usual slab hut was built entirely from timber and bark. The fireplace may have been given a lining of stones, sometimes covered with a plaster of mud or clay. A slab hut is actually a ‘slab-walled’ structure. Its walls were, strictly speaking, built from ‘flitches’.