摘要
本文以帽梁為實驗對象，以鋼筋間距符合規範與否，及使用光面鋼筋模擬完全無握裹力之情況下，分別探討混凝土在澆置7天及28天以後，施加部分載重以觀察裂紋之發展，以及比較握裹力極端的情況下，帽梁的結構行為。試驗結果顯示，竹節主筋符合鋼筋間距，在混凝土初齡期及施加部分載重，對裂縫的發展與大小影響較小，鋼筋與混凝土握裹力良好，試體裂縫產生多條且細，破壞為撓曲破壞，其撓曲彎矩強度符合規範計算值。光面鋼筋試體，在混凝土初齡期及施加部分載重，足以影響裂縫的發展與大小，握裹力不良試體裂縫少條且粗，鋼筋與混凝土握裹力喪失，將主筋力量轉至主筋彎勾上，以致彎勾將混凝土崩裂，鋼筋彎勾形成防護結構安全之最後一道防線。
並列摘要
This paper presents the behavior of cap-beam under the different bonding. Using the satisfying ACI code spacing of the deformed bars simulates good bond between concrete and bar. And using the round bars simulate unbond. The cap-beam subjected to pre-loading after 7 or 28 days of concrete placed. Final, we take ultimate load test to compare structure behavior of bond and unbond. According to the test results, since a good bonding stress is existed between the deformed-bar and concrete, the cracks are small as preloaded at the age of 7 day, failed in a ductile failure mode, and the ultimate flexure strength calculated by ACI code. The cap-beam with round bar will effect the cracks as preloaded after 7 days of concrete, the bond failed and the bar force were transferred to the hook under loading, it results in splitting of the concrete at the hook. Hence the hooks protect the cap-beam from failure of structure when bond failure.
延伸閱讀
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