Earthquake loading lesson 1

Earthquake loading lesson 1 Earthquake loading is usually a reminisce of striking ground movements for all of us. Its been always a frightening matter for occupants as well as structural engineers. Unfortunately there are many common mistakes in both construction and design of multi-story buildings that eventually lead to collapse. As a result I have […]

Static, quasi-static and dynamic

Static, quasi-static and dynamic properties These technical terms are usually a bit confusing for beginners and occasional users. This article is aimed to explain the differences and assumptions of each term. A static problem is when acceleration is zero. Therefore, based on newton law the sum of all forces is equal to mass multiplied by […]

soil creep in embankment dams

In case of dam construction, massive soil embankment is subjected to the presence of water which can provoke the occurrence of soil consolidation. Consolidation is a 2-step process during which soil experiences a time dependent settlement. In scientific terms, the second step is called creep (also known as secondary consolidation) occurring long after the soil […]

Pore Pressure Dissipation Vs Depth

The rate of transfer of pore pressure to effective stress is a function of depth. In other words, in the boundaries which are near to drainage path pore pressure dissipates more quickly, while for the further areas it takes longer. In this figure different patterns of pore pressure dissipation are illustrated for a soil layer […]

Soil settlement part 1

Soil deformation When a soil mass is subjected to loading, such as loads due to embankment, soil settlement occurs. Regarding the time of soil deformation, settlements can be divided into 2 categories including elastic settlement and soil consolidation. Short term settlement occurs immediately after loading in all kinds of soils. Consolidation is a phenomenon that […]