【摘要】：針對圓弧形拱結(jié)構(gòu)和拋物形拱結(jié)構(gòu)的力學(xué)特性進(jìn)行比較研究,基于結(jié)構(gòu)力學(xué)的彈性中心法,分別得到無鉸圓弧形和無鉸拋物形拱結(jié)構(gòu)在法向均布荷載下的內(nèi)力及應(yīng)力計算式,進(jìn)而給出了不同矢跨比和厚跨比下兩種拱結(jié)構(gòu)的彎矩、軸力對比圖,認(rèn)為拋物形拱端的彎矩比圓弧形拱拱端的彎矩更集中,特別當(dāng)水平拱圈的矢跨比較大時,拋物形拱拱端外側(cè)易出現(xiàn)較大的拉應(yīng)力,并對無鉸圓弧形拱、無鉸拋物形拱抗屈曲特性進(jìn)行了比較分析,分別給出兩種無鉸拱結(jié)構(gòu)的臨界屈曲荷載解析計算式,認(rèn)為在相同矢跨比下,拋物形拱的抗屈曲性能稍優(yōu)于圓弧形拱,為工程設(shè)計人員應(yīng)用提供參考。
[Abstract]:In order to study the mechanical properties of the arc-shaped arch structure and the parabolic arch structure, the internal force and the stress calculation formula of the non-hinged circular arc and the non-hinged parabolic arch structure under the normal uniform load are respectively obtained based on the elastic center method of the structural mechanics. Furthermore, the bending moment and axial force comparison of the two arch structures with different vector-span ratio and thick-span ratio are given, and the bending moment of the parabolic arch end is considered to be more concentrated than the bending moment of the arc-shaped arch end, especially when the sagittal cross-span of the horizontal arch ring is large, the outer side of the arch end of the parabolic arch easily has a large tensile stress, The buckling characteristics of the non-hinged arch and the non-hinged parabolic arch are compared and analyzed, and the critical buckling load analysis and calculation formulas of the two non-hinged arch structures are respectively given, and the buckling performance of the parabolic arch is better than the arc-shaped arch under the same vector-span ratio. Provide reference for engineering design personnel application.
【作者單位】： 浙江省水利水電勘測設(shè)計院;
【基金】：浙江省水利水電勘測設(shè)計院科標(biāo)業(yè)項目(B1608,B1609)
【分類號】：TV31

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