Seismic Performance of Base‐Isolated Precast Concrete Shear Wall Structure with AHW Connections

Abstract

To improve the seismic performance and seismic reliability of precast concrete shear wall (PCSW) structure with improved assembly horizontal wall connections (AHW connections), base isolation technology was proposed to be applied in the PCSW structure. Two 1/4-scaled structure models using the improved AHW connections were constructed: a lead-rubber bearing (LRB) base-isolated PCSW structure model and a base-fixed PCSW structure model. Shaking table tests were conducted on these two models with three strong ground motions to assess the seismic performance of the structures. It was found that the improved AHW connections in the base-isolated PCSW structure are useful and effective and that they fulfil the requirements to be met by the connections to withstand an earthquake. In addition, the maximum absolute acceleration and base shear force of the base-isolated PCSW structure model were less than those of the base-fixed PCSW structure model, and the isolation effect on the absolute acceleration responses and base shear responses increased with increase in the intensity of ground motions. In a word, the seismic performance and seismic reliability of PCSW structures can be effectively improved using base isolation technology. After this investigation, the seismic responses of the base-isolated PCSW structure model were numerically simulated using OpenSees software. There was a reasonable agreement between the numerically simulated results and test results; thus, the numerical simulation method and analysis model used for the base-isolated PCSW structure model were verified.

Multicriteria Decision-Making Methods in Selecting Seismic Upgrading Strategy of High-Rise RC Wall Buildings

“…However, there are some main disadvantages in the TOPSIS model, including correlations between criteria, uncertainty in obtaining the weights only by objective methods or subjective methods, and the possibility of alternatives close to an ideal point and nadir point concurrently [17]. The avaiable literature mostly assessed the effect of each of the passive seismic control systems separately on the response of concrete structures with concrete shear walls [18][19][20][21][22][23], while performance based multi-criteria decision-making methods in selecting seismic upgrading strategy of high-rise buildings are scarce.The study reported in this paper investigated the effect of some widely used passive seismic control systems on improving the performance of concrete shear walls and their prioritization. To this end, a total of five passive seismic control systems was considered, namely, tuned mass damper (TMD), viscoelastic damper, friction damper, viscous damper and the lead-core rubber bearing.…”

Seismic Response Analysis and Damage Calculation of Long-Span Structures with a Novel Three-Dimensional Isolation System

“…In recent decades, many earthquake disasters have occurred both domestically and internationally, causing not only heavy casualties but also significant damage and destruction to many buildings [1]. Theoretical and experimental studies [2][3][4], as well as the occurrence of earthquake disasters [5][6][7], have shown that technology of basic isolation can efficaciously reduce seismic damage to building structures. At present, the vast majority of basic isolation technologies adopt a reasonable structural design, which can obtain the optimal full life cost of isolation structures, greatly promoting the promotion and application of basic isolation technology and the sustainable development of the construction industry.…”

Seismic Performance of Precast Short-Limb Shear Wall with the Bundled Connection at Different Axial Compression Ratios

“…Results showed that the proposed shear wall has excellent performance, although the area at the top of the preformed holes was a weak section. Feng [16] designed and constructed several full-scale specimens, including three short-limb specimens and three specimens with a higher width-to-thickness ratio, and tested the specimens under cycling loading. Results showed that the proposed precast shear wall had good seismic performance and that the additional vertical steel bar at the preformed holes could enhance the weak sections.…”