Seismic Vulnerability Assessment of Hybrid Steel-Timber Structure: Steel Moment-Resisting Frames with CLT Infill

In this article, seismic vulnerability assessment is carried-out on a novel hybrid structure (steel moment resisting frame (SMRF) and cross laminated timber (CLT) infill panels). For the seismicity of Vancouver, Canada, a three-bay, 3-, 6-, and 9-story height SMRFs are designed for two ductility levels (ductile and limited ductility). To study the seismic vulnerability CLT infilled building, parametric analysis was performed by varying infill configuration (bare frame, one-bay infilled, two-bay infilled, and fully infilled). The structure is modeled in OpenSees and nonlinear dynamic analysis is performed. Peak inter-story drift demand and corresponding FEMA performance limits (capacity) values are used to compute the corresponding fragility curves. From the analyses, it can be seen that as more bays are infilled, the fundamental period and seismic vulnerability is reduced significantly. The results highlight that, within the performance-based earthquake engineering, different objectives can be met with varying the CLT configuration.     

Seismic Behavior of FRP-Retrofitted Reinforced Concrete Frames

Although a significant number of studies have been conducted on the behavior of the reinforced concrete beam-column joints retrofitted with FRP materials, limited investigation considered the overall seismic behavior of the retrofitted frames. In this article, experimental and numerical studies are performed on a scaled-down eight-story and two full scaled low-rise ordinary moment resisting frames (OMRFs) retrofitted with FRP at the joints. Additional, rotational stiffness of the joints is implemented into pushover models to predict seismic performance and behavior factor of the retrofitted frames. Results indicate that FRP retrofitting is more effective than steel braces for low- and medium-rise OMRFs.     

Physics-based Simulation and High-fidelity Visualization of Fire Following Earthquake Considering Building Seismic Damage

This work proposes a framework for the physics-based simulation and high-fidelity visualization of fire following earthquake (FFE) considering building seismic damage. The seismic damage of regional buildings is simulated using multiple degree-of-freedom building models in conjunction with nonlinear time-history analysis. In parallel, a high-fidelity visualization is presented to simulate fire spread and smoke effects. A case study of downtown Taiyuan with 44,152 buildings is performed. The results show that the influence of different ground motions and building seismic resistances on fire ignition and fire spread can be taken into account and that the FFE scene can be displayed realistically.     

HEIDEGGER,LATOUR AND THE REIFICATION OF THINGS: THE INVERSION AND SPATIAL ENCLOSURE OF THE SUBSTANTIVE LANDSCAPE OF THINGS – THE LAKE DISTRICT CASE

“Thing” has undergone reification, and it has done so together with its linguistic “conjoined twin” – “landscape”. Whereas thing once was the name for meetings where people assembled to treat common things that matter, things, in the modern sense, have become physical objects (things as matter). Likewise, landscape's meaning has been reified from being a polity constituted by common thing meetings treating substantive things that matter, to becoming a spatial assemblage of physical things as matter. To fully grasp the contemporary meaning of both things and landscape it is necessary to understand the way in which those meanings are the intertwined outcome of a process of revolutionary inversion, or turning inside–out, by which the meaning of things has been spatialized, enclosed, individualized, privatized, scaled and reified as a constituent of the mental and social landscape of modernity. The potentiality of the concept of thing lies, it will be argued, in its continued containment of older, subaltern meanings that can work to empower an alternative “non‐modern” understanding of things along the lines of, but distinct from, Bruno Latour's notion of Dingpolitik, which will be termed “thing politics” here. This argument is analysed in relation to Martin Heidegger's concept of the “thing”, and exemplified by the mandate of the European Landscape Convention, and the modern planning usage of Landscape Character Assessment and Ecosystem Services, as applied to England's Lake District.     

明代隆昌寺无梁殿的动力特性及抗震性能研究

The brick - vault hall of Longchang Temple at Baohua Mountain is a representative of a series of Ming Dynasty brick - vault halls——a unique architectural heritage type in China. In order to evaluate the structural safety of this architectural heritage in earthquakes, we set up a three - dimensional finite element model to analyze its dynamic properties, seismic response spectrum and seismic time history in order to obtain the natural frequencies, modal modes, seismic effect, and seismic deformation and stress response. The results show that the structure of the hall features high symmetry and high torsional rigidity. The degrees of influence of earthquake on the vibration of the hall are as follows ： roof, side walls and arch on the second floor, eaves of the first floor, side walls and arch on the first floor. Under the Intensity 7 frequently - occurring earthquake, precautionary earthquake, and rarely - occurring earthquake, the most dangerous position of the hall is the junction of the arched window impost and sill wall on the side far away from the stairs on the first floor. In addition, prone to the tensile damage, each arch impost is a weak position in an earthquake. Finally, a seismic strengthening strategy for the brick - vault hall of Longchang Temple is presented based on the results of dynamic properties and seismic behavior analysis. © 2023, Sciences of Conservation and Archaeology. All Rights Reserved.     

Seismic Vulnerability of Historical Masonry Aggregate Buildings in Oriental Sicily

ABSTRACT

The seismic vulnerability assessment of historical UnReinforced Masonry (URM) buildings is a very complex task since it is strongly related to a great variety both of geometrical layouts and of masonry mechanical characteristics. In this article, some results of a Catania University research project, denomined “FIR 2014”, focused on the seismic vulnerability estimation of historical buildings, built in Catania after the 1963 earthquake, are presented. First, a detailed typological analysis of the considered urban fabric, characterized by typical residential masonry buildings, has been performed. Such analysis allowed recognizing an elementary structural modulus, which has been studied according to different geometrical layouts representative of isolated or aggregate buildings. The results of nonlinear static analyses, performed by applying an innovative macro-element approach, allowed for the assessment the seismic vulnerability of typical URM buildings coherently to the Italian seismic code. The adopted macro-element strategy for the seismic assessment of aggregate masonry buildings, although related to a specific historical center, may be applied to similar urban fabrics and can also be used for the calibration and validation of fast seismic assessment strategies, particularly useful for the evaluation of the seismic risk at urban scale.     

Intercontinental Hybrid Simulation for the Assessment of a Three-Span R/C Highway Overpass

This paper presents hybrid simulations of a three-span R/C bridge among EU, US, and Canada. The tests involved partners located on both sides of the Atlantic with each one assigned a numerical or a physical module of the substructured bridge. Despite the network latency in linking remote sites located on the two sides of the Atlantic the intercontinental hybrid simulation was accomplished and repeated successfully, highlighting the efficiency, and repetitiveness of the approach. Adaptations, challenges, and limitations are discussed, focusing on the implications of network communication latency, the insensitivity of the sub-structuring arrangement, and the accuracy of the results obtained.     

Distributed Tuned Mass Dampers for Multi-Mode Control of Benchmark Building under Seismic Excitations

The effectiveness of the multi-mode control of seismically excited building installed with distributed multiple tuned mass dampers (d-MTMDs) is investigated by comparing dynamic response with the other controllers, such as passive friction dampers, semi-active dampers, single tuned mass damper (STMD), and multiple tuned mass dampers (MTMDs-all.top), both installed at the top of the building, and arbitrarily distributed MTMDs (ad-MTMDs). It is concluded that the d-MTMDs exhibit improved performance as compared with the STMD, MTMDs-all.top, and ad-MTMDs. The d-MTMDs are also convenient to install owing to the reduced space requirements, being placed at various floors.