Effect of foundation compliance on earthquake stresses in multistory buildings*

Abstract

This paper shows the quantitative effect that foundation compliance has on the maximum base shear force and the fundamental period of vibration in typical tall buildings subjected to strong-motion earthquakes. A study was made of five-, ten-, and fifteen-story building models on the Electric Analog Computer, subjecting them to the ground accelerations of actual earthquakes. The base shear forces were measured, the foundation compliance of the models being changed through a very wide range. The properties specified for the building models are shown to be similar to the properties found in real buildings. The experimental results imply that the maximum base shear forces in typical buildings of five stories and higher during strong-motion earthquakes will be essentially unaffected by any degree of foundation compliance that can be expected in normal building practice. The fundamental period of typical buildings will be increased by about 10 per cent if the foundation compliance is the maximum that can be expected in standard building practice.

Spanning the scales of mechanical metamaterials using time domain simulations in transformed crystals, graphene flakes and structured soils

“…Last but not least, light, sound and heat interplay might form the essence of soon to come multiphysics small and large-scale metamaterials based on geometric transforms that have proved their utilities for understanding the structure of elements deriving from microscale and very large worlds [90]. The analogies used to translate knowledge gained in one area to another, much smaller or larger, should nonetheless be used wisely, as for instance scalability of phononic crystals breaks down at atomically thin scales [91], so in-depth analysis of elastic waves propagating in graphene such as illustrated in figure 12 requires more advanced models, and models of interactions between soil and structures during earthquakes are highly complex phenomena [92,93]. We would also like to mention that work on multiscale metamaterials inspired by biomimetism [94] is also emerging with notably fascinating results on spider webinspired labyrinth acoustic metamat erials [95], that could be further scaled up at the meta-city scale.…”

A Review on the Modelling Techniques of Liquid Storage Tanks Considering Fluid–Structure–Soil Interaction Effects with a Focus on the Mitigation of Seismic Effects through Base Isolation Techniques

“…The effect of support conditions on the response of a structure was first recognized by Martel [83], based on the observations of the failure of structures during many earthquakes in Japan [84]. Later, many researchers would go on to conduct numerical and experimental investigations on the SSI effect on the behaviour of building structures [11,[85][86][87][88][89][90][91][92]. Since tanks are also supported on the ground, it is logical to assume the presence of interaction effects between tanks and the supporting soil.…”

Investigating Three-Dimensional RCC Frames under Seismic Loading with Various Soil Conditions

“…Staad.Pro commercial edition is used extensively in structural analysis and design since it can handle several design codes for structures made of steel, concrete, and wood. Its adaptability encompasses a variety of dynamic analyses, such as response spectrum analysis, time records, a modal extraction [6][7][8][9][10]. Furthermore, under earthquake excitation, the study investigates the interdependent impacts of supporting soil flexibility and the phenomena of pounding, which occurs between adjacent buildings of identical height.…”