- 學位論文
施工震動對低強度混凝土結構物鋼筋握裹強度之影響試驗及研究
The Test and Study of the Steel Bond Strength for the Low Strengh Concrete Structures Subject to Constructive Vibration
摘要
最近幾年房地產景氣逐漸好轉，房價、地價不斷攀升，在路上常見工地施工或是附近老舊房子室內整修的工程，不論是哪一種，皆會使用人力機械（如電動鎚）之來進行震動施工，這些老舊的結構物可能因為當年的施工較差與規範較寬鬆、或是年代已久，使得強度較低，若進行整修或是附近工程施工時，是否較一般強度結構物容易受到影響，造成握裹應力折損值得探討，本文以試驗研究鋼筋混凝土結構，鋼筋受施工機具震動後，鋼筋與混凝土間握裹力所受之折減，進行握裹應力折損評估研究。 本試驗依據中國國家標準CNS 11152規定設計試體模擬鋼筋混凝土建築物其內部以電動鎚拆除非結構體時震動到鋼筋與混凝土，試驗分析研究鋼筋混凝土握裹應力強度。試體藉由相同震動頻率、以各種不同之混凝土強度及不同鋼筋號數及不同之震動時間等變數，試驗其握裹應力之影響並建立其間之關係曲線圖，以瞭解鋼筋混凝土受到震動後其握裹力的折損情況；經由試驗結果顯示，混凝土規劃強度245kgf/cm2以下者鋼筋受震動時均有折損現象，混凝土規劃強度140kgf/cm2以下者，震動試驗握裹應力折損現象較為明顯。
並列摘要
Due to the upturn of prosperity, the price of real estate lead a growth trade recently. Works for building or refurbish houses can be seen everywhere. Man-operated machine, such as electric drill, are broadly used for dealing with construction-induced vibration. However, elder buildings may lead lower supporting strength because of the worse construction, generous regulation or it’s age. In this situation, it is worth to exploit whether theses elder building are easier to be effect and have an impact of the compromise on bond stress when there is a ongoing work around it or its refurbishment. This dissertation examines the extent of compromise on bond stress by testing the structure of reinforcement concrete, as well as the impact to bond between reinforcement and concrete after taking into account the construction vibration on concrete and reinforcement respectively In accordance with the Chinese National Standard CNS 11152 regulation, the test is designed to analyze bond stress density on reinforcement concrete by simulating construction vibration (from knocking down non-structural parts) on reinforcement and concrete in reinforcement concrete building. Given the same vibrating frequency and similar reinforcement size, testing object tested the impact of bond stress under various concrete densities, vibrating positions and vibrating durations, and mapping its correlations into a curve chart, to fine whether bonding of reinforcement concrete is compromised after the effect of vibration factored in. According to the result of the test, concrete of planned density under 245kgf/cm2 usually suffered damage on vibration, whereas concrete of planned density under 140kgf/cm2 suffered obvious damage in bond stress.