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In recent earthquakes in developing countries, severe damage was observed on reinforced concrete buildings. This study focuses on exterior beam-column joints with substandard beam rebar anchorage and seismic strengthening by installing wing walls. First, a series of experiments was conducted to investigate the seismic behavior of exterior joints with substandard beam rebar anchorage representing typical Bangladeshi buildings. Two 0.7-scaled exterior joint specimens were tested, and these specimens showed beam rebar anchorage failure and/or joint shear failure. Prior to strengthening of the joint, a series of pullout tests was conducted on postinstalled bonded anchors in low-strength concrete for strengthening design. Then, an experiment was performed to apply the strengthening method by wing walls to one of the exterior joint specimens to improve the integrity, and this method was intended to prevent the failure of beam rebar anchorage. The strengthening method is proposed to extend the development length of beam longitudinal bars by considering the embedment length along the wing walls. The test results verified the effectiveness and applicability of the proposed strengthening method to upgrade exterior RC beam-column joints with deficient beam rebar anchorage. 相似文献
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Lusi,a clastic‐dominated geysering system in Indonesia recently explored by surface and subsurface observations 
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下载免费PDF全文 Karyono Karyono Anne Obermann Matteo Lupi Masturyono Masturyono Soffian Hadi Ildrem Syafri Abdurrokhim Abdurrokhim Adriano Mazzini 《地学学报》2017,29(1):13-19
The spectacular eruption of Lusi began in NE Java, Indonesia, on 29 May 2006 and is still ongoing. Since its birth, Lusi has presented a pulsating activity marked by frequent eruptions of gas, water, mud and clasts. The aim of this study was to bridge subsurface and surface observations to describe Lusi's behaviour. Based on visual observations from 2014 to 2015, Lusi's erupting activity is characterised by four recurrent phases: (1) regular bubbling activity; (2) clastic geysering; (3) clastic geysering with mud bursts and intense vapour discharge; (4) quiescent phase. With a temporary network of five seismic stations deployed around the crater, we could identify tremor events related to phases 2 and 3. One of the tremor types shows periodic overtones that we associate with mud wagging in the feeder conduit. On the basis of our observations, we would describe Lusi as a sedimentary‐hosted hydrothermal system with clastic‐dominated geysering activity. 相似文献
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