Details

Autor(en) / Beteiligte

• Liao, Yu
• Shi, Shaoqing
• Chen, Shou
• Ming, Xinwen
• Ge, Liangbin

Titel

Numerical evaluation of the retrofit effectiveness for polyurea-woven glass fiber mesh composite retrofitted RC slab subjected to blast loading

Ist Teil von

• Structures (Oxford), 2022-02, Vol.36, p.215-232

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Damage evolution laws of the PU-WGF retrofitted RC slab are built by FE analysis and data fitting.•PU-WGF coating has much better energy absorption capacity than that of the conventional PU coating.•PU-WGF coating was firmly controlled by thickness and WGF′s layers, not the WGF′s location.•PU coating has limited function in enhancing blast resistance of its reinforced RC slab. Polyurea (PU), which has a high elongation and energy absorption, is widely used as a retrofitting coating for building structure. However, the load-carrying capacity and flexural stiffness of the PU retrofitted structure cannot be fully enhanced under blast load as the low stiffness of the PU coating. To overcome this drawback, the woven glass fiber mesh (WGF) was selected as a 'soft rebar' to combine with PU to form a PU-WGF composite coating. Firstly, three reliable finite element (FE) models based on field explosion test setup were developed using LS-DYNA and verified according to the test data. Then, parametric analyses, comparison analysis and damage assessment were conducted by numerical simulation methods, where the developed models were verified by the field explosion tests. Results show that WGFs can increase the energy absorption of PU coating to 2.5 times, and downgrade the damage degree of its retrofitted RC slab, especially a collapse and severe damage occurs in it. On the contrary, the PU coating can hardly achieve this goal, which is mainly used to prevent the spalling of the explosion concrete fragments.