Experimental study of L‐shaped precast RC shear walls with middle cast‐in‐situ joint

Self Cite

Summary Prefabricated structure has prominent advantages such as easy control of construction quality, saving fabricating time and natural resources, and reducing environmental pollution and construction noise. The mostly used structural system in high‐rise buildings is reinforced concrete shear wall structure, which has high load capacity and lateral stiffness. Focusing on the connection of reinforcements, three T‐shaped partly prefabricated reinforced concrete shear walls and one cast‐in situ specimen in same dimensions as a control group are tested under low‐frequency cyclic loading to analyze their seismic performances in this paper. During the experiment, the axial compression ratio of specimens is fixed at 0.3, 0.4, and 0.5. Through the observation of phenomena and data analysis, hysteretic curve, skeleton curve, stiffness degradation, ductility, and load bearing capacity are compared and analyzed. The results show that partly prefabricated reinforced concrete shear wall has similar load bearing capacity with the cast in situ specimen, and it also has excellent ductility, stiffness, and energy‐dissipating capacity. The experimental results and analysis indicate that partly prefabricated reinforced concrete shear wall has outstanding seismic performances; under effective and reliable design, it can be used in building structures to play the same role as cast in situ components.

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on seismic performance of T‐shaped partly precast reinforced concrete shear wall with grouting sleeves

Fan

Lü

et al. 2019

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“…The vertical distributed reinforcements in the partly precast specimens are equivalently spliced by grouting sleeves arranged along the center line of the wall, which proved to be effective in literature, and the horizontal reinforcements are directly anchored in cast‐in‐situ boundary elements. This horizontal reinforcement anchorage is stronger than specimen fully precast with vertical joint whose precast parts behave separately under the load . Considering the intersection of the vertical and horizontal walls or the corners of the structure is much complicated, L‐shaped shear wall instead of long‐stripe shear wall is chosen as the research object.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on seismic performance of L‐shaped partly precast reinforced concrete shear wall with cast‐in‐situ boundary elements

Lü

Wang

et al. 2019

Self Cite

In order to promote industrial production of reinforced concrete shear wall, a typical partly precast reinforced concrete shear wall with both end boundary elements castin-situ and the other part precast is experimentally studied. In this paper, three Lshaped specimens of this kind and one completely cast-in-situ specimen as a control group are tested under low-frequency cyclic loading to investigate their safety, applicability, and different characteristics. For the partly precast specimen, the vertical distributed reinforcements of precast part are equivalently spliced by grouting sleeves arranged along the center line of the wall whereas the horizontal reinforcements are directly anchored into the cast-in-situ boundary elements. During the test, the axial compression ratio of these specimens is fixed at 0.2, 0.3, and 0.5, respectively.Such test phenomena and test data including failure modes, yielding load and displacement, the skeleton curve, energy dissipation, stiffness degradation, ductility, and so on are observed, analyzed, and compared. Chinese code and American Concrete Institute code are adopted to estimate the bearing capacity. Results show that the partly precast specimens have good integrity. With the increase of axial compression ratio, the bearing capacity of these partly precast specimens increases whereas the ductility decreases. It is also found that the partly precast specimens have slightly lower bearing capacity compared with the cast-in-situ specimen as well as excellent deformation capacity and ductility, which indicates the tested partly precast shear wall has good and reliable seismic performance and can be used as a structural element in building construction. KEYWORDS building industrialization, grouting sleeves splice, low-frequency cyclic load, precast reinforced concrete shear wall, seismic behavior

“…Shear walls, as important members of lateral resisting systems, are usually being split into several smaller ones and transported to site after curing, which leads to a certain amount of vertical and horizontal joints. Such structures have excellent seismic behavior with proper designs and have undergone several earthquakes without severe damages . However, due to improper construction of the joints, structural collapse may occur under seismic actions because of joint failures …”

Section: Introductionmentioning

confidence: 99%

Experimental study on seismic performance of L‐shaped insulated concrete sandwich shear wall with a horizontal seam

Wang

et al. 2018

Self Cite

Summary A series of new L‐shaped insulated concrete sandwich shear walls integrated with heat preservation function are tested for its seismic performance. Those specimens, partially excavated and filled with insulation materials, are made up of three precast specimens and one cast‐in‐situ specimen as a control group. For the three precast specimens, the vertical distributed reinforcements are equivalently spliced to the bottom beam by grouting sleeves arranged along the centerline of the wall, whereas for the compared specimen, they are directly cast‐in‐situ anchored. These specimens are tested under low frequency cyclic loading. The failure mode, yielding load and displacement, skeleton curve, energy dissipation, stiffness degradation, ductility, and so forth, are recorded and analyzed. The result shows that the precast specimens have similar bearing capacity and much better deformation capacity and ductility than that of the control group in this experiment. This indicates that the seismic performance of the proposed L‐shaped insulated concrete sandwich shear wall is desirable and generally meets the requirements of both function and safety, thus can be used as structural elements in practice. The methods in Chinese design code and American Concrete Institute code are adopted to calculate the ultimate shear capacity of this precast insulation shear wall, and it is found that the tested result is larger than the calculated one, indicating the calculation method is reliable.