This paper presents the results of an analytical seismic fragility analysis a typical steel highway bridge in New York State. The structural type and topological layout this multispan I-girder have been identified to be most continuous bridges details are designed as per State design guidelines. Uncertainties associated with estimation material strength, mass, friction coefficient expansion bearings, expansion-joint gap size considered. To account for uncertainties related properties...

This paper presents the seismic fragility analysis of a typical multispan simply supported steel bridge in New York State. A detailed description model including an parameter uncertainties was provided companion paper. The also describes sensitivity that performed to determine most critical parameters control response bridge. set statistically independent samples and earthquake were specified for analysis. Two alternative retrofit designs presented results this based on data assembled show...

This paper studies the effects of long duration ground motion on three conventional low-rise light-frame wood houses with different sheathing configurations. These are two-story residential built an oriented strand board (OSB) wall system and stucco sheathing, OSB without stucco, a horizontal stucco. Three-dimensional numerical models structures were developed using Timber3D program calibrated full-scale shake table test data. The shear systems simulated modified Stewart (MSTEW) model that...

In structural health monitoring (SHM), measuring and evaluating dynamic responses are critical for safety management of civil infrastructures. Particularly, online forecasting the under extreme external loading conditions (e.g., earthquakes) takes a significant role in SHM to provide early warning ensure safe operation. practice, complex causality intrinsic interactions between seismic excitation response make it challenging establish reliable predictive scheme. The present paper proposes...

This paper studies the dynamic seismic behavior of a typical highway bridge in New York State. The topological layout and structural details this multispan simply supported steel-girder are identified as most State Department Transportation inventory database. Three-dimensional finite-element models established considering nonlinear critical components. An in-depth parametric study is carried out to evaluate sensitivity bridge's response variations its parameters. analysis determined that...

Neural solvers based on the divide-and-conquer approach for Vehicle Routing Problems (VRPs) in general, and capacitated VRP (CVRP) particular, integrates global partition of an instance with local constructions each subproblem to enhance generalization. However, during phase, misclusterings within subgraphs have a tendency progressively compound throughout multi-step decoding process learning-based policy. This suboptimal behavior turn, may lead dramatic deterioration performance overall...

Various retrofit measures, such as elastomeric bearings, lead-rubber viscous dampers, and jacketing with carbon fibers, are commonly used to improve the seismic performance of multispan continuous steel highway bridges. In this paper, we have investigated effectiveness these measures through comparisons fragility as-built retrofitted Both bearings reduce bridge piers significantly isolation effects. Wrapping fiber-reinforced polymer (FRP) increases effective ductility confinement shifts...

The Shanghai Tower is a newly built 127-story and 632 m high super tall building. As of April 2017, it was ranked as the second tallest building in world. Its main structural system mega-frame-tube-outrigger with six outrigger trusses along height. Due to its unique configuration, series field laboratory model tests have been conducted better understand dynamic characteristics. Before construction, scaled tower tested on shake table, results were used refine design tower. At completion...

Cross-laminated timber (CLT) has been gaining popularity also in seismic regions, because of its low carbon footprint and potential cost-competitiveness with concrete steel construction. Recent effort focused on developing standardized design provisions for CLT buildings. In the study presented herein, incremental dynamic analysis (IDA) was performed a six-story platform-type building. A nonlinear numerical model developed OpenSees considering shear walls as elastic shell elements...

Recently, increasing terrorist threats on bridges have illustrated the vulnerabilities of this type transportation infrastructure. Because cost and safety constraints, it is impractical to obtain complete structural response by testing a real bridge, so in recent years, fully coupled fluid-structure interaction model, which still has several assumptions, was developed simulate blast wave propagation process its with structure; become an advanced method better analyze loading effects....

Most previous research on seismic performance of cross-laminated timber (CLT) structures focused platform-type construction. This paper investigates the and collapse risk a balloon-framed CLT school building, designed for Vancouver, Canada. Incremental dynamic analysis was performed using three-dimensional numerical model. Experimental data from connection- wall-level tests were used to calibrate validate Twenty-one ground motions (crustal, subduction inslab, interface) selected. The results...

Moderately ductile steel moment frames (SMF) are a common lateral load resisting system (LLRS). They allow for flexible architectural design low- and mid-rise buildings but become uneconomical high-rises due to the large member sections satisfy drift requirement. In contrast, lightweight cross laminated timber (CLT) shear walls provide adequate stiffness loads controlling in high-rise construction. A hybrid structural combining SMF with balloon-type CLT shearwalls offers an innovative...

This paper presents experimental investigations on the lateral performance of cross-laminated timber (CLT) shear walls with customized self-tapping screw (STS) connections. The panel-to-base (hold-downs and brackets) panel-to-panel (spline) connections were tested under quasi-static monotonic reversed cyclic loading to derive design values STS, which shown be 2.8–3.6 times higher than those calculated using current Canadian standard. Then, a total 26 CLT walls, including single-, double-...