جستجوی مقالات مرتبط با کلیدواژه « بارگذاری جانبی » در نشریات گروه « عمران »

The use of post tensioned flat slabs is common in structures that require the construction of long span. The main advantages of using this type of slabs are increasing the span to thickness ratio, deflection control and reducing the thickness of the floor. Post tension slabs are usually designed to withstand gravitational loads in the building. However, slab column connections in these systems must be able to withstand the deformations created by lateral loads and have sufficient ductility. In this research, an exterior unbonded post tensioned slab column connection is validated in ABAQUS finite element software. After ensuring the accuracy of the numerical model results, the effect of concrete compressive strength, the amount of effective prestressing levels and the tendon bonding influence in the seismic behavior of post tension slab joints are investigated. The results showed that the compressive strength of concrete and the prestressing level of concrete have a significant effect on the load-bearing capacity and ductility of the joints, while the bonding condition does not have much effect on the behavior of the joints.

In this paper, the behavior of laterally loaded monopiles was investigated considering soil and structure interaction, and using numerical modeling. The numerical model was, at rst, veri ed using large scale experimental test results and some analytical methods. Then, some sensitivity analyses were performed and the eects of parameters, such as free to embedded length ratio of the mono-pile, diameter of the pile, soil strength and etc., were investigated. Finally, the response of the laterally loaded mono-pile and soil system was compared with an end xed column to nd an equilibrium length for the column to have the best t response with the mono-pile and soil system. The veri cation analysis of numerical modeling showed good compatibility with the large scale tests results and analytical methods. Also, the sensitivity results showed that increasing the free to embedded length ratio and diameter of the mono-pile and reducing soil strength result in the rigid behavior of the mono-pile. Increasing the soil strength, pile diameter and embedded length of the mono-pile increases the mono-pile lateral bearing capacity. However, there is an embedded length, as critical depth, subsequent to which, the mono-pile lateral bearing capacity becomes constant. Comparing the load- displacement response of the mono-pile and soil system with an end xed column showed that it is possible to replace the mono-pile and soil with a column having an equiblibrium length as its initial length plus a pert embedded length (called depth of xity). The amount of depth of xity is suggested to be 6 to 10 times the pile diameter, without considering soil and pile conditions. The depth of xity depends on the free length and diameter of the monopile and soil strength, so that, increasing the free length of the mono-pile results in an increase in the depth of xity in dense sand soil. However, there is not a speci c trend in the loose sand soil.