Nonlinear Instability Behavior and Buckling of Shallow Arches Under Gradient Thermo-Mechanical Loads

Abstract

This paper investigates the nonlinear behavior and buckling of shallow arches under gradient thermal and mechanical loading. The gradient temperature varies continuously along the thickness of the cross section of the arch but uniformly distributes over the entire length of the arch. The principle of virtual work and mid-plane plane formulations are employed to derive analytical solutions for the structural responses, internal force and critical buckling loads of the arch. Subsequently, the phenomenon of the buckling mode switching are also identified and discussed. It is found that the fixed arch under gradient thermo-mechanical loading can buckle in a symmetric instability mode or an anti-symmetric instability mode, namely limit point buckling or bifurcation buckling, which depend on its geometric parameter and the gradient temperature. The effects of the gradient temperature change on the radial displacement, axial displacement, axial compressive force and bending moment as well as critical buckling loads of the arch are investigated through parametric studies comprehensively.

Introduction

Arches have been used extensively in civil and ocean engineering load-bearing structures. The stability of arch structures has attracted considerable attention from both research and engineering communities, and numerous studies on the nonlinear instability behavior of arches can be found in the open literature (Pi and Bradford, 2004a; Pi and Bradford, 2004b; Pi et al., 2011; Liu et al., 2018a; Liu et al., 2018b; He et al., 2020; Liu et al., 2020). In practical engineering, a steel arch may be subjected to thermo-mechanical load that leads to instability of the arch. It is well known that the material property of the steel is dependent on the temperature (Standard Australia, 1998; Heidarpour et al., 2010a; Maruschak et al., 2012; Moghaddasie and Stanciulescu, 2013; Yasniy et al., 2013; Heidarpour et al., 2014; Wang et al., 2020). When the applied temperature is uniformly distributed over the whole arch, the variations of the material property of steels caused by the temperature is uniform, and the steel arch is still isotropic structure. So the classical analysis method can be used to determine the structural behavior of the arch. A considerable amount of literature has been published on the linear or nonlinear behavior of arches subjected to uniform thermal load. Bradford et al. (Bradford, 2006a; Bradford, 2006b; Bradford, 2010) studied nonlinear instability behavior of a pinned arch under uniform thermal loading only. They found that the axial force in the arch produced by temperature is uniform along the arch axis. Pi et al. (Pi and Bradford, 2010a; Pi and Bradford, 2010b; Pi and Bradford, 2014) conducted a series of studies regarding the nonlinear in-plane thermo-elastic behavior of the crown-pinned, pin-ended and fixed steel arch. Heidarpour et al. (2010b) proposed a generic model to investigate the nonlinear elastic behavior of steel-concrete arches subjected to sustained loading at elevated temperatures. Lu et al. (2019) derived the exact solutions for the out-of-plane buckling load of the steel arch in a thermal environment incorporating shear deformations. The dynamic buckling of an arch subjected to transient thermal loading is studied by Keibolahi et al. (2018), from which they verified that the dynamic snap through buckling of the arch may occur when under rapid surface heating. Virgin et al. (2014) considered the influence of temperature and proved that temperature had a great influence on the extreme point of instability of arch. Malekzadeh et al. (2009) investigated the in-plane free vibrations of FGM arches under thermal environment by adopting two-dimensional elasticity theory and first-order shear deformation theory (FSDT). Yang and Huang (Yang et al., 2019a; Yang et al., 2019b; Yang et al., 2020a; Yang et al., 2020b; Yang et al., 2020c). presented an analytical solution of nonlinear in-plane buckling for a novel graphene reinforced composite arch/beam under mechanical/thermal loading, and determined the special parameter switching the buckling mode of the arch.

However, when the applied temperature is gradient distributed along one or two direction of the arch, the variations of the material property of steels caused by the temperature is non-uniform, and so the arch becomes anisotropic structure. The existence of anisotropy and involvement of geometric nonlinearity makes the problem of structural stability of the steel arch more complicated. So far, there has been very limit research investigating the nonlinear instability behavior of arches under gradient thermo-mechanical loadings. Cai et al. (2012) studied the elastic buckling of parabolic arches with rotational constraint under a vertical uniform load and uniform/gradient temperature changes. Pi et al. (Pi and Bradford, 2010c) developed a research on the nonlinear thermo-elastic buckling of pinned arches under temperature gradient field, and they also studied the out-of-plane buckling of fixed and rotationally restrained slender beam under linear gradient thermal action (Pi and Bradford, 2008; Pi and Bradford, 2010a; Pi and Bradford, 2015). Bateni and Eslami. (2014) discussed the effects of temperature gradient on the buckling of FGM arches and concluded that the temperature gradient enhances the buckling resistance of arches under a lateral mechanical load. Similar researches were also observed from Babaei’s report for the Thermo-mechanical nonlinear in-plane analysis of fix-ended FMG shallow arches (Babaei et al., 2018a; Babaei et al., 2018b). Song et al. (2019) carried out a linear analysis on the instability of steel arch under linear temperature gradient field and uniformly distributed radial load according to the effective centroid method and the principle of virtual work. To the best of authors knowledge, no work has been done on the nonlinear behavior and buckling of steel arches under gradient thermal and uniform radial loading.

Therefore, an analytical study is carried out in this paper to investigate the structural responses and specifically the buckling behavior of arches under gradient thermo-mechanical loadings. The principle of virtual work and mid-plane plane formulations are employed to derive the nonlinear equilibrium paths and critical buckling loads. The temperature-dependent geometric parameters determining the buckling modes of the arch are also obtained. The effects of gradient on the structural response, such as radial and axial displacement, internal force and critical buckling loads are discussed.

Nonlinear Equilibrium

As shown in Figure 1, a fixed arch with center angle , arc length S and radius R is subjected to gradient thermal load and uniform radial load, where v and w are the radial and axial displacements in the mid-plane of the arch, respectively. By introducing the linear gradient temperature field, a temperature field T(z) varies continuously along the thickness of the cross section of the arch but uniform over the entire length of the arch.

FIGURE 1

Before the structural analysis, the following assumptions are adopted as: 1) deformations of the arch satisfy the Euler-Bernoulli hypothesis; 2) expansions of the cross section are ignored; 3) the states of temperature is treated as time-independent; 4) the coefficient of thermal expansion is independent of the temperature.

According to classic shallow arch theory, the nonlinear strain-displacement relation of the arch is given aswhere , = v/R and = w/R.

Therefore, the nonlinear stress of the arch under gradient temperature T(z) iswhere the reference temperature is 20°C, the linear gradient temperature T(z) is formulated aswhere T₁ and T₂ are the temperature at the top and bottom of cross section. E(z) is the temperature-dependent elasticity modulus of steel according to the Australian Code AS4100 (Heidarpour et al., 2010a) which is given aswhere E₂₀ is the elastic modulus of steel at 20°C.

According to the principle of virtual work and mid-plane plane formulations, the nonlinear equilibrium equation of the arch is stated asin which, axial compressive force N and bending moment M are formulated aswhere A₁₁, B₁₁ and D₁₁ are the stiffness components defined as

By substituting Eq. 6 into Eq. 7 leads to a new expression of Eq. 7 as

Integrating Eq. 5 by parts obtains the equilibrium equation asand also obtains the boundary conditions of the fixed arch as when .

By substituting Eqs 9, 10 into Eq. 11, the equilibrium equation of arches is rewritten aswhere μ is defined as

By solving Eq. 12 and considering the fixed-end boundary conditions, obtains

By substituting Eq. 14 into Eq. 10, the axial displacement is solved as

Substituting Eqs 14, 15 into Eqss 6, 7, the exact expression of the axial compressive force N and bending moment M of the arch are determined as

Eqs 10, 16 shows that the axial compressive force of the arch is constant through the arch when the gradient temperature is given.

By substituting Eq. 14 into Eq. 6 and integrating it over the entire length of the arch, the nonlinear equilibrium equation is obtained aswherewhere , is a geometrical parameter defined as

By combining Eqs 14, 18, the solutions of the nonlinear equilibrium conditions of the fixed arch under gradient thermo-mechanical loadings.

Buckling Analysis

Typical symmetric limit point buckling may occur when the arch is subjected to a gradient thermal and uniform radial load. When this happens, the arch reaches a limit point load and buckle in a limit point instability mode. The limit point loads are located at the local extrema of the nonlinear equilibrium path defined in Eq. 18, and the equation of equilibrium between limit point loads and axial force parameter can be determined by using partial derivative method aswhere

Solving Eqs 18, 23 simultaneously, the critical axial force parameter and the limit point buckling load Q can be obtained, respectively.

Beyond symmetric limit point buckling, the anti-symmetric bifurcation buckling may also occur to the arch under gradient thermal and uniform radial load. The differential equation for bifurcation equilibrium of the arch is determined by the author previous research as (Heidarpour et al., 2010b)where is the bifurcation buckling displacement. Then, a characteristic equation can be determined by solving Eq. 25 incorporating the fixed-ended boundary conditions of the arch as

When in Eq. 26, leads to a critical axial force parameter for bifurcation buckling as

Substituting into Eq. 13 leads to the axial compressive force N_b of the arch asand substituting into Eq. 18 leads to the nonlinear equilibrium equation for bifurcation buckling aswhich is a mono basic quadratic equation, and the existence of real solutions for Eq. 29 requires thatfrom which a critical parameter defined as the minimum geometric parameter triggering bifurcation buckling of the arch is solved as

When in Eq. 26, leads to a critical axial force parameter for lowest buckling of the arch as

Substituting into Eq. 18 and solving the lowest buckling load as

When the axial force parameter approaches to critical axial force parameter and leads to a real solutions for the lowest buckling load given by Eq. 33, the condition need to be satisfied as

Similarly, a critical parameter triggering lowest buckling of the arch can be solved from Eq. 34 as

When the arch having under a given gradient temperature, there is no buckling for the arch instead of nonlinear bending.

Parametric Study

Comparisons

The finite element (FE) results are presented in this section to validate the proposed method. For conveniently and accurately, the FE analyses are performed by ANSYS 14.0 (Pi and Bradford, 2015) with using SHELL181 elements. In the ANSYS modeling, the dimension of cross section is b× h = 0.03 m × 0.025 m, and the cross section is subdivided into multiple layers in the thickness direction for simulating the material variation where the material properties of each layers are determined by Eq. 4. According to the convergence study, the difference between the results with 10 layers and 1,000 layers is less than 0.3%, which means that 10 layers adopted in the finite element model is sufficiently accurate to model a beam with continuous gradient varying material properties. Thus, 10 layers are adopted in the following FE analyses.

The result verification of the radial displacement at arch crown (v_c/f, ) and the axial displacement at quarter point (w_q/f, ) are shown in Figure 2A, where the applied radial load is qR = 0.25N_b20. Note that N_b20 is the value of N_b at 20°C given by Eq. 28, and f is the rise of the arch. Moreover, the verification of the load-displacement curve of the arch is presented in Figure 2B. From the comparisons, the proposed analytical result agrees well with the FE results.

FIGURE 2

Nonlinear Structural Responses and Buckling Loads

Figure 3 displays the variations of the structural responses (Figures 3A,B) and internal actions (Figures 3C,D) due to the gradient temperature change without applied external load (qR = 0) along the arch axis, and the gradient temperature change shows a significant effect on the nonlinear structural behavior of the arch. It is observed from Figure 3A that the value of the radial displacement is negative, which means that the deformation of the arch under the gradient temperature change is in the upward direction. It is also observed that the radial displacements are symmetric about the crown of the arch (Figure 3A), while the axial displacements are anti-symmetric about the crown of the arch (Figure 3B). Moreover, the temperature-induced axial force N and bending moment M are presented in Figures 3C,D. It shows that the structural internal forces increase as the gradient temperature change increase, and the effects of the gradient temperature change on the structural internal actions of arches are indeed significant.

FIGURE 3

The combining effects of the gradient temperature change and uniform radial load on the dimensionless radial displacement and bending moment are shown in Figures 4A,B, respectively with qR = 0.25N_b20. From the observation, the directions of the force-induced radial displacement and bending moment are opposite to that of temperature-induced, and the increasing temperature-induced structural responses are counteracting the responses produced by the applied uniform radial load as the gradient temperature change increasing.

FIGURE 4

Figure 5 illustrates the influence of gradient temperature on the limit point buckling load (P_L) and bifurcation buckling load (P_B) of the arch. As can be seen from Figure 5 that the effects are related significantly to the geometrical parameter of the arch. For the arch with , the buckling loads of the arch first increases slightly until and then decreases. However, the buckling loads of the arch with decreases monotonically with an increase of gradient temperature. This is consistent with the observation in Table 1, where buckling loads of arches with different geometric parameter under different gradient temperature change are tabulated.

FIGURE 5

Nonlinear Equilibrium Paths and Buckling Mode Switching

In addition to the investigation on the nonlinear structural responses and buckling loads, the nonlinear equilibrium paths and the buckling mode of the arch under gradient thermal and uniform radial load are explored in this section. Figure 6 depicts the nonlinear equilibrium paths of the arch with under gradient temperature in Figures 6A,B, and in Figures 6C,D, respectively.

FIGURE 6

Noted from Figures 6A,B, when the gradient temperature change is equal to zero, the limit point buckling occur to the arch because the bifurcation point is located behind the limit point. However, as shown in Figures 6C,D, when the temperature applied to the arch is higher than a certain value (i.e. ), the bifurcation point of the arch is located before the limit point, so the bifurcation buckling of the arch occurs. Therefore, a specific gradient temperature change switching the buckling mode of the arch is found, and its value can be determined by setting the limit point load obtained from Eq. 23 to be equal to the bifurcation buckling load obtained from Eq. 29 at , from which a critical parameter that is switching the buckling mode can also be solved when a gradient temperature is given.

As previously discussed, there are critical parameters , , and that switch the buckling mode of the arch. For an arch with , the arch buckles in a bifurcation buckling mode; For an arch with , the limit point buckling mode or the bifurcation buckling mode may occur to the arch; For an arch with , the arch buckles in a limit point buckling mode; For an arch with , the arch becomes a curved beam and does not display typical buckling behavior. Noted from Eqs 31, 35, the critical parameters are quite related to the gradient temperature change and the slenderness S/h. Thus, the variations of critical parameters , , and with the gradient temperature change is shown in Figure 7A, and with the slenderness S/h is shown in Figure 7B. It can be seen that the value of critical parameters , , and decreases with an increase of the gradient temperature change or slenderness S/h.

FIGURE 7

Conclusion

The nonlinear elastic behavior and buckling of shallow arch under gradient thermal and uniform radial loading has been studied in this paper. Exact solutions for the structural responses, internal force and critical buckling loads of the arch have been derived by adopting the principle of virtual work and mid-plane plane formulations. The effects of gradient temperature on the radial displacement, axial displacement, internal force and critical buckling loads have been discussed comprehensively. From the numerical discussion, the effects of the gradient temperature are quite significantly on the structural behavior of the arch. The arch deflects in its concave direction and buckles when a critical temperature gradient and external load are reached. It is also found that the arch under gradient thermal and uniform radial loadings can buckle in a limit point instability mode or a bifurcation mode. The critical gradient temperature change can be determined by setting the limit point load obtained from Eq. 23 to be equal to the bifurcation buckling load obtained from Eq. 29 at , from which a critical parameter that is switching the buckling mode can also be solved when a gradient temperature is given. The value of three critical parameters , , and decreases with an increase of the gradient temperature change or slenderness S/h.

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