###### 1 Introduction  
Thin-walled storage tanks have been widely used in many fields as fluid tanks for chemical, electrical power, and food engineering, among others. TSTs are also often used as key facilities in whole production systems. The destruction of TSTs will cause an interruption in the production process, and can even lead to disasters. However, a large number of TSTs have appeared with increasing signs of deterioration, reducing the load-carrying capacity, because of corrosion or aging degradations. Moreover, large earthquakes, which have occurred frequently in recent years, especially in the Pacific Ocean, can cause damage to not only degraded tanks, but also to existing healthy tanks [1, 2]. Therefore, strengthening these structures to improve the performance against the buckling caused by dynamic events is necessary to ensure the sustainable development of economy and health infrastructures. Several failure modes were observed in TSTs due to past earthquakes [3], such as anchorage failure, tank support failure, roof failure, foundation failure, connecting piping damage, and shell buckling. In all of these types of damage, because of the thinness of the TSTs, shell walls are susceptible to the elasto-plastic buckling and elastic buckling under various types of loads, especially dynamic loading. The buckling behaviors of TST shell walls have been investigated by several researchers [4, 5, 6, 7, 8, 9, 10, 11]. The buckling failure modes can include shear buckling and bending buckling [5]. Some cases of bending buckling can be elephant foot buckling (EFB) or diamond buckling. The EFB, which is defined as the outward bulge around the base of the tanks, is related to the elasto-plastic buckling of TSTs. Furthermore, the elastic bucking of TSTs includes the shear buckling of shells or diamond buckling at the bottom of the TSTs [10; 11]. Our main interest in this study was to strengthen the effects of shell walls in TSTs against dynamic loading in the elastic areas. The typical and traditional solution to strengthening aging TSTs is to weld with bulky and heavy steel plates, which are difficult to repair and are prone to corrosion. In addition, the reparation process can interrupt the business and can cause damage to storage materials during the structural renovations. Recently, the use of carbon fiber reinforced polymers (CFRPs) to strengthen concrete beams and columns has been popular because CFRPs have many advanced characteristics, such as having high strength and corrosion resistance, and being lightweight [12; 13; 14; 15]. Moreover, the use of CFRPs to improve the load-carrying capacity and performances of steel structures has also attracted many researchers [16; 17; 18; 19; 20; 21; 22]. As a result, CFRP strengthening is an effective way to not only improve the performances of structures, but also to maintain the working conditions of TSTs. While the strengthening effects of CFRP in steel structures were proved by many researchers, a limited amount of research has been reported on the strengthening effects of CFRP for TSTs, especially TSTs subjected to dynamic loads. Regarding studies about the strengthening effects of CFRP layers for thin-walled steel plates, [PERSON] et al. [23; 24] conducted a serious of experiments and numerical methods to investigate the shear capacity and fatigue resistance of thin-walled plate girder web panels strengthened by novel preformed-corrugated FRP panels under static and cyclic loading. They found that the ultimate load capacity was increased by 29% for CFRP strengthening and 20% for CFRP strengthening with three layers of CFRP and GFRP. [PERSON] et al. [25] carried out a series of laboratory tests to evaluate the effect of the number of CFRP layers and the fiber orientations on a thin steel plate shear wall under a cyclic shear load. The results showed that applying CFRP laminates can significantly increase the yield strength, ultimate strength, and secant stiffness.