Abstract
Owing to the desirable bond strength and excellent workability, spiral hoop and bolted steel connectors are introduced to enhance the connecting performance of superimposed reinforced concrete shear wall (SRCSW) system. In order to investigate the seismic performance of SRCSWs, applying such connecting methods under flexure-shear interaction and flexural dominated status, two groups of precast (PC) specimens were constructed: one-story and two-story specimens. Seismic behavior in terms of crack patterns, load-displacement response, ductility, stiffness degradation, strain response, and deformation results of SRCSWs is evaluated by the quasistatic cyclic test. It is shown that the wall specimens with the proposed connectors exhibited similar failure mode to that of the cast-in-place (CIP) walls and possessed adequate seismic performance such as lateral resistance, ultimate drift ratio, and lateral stiffness besides the ease of erection. The strain responses and deformation results of the PC specimens under reversed cyclic loading were presented to evaluate the effectiveness of the introduced connections. The test results indicated that the PC walls adopting bolted steel connectors behaved better in force transmission and exhibited greater integrity characteristic compared with the specimens having spiral hoop connectors. Lastly, simplified finite element models considering the nonlinear slip behavior within the connection joint of SRCSWs were established and verified, which could provide sufficient accuracy and efficiency to predict the seismic response of the proposed wall system.
Highlights
Served as a semi-precast wall system, superimposed concrete shear wall is a combination of precast wall panel prefabricated at manufacturing plants and CIP concrete layer cast in construction site
Unexpected failures were reported by the previous seismic test on superimposed reinforced concrete shear wall (SRCSW) with conventional connection detailing. e in-plane rocking behavior attributed to the insufficient bond strength of traditional connections was observed when SRCSW was subjected to severe lateral force
For better observation of the crack progressing, grids by 100 mm × 100 mm were marked before the loading test, and the oblique lines representing the tracks of cracking are depicted in Figure 7. e test observations of the tested specimens can be summarized as follows
Summary
Served as a semi-precast wall system, superimposed concrete shear wall is a combination of precast wall panel prefabricated at manufacturing plants and CIP concrete layer cast in construction site. With the aim of reducing the slip at the wall-tofoundation joint and increasing the load bearing capacity, Wang et al [12, 13] proposed an innovative PC wall by adding inclined steel bracing into the cavity of SRCSW, achieving favorable seismic performance under cyclic loading test. Shen et al [22] carried out cyclic load tests of a new type of PC wall connected by steel shear key, and the test result indicated that the proposed wall specimen exhibits satisfactory bearing capacity and deformability. By arranging X-shaped steel bracing into the cavity of SRCSW, enhancement of the seismic performances in terms of lateral resistance, energy dissipation, ductility as well as stiffness is achieved. Seismic performance of one group of SRCSWs assembled with single wall panel element and another group assembled with two PC elements associated with interstory floor slab are evaluated and compared with that of CIP specimens. e workability and feasibility of the introduced connection joints are examined in this work
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