Vertical Axial Load Research Articles

Estimation of ultimate loads of eccentric-inclined loaded strip footings rested on sandy soils

Apart from the vertical axial loads, the footings of portal-framed buildings are often subjected to eccentric and eccentric-inclined loads caused by forces of earth pressures, earthquakes, water, w...

NUMERICAL ANALYSIS OF BEARING CAPACITY AND STRESS BEHAVIOUR OF ECCENTRICALLY LOADED FOOTINGS

Footings are structural elements transmit the static, dynamic, horizontal and vertical structure loads to the underlying soils safely and economically. Apart from the vertical axial loads, the footings of portal framed buildings are often subjected to eccentric loads caused by forces of earth pressures, earthquakes, water, wind, etc. For designing footings subjected to earthquake forces, adopting appropriate values of horizontal and vertical seismic coefficients, equivalent seismic forces can be conveniently evaluated. These forces in combination with static forces make the foundations subjected to eccentric-inclined loads. The problems of footings subjected to eccentric inclined loads are frequently encountered in the cases of the foundations of retaining wall, abutments, columns, stanchions, portal framed buildings etc. Sometimes the corner of the column of these portal-framed buildings is located very close to the property line, and hence subjected to eccentric loading. Finite element based two dimensional computer software Plaxis 2D has been used in this study. Accuracy and consistency of the model used in the analysis has been investigated with modeling of the stress-strain behaviour of the soils existing in the literature. The effects of the footing geometry (square, circular), the soil type (clay, sand) and the loading conditions (centric, eccentric) on the bearing capacity, settlement and vertical stress characteristics of the shallow footings have been investigated.

枠組煉瓦組積造壁体の耐震性能向上に関する実験的研究 : 断面形状・鉛直軸力および水平補強筋が壁体の耐震挙動に及ぼす影響

In order to investigate the effective seismic strengthening methods for un-reinforced brick masonry (URM) walls in developing countries, a total of twenty confined and unconfined two-dimensional (2D) and three-dimensional (3D) brick masonry wall specimens with different wall reinforcing details are designed, constructed and tested under constant vertical axial loads of 0.48MPa and 0.84MPa, and alternately repeated lateral forces. One of the main conclusions obtained is that the confined brick masonry walls with connecting bars along the vertical wall-to-wall connections between URM walls and cast-in-place confined reinforced columns as well as the horizontal wall reinforcement are very effective for improving the seismic structural behavior of URM walls against severe earthquakes.

型枠コンクリートブロック造耐力壁の耐震性能に関する実験的研究 : 水平加力点高さ,鉛直軸力およびブロックユニットの影響

In order to investigate the effects of height of lateral forces, vertical axial loads and presence of masonry units on seismic behavior of reinforced fully grouted concrete masonry (grouted masonry) walls, twenty different wall specimens were tested under constant compression, tension and variational axial loads, and alternately repeated lateral forces. Test results indicate that the seismic behavior of grouted masonry walls is remarkably affected by the height of lateral forces as well as the values of vertical axial loads, and the grouted masonry walls have almost the same seismic resistant capacity as reinforced concrete walls.