An aqueduct is a bridge-like structure that supports canal passing over river or low ground, and it an important part of water conveyance system. Aqueduct piers are extremely vulnerable to damage during strong earthquakes can result in structural collapse. Further, excessive seismic displacement will also fracture aqueduct’s rubber water-stop interrupt the normal service after earthquake. There...

The seismic activity in some parts of the world requires that the performance of structures under this type of excitation, is carefully evaluated. In regions where seismicity is insignificant, the conventional design approach aims at the design of structural members in such a way that all static and dynamic loads (such as wind load) are withstood elastically. However, in cases where seismic exc...

This paper examines four methods by which ground motions can be selected for dynamic seismic response analyses of engineered systems when the underlying seismic hazard is quantified via ground motion simulation rather than empirical ground motion prediction equations. Even with simulation-based seismic hazard, a ground motion selection process is still required in order to extract a small numbe...

Minor faults, subsidence columns, coal tunnels and gob are very important in coal mining because they can cause flooding accidents, broken coal beds, added fissures, and gas accumulation. All of these factors will increase coal mining risk. In addition, minor faults also affect the design of roadways. In this article, we have achieved satisfactory results in identifying minor faults, subsidence...

Unreinforced masonry (URM) structures are known to be rather vulnerable to seismic loading. Modern URM buildings with reinforced concrete (RC) slabs might, however, have an acceptable seismic performance for regions of low to moderate seismicity. In particular in countries of moderate seismicity it is often difficult to demonstrate the seismic safety of modern URM buildings by means of force-ba...

A seismic isolated structure is usually a long-period structural system, which may encounter a lowfrequency resonance problem when subjected to a near-fault earthquake that usually has a long-period pulse-like waveform. This long-period wave component may result in an enlargement of the base displacement and a decrease of the isolation efficiency. To overcome this problem, a rolling-based seism...

A ‘‘smart’’ base isolation strategy is proposed and shown to effectively protect structures against extreme earthquakes without sacrificing performance during the more frequent, moderate seismic events. The proposed smart base isolation system is composed of conventional low-damping elastomeric bearings and ‘‘smart’’ controllable ~semiactive! dampers, such as magnetorheological fluid dampers. T...

Well-seismic ties allow rock properties measured at well locations to be compared to seismic data, and therefore are useful for seismic interpretation. Numerous methods have been proposed to compute well-seismic ties by correlating real seismograms with synthetic seismograms computed from velocity and density logs. However, most methods tie multiple wells to seismic data one-by-one, and therefo...

SITUATION Almost indisputable belief that base isolation hardware should separate a building from shaking ground just by definition is extremely appealing. The examples are numerous. Sometimes, it was even stated that seismic forces in base isolated structures could be reduced by factor of 66 in comparison with conventional construction (Tajirian et al. 1990), though the degree of promised miti...