This paper proposes a simplified analytical model for seismic response prediction of concentrically braced frames. In the proposed approach, a multistory frame model is reduced to an equivalent shear-building one by performing a static pushover analysis. The conventional shear-building model has been improved by introducing supplementary springs to account for flexural displacements in addition...

Abstract: Absorbing boundary conditions are required to simulate seismic wave propagation in elastic media. In the first part of the paper, a number of relevant ABCs are reviewed with emphasis on practicality and ease of implementation. The second part of the paper describes the derivation of a new user element for seismic analysis in ABAQUS/Standard. The element is a combination of two ideas: ...

Plastic hinge models are widely used in earthquake engineering to predict the load-deformation relationships of reinforced concrete members. For the seismic assessment of bridges, it is appealing to use those relatively simple models if the response is predicted with sufficient accuracy. The applicability of these models to wall-type bridge piers with weak seismic detailing is examined. Flexura...

This study aims to develop seismic fragility curves for a typical pile-supported wharf. Fragility curve is one of the popular tools in seismic performance evaluation of a structure. The software FLAC2D was used to simulate the seismic performance of the wharf structure. Using eight time history records, occurred in past, as seismic loading, incremental dynamic analysis (IDA) was applied for sei...

The goals of seismic impact assessment can be achieved by seismic monitoring systems and seismic impact simulator. Seismic monitoring system, for the purpose of hazard analysis, local site effects analysis, vulnerability analysis, and estimation of loss, is one application of SHM in earthquake engineering. A prototype, conceptual seismic impact simulator integrating SHM, FEM, GIS, and Virtual R...

Seismic hazard and risk are fundamentally different concepts. Seismic hazard describes phenomena generated by earthquakes that have potential to cause harm, but seismic risk is the likelihood (chance) of experiencing a specified level of seismic hazard in a given time exposure. Seismic hazard occurs naturally and can be evaluated from instrumental, historical, and geological observations. Seism...

The vulnerability of the UHV porcelain arrester is very high under strong earthquake. To rise seismic reliability of the UHV porcelain arrester, a new type lead damper, which is a new patent product, is installed at the bottom of the equipment. To investigate the damping effect of the dampers, the experimental research and finite element analysis on seismic behavior of the UHV porcelain arreste...

Many exploration and drilling applications would benefit from a robust method of integrating vertical seismic profile (VSP) and seismic data to estimate interval velocity. In practice, both VSP and seismic data contain random and correlated errors, and integration methods which fail to account for both types of error encounter problems. We present a nonlinear, tomography-like least-squares algo...

At the turn of the last century, allies of industry on the Supreme Court deployed a novel constitutional doctrine to thwart government regulations aimed at improving public health and safety. During the Lochner v. New York era, the Supreme Court discovered a right to “freedom of contract” in the Due Process Clause of the Fourteenth Amendment that advanced the “economic liberty” of businesses to...