Experimental Study on Strengthening Effect Analysis of a Deteriorated Bridge Using External Prestressing Method
Round 1
Reviewer 1 Report
The manuscript titled “An Experimental Study on the Strengthening Effect Analysis of a Deterioration Bridge Using External Prestressing Method” by Sang-Hyun et al. details the results of an experimental campaing on a long span prestressed concrete beam onto which external prestressing is installed. The topic is really interesting and actual since ageing of infrastructures is a real problem for bridges that have 40-50 years.
My comments are reported below:
1. A deep check of the English language by a native speaker is absolutely needed.
2. Please enrich the methodological section providing details about the test setups and testing procedures
3. Enrich the conclusions providing suggestions for the open problems (say the possibility of measuring the effectiveness of the external prestressing).
Other comments:
L. 55 The sentence is not clear. Please rewrite.
L. 59 Please, check how the references are included in the text. For example, change “Shenoy et al. (1991) conducted structural tests on PSC girders that had been used for 27 years [23].” into “Shenoy et al. [23] conducted structural tests on PSC girders that had been used for 27 years.” Similar considerations hold for lines 60-68.
L.118 The authors must provide references about the testing procedure. How can they obtain the force in the tendons from the measured force? Explanations are needed.
L. 126 What do the authors mean with “the effect of the loss occurred during bridge construction or demolition”? Was the PSC beam entire when they did the tests?
L. 138 No description about the external prestressing retrofit is provided. Please, detail (maybe with a drawing) how the external prestressing is added to the beam, where the tendons are connected, how the external force is transferred to the beam.
L. 173 What the “target individual tension” is?
L. 224 Would it be possible to estimate the crack load knowing the stress in the tendons?
Author Response
The reviewer's favorable response for publication of this manuscript is greatly appreciated.
I modified the written English after being examined by native speakers and experts.
Thank you for your kind review.
Author Response File: 
Author Response.doc
Reviewer 2 Report
The paper proposes an experimental study on the strengthening effect analysis of a deterioration bridge using external prestressing method. The English is acceptable, tables are well organized. The experimental tests developed in the manuscript are a good contribution to the field, but the Authors should explain some of their choices. Finally, I suggest a major revision. In what follows, I list some comments and suggestions that can be addressed by the authors while finalizing the manuscript in a major revision process.
Chapter 2.2: How were the mechanical properties of the materials evaluated?
Figure 4a: Figure 4a is taken from a book, it is recommended to redraw it. In addition, the words cannot be read.
Figure 5: Figure 5 is of poor quality.
Chapter 3:Chapter 3 is the crucial part of the manuscript. The data analysis part needs to be expanded to include literature formulations in order to be accepted as a journal article.
Line 187: Remove dot.
Author Response
The reviewer's favorable response for publication of this manuscript is greatly appreciated.
Thank you for your kind review.
Author Response File: Author Response.doc
Round 2
Reviewer 1 Report
Dear Authors,
the issues raised during the first stage of the review process has been addressed propertly.
Reviewer 2 Report
The manuscript can be published in the present form.
